46results about How to "Reduce competitive adsorption" patented technology

The invention discloses a method for detecting fatty acid content in rice fat. The method comprises the following steps of: carrying out base-catalysis methyl esterification and solid phase microextraction synchronously on a rice sample in a headspace bottle by means of a multifunctional sample injector, and then detecting and performing quantitative analysis on the fatty acid content in the rice fat after the rice sample enters a gas chromatography-tandem mass spectrum (GC-MS-MS). According to the invention, the on-line methyl esterification, the solid-phase microextraction and the gas chromatography-tandem mass spectrum technology are adopted, the five steps of methyl esterification, extraction, enrichment, sampling and detection are completed at the same time during one process, the operation is simple, and the consumed time is short; moreover, water acts as a base body during the methyl esterification reaction, so that the competitive adsorption of an extracting head to methyl alcohol and volatile substances is lowered, and the extraction and pre-enrichment of fatty acid methyl ester by the solid phase microextraction are improved effectively; and the minimum detection limit of fatty acid is 0.001-0.049 micro g / L, and is obviously lower than the minimum detection limit, 4.0mg / L, of an internal standard method which is used for performing quantitative determination on oil fatty acid.

The invention discloses a method for recycling hydrogenation catalyst waste. The method comprises the following steps: (1) alumina support waste and / or the hydrogenation catalyst waste are / is smashedand sieved, powder obtained after sieving is pulped, slurry with solid content being 15wt%-55wt% is obtained, a nitric acid-phosphoric acid-organic acid mixed solution is added with stirring, the obtained solution is heated to 65-100 DEG C, kept at the temperature for 30-90 min and cooled to room temperature, then organic amine is added, the solution is mixed uniformly, and sol slurry of the wasteis obtained; (2) the sol slurry of the waste in step (1), alumina powder and an extrusion aid are mixed uniformly, then mixed kneading, forming, drying and roasting are performed, and an alumina support is obtained; (3) an active component is supported on the alumina support, and a hydrogenation catalyst is obtained. With adoption of the method, the hydrogenation catalyst waste can be recycled effectively, wastewater and waste residues are not produced, pollution to the environment is avoided, and the catalyst prepared with the method has higher catalytic activity.

The invention provides a preparation method of a hydrogenation catalyst. According to the method, a part of active metal components and an organic complexing agent are introduced in a carrier moldingprocess, a carrier is molded through a certain calcining treatment procedure, and then a subsequent active metal soaking step is performed to obtain the hydrogenation catalyst. According to the hydrogenation catalyst prepared with the method provided by the invention, active metals are dispersed uniformly; the preparation method is simple and feasible, and is particularly suitable for an ultra-deep hydrodesulfurization reaction of diesel oil.

The invention relates to an oil gas adsorption-condensation treatment device capable of defrosting without shutdown and an oil gas recycling method. The oil gas adsorption-condensation treatment device comprises a pair of adsorption towers, a first-grade heat exchanger, a second-grade heat exchanger, a third-grade heat exchanger and a vacuum pump, wherein a condensation system for oil gas condensation and separation is formed by the first-grade heat exchanger, the second-grade heat exchanger and the third-grade heat exchanger; oil gas is pre-condensed so that water vapor and part of hydrocarbons in the oil gas are condensed firstly; then the oil gas enters hydrophilic silica gel filling layers in the adsorption towers through inlet pipelines at the bottoms of the adsorption towers and an oil gas mixture to be recycled is further subjected to drying treatment; then the oil gas mixture is subjected to adsorption recycling through active carbon filling layers at the upper parts of the adsorption towers; high-concentration oil gas which is desorbed by the adsorption towers in vacuum enters the condensation system again through a regeneration pipeline and then is subjected to condensation recycling; all the heat exchangers of the condensation system are coupled together and a condensation / defrosting mode of a condenser is carried out at the same time, so that the aims of running thecondensation system without the shutdown and improving the working efficiency are realized.

The invention discloses a system and a method for deeply treating sewage and recycling resin regeneration waste liquid. The system comprises a biochemical pool, a settling pond, a powder activated carbon membrane biological reactor, a resin tank, a waste liquid collecting pool, a denitrification pool, a nitration pool and a sludge concentration pool. The method is characterized in that the incoming water of a sewage treatment plant is pre-treated and then enters the biochemical pool, thus the CODcr can be degraded under the effect of activated sludge; supernate flows into the powder activatedcarbon membrane biological reactor after settling, and thus pollutants can be further adsorbed through the powder activated carbon; chroma, suspension substances and CODcr are removed by interceptingthrough a membrane assembly; the water drained by the membrane is fed into the resin tank, and nitrate in the sewage can be removed under the adsorption effect of special nitrate ion exchange resin, and the clean water is directly drained; the resin regeneration waste liquid flows into the waste liquid collecting pool and is then fed into the denitrification pool for denitrification; the water subjected to denitrification flows into the nitration pool for nitration, thus ammonia nitrogen can be reduced, and CODcr can be degraded; the liquid subjected to nitration flows back to the denitrification pool; and the water drained by the nitration pool flows back to the biochemical pool at the front end, thus realizing the recycling of the resin regeneration waste liquid.

