176 results about "MONOCHLOROACETIC ACID" patented technology

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 a modified elm bark flocculant. The preparation method comprises the following steps: drying elm bark, grinding, and screening through a 50-mesh screen to get elm bark fine powder; and further using 85% alcohol to moisten, then adding strong base, performing alkalization at the temperature of 30-50 DEG C for 0.5-2.5 hours, then adding monochloroacetic acid, performing etherification at the temperature of 40-70 DEG C for 0.5-3 hours, further adding ammonium ceric nitrate and acrylamide, performing polymerization at the temperature of 50-70 DEG Cfor 1-3 hours to prepare an elm bark flocculant crude product, finally performing reduced pressure distillation and recovering the alcohol to get the modified elm bark flocculant, wherein the weight ratio of elm bark fine powder to alcohol to strong base to monochloroacetic acid to ammonium ceric nitrate to acrylamide is 1:(0.5-2.5):(0.5-5):(0.1-1):(0.001-0.0001):(0.1-1). The flocculant is low inproduction cost and biodegradable, and can prevent secondary pollution of an environment; compared with a like product, the using amount is low, and the flocculant is suitable for various types of water quality and particularly suitable for treatment of domestic sewage with high mud content, landfill leachate, back purge effluent and mud discharged from various sedimentation tanks.

The invention discloses a new synthesis method of a polyaniline/carboxylated graphene composite material and belongs to the technical field of composite materials. Firstly, functional modification is conducted on the surface of graphite oxide through NaOH and monochloroacetic acid to convert an epoxy group, a hydroxide group and other oxygen-containing groups on the surface of graphite oxide into carboxyl groups; secondly, graphite oxide is wrapped by a surfactant, and then the carboxyl groups are grafted onto the edge of graphite oxide together with diazonium salt, and carboxylated graphene is obtained; lastly, the carboxylated graphene and an aniline monomer are polymerized, and the polyaniline/carboxylated graphene composite material is prepared. According to the composite material, polyaniline is loaded on the surface of graphene and connected with graphene under the action of a covalent bond; the composite material has a large specific surface area, a novel structure and good electrochemical properties, mechanical properties and chemical stability, and can be used for preparing a supercapacitor, a selective absorbent for specific ions, a catalyst and the like.

The invention provides a preparation method of sodium carboxymethylcellulose. The sodium carboxymethylcellulose is prepared from wood pulp or paper pulp through a semidry method without use of an organic solvent, and the preparation method comprises the steps of alkaline reaction: carrying out alkaline reaction on sodium hydroxide by taking water as a medium to obtain alkali cellulose; etherification reaction: implementing etherification reaction on alkali cellulose and monochloro acetic acid to obtain a crude sodium carboxymethylcellulose product; neutralization and washing: neutralizing the crude sodium carboxymethylcellulose product in an aqueous solution of alcohol and washing in alcohol; and drying treatment: drying, grinding and sieving obtained solid material to obtain sodium carboxymethylcellulose. The method disclosed by the invention has the advantages that raw materials are abundant, waste paper pulp is used as raw material and little water in the sodium hydroxide solution serves as a reaction medium in a preparation process; the preparation cost is low because of no use of organic solvents; and the product performances are controllable. The method disclosed by the invention can finish the entire preparation process in a grinder, so as to realize efficient utilization of equipment.

The invention relates to a preparation method for low-viscosity sodium carboxymethyl cellulose for foodstuff. Under the conditions of proper temperature and stirring, refined gossypin which is cut into pieces and ethanol solution of sodium hydroxide are basified in a kneader to form soda cellulose; under the conditions of proper temperature and stirring, ethanol solution of monochloroacetic acid is added for etherification reaction, hydrochloric acid solution is dripped to neutralize residual sodium hydroxide in the system, and reaction material is rinsed by two steps by ethanol and aqueous hydrogen peroxide solution; and finally, the sodium carboxymethyl cellulose can be obtained after the steps of separation, drying and pulverization are accomplished. The preparation method has the advantages of simplicity, low cost, high yield and convenient operation, the prepared sodium carboxymethyl cellulose is white or yellowish powder, the viscosity is low and ranges from 22 to 50Mpa.s, and the purity is high and is no less than 99.0 percent; and the product has favorable acid resistance, can be widely applied to various foodstuff and beverages to be used as emulsified and suspended rotproof and fresh-keeping stabilizing agent to play the role of thickening, and can obviously improve the mouthfeel of the foodstuff.

