1612 results about "Chloroacetic acid" patented technology

The invention relates to cationic asphalt emulsifier and preparation method and application thereof. The main agent of the cationic asphalt emulsifier is prepared through the reaction of quaternarization reagent and intermediate at molar ratio of 0.5-3:1, wherein the intermediate is produced in the reaction of organic acid mixture and organic amine at molar ratio of 1: 1-3. The adjuvant agent of the cationic asphalt emulsifier is the combination of, based on the main agent by weight, 0.1-2.5% of nonionic surfactant and 0.1-2.5% of modifier. The organic acid mixture is the mixture of linear, branched or naphthene-containing organic acid with small relative pace steric effect and organic acid with big relative space steric effect at molar ratio of 1: 3- 3: 1. The quaternarization reagent is epichlorohydrin, hydrochloric acid, chloromethane, dimethyl sulfate or chloroacetic acid. The modifier is one or more of aluminum sulfate, ammonium chloride and calcium chloride and the nonionic surfactant is fatty alcohol-polyoxyethylene ether. The emulsifier has no bad effects to the property of the asphalt, has wide application range and can satisfy different construction conditions.

The invention discloses carboxymethyl cellulose of wheat straw. The wheat straw is crushed and subjected to pretreatment with dilute alkali, bleaching and alkalization, and then reacts with chloroacetic acid before being etherified so as to obtain the carboxymethyl cellulose of the wheat straw; and the carboxymethyl cellulose of the wheat straw is subjected to graft copolymerization together with acrylic acid to obtain a carboxymethyl cellulose-based polymer adsorbent. The adsorbent is applied to the treatment of wastewater containing heavy metal ions, has high adsorbability and large adsorption capacity and ensures high metal ion removal rate. After treatment, the adsorbent has high stability and can completely meet the requirements of heavy-metal wastewater treatment; and the treated wastewater is clear and transparent without odor and can meet the national emission standard. The invention has the advantage that the resources of raw materials are wide, the cost is low, the use of waste is realized, and secondary pollution caused by burning of the wheat straw is avoided, thus being conducive to environmental protection.

The present invention provides a etherifying luffa method and an application in the metal ion adsorption, belonging to natural high polymer material modification or wastewater disposal technical field. The method is mixing the natural luffa with m moderate NaOH alcohol solution, alkalization under the temperature 25-80 Celsius degree, or alkalization by microwave interval radiation, then obtaining alkalization luffa by reflowing, washing, filtering, drying in the thermostatic waterbath; the etherifying luffa is obtained by dispersing with NaOH solution, reacting with the chloroacetic acid alcoholic solution, filtering, washing, drying. The luffa comes from variety of natural resources, and biodegradation, and treating process is relatively simple, partly substituting high molecular synthetic material in aspect of the sewage treatment, and having advantages such as friendly to the environment.

The invention relates to a preparation method of a grafting amphoteric chitosan flocculant, comprising the following steps: carrying out graft copolymerization between carboxymethyl chitosan and polyacrylamide to obtain the grafting amphoteric chitosan flocculant, wherein the substituted ratio of a carboxyl group is 5%-90%, and the mass of the polyacrylamide is 40%-80% of the grafting amphoteric chitosan flocculant. The carboxymethyl chitosan can be obtained by separation after carboxylation reaction between chitosan and chloroacetic acid. The chitosan can adopt various commercially available products, and preferably, molecular weight of the chitosan is not less than 50,000, more preferably 750,000-850,000. The carboxymethyl chitosan grafting polyacrylamide flocculant prepared by the method of the invention improves water solubility of the chitosan, is applicable to treating water with different electric charges, and has good salt tolerance; and the flocculant can be also widely applied to an acid medium and an alkaline medium, and has wide adaptability to the pH value range.

An antibacterial medical dressing for the operation wound is prepared from chitosan fibers through alkalizing to become alkaline chitosan fibers, and etherifying reaction on chloroacetic acid to become carboxymethyl chitosan fibers. When said fibers are encountered with water, it is swelling to become elastic gel. It is possible to add additive for higher curative effect.