The invention discloses a carbon dioxide absorbent for fruit and vegetable storage and transportation, and a preparation method thereof, and belongs to the field of storage and transportation fresh-keeping of picked fruits and vegetables. The preparation method of the carbon dioxide absorbent comprises the following steps: introducing a specific type of organosilane to tetramethoxysilane which is a precuros step by step in order to synthesizes a hydrophobically-modified and amino area functionalized modified mesoporous silica support material, and loading organic amine on the pores and the surface of the support material to obtain the carbon dioxide absorbent. The absorbent which has strong hydrophobicity can significantly alleviate and eliminate the competitive adsorption of water vapor to carbon dioxide and the adverse effect on the adsorption stability in the high humidity environment of the fruit and vegetable storage and transportation, and the functional modification structure design of the amino area is used to highly disperse -NH2 in the outer layer of the material to realize easy contact with carbon dioxide in order to effectively improve the absorption capacity of carbon dioxide. The carbon dioxide absorbent has the advantages of strong absorption ability, long acting period, high adsorption selectivity, good use safety, high efficiency, greenness, and meeting the actual production demands of fruits and vegetables.

The invention provides a method for removing zero-valent mercury and arsenic hydride through cooperation of magnetic field and photocatalytic oxidation. According to the method, a magnetic field generator is arranged on a gas-solid photocatalysis device, gas containing the zero-valent mercury and the arsenic hydride is treated in the presence of a magnetic field, illumination and a catalyst, and by utilizing the magnetic difference of the gas and the influence of the magnetic field on the catalyst, arsenic hydride and zero-valent mercury are catalytically oxidized by the catalyst, so that thepurpose of improving the photocatalytic efficiency is achieved, and the removal of the zero-valent mercury and the arsenic hydride and the collection and utilization of CO raw material gas are achieved; an external magnetic field and light are combined to generate a coupling effect, combination of photo-induced electrons and holes is inhibited, the existence time and the yield of hydroxyl radicalson the surface of the catalyst and the oxidation efficiency of oxygen are improved, so that the catalytic oxidation arsenic and mercury removal efficiency of the catalyst is improved, and the methodis simple, easy to implement, low in cost, low in energy consumption and capable of achieving resource utilization of waste gas.

The invention relates to a preparing method and product of a hydrophobic sulfur-resistant low-temperature denitration catalyst, and belongs to the technical field of denitration catalysts. In the method, by adding a hydrophobic modifier, introducing hydrophobic groups into the catalyst and changing the hydrophobicity of the surface of the catalyst, the vapor in smoke can be less adsorbed to the surface of the catalyst in the use process, and the competitive adsorption between the vapor and NH3 is reduced; in addition, with a TiO2-SiO2 compound as the carrier, the SO2 oxidization rate can be reduced, the deposition of ammonium sulfate salt on the surface of the catalyst or in pores is reduced, the denitration rate of the catalyst can be ensured, and the service life of the catalyst can be prolonged. In addition, a template agent is added in the preparing process, mesopores of the catalyst are increased, the specific surface area and pore volume of the catalyst are improved, the catalystcan contain more ammonium sulfate salt, the toxin inactivation rate of the ammonium sulfate salt is reduced, and the catalyst can be better applied industrially. The catalyst is simple in preparing process, not high in device requirement and suitable for industrial production.

The invention provides an indoor VOCs purification material for a high humidity environment and a preparation method thereof. The preparation method comprises: preparing high porosity and adsorption effect phenolic aerogel, preparing a silver-doped nano-titanium dioxide photocatalyst, and producing hydrophobic ring crosslinked polyphosphazene microspheres through a polymerization reaction of hexachlorocyclotriphosphazene and bisphenol AF, wherein during the microsphere formation, the photocatalyst is uniformly dispersed on the surface of the aerogel to obtain the indoor VOCs purification material for a high humidity environment. Compared with the conventional purification material, the indoor VOCs purification material can reduce the competitive adsorption of water molecules and VOCs by supporting the photocatalyst on the superhydrophobic surface, and can improve the adsorption amount and adsorption rate of VOCs, can improve photocatalytic degradation efficiency of VOCs and is especially suitable for the adsorption and degradation of indoor VOCs in a high humidity environment.