The invention discloses arginine-chitosan with high degree of substitution, a preparation method and an application thereof, belonging to the field of biomedical material. The arginine-chitosan with high degree of substitution takes monochloroacetic acid as 'molecular arm', to ensure that arginine is efficiently and covalently bound on the free amino group or the free hydroxyl group of chitosan, and the electropositivity of the chitosan is obviously increased, therefore the antibiosis performance is enhanced. The material is derived from shells and shellfishes of arthropods, such as shrimps, crabs and insects, shells and gristles of mollusk, and cell walls of the cells of lower plant, fungus and alga. The arginine-chitosan with high degree of substitution has the advantages that the material preparation process is simple, and the material sources are rich. The property of the clinical burn and scald prevention susceptible fungus--staphylococcus aureus of the arginine-chitosan with high degree of substitution is better than that of unmodified chitosan, and is enhanced with the increase of the degree of substitution of arginine.

The present invention describes a process for the manufacture of substantially pure monochloroacetic acid from a liquid chloroacetic acid mixture comprising monochloroacetic acid and dichloroacetic acid, in particular in an amount of 2 to 40 percent by weight, wherein said mixture, further mixed with a suspended hydrogenation catalyst, is mixed with hydrogen gas and the resulting mixture is brought to reaction in a reactor, which is characterized in that the reactor is a loop reactor comprising a gas and liquid recirculation system coupled via an ejector mixing nozzle, in which reactor the gas and liquid are circulated in co-current flow, and the mixing intensity introduced to the liquid phase is at least 50 W/l of liquid phase.

An aqueous composition for oral care application comprising solution of an amidobetaine of the following general Formula I is disclosed;

in which R is an alkyl of coconut fatty acids, preferably hydrogenated coconut fatty acids, or a fatty acid mixture group which, on the average, corresponds to coconut fatty acids, wherein the solution has a solids content of 36% by weight, a pH of 4.5 to 6, an alkylamidopropyldimethyl amine content of not more than 0.1% by weight, and a free fatty acid content less than 0.5% by weight, sodium chloride content of 6.0% max and dimethylaminopropylamino betaine (from N,N-dimethyl amino propyl 1,3-diamine (DMAPA) and monochloroacetic acid) content of 30 ppm max, free sodium monochloroacetic acid content of 5 ppm max and free N,N-dimethylamino propyl 1,3-diamine content of 5.0 ppm max.

The invention relates to a preparation method of carboxymethyl chitosan, and particularly relates to a preparation method of the carboxymethyl chitosan with a semi-dry grinding method. The preparation method includes the steps of: 1) adding sodium hydroxide to chitosan and fully grinding the components to uniformly mix the components, adding distilled water and uniformly mixing and grinding the components for 2-3 h, and allowing the mixture to stand for 12-18 h for alkalization; 2) adding monochloroacetic acid to the alkalized chitosan, uniformly grinding and mixing the components, wherein the molar ratio of the chitosan, the sodium hydroxide to the monochloroacetic acid is 1:3.5-5.5:3; and 3) dropwisely adding distilled water and meanwhile grinding the mixture for 4-6 h to prepare a carboxymethyl chitosan initial product, washing the carboxymethyl chitosan initial product with an organic solution, and performing suction filtration and drying to prepare the carboxymethyl chitosan. The preparation method has simple operations, wherein only is a less amount of water employed as a reaction medium, so that a large use amount of organic solvent is avoided. The method is low in production cost and environment pollution and is high in synthesis efficiency and productivity.

