31results about How to "Reduce insoluble content" patented technology

The invention discloses a high-temperature-resistant full-suspension low-damage fracturing fluid, which comprises the following components in percentage by weight: 0.3-0.5% of a low-damage thickeningagent, 0.1-0.4% of a multifunctional stabilizer, 0.1-0.3% of a regulator, 0.4-0.8% of a suspension synergist and the balance of clear water or saline water; the preparation method of the fracturing fluid comprises the following steps of: 1, adding the low-damage thickening agent, the multifunctional stabilizer and the regulator into clear water or saline water under a stirring condition, uniformlystirring, and swelling for 2 to 4 hours to obtain fracturing fluid base liquid; 2, fully mixing the fracturing fluid base liquid and the suspension synergist to form the full suspension fracturing fluid with excellent sand carrying performance and temperature resistance under the combined action of physical crosslinking and chemical crosslinking. The fracturing fluid is superstrong structure fluid formed by carrying out physical crosslinking and chemical crosslinking on acrylamide polymer and suspension synergist together, and the temperature resistance can reach 150 DEG C; the sand carryingperformance is excellent, the strong spatial structure can completely suspend a proppant, and the influence of temperature is small.

The invention relates to a lithium hexafluorophosphate purification method, and belongs to the technical field of a lithium ion battery. The lithium hexafluorophosphate purification method comprises the following steps that (1) under the protection atmosphere, an organic solvent is added into lithium hexafluorophosphate to be purified for dissolution; filtering is performed to obtain filter liquid; (2) silazane is added into the filter liquid for performing deacidification reaction; crystallization is performed to obtain crystals; drying is performed; the finished product is obtained. The purification method disclosed by the invention has the advantages that an ether solvent, a carbonic ester type solvent or acetonitrile is used as the organic solvent for purifying the lithium hexafluorophosphate crude products; insoluble substances in the lithium hexafluorophosphate are removed; then, the silazane is added to act with HF acid remained in the lithium hexafluorophosphate crude products for removing free acid; metal impurities are removed through the recrystallization process. The lithium hexafluorophosphate purification method has the advantages that the lithium hexafluorophosphate with poor quality is treated; acid and metal impurities attached at the surface or blended inside the lithium hexafluorophosphate crystals can be effectively removed; the insoluble substance content is reduced; the quality of the lithium hexafluorophosphate product is improved.

The invention belongs to the technical field of fertilizers, and in particular relates to a lignin slow-release water-soluble fertilizer and a preparation method thereof. The lignin slow-release water-soluble fertilizer is prepared by adding a strong activating agent into an organic straw liquid, lignin, lignin-degrading enzyme; when the lignin is solid lignin, the weight parts of the organic straw liquid, the solid lignin and the lignin-degrading enzyme are 60-90 parts of the organic straw liquid, 10-40 parts of the solid lignin and 1-3 parts of the lignin-degrading enzyme; when the lignin is liquid lignin, the weight parts are 10-30 parts of the organic straw liquid, 70-100 parts of the liquid lignin and 1-3 parts of the lignin-degrading enzyme. The lignin slow-release water-soluble fertilizer provided by the invention has a slow-release function and water-soluble fertilizer properties as well, environmental pollution caused by comprehensive utilization of biomass raw materials is reduced, problems that a conventional slow-release water-soluble fertilizer is high in production cost, incomplete in nutrient component, relatively poor in fertility and the like can be solved, and modern organic planting of integral water and fertilizers can be achieved.

The invention relates to a method for preparing low-iron polyaluminium sulfate by using an aluminiferous waste sulfuric acid mother liquor. The method includes the following steps: adding aluminiferous waste sulfuric acid mother liquid into a pretreatment reactor, adding a heavy metal capturing agent, and conducting filter pressing separation to obtain a reaction liquid I; mixing and reacting industrial sulfuric acid and calcium aluminate powder according to a certain proportion to obtain a reaction solution II; conducting an alkalization polymerization on the reaction liquid I and reaction liquid II under a certain temperature, adding a stabilizer, then continuing the polymerization reaction, conducting filter pressing separation and cooling to obtain a liquid low-iron polyaluminium sulfate product. The invention has the beneficial effects of easily available raw materials, simple process operation, safe and environment-friendly production, high production efficiency, extremely low content of insoluble matters in the product, extremely low iron content in the product, high added value, application to fine paper manufacturing, special requirements for water treatment, production of high-grade titanium dioxide and application as a high filler.