The invention belongs to the technical field of uranium conversion, and particularly relates to a processing method of tail gas leacheate produced by UF6. The processing method includes steps of selecting waste water generated from tail gas spraying process of the UF6 technique as a processing object; preparing 15-20% of sodium hydroxide solution by mass for neutralizing bicarbonate radical ion in the technical waste water, and making it transform to be carbanion, and reducing the competitive absorption of HCO3- to the metal uranium; adding the prepared sodium hydroxide solution in the technical waste water tank, and stirring the solution evenly by pressure air; pumping the prepared alkali uranium-bearing liquid waste to the filter by a centrifugal pump driven by magnetic force to filter and remove suspended particle impurities; pressing the waste liquid to an ion exchange pillar by compression air to absorb; filling strong basicity anion exchange resin to the ion exchange pillar; after the absorption and saturation of the ion exchange resin, using the mixed solution of 2 mol / L sodium chloride and 5% of sodium carbonate as desorption agent to desorb the ion exchange resin; settling the desorption liquid by solid sodium hydroxide, and recycling the metal uranium therein.

The invention discloses an ultra-deep desulfurization and dearomatization method for diesel oil. The method comprises the following steps that under a hydrogenation reaction condition, raw oil sequentially passes through a region I, a region II, a region III and a region IV filled with a hydrogenation catalyst in a reactor from top to bottom, and is subjected to a hydrogenation reaction with the catalyst in each region and hydrogen from bottom to top, and a hydrogenation reaction product flows out from the bottom of the reactor, wherein the reaction temperatures of the region I, the region IIand the region III are gradually increased, and the reaction temperature of the region IV is 51-100 DEG C lower than the reaction temperature of the region III. According to the method, different catalysts are reasonably graded, process parameters corresponding to the catalysts are adjusted, and the method is used for the hydrogenation reaction of diesel oil and can meet the requirements for producing low-sulfur and low-aromatic hydrocarbon diesel oil.

The invention belongs to the technical field of medicines, and relates to the new technology for extracting Chinese magnoliavine fruit lignanoid with high efficiency. A preparation process comprises the following steps of: crushing Chinese magnoliavine fruit, adding 60 to 100 percent of methanol or ethanol and 0.5 to 5 percent of surfactant, performing reflux extracting for 1 to 2 times, and mixing extract, wherein the reflux extracting is performed for 1 to 2 hours every time; concentrating the extract under reduced pressure, removing the methanol or the ethanol, adding ester organic solvent for extracting; and concentrating an extract phase to recover the ester organic solvent, dissolving in proper amount of water, and purifying by adopting adsorbent resin, and eluting by 30 to 90 percent of ethanol to obtain the Chinese magnoliavine fruit lignanoid with 70 to 98 percent of lignanoid. The new technology has the characteristics that: after the surfactant is added, the extraction efficiency can be improved by over 30 percent, the extracting time can be reduced, clarified solution can be obtained, and an upper absorption column is not blocked due to ester insoluble substances; and by adding the ester organic solvent, pigment impurities can be removed effectively, the competitive adsorption of pigment on the absorption column can be reduced, and the purity of final products can be improved.

The invention discloses a preparation method of a molecular sieve adsorbent for gas desulfurization, which comprises the following steps: respectively carrying out certain pretreatment on ZSM-5, SAPO-11 and other molecular sieves according to different characteristics, uniformly mixing with a pore-enlarging agent and a binder, carrying out extrusion molding, drying and roasting to obtain the finished product desulfurization adsorbent. The desulfurization adsorbent has the characteristics of high sulfur capacity and good stability, and can be suitable for desulfurization of various types of gases.

The invention relates to an adsorbent for adsorption of VOCs and a preparation method of the adsorbent. The preparation method includes the steps that a silicon source, an aluminum source and a template are mixed at a set proportion and self-pressed and crystallized under the set temperature and the set pressure, and a first adsorbent precursor for the VOCs is produced; the first adsorbent precursor for the VOCs is washed, ion-exchanged and then roasted, and a second adsorbent precursor for the VOCs is obtained; and the obtained second adsorbent precursor for the VOCs is mixed with aluminum oxide, the mixture is mixed with water, extruded and dried and roasted, and the adsorption for the VOCs is obtained. The adsorbent for the VOCs synthesized from cheap raw materials has the advantages ofthe good hydrothermal stability, the high crystallinity degree, the large surface area and the moderate pore diameter, and is suitable for adsorption of gas of the VOCs.