The invention discloses a hydrodechlorination method for producing high-purity monochloro acetic acid. The Hydrodechlorination method comprises the following steps: 1, filling a fixed bed reactor with a catalyst bed; 2, uniformly mixing hydrogen and a reaction mixed solution in a gas-liquid mixer, and injecting the obtained mixture into a heat exchanger to be pre-heated so as to obtain a reaction raw material; 3, discharging air in the fixed bed reactor by the nitrogen gas pump-in method, then discharging nitrogen gas in the fixed bed reactor by the hydrogen pump-in method, and injecting the reaction raw material into the fixed bed reactor for hydrodechlorination reaction so as to obtain an intermediate product; 4, performing distillation separation on the intermediate product to obtain monochloro acetic acid with the quality purity not less than 99.5%. The method continually and selectively conducts catalytic hydrogenation to remove dichloroacetic acid in the reaction mixed solution, inhibits formation of a by-product (acetic acid) in the intermediate product to be within an acceptable range, and reduces the mass content of dichloroacetic acid in the obtained by-products to be 0.5% or below.

The invention discloses a preparation method of a carboxymethylated bagasse xylan derivative, which comprises the following steps: feeding bagasse xylan, monochloroacetic acid and sodium hydroxide according to a proportion, mixing the bagasse xylan and a solvent well, taking half of the solution into a reactor after the sodium hydroxide is dissolved in the solvent, controlling the reaction pH to be 9-12, and making reaction last for 1-2 hour(s) at a temperature of 25-45 DEG C; adding a metallocene catalyst, respectively adding the monochloroacetic acid after being dissolved in the solvent and the residual sodium hydroxide solution into the reaction system, controlling the reaction pH to be 9-12, and making reaction last for 2-5 hours at a temperature of 45-75 DEG C; dropping dilute acid, mixing the solution, adjusting the pH of the reaction system to be neutral, and vacuum-filtering to obtain a rough product under hot conditions; washing the rough product with ethanol water until no Cl- is left in the rough product, washing the product with acetone for dehydration, placing the product after dehydration into a vacuum drying cabinet, drying the product for 12 hours at a temperature below 60 DEG C, and naturally cooling the product. The invention has the advantages of simple process control and high utilization rate of raw materials. The prepared carboxymethylated bagasse xylan has good water solubility, thermal stability and surface activity.

The invention relates to an iron-heavy metal nano particle/PVDF hybrid membrane and a preparation method thereof, which belongs to the field of polymer science and technology. The method comprises the steps of dispersing the PVDF powder and polyacrylic acid (PAA) microgel into N,N- dimethylformamide (DMF), and preparing a PVDF flat base membrane by adopting a phase inversion method; soaking the PVDF base membrane in an aqueous solution containing FeCl2 to react for a given time, then soaking the PVDF base membrane in an aqueous solution containing sodium borohydride to prepare a hybrid membrane containing FeO nano particles, and then soaking the hybrid membrane in an absolute ethyl alcohol aqueous solution containing heavy metal salt to prepare a hybrid membrane containing heavy metal-iron nano particles. The hybrid membrane can be used for degrading chlorinated organic compounds such as monochloroacetic acid, chlorophenesic acid, trichloro ethylene, tetrachlormethane and polychlorinated biphenyl and has high catalytic reaction activity. The preparation method is simple and easy to control, the cost is low, and the method is applicable to the mass production.

The invention discloses a method for producing composite liquid mulching films from straw. The method includes processing the crop straw to obtain cellulose solution, adding monochloro acetic acid, potassium persulfate and butyl acrylate into the cellulose solution and carrying out etherification and cross-linking reaction on celluloses at the temperature of 70 DEG C under stirring conditions to obtain cellulose cross-linked liquor; adding natural polymer chitosan-gelatin blend solution with synergistic effects and capability of improving the plasticity and the flexibility into the cellulose cross-linked liquor. The monochloro acetic acid is used as an etherifying agent, the potassium persulfate is used as an initiator, and the butyl acrylate is used as a cross-linking agent. The method has the advantages that the chitosan-gelatin blend solution is bipolar poly-electrolyte formed by means of coordination cross-linking reaction and is excellent in film-forming property and film-forming strength; certain quantities of trace fertilizers, herbicides and insecticides are added into components to obtain the composite liquid mulching films made from the straw, the composite liquid mulching films not only can be used for agricultural water-saving production, but also can be used for dune fixation afforestation and saline and alkaline land transformation and improvement and are low in cost, and waste can be turned into wealth.