The invention provides a negative electrode material of a lithium battery. The material comprises 80-90 wt% of graphite, 0.5-6 wt% of a conductive agent, 0.5-6 wt% of carboxymethylcellulose lithium and 1-10 wt% of styrene-butadiene latex. When the negative electrode material is used as a negative electrode of the lithium battery, Li ions can be additionally provided for the lithium battery, the dispersing control efficiency of the lithium ions is improved, the embedding and releasing number of the lithium ions between a positive electrode and the negative electrode is improved, the lithium ionmoving route between the positive and negative electrodes is shortened, so that the conductive rate and transmission rate between the positive and negative electrodes are effectively improved, and the lithium battery which adopts the negative electrode material as the negative electrode has higher specific capacity and circulation efficiency.

The invention belongs to chemicals in the field of oil field fracturing and particularly relates to an environment-friendly polymer thickening agent for fracturing and a preparation method thereof. The thickening agent is prepared from deionized water, acrylamide, N-hydroxymethyl acrylamide, 1,4-butanediol, glycerol, octadecanol, KD AHPS, HMPS, a cross-linking inhibitor and 2-acrylamide-2-methylpropanesulfonic acid through induced polymerization. The thickening agent can be cross-linked with a special cross-linking agent, the viscosity is obviously increased, and the thickening agent has the sand-carrying capacity. A polymer aqueous solution prepared with formation water can guarantee the use effect at the concentration of 0.2-0.3%, and the problems that a polymer thickening agent is poor in temperature resistance, shear resistance and salt resistance are solved.

The invention discloses a temperature-resistant salt-resistant quick-dissolving thickening agent used for a seawater-based fracturing fluid and a preparation method thereof. The temperature-resistant salt-resistant quick-dissolving thickening agent comprises the following components in percentages by mass: 6% to 8% of acrylic acid, 5% to 6% of sodium hydroxide, 18% to 23% of acrylamide, 1% to 2% of an isolation monomer, 3% to 4% of a functional anion monomer, 3% to 5% of a functional cationic monomer, 4% to 6% of an association intermediate, and 0.4% to 0.8% of an ammonium persulfate-sodium bisulfite redox system or 0.6% to 1.0% of azobisisobutyronitrile which is used as an initiator, with the balance being deionized water. The preparation method for the temperature-resistant salt-resistant quick-dissolving thickening agent comprises the following steps: 1, synthesis of the association intermediate; 2, synthesis of a thickener colloid; and 3, colloid postprocessing. The thickening agent provided by the invention has the following advantages: salt resistance is excellent; the degree of mineralization of a solution has little influence on the rate of swelling; the viscosity-increasing capacity in seawater is strong; antibacterial stability of the solution is strong; the solution has excellent temperature resistance and shearing resistance; and the content of an insoluble substance is extremely small and can not be measured with a conventional method, so the damage of residues on reservoir strata is almost eliminated.

The invention provides a method for purifying lithium bis(oxalate)borate, comprising the following steps of: dissolving a lithium bis(oxalate)borate crude product in an aprotic solvent, carrying out molecular sieve drying, filtering, carrying out evaporative concentration, carrying out thickening crystallization or mixed solvent crystallization, and repeating the steps to obtain high-purity lithium bis(oxalate)borate. C13-NMR spectrogram of the purified lithium bis(oxalate)borate is a single peak and its peak appearance location is 158.6 ppm. B11-NMR spectrogram is a single peak and its peak appearance location is 7.37 ppm. The content of metal impurity ions is determined by ICP. Contents of iron, chromium, sodium and nickel are respectively lower than 9 ppm, 1.1 ppm, 5 ppm and 0.4 ppm. The quality of the product accords with requirements of an electrolyte for lithium ion cells, and simultaneously the product is rapidly dissolved in the electrolyte. The purification technology provided by the invention is simple and easy to operate, and is suitable for industrial batch production.

