1207 results about "Chloroacetic acids" 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.

It has been discovered that metals and / or amines can be removed or transferred from a hydrocarbon phase to a water phase in an emulsion breaking process by using a composition that contains water-soluble hydroxyacids. Suitable water-soluble hydroxyacids include, but are not necessarily limited to glycolic acid, gluconic acid, C2-C4 alpha-hydroxy acids, 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. The composition may also include at least one mineral acid to reduce the pH of the desalter wash water. A solvent may be optionally included in the composition. The invention permits transfer of metals and / or amines into the aqueous phase with little or no hydrocarbon phase undercarry into the aqueous phase. The composition is particularly useful in treating crude oil emulsions, and in removing calcium and other metals therefrom.

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 present invention's modifying method for wood elements includes a step for soaking wood elements in one or a mixture of acetic anhydride, acetic acid, or chloroacetic acid; and a step for acetylating the impregnated wood elements in a gaseous phase. This method makes it possible to reduce the time required for the step of acetylating the wood elements, simplifies the process, reduces fabrication costs, and enables fabrication of a wood fiberboard having high dimensional stability.

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 present invention discloses a method for the preparation of an anti-microbial wound dressing comprises alkalizing chitosan fiber to obtain alkalized chitosan fiber which is then etherified with chloroacetic acid to produce carboxymethyl chitosan fiber. Said fiber is made into dressing by fiber opening, web formation and needling. Alternatively chitosan fiber can be made into chitosan non-woven fabric by non-woven technique first which is then carboxylmethylated. The fabric is then made into wound dressing by cutting, packaging and sterilizing. The present invention also discloses the uses of the anti-microbial wound dressing made according to said method. The dressing according to the present invention can be applied in surgical wound, burn, and other chronic wound. Said dressing, when covering wound, is able to prevent moisture losses in body fluid, provide a favorable moist environment necessary for wound healing and maintain a fluid-free, maceration-free, germ-free wound surface. Said dressing is antiphlogistic, hemostatic and antalgic and promotes wound healing.

The invention provides a chelate resin and a production method and the application thereof, and the novel chelate resin can effectively remove impurities in trichlorosilane; the preparation method provided by the invention comprises the following steps: (1) zinc chloride is used as catalyzer, a white ball and chloromethyl ether are reacted to obtain chloromethylate white ball; (2) the chloromethylate white ball and hexamine are reacted, and then concentrated hydrochloric acid-ethanol mixing solution is used for decomposing, so as to obtain primary amine resin; (3) the primary amine resin is added in the chloroacetic acid aqueous solution, and the reaction is carried out for 10-30 hours at 55-70 DEG C to obtain the chelate resin; the chelate resin can effectively remove the metal impurities such as boron, phosphorus, calcium, magnesium, copper, ferrum and other impurities in trichlorosilane, the removal rate can reach more than 99 percent; the chelate resin has high processing capacity with 200t per cube and is the optimal choice for improving the product quality.

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 present invention discloses one kind of polyurethane base biological immobile carrier. The carrier has three kinds of structures: macroporous polyurethane network; polyurethane cross-linked chitosan and coated active carbon; and microporous network formed with chitosan and cross-linked glutaraldehyde, chloropropylene oxide or chloroacetic acid. These three kinds of network interpenetrate to form the polymer capable of fixing bioactive molecule. The carrier of the present invention has the features of coexisting macropores and micropores, coexisting hydrophilicity and reaction property, coexisting powerful adsorption and strong polarity, high biological bearing capacity, good compatibility, high physical, chemical and mechanical performance, etc., and is suitable for various bioreactors for treating sewage.

The invention discloses a carboxymethyl pachyman (CMP) with high-degree of substitution and making method and application, which is characterized by the following: adopting water or water alcohol solution as dielectric; proceeding substitution reaction for pachyman, chloroacetic acid and fitful excessive sodium hydroxide to obtain CMP without vibrating technique and equipment; improving CMP D / S and solubility to reach injection need.

The invention discloses an acrylic chelating fiber for removing heavy metal ions in water and the preparation method, belonging to chelating fiber technology. The chelating fiber adopts acrylic fiber as matrix, and the matrix loads poly (carboxymethyl) amino functional group by means of covalent bond. The preparation method of the acrylic chelating fiber comprises the following steps: enabling amination reaction of the acrylic fiber and polyamine or polyamine water solution; enabling carboxy methylation reaction with the alkali-bearing chloroacetic acid water solution after washing and drying, so as to obtain the acrylic chelating fiber with poly (carboxymethyl) amino functional group. The acrylic chelating fiber has the advantages of wide and excellent performance for complexing heavy metal ions, high complex capacity and high complex speed of metal ion, simple preparation and low cost.

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.

A method for removing calcium, iron, other metals, and amines from crude oil in a refinery desalting process includes the steps of: running a plurality of tests to determine at least one statistically significant processing characteristic of the refinery desalting process; 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; resolving the emulsion containing the acid additive into a hydrocarbon phase and an aqueous phase; and adjusting a control setting of the processing characteristic as a function of the tests.