The invention discloses a barium-strontium-calcium descaling and blockage removing agent for a near-well area and a preparing method of the barium-strontium-calcium descaling and blockage removing agent. The barium-strontium-calcium descaling and blockage removing agent comprises a polyamine carboxylate solution, nonionic surfactant accounting for 3%-10% of the total mass of the polyamine carboxylate solution and an emulsion breaker accounting for 2%-8% of the total mass of the polyamine carboxylate solution. The polyamine carboxylate solution is prepared from polyamine midbody and chloroacetic acid salt through a reaction, wherein the polyamine midbody is prepared through organic amine and epoxy chloropropane with the mole ratio of 1.05-1.5:1 through a reaction, and the chloroacetic acid salt is prepared from chloroacetic acid and alkali with the same mole ratio through a reaction. The barium-strontium-calcium descaling and blockage removing agent for the near-well area has a good removing effect on indissolvable salt such as barium sulfate, strontium sulfate and calcium sulfate, and the descaling rate is higher than 40%. Meanwhile, the barium-strontium-calcium descaling and blockage removing agent has the expansion preventing and inhibiting performance, the clay expansion reducing rate is higher than 80%, corrosion to equipment is slight, and water locking can be avoided. Blockage removing can be effectively achieved on a reservoir stratum near a well, the permeability of the reservoir stratum is improved, and thus the recovery ratio of oil and gas resources is increased.

The invention relates to preparation of a surfactant of double long chain alkyl lycine and applications thereof, belonging to the field of colloid and interface chemistry. The surfactant is prepared by reaction of double long-chain alkyl methyl tertiary amine and chloroactic acid and is an ampholytic surfactant t and the number of carbon atoms of the long-chain alkyl is 8 to 18. By being used by combination with other surface active agents, the surfactant is used as an alkali-free oil-displacing agent; wherein the molar fraction of the surface active agent of double-long chain alkyl lycine is 0.10 to 0.60, and can reduce the interfacial tension of Daqing crude oil/formation water interface to 10mN/m order of magnitude under the conditions that the total mass concentration of the active surface agent is 0.01 percent to 0.5 percent, 1000ppm of polyacrylamide is added, alkali is not added and the temperature is 45 DEG C.

The invention relates to a preparation method and application of an amphoteric chelate sorbent containing agricultural straw. The sorbent is brownish-yellow solid powder, the nitrogen content is 10.83wt%, and the specific surface area is 12.93m<2>/g. The sorbent is prepared by taking agricultural straw, epoxy chloropropane and monochloroacetic acid as raw materials, taking trimethylamine or triethylamine as a grafting reaction agent and taking ethylenediamine, diethylenetriamine or triethylenetetramine as a cross-linking agent. The method of the invention has the advantages of simple production processes, economy, practicability, reproducibility and the like and can be suitable for large-scale production. The sorbent prepared by the invention has the characteristics of good stability, good adsorption effect, wide application range and the like, can be widely applied to treatment of waste water containing heavy metal ions, and has better treatment effect.

A method for removing calcium, iron, other metals, and amines from crude oil in a refinery desalting process includes the steps of adding a wash water to the crude oil; adding the wash water to the crude oil to create an emulsion; adding to the wash water, the crude oil or the emulsion an acid additive consisting of at least one of the following: oxalic acid, citric acid, water-soluble hydroxyacid selected from the group consisting of glycolic acid, gluconic acid, C.sub.2-C.sub.4 alpha-hydroxy acids, malic acid, lactic acid, poly-hydroxy carboxylic acids, thioglycolic acid, chloroacetic acid, polymeric forms of the above hydroxyacids, poly-glycolic esters, glycolate ethers, and ammonium salt and alkali metal salts of these hydroxyacids, and mixtures thereof; heating at least one of the crude oil, the wash water or the emulsion to a desired temperature; resolving the emulsion containing the acid additive into a hydrocarbon phase and an aqueous phase using electrostatic coalescence, the metals and amines being transferred to the aqueous phase; measuring at least one desalting process characteristic at at least one process point; performing a statistical calculation of the desalting process performance based upon the measuring; and adjusting a control setting of the desalting process as a function of the statistical calculation. Other methods and devices are also provided.

The invention relates to a moisture absorbing humectant of polysaccharides and a preparation method, belonging to the fields of daily chemicals and medical industry; wherein, carboxymethyl hyaluronic acid is adopted for the moisture absorbing humectant; the preparation method comprises steps as follows: 1 to 5-hour reaction is carried out for the hyaluronic acid swollen in alkaline isopropyl alcohol solution and the chloroacetic acid with a molar mass ratio between 1 to 6 and 1 to 4 in the excessive alkaline isopropyl alcohol solution under temperatures between 35 and 75 DEG centigrade, and then pumping filtration and drying are carried out to acquire the moisture absorbing humectant. With the carboxymethyl hyaluronic acid acquired through effective synthesis, the production cost hardly increases, while the moisture absorption and maintaining performance is remarkably improved, so as to enhance the activity and indirectly reduce the production cost. By adopting the carboxymethyl hyaluronic acid with better moisture absorption and maintaining performance than that of the hyaluronic acid as the moisture absorbing humectant, the preparation method for moisture absorbing humectant of polysaccharides has the advantages of low cost and high yielding.