The invention discloses a SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst and preparation method and application thereof. In the SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst, the absorption energy of a SO2 oxide on Pt is changed by a catalyst metal core modification surface layer Pt electron structure, the competitive absorption with active oxygen-containing particle is reduced, and active sites can be timely released. With the SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst disclosed by the invention, the toxicity-resistant performance of the catalyst is improved on the basis that the oxygen-reduction activity is not reduced; and compared with commercial Pt / C, the catalyst prepared by the invention has the advantagesthat the SO2 toxicity-resistant performance is obviously improved, and the commercial development of a fuel cell is favorably promoted.

The invention provides a production method of clean diesel. According to the characteristics that the content of nitrogen is different along with the distribution of the distillation range in the petroleum distillate, the diesel raw material is divided into a heavy component and a light component, wherein the content of nitrogen in the heavy component accounts for 5-20% of the weight of the total content of nitrogen in the diesel raw materials; the heavy component is mixed with the light component and then enters the hydrogenation unit after the adsorption unit removes the nitrogen-containing compound, and clean diesel is obtained after hydrogenation treatment. In the invention, only part of the distillate is adsorbed, thus reducing the investment of the adsorption unit and the loss of oils; in addition, the content of nitrogen in the hydrogenation raw material is reduced, thus reducing the competitive adsorption with sulfide, lowering operating severity of the hydrogenation unit and prolonging the service life of catalyst.

The invention relates to a stabilizing agent for repairing arsenic-polluted soil by using urban solid wastes. The stabilizing agent comprises, by weight, 100 parts of quicklime, 10-50 parts of fly ashand 30-80 parts of red brick powder. After adsorption, complexation and precipitation are carried out, the heavy metal pollution of the soil can be obviously reduced, and related environmental protection standards are met. The preparation raw materials of the repairing agent adopt construction wastes and industrial wastes, so the source is wide, the cost is low, a preparation method of the repairing agent is simple, and is convenient to operate, and certain environmentally-friendly effect of waste treatment is achieved.

The invention provides a preparation method of a hydrogenation catalyst. This method introduces some active metal components and organic acid complexing agents during the carrier forming process, shapes the carrier through a certain roasting process, and then performs subsequent active metal impregnation steps to obtain a hydrogenation catalyst. The hydrogenation catalyst prepared by the method of the present invention has active metals uniformly dispersed and the preparation method is simple and easy to implement, and is especially suitable for ultra-deep hydrodesulfurization reactions of diesel fuel.

The invention relates to a compound containing multielement alkamines, and a preparation method and application thereof as a concrete corrosion inhibitor. When being used as a concrete corrosion inhibitor, the compound containing multielement alkamines can enhance the adsorptive capacity for iron atoms, prevent the corrosion inhibitor from volatilization and loss, and enhance the corrosion resistance. The structural formula of the compound containing multielement alkamines is disclosed as (I), wherein R1 is H, R2 is -(CH2CH2NH)mH or -(CH2)nNH2, and m and n are respectively a whole number ranging from 2 to 6; or R1 and R2 are respectively one of -CH3, -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3, -CH(CH3)2, -CH2CH(CH3)2, -CH(CH2)5(cyclohexyl) or -C(CH3)2CH2CH3. The compound containing multielement alkamines is prepared by reacting epoxide and organic amine under the action of a catalyst.

The invention discloses an efficient arsenic removal agent and a preparation method thereof, and belongs to the technical field of arsenic removal purification, the arsenic removal agent is composed of a 13x molecular sieve and a TS-1 titanium silicalite molecular sieve as a carrier I, an IVB group element as a carrier II, a VIII group fourth period element as a main agent I, VIII group fifth and sixth period elements as main agents II, and a lanthanide element as an auxiliary agent. The efficient arsenic removal agent provided by the invention has the advantages of high arsenic capacity, high arsenic removal precision, good stability and long service life, and can be used for purification in the fields of natural gas, synthesis gas, flue gas, coal gas, blast furnace gas, coke oven gas, light gas-liquid hydrocarbon, ethylene-rich gas and the like.

The invention relates to a high-calcium-magnesium high-argillaceous zinc carbonate flotation recovery method which comprises the following steps: (1) desliming flotation: taking lead-zinc sulfide flotation tailings as raw ores, adding a slime collecting agent, stirring and reacting for 3-6 minutes, and then desliming before zinc oxide flotation to respectively obtain slime-containing ore pulp and deslimed tailing ore pulp; (2) roughing zinc oxide: adding regulators of sodium carbonate, sodium sulfide, gangue inhibitor, lauryl amine acetate and butyl xanthate into the deslimed tailing pulp for roughing zinc to respectively obtain zinc rough concentrate pulp and roughed tailing pulp; (3) zinc oxide concentration: performing concentration operation on the zinc rough concentrate pulp twice to obtain zinc oxide concentrate; and (4) zinc oxide scavenging: performing one-time zinc oxide scavenging operation on the roughing tailing pulp to obtain zinc oxide scavenged tailings. According to the method, the floatability of the zinc oxide mineral can be remarkably enhanced, and better mineral separation technical indexes are obtained.