The invention discloses a preparation method of liquid dye for active ink.The preparation method comprises the following steps that firstly, dye synthetic raw stock fully stands, insoluble substances are separated out, and then filtering is conducted to obtain filter liquid; secondly, inorganic salt is added into the filter liquid obtained in the first step, filtering is conducted to obtain a filter cake, then, water is added into the filter cake, and pulping is conducted to obtain pulped liquid; thirdly, the membrane treatment technology is adopted to conduct desalination and concentration on the pulped liquid obtained in the second step, and a concentrated solution is obtained; fourthly, cosolvent, buffer salt and bactericide are added into the concentrated solution obtained in the third step, and the liquid dye for the active ink is obtained.Viscosity modifier and tension modifier can be added into the liquid dye so that the active ink can be prepared, and the prepared active ink for inkjet printing is good in stability and printing effect.

The invention relates to a straw organic liquid and particularly relates to a preparation method of the straw organic liquid specially used for crops. The preparation method includes the steps of: 1) pre-treating crop straws and separating the crop straws to obtain hemi-cellulose liquid, cellulose and lignin, wherein a less amount of waste liquid and membrane treatment supernatant are generated during the separation; 2) mixing the hemi-cellulose liquid with the waste liquid, filtering, flocculating and precipitating the mixed liquid, adding nitrogen and phosphorus and performing membrane treatment to obtain a fourth liquid phase, and performing anaerobic fermentation and vacuum pressure reduced concentration, and adding a strong activator and a plant nutritional growth promoter to produce the straw organic liquid specially used for crops. The straw organic liquid specially used for crops has comprehensive and balanced nutrients, is quick in effect and can increase germination ratio of crop seeds and seedling quality, is short in production period and is low in production cost and high in yield, can solve the problems of long production period, high production cost and low yield of a liquid fertilizer in the prior art.

The invention discloses a compound sulfadiazine suspension. The compound sulfadiazine suspension comprises sulfadiazine, trimethoprim, sodium hydroxide, a suspending aid A, a suspending aid B, a surfactant and water for injection. The preparation method comprises steps as follows: sulfadiazine and trimethoprim are ground to 400-700 nm; trimethoprim is added to the suspending aid A; the mixture is dissolved, and a first dissolved solution is obtained; the water for injection is taken and heated to 45 DEG C, sulfadiazine and the suspending aid B are added, and a second dissolved solution is obtained; the rest water for injection is taken and heated to 30 DEG C-50 DEG C, sodium hydroxide is added and dissolved, the first dissolved solution is heated to 60 DEG C-65 DEG C, the second dissolved solution is heated to 40 DEG C-50 DEG C, then the first dissolved solution and the second dissolved solution are mixed, a third dissolved solution and the surfactant are added to a batching container and uniformly stirred, and a fourth dissolved solution is obtained; the prepared fourth dissolved solution is added to a high-speed homogenizer and sheared for 10-20 minutes, and filtrate is sterilized for 30 minutes at the temperature of 100-300 DEG C and under the pressure of 0.1-0.2 Mpa. The absorptivity is improved, the acetylation rate is decreased, and few crystals are formed in urine.

The invention relates to a Gleditsia sinensis polysaccharide gum and a preparation method thereof. The preparation method of the Gleditsia sinensis polysaccharide gum comprises the following steps: preprocessing the Gleditsia sinensis seed with sulfuric acid, then shelling, drying, chipping, selecting, screening, hydrating, and grinding. The method prepares the polysaccharide gum by steps of preprocessing the Gleditsia sinensis with sulfuric acid, and separating by washing with water, chipping, and so on, the ratio of galactose to mannose in product is changed while the content of water insoluble matter in product is lowered, so that the polysaccharide gum has better gel property after being blended with xanthan gum.