The present invention discloses a preparation method of glycine. In the preparation method, chloroacetic acid and ammonia are used as raw materials; urotropine is used as the catalyst of the reaction; low-carbon alcohol solvent is used as a reaction medium; organic amine is added into the reaction system to be used as an acid binding agent; after the reaction is completed, the glycine with high content can be prepared through filtration. The preparation method solves the problems of the solvent that can not be recycled, serious solvent consumption, high cost, low yield, serious three-waste pollution and so on in the prior art. And the preparation method is suitable for the industrial production of the glycine.

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.

The present invention relates to a food sodium carboxymethylcellulose preparation method, which includes: principally adding a mixed cellulosic material composed of 100 parts of wood pulp and purified cotton with a mixing ratio of 0.25-1.5:1, ethanol solvent and sodium hydroxide aqueous solution into a kneader, performing quaternization for 50-100 minutes under the mixing condition of 20-40 EDG C, and then respectively slowly adding chloroacetic acid ethanol solution and sodium hydrate aqueous solution, and performing etherifying response for 40-100 minutes under the mixing condition of 75-80 EDG C, and then cooling down for discharging; preparing sodium carboxymethylcellulose by using acetic acid to neutralize the obtained material, and simultaneously using ethanol aqueous solution for washing twice, adding aqueous hydrogen peroxide solution once or twice at the same time of washing and the other steps. The preparation method has simple method, low-cost, high yield, convenient operation; its products have lower viscosity, low prices, and widely application in various types of food and drinks as a stabilizer of emulsion and suspension, playing a thickening role.

Reactive phosphorus species can be removed or transferred from a hydrocarbon phase to a water phase in an emulsion breaking process by using a composition that contains water-soluble hydroxyacids. Suitable water-soluble hydroxy-acids include, but are not necessarily limited to glycolic acid, gluconic acid, C2-C4 alpha-hydroxy acids, 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. The composition may optionally include a mineral acid to reduce the pH of the desalter wash water. A solvent may be optionally included in the composition. The invention permits transfer of reactive phosphorus species into the aqueous phase with little or no hydrocarbon phase undercarry into the aqueous phase. The composition is particularly useful in treating crude oil emulsions, and in removing calcium and other metals therefrom.

The present invention discloses a method for synthesizing glycocyamine and salt thereof. The method for synthesizing glycocyamine salt comprises the following steps: 1) carrying out neutralization reaction on guanidine hydrochloride and an alkaline matter C for obtaining solution A; 2) facilitating chloroacetic acid to react with alkaline solution for obtaining solution B; and 3) facilitating the solution A to react with the solution B for generating glycocyamine salt. The alkaline matter C can be sodium hydroxide or sodium carbonate. Preferably the mass ratio of sodium hydroxide:guanidine hydrochloride:chloroacetic acid is 200:480:460. Preferably the mass ratio of sodium carbonate:guanidine hydrochloride:chloroacetic acid is 265:480:460. Preferably the reacting temperature of step 3) is 40 DEG C. The holding time of reaction is no less than 24 hours. The synthesis of glycocyamine refers to that the solution of step 1) directly reacts with the chloroacetic acid. The method used by the invention has the advantages of simple synthetic process, convenient operation, higher yield, less byproducts and convenient separation and purification. The product purity of the compound of the invention can be higher than 98%.

The invention relates to an industrialized production process of active carboxymethylpachymaran. Firstly, carrying out superfine grinding on the tuckahoe sclerotium to obtain tuckahoe superfine powder; extracting the superfine powder with edible alcohol at normal temperature, filtering to obtain filter cakes; taking the mixture of water and alcohol as a medium, wherein the volume ratio of alcohol to water is 15-10:1; and carrying out reaction between the filter cakes, chloroacetic acid and excessive sodium hydroxide to obtain the carboxymethylpachymaran with anti-tumor activity. The carboxymethylpachymaran obtained by the invention has high purity, favorable water solubility, moderate molecular weight, moderate substitution degree of carboxymethyl and obvious anti-tumor activity. The active carboxymethylpachymaran can be applied to preparing antitumor drugs or health foods. The preparation route of the invention is economic and environment-friendly, and is suitable for large-scale industrialized production.

The invention relates to a reversible emulsifier and a preparation method thereof, and an environment-friendly reversible emulsifying drilling liquid and application. The reversible emulsifier is prepared from the following raw materials: initial raw materials: C10-C20 alkyl primary amine, C10-C20 alkyl sulfonic acid, perfluorooctane sulfonate and chloroacetic acid; additives: isopropanol, peregal O-15, and peregal O-8. The environment-friendly reversible emulsifying drilling liquid is prepared by the following steps of stirring an oil phase, the reversible emulsifier and a water phase at high speed, adding alcohols with carbon number less than 4, straight-chain alcohols with carbon number of 8 to 14, quaternary ammonium salt-modified organobentonite, humic acid filtrate loss reducer, calcium oxide and choline chloride, and then adding weighing material, so as to reach the required density of the drilling liquid. The invention also provides a phase transfer method of the reversible emulsifying drilling liquid. The phase transfer method has the advantages that according to production requirements, the phases of the drilling liquid can be conveniently transferred, and the drilling liquid is stable under the two states of W / O (water / oil), and O / W (oil / water), and can be repeatedly used.