The invention belongs to the technical field of medicines, and relates to the new technology for extracting Chinese magnoliavine fruit lignanoid. A preparation process comprises the following steps of: crushing Chinese magnoliavine fruit, adding 60 to 100 percent of methanol or ethanol and 0.5 to 5 percent of surfactant, performing reflux extracting for 1 to 2 times, and mixing extract, wherein the reflux extracting is performed for 1 to 2 hours every time; concentrating the extract under reduced pressure, removing the methanol or the ethanol, adding ester organic solvent for extracting; and concentrating an extract phase to recover the ester organic solvent, dissolving in proper amount of water, and purifying by adopting adsorbent resin, and eluting by 30 to 90 percent of ethanol to obtain the Chinese magnoliavine fruit lignanoid with 70 to 98 percent of lignanoid. The new technology has the characteristics that: after the surfactant is added, the extraction efficiency can be improved by over 30 percent, the extracting time can be reduced, clarified solution can be obtained, and an upper absorption column is not blocked due to ester insoluble substances; and by adding the ester organic solvent, pigment impurities can be removed effectively, the competitive adsorption of pigment on the absorption column can be reduced, and the purity of final products can be improved.

The invention discloses a cement water-reducing and a preparation method thereof, and belongs to the field of chemical engineering. The cement water-reducing agent is characterized in that octenyl succinic acid starch ester and ethyecellulose are used as raw materials, and welangum is embedded; octenyl succinic acid starch ester is high in emulsifying performance and emulsifying stability and forms a viscoelastic film under the mutual effect of macromolecules, thus realizing the emulsifying effect; and the welangum is high in mobility, and the slow releasing and water holding effects of the welangum are achieved; welangum is generally used as an outstanding thickening agent or a segregation resisting agent. According to the water-reducing agent, a carboxylic acid group in the molecular structure of the component of the water-reducing agent is of electronegativity type and can be attached to the surfaces, with positive charge, of cement particles, so that the cement particles can be dispersed, and as a result, the mobility of cement slurry is improved; and the problems that a current water-reducing agent is absorbed by mud in a cement concrete aggregate, and the water reducing capacity and the dispersing capacity of the water-reducing agent highly decrease as the mud content increases, and the slump loss resisting effect is low can be solved.

The invention belongs to the technical field of uranium conversion, and particularly relates to a processing method of tail gas leacheate produced by UF6. The processing method includes steps of selecting waste water generated from tail gas spraying process of the UF6 technique as a processing object; preparing 15-20% of sodium hydroxide solution by mass for neutralizing bicarbonate radical ion in the technical waste water, and making it transform to be carbanion, and reducing the competitive absorption of HCO3- to the metal uranium; adding the prepared sodium hydroxide solution in the technical waste water tank, and stirring the solution evenly by pressure air; pumping the prepared alkali uranium-bearing liquid waste to the filter by a centrifugal pump driven by magnetic force to filter and remove suspended particle impurities; pressing the waste liquid to an ion exchange pillar by compression air to absorb; filling strong basicity anion exchange resin to the ion exchange pillar; after the absorption and saturation of the ion exchange resin, using the mixed solution of 2 mol / L sodium chloride and 5% of sodium carbonate as desorption agent to desorb the ion exchange resin; settling the desorption liquid by solid sodium hydroxide, and recycling the metal uranium therein.

The invention provides a mud-resistant polycarboxylate-type water reducing agent. According to the invention, the molecular structure of the water reducing agent contains amide groups, so competitiveadsorption of clay to the polycarboxylate-type water reducing agent can be effectively reduced, the adsorption amount of the polycarboxylate-type water reducing agent is increased, and the dispersioneffect of the polycarboxylate-type water reducing agent on cement particles is facilitated; and as the molecular structure of the water reducing agent has a short polyoxyethylene side chain, the intercalation adsorption effect of the clay on the polycarboxylate-type water reducing agent can be effectively reduced, and the water reducing efficiency of the polycarboxylate-type water reducing agent is improved. The preparation method of the mud-resistant polycarboxylate-type water reducing agent provided by the invention is wide in raw material source, low in cost, simple in production process operation, easy to control, safe and environment-friendly, and does not use an organic solvent.