The invention discloses a method for producing high-nitrogen sulfur-based water soluble compound fertilizer through slurry-spraying granulation. Phosphoric acid added to a mixed acid intermediate tank is prepared through steps as follows: firstly, phosphoric acid and ammonia gas are pre-neutralized in anammoniation reactor, and pre-neutralized slurry is obtained; after pH value of part of the pre-neutralized slurry is regulated to be 4.0-4.5, filter residues and a filtrate are obtained through filter pressing; the filter residues and the residual pre-neutralized slurry are sent to a powder ammonium workshop for production ofammonium phosphate; the filtrate is taken as phosphoric acid to be added to the mixed acid intermediate tank and mixed with potassium hydrogen sulfate from apotassium hydrogen reaction tank, and mixed acid is obtained and sent to a tubular reactor for a reaction with introduced ammonia gas. According to the method, most insoluble substances are filtered out through filter pressing, so that content of the insoluble substances in the compound fertilizer is reduced, and the compound fertilizer can meet the requirement of the water soluble fertilizer. Meanwhile, molten urea is added to an oil injection coating system, so that urea can wrap the compound fertilizer surface, the content of nitrogen in the compound fertilizer is effectively increased, and high practicability is realized.

The invention provides a purification method of lithium difluorophosphate, and the purification method comprises the following steps: S1: in an inert gas protective atmosphere, dissolving a lithium difluorophosphate crude product by using an organic solvent, removing water by using a molecular sieve, and filtering by using a precision filter to obtain a lithium difluorophosphate solution of whichthe water content is less than 5ppm and the insoluble substance content is less than 200ppm; S2, adding a deacidifying agent into the lithium difluorophosphate solution obtained in the step S1 to obtain a lithium difluorophosphate solution of which the acid value(based on HF)is lower than 10ppm; S3, recrystallizing the lithium difluorophosphate solution obtained in the step S2 to obtain lithium difluorophosphate solid particles of which the impurity metal ion content is lower than 1ppm; and S4, drying and crushing the lithium difluorophosphate obtained in the step S3 to obtain a lithium difluorophosphate particle product with extremely low contents of water, free acids, insoluble substances and metal ions. The method can effectively remove water, acids and metal impurities of lithium difluorophosphate with poor quality, reduce the content of insoluble substances and improve the product quality of the lithium difluorophosphate.

The invention belongs to the technical field of sodium carboxymethyl cellulose, and discloses a preparation method of sodium carboxymethyl cellulose, which comprises the following steps: alkalizing and etherifying natural cellulose in sequence to obtain a sodium carboxymethyl cellulose crude product, and then neutralizing, washing, stripping, drying and crushing in sequence to prepare the sodium carboxymethyl cellulose. Wherein in one or more processes of neutralization, washing, steam stripping, drying and crushing or in the sodium carboxymethyl cellulose, an accelerating solvent is added for reaction, and the prepared sodium carboxymethyl cellulose has the advantages of rapid dispersion and rapid viscosity release. The invention also discloses a battery negative electrode slurry which comprises the following components in parts by weight: 96-98 parts of graphite, 0.5-2 parts of conductive carbon ink, 0.6-2 parts of sodium carboxymethyl cellulose, 0.4-2 parts of styrene-butadiene latex and 90-150 parts of water, and the negative electrode slurry does not block a filter element in the preparation process, is free of scratches during coating and is stable in surface density.

This invention relates to an improved method for preparing solid sodium aluminate. The method comprises: (1) reacting gibbsite and liquid base to obtain a coarse solution; (2) purifying to obtain a refined solution; (3) spray-drying to obtain the final product. The product has such advantages as high quality and high adaptability of raw materials, and is suitable for mass production.