The invention discloses an inhibiting agent for separating a copper-molybdenum mineral and a preparation method thereof. The preparation method comprises the following steps of: taking aminoacetic acid or alanine, ethyl isothiocyanate, triethylamine, water and acetone according to a molar ratio of 1-2:1-2:3-4:4-6:3-5, and mixing the aminoacetic acid or alanine, the ethyl isothiocyanate, the triethylamine, the water and the acetone, heating the mixture at the temperature of between 60 and 80 DEG C to perform reaction for 2 to 3 hours; reducing the temperature to distill off 60 to 80 percent of the triethylamine and the acetone; cooling the mixture at the normal temperature; adding 10 to 15 ml of saturated monochloroacetic acid solution into the remainder to react for 1.5 to 2 hours with stirring; and cooling to crystallize the mixture to obtain a white solid namely the inhibiting agent of a copper mineral. The inhibiting agent has high inhibiting effect on the copper mineral in a copper-molybdenum collective concentrate to reduce the content of the copper mineral in a molybdenum concentrate and improve the grade of the molybdenum concentrate. The inhibiting agent has a small used amount, and is nontoxic and pollution-free.

The invention relates to a preparation method of flurbiprofen axetil. The method comprises the following steps of: preparing 4-bromine-2-fluoroanili from fluoroaniline under the action of 1,3- dibromo-5,5-dimethyl hydantoin; condensing 4-bromine-2-fluoroanili with benzene under the action of a catalyst and sodium nitrite to synthesize 4-bromine-2-fluorobiphenyl; carrying out grignard reaction and acidity reaction on the 4-bromine-2-fluorobiphenyl and 2-bromine sodium propionate under the action of a catalyst to generate 2-(2- fluorine-4-biphenylyl) propionic acid; condensing the 2-(2- fluorine-4-biphenylyl) propionic acid with 1-chloroacetic ethyl acetate to generate a target compound flurbiprofen axetil; and carrying out molecular distillation on the flurbiprofen axetil crude product to obtain a flurbiprofen axetil final product.

The invention relates to a method for synthesizing a phenoxyacetic acid derivative. The method comprises the steps of mixing a salt compound of phenol or methyl phenol and a salt compound of chloroacetic acid, putting the mixture in a solvent to carry out a heating reaction, acidifying with an inorganic acid to obtain phenoxyacetic acid, dissolving the phenoxyacetic acid in a solvent, adding a catalyst to the solvent, passing chlorine in the solvent and carrying out a heating chlorination, cooling and crystallizing to obtain a chlorinated phenoxyacetic acid derivative or a methyl phenoxyacetic acid derivative. Compared with a conventional method, the method provided by the invention can recycle the solvent of the reaction system and wastewater for cycle use during the reaction process, can meet self-production balance and realize recycle and reuse of a sealed system, and has a yield higher than 95%, a content larger than 98%, the recycle and reuse utilization rate of the solvent higher than 95% and emission reduction of the waste water in the whole production process higher than 95%.

The invention discloses a method for treating wastewater from the preparation of glycine by the chloroacetic acid ammonolysis process, comprising the following steps: throwing waste liquid into a multi-effect falling film vacuum evaporation system, preheating the waste liquid in the multi-effect falling film vacuum evaporation system, heating and evaporating the waste liquid with a multi-effect falling film evaporator, putting the waste liquid in a flashing pot, concentrating the waste liquid until achieving the ammonium chloride concentration of 35-45%, crystallizing the concentrated solution with a crystallizer at normal temperature, drying and packaging the crystalline solid, adjusting the pH value of condensate which is generated by the multi-effect falling film vacuum evaporation system to 10-11 with NaOH, stripping the condensate in a stripping tower, absorbing methanol and ammonia which are generated from stripping with water, adjusting the pH value of primary stripping solution to 2-4 with dilute sulfuric acid, catalyzing and oxidizing the primary stripping solution with Fenton reagent at 30-40 DEG C, adjusting the pH value of the catalyzed and oxidized primary stripping solution to 10-11 with dilute sulfuric acid, throwing the primary stripping solution into the stripping tower, stripping the primary stripping solution for the second time in the stripping tower, absorbing methanol and ammonia which are generated from the primary stripping solution stripping with water, and discharging secondary stripping solution.

This invention provides a method for preparing carboxymethyl cellulose with ultrahigh substituent degree. The method comprises: (1) treating cotton and lignocellulose with 18-50% NaOH aqueous solution; (2) adding chloroacetate, chloroacetic acid or its sodium salt, and etherifying under stirring in an organic solvent under inert gas protection; (3) adding an alkali, heating for second etherification, neutralizing, washing and drying to obtain carboxymethyl cellulose with carboxymethyl mol substituent degree not lower than 2.0.