The invention relates to the technical field of hyaluronic acid, and in particular relates to a method for reducing viscosity of hyaluronic acid. The method comprises the following steps of: adding hyaluronic acid into an alkaline organic solvent; adding chloroacetic acid, reacting at the temperature of 30 to 70 DEG C; and performing post-treatment on the reaction solution to obtain low-viscosity hyaluronic acid. According to the method, HA is modified, and carboxymethyl groups are added into the structure, so that HA is modified on the basis that the original property is kept, the viscosity is reduced, and the dissolubility of HA in the aqueous solution is improved, so that the dissolution of HA is fast, HA is convenient to use, hyaluronic acid is conveniently used in cosmetics or foods, the application range of HA is widened, and the using amount of HA is improved.

The invention discloses a reinforced modification method for applying fly ash fiber to a paper making process, and preparation and application methods of a polyacrylic acid amide modifier for paper making. The reinforced modification method is characterized by comprising the following steps of: performing carboxylation modification on polyvinyl alcohol in a reactor, adding polyvinyl alcohol and deionized water into the reactor, heating to fully dissolve the polyvinyl alcohol, adding chloroacetic acid into the reactor, adding alkali to adjust the pH of the solution to be between 10 and 13, and adding acid 4 to 6 hours later to adjust the pH of the solution to be between 1 and 4 so as to obtain a polyvinyl alcohol solution of which the molecular chain is provided with a carboxyl group; and dispersing the fly ash fiber into water, adding gamma-aminopropyltriethoxysilane for pulping for 5 to 10 minutes, adding the carboxylation modified polyvinyl alcohol solution, adding wood fiber stuff, mixing the stuff uniformly, and making paper on a sheet forming machine so as to obtain finished paper sheets formed by mixing the fly ash fiber with wood fiber. After the method is used for modifying the fly ash fiber, the intensity of fly ash fiber finished paper sheets can be enhanced.

The invention provides a method for producing potassium carboxymethylcellulose by a kneading method, which comprises the following steps of: alkalizing cellulose by high-concentration potassium hydroxide liquid and industrial potassium hydroxide solid to generate alkali cellulose; after the generated alkali cellulose is subjected to carboxymethylation of chloroacetic acid, adding the potassium hydroxide liquid and the industrial potassium hydroxide solid again to carry out secondary alkalization; then adding chloroacetic acid to carry out secondary carboxymethylation treatment; and washing, neutralizing, centrifuging, drying and grinding to obtain the potassium carboxymethylcellulose product. The product not only has good dissolubility, but also has simple production process, short reaction period, low equipment investment and low raw material consumption.

The invention provides a clean production process of glycine. An organic mixed solvent is used for producing glycine and a by-product ammonium chloride by combined production. The organic mixed solvent comprises methanol, ethanol, and dihydric alcohol solvents or dihydric alcohol derivative solvents. The mixed solvent is added into a glycine synthesis reactor, urotropine and chloroacetic acid are added, ammonia is added, and a mixed crystal solid of glycine and ammonium chloride is obtained. The mixed crystal solid is added into a mixed solvent for separation, the mixed solvent for separation is heated to 60-80 DEG C, after glycine crystal is filtered, the mixed solvent for separation is cooled to 0-20 DEG C, and an ammonium chloride solid is separated by centrifugation.

The invention relates to a new technology for clean production of chitosan and carboxymethyl chitosan by using crustacean shell raw materials. The method comprises the following steps: crushing shrimp shells, crab shells and other crustacean shell raw materials, directly reacting in an alcohol, alkali and water mixed system without calcium or protein removal, washing, and filtering to obtain calcium carbonate-containing crude chitosan for direct use; or directly adding chloroacetic acid, carrying out a chitosan carboxymethylation one-pot boiling reaction, washing a solid obtained after the reaction, filtering, drying to obtain a crude carboxymethyl chitosan and calcium carbonate mixture for direct use, or adding water to dissolve the mixture to obtain separated calcium carbonate which can be used a filler and a solution which can be used as a product directly or after concentration drying, and carrying out alcohol precipitation to obtain pure carboxymethyl chitosan. The above crude or pure product can be widely used in the fields of papermaking, binders, coatings and sustained and controlled release fertilizers. A washed filtrate contains amino acids and small peptides, and can be used as an animal amino acid fertilizer raw material or plant amino acid fertilizer or microbial nitrogen source nutriment after solvent concentration recovery.