The invention discloses a solid-liquid separation type two-step reaction system for production of polyaluminum chloride. The two-step reaction system comprises a conditioning tank, a conditioning tank transfer tank, a cooling tower, a separating tank, a separated slag storing tank, a flocculating agent preparing pot and a semi-finished product tank, wherein the conditioning tank is provided with a calcium aluminate feeding inlet and a first-step liquid feeding inlet; the conditioning tank is communicated with the conditioning tank transfer tank; the outlet of the cooling tower is communicated with the separating tank; the flocculating agent preparing pot is communicated with the separating tank; the upper part of the separating tank is communicated with the semi-finished product tank; and the lower part of the semi-finished product tank is communicated with the separated slag storing tank. The two-step reaction system is characterized by further comprising a cyclone separator arranged between the conditioning tank transfer tank and the cooling tower; the conditioning tank transfer tank is connected with the liquid inlet of the cyclone separator via a conditioning liquid delivery pump; and the overflow liquid outlet of the cyclone separator is connected with the liquid inlet of the cooling tower. The system reduces the content of insoluble substances in the manner of solid-liquid separation so as to improve the output and quality of a polyaluminum chloride product.

The invention discloses a preparation method of liquid dye for active ink.The preparation method comprises the following steps that firstly, dye synthetic raw stock fully stands, insoluble substances are separated out, and then filtering is conducted to obtain filter liquid; secondly, inorganic salt is added into the filter liquid obtained in the first step, filtering is conducted to obtain a filter cake, then, water is added into the filter cake, and pulping is conducted to obtain pulped liquid; thirdly, the membrane treatment technology is adopted to conduct desalination and concentration on the pulped liquid obtained in the second step, and a concentrated solution is obtained; fourthly, cosolvent, buffer salt and bactericide are added into the concentrated solution obtained in the third step, and the liquid dye for the active ink is obtained.Viscosity modifier and tension modifier can be added into the liquid dye so that the active ink can be prepared, and the prepared active ink for inkjet printing is good in stability and printing effect.

A reaction device for producing polyaluminium chloride is disclosed. The device comprises a first-step reaction system and a second-step reaction system. The first-step reaction system comprises a reaction tank, a reaction tank transit tank, a flocculant preparation tank I, pressure filters and first-step liquid tanks. The second-step reaction system comprises a regulating tank, a regulating tank transit tank, a cooling tower, a separation tank, a separation residue storage tank, a flocculant preparation tank II and a semi-finished product tank. According to the device, insoluble substances produced in reactions are separated through coagulating sedimentation and pressure filtration, thus effectively controlling and reducing the content of the insoluble substances in the reaction liquid, increasing the yield of liquid polyaluminium chloride, improving quality of the liquid polyaluminium chloride, and allowing pressure filtration to be more sufficient and higher in efficiency.

The invention relates to a method for preparing low-iron polyaluminium sulfate by using an aluminiferous waste sulfuric acid mother liquor. The method includes the following steps: adding aluminiferous waste sulfuric acid mother liquid into a pretreatment reactor, adding a heavy metal capturing agent, and conducting filter pressing separation to obtain a reaction liquid I; mixing and reacting industrial sulfuric acid and calcium aluminate powder according to a certain proportion to obtain a reaction solution II; conducting an alkalization polymerization on the reaction liquid I and reaction liquid II under a certain temperature, adding a stabilizer, then continuing the polymerization reaction, conducting filter pressing separation and cooling to obtain a liquid low-iron polyaluminium sulfate product. The invention has the beneficial effects of easily available raw materials, simple process operation, safe and environment-friendly production, high production efficiency, extremely low content of insoluble matters in the product, extremely low iron content in the product, high added value, application to fine paper manufacturing, special requirements for water treatment, production of high-grade titanium dioxide and application as a high filler.

The invention discloses a method for preparing Spatholobus granule. The preparation method comprises the steps of preparing materials, preboiling, pulverizing, homogenizing, spray drying and granulating. The preparation method of the invention forms a complete set of granulating process, and the insoluble matter content in the obtained caulis Sargentodoxae granules is low, the administration is convenient, and the deficiency of the traditional caulis Sargentodoxae granules production technology is overcome.

The invention relates to a secondary mixing method of an epoxy resin composition for semiconductor encapsulation. The present invention is to prepare epoxy resin, phenolic resin curing agent, inorganic filler, release agent, low stress modifier, coloring agent, flame retardant, silane coupling agent and Put the inorganic ion scavenger into a high-speed mixer, after stirring evenly, melt and knead at a temperature of 70-100°C, press into tablets after kneading, cool, and pulverize into powder; then mix the obtained powder with a solidification accelerator in a high-speed mixer After stirring evenly in the medium, carry out secondary melting and kneading at a temperature of 70-100° C., after kneading, tablet, cool, and pulverize to obtain an epoxy resin composition for semiconductor encapsulation. The invention adopts the secondary mixing method to obtain the epoxy resin composition for semiconductor encapsulation with good fluidity, low insoluble matter content, excellent encapsulation moldability, reduced leak seal ratio and improved mold opening hardness.

The invention provides a preparation method and application of licorice extract, and relates to the technical field of extraction of effective components. Comprising the following steps: (1) raw material pretreatment: crushing a dried licorice raw material, adding an organic solvent and a surfactant, soaking, filtering, and reserving filter residues for later use; (2) extraction: performing water extraction on the filter residues obtained in the step (1), then filtering, discarding the filter residues, and retaining filtrate; and (3) concentrating the filtrate obtained in the step (2) into paste, and then drying to obtain the licorice extract. In the pretreatment step, licorice powder is soaked in an organic solvent and surfactant soaking mode, the solubility of ineffective components with different dissolving properties in the organic solvent is increased, and then the content of effective components in licorice extract is increased; and the content of insoluble substances in water and the total gray level of the obtained extract are obviously reduced.

This invention relates to an improved method for preparing solid sodium aluminate. The method comprises: (1) reacting gibbsite and liquid base to obtain a coarse solution; (2) purifying to obtain a refined solution; (3) spray-drying to obtain the final product. The product has such advantages as high quality and high adaptability of raw materials, and is suitable for mass production.

The invention relates to the field of marine lubricating oil, and discloses an engine oil reinforcer which comprises 0.5-5 wt% of dialkyl secondary amine, 0.5-10 wt% of alkylamine, 0.5-10 wt% of alkyl hydramine, 5-10 wt% of antiwear additive and 65-93.5 wt% of base oil. When being used in marine medium-speed engine oil, the reinforcer can obviously lower the insoluble impurities in old oil, can disperse the carbon deposits, oil sludge and other solid matters, can lower the in-use oleic acid value to prevent rust, and is capable of reinforcing the alkali number of old oil, effectively prolonging the service time of in-use oil and saving the oil cost, thereby bringing in great economic benefits.

The invention discloses a preparation method of a polyimide film, which is characterized in that an ionic liquid with low decomposition temperature is added into a reaction system solvent as a cosolvent, and the content of the ionic liquid accounts for 3-90% of the total content of the solvent. By selecting the ionic liquid with proper decomposition temperature between 180 DEG C and 300 DEG C and utilizing high polarization energy of the ionic liquid, high solubility of an intermediate and a product polyimide is realized, and the obtained polyimide is high in molecular weight, low in content of gel and other insoluble substances, few in film defect, good in film forming flowability and high in mechanical property. It is guaranteed that the ionic liquid is stable and not decomposed in the thermal imidization process, the thermal imidization process is stable and controllable, the imidization degree is high, and side reactions are few. The ionic liquid promotes molecular motion ability and crystallization and reduces internal stress of the film.

The invention discloses a preparation method of Daxueteng granules. The preparation method includes the steps of material preparation, precooking, pulverization, homogenization, spray drying and granulation. The preparation method of the invention forms a complete set of granulation process, and obtains The content of insoluble matter in the Daxueteng granules is low, and it is convenient to take, which overcomes the shortcomings of the traditional production technology of Daxueteng granules.