The invention discloses a preparing method of sodium starch carboxymethyl oxide based on sweet potato starch, wherein the oxidant is 30% hydrogen peroxide; the alkalizer is sodium hydroxide; the etherifying agent is monochloroacetic acid; the solvent is anhydrous alcohol; these reactions are proceeded in the same reactor simultaneously.

This invention relates to a method for producing chloroacetic acid by the reaction of glacial acetic acid with the chlorine gas under the effect of the compound catalyst, followed by continuous feeding, continuous distillation and continuous chlorination catalytic reaction. Wherein: load weighted acetic acid in the chlorination reactor, and use it as standard substance, cool the cryostat to the set temperature and turn on the pump for circulation, the temperature controller controls the reactor heating temperature between 100 and 105Deg C, sequentially add 3-8% major catalyst ethyl anhydride, assistant catalyst concentrated sulfuric acid 0.8%, start the venting of the chlorine gas and start timing; then cool down the temperature using condenser low-temperature bath, the residue gas is absorbed by water and concentrated alkaline solution respectively and then discharged, timinly sample for analysis, so as to produce the chloroacetic acid with more than 99% content. This invention is characterized of mild reaction condition, high catalyst activity, specific catalyst effect, high product selectivity, 'clean' process, easy separation and environmental friendly.

The invention relates to a hybrid membrane capable of degrading organic chloride and a preparation method of the hybrid memrbane, belonging to the scientific and technical field of polymers. The preparation method comprises the steps of dispersing polyvinylidene fluoride powder, polyacrylic acid microgel or microspheres in N,N-dimethylfomamide, and preparing a flat base membrane by adopting a phase inversion method; then soaking the base membrane in an aqueous solution containing FeCl2 to react for a certain period of time, then soaking the base membrane in an aqueous solution containing sodium borohydride to prepare a hybrid membrane containing Fe<0> nanoparticles, and then soaking the hybrid membrane in an anhydrous ethanol solution containing noble metal salt to prepare a hybrid membrane capable of degrading organic chloride and containing iron-noble metal nanoparticles. The hybrid membrane can degrade chlorinated organic compounds including monochloroacetic acid, chlorophenesic acid, trichloroethylene, tetrachlormethane, polychlorinated biphenyl and the like, and has the advantages of high catalytic reaction activity, convenience in operation, good reuse effect and the like. Besides, the hybrid membrane also has the advantages of simple preparation method, low cost, suitability for large-scale production and the like.

The invention discloses a method for detecting monochloroacetic acid, dichloroacetic acid, trichloroacetic acid and sulfate radical in chloroacetic acid by ion chromatography, which comprises the following steps: preparing a mixed standard solution of four anions including monochloroacetic acid, dichloroacetic acid, trichloroacetic acid and sulfate radical, feeding the mixed standard solution intoan ion chromatography detection system to perform gradient leaching by using an AS19-HC analytical column and KOH leacheate, thus obtaining a linear equation of concentration and peak area, and calculating the contents of all components in chloroacetic acid through the linear equation. The invention has the advantages that the whole analysis process is simple and convenient, the pollution and loss is smaller, the blank and marked sample recovery rate is 96 to 99.75 percent and the method is suitable for content detection of monochloroacetic acid, dichloroacetic acid, trichloroacetic acid andsulfate radical in chloroacetic acid.

The use of—olive-oil—derived compounds as surfactants is described, wherein such olive-oil-derived compounds are obtained by olive oil transesterification. Preferably, such compounds are a mixture-composed of an emollient and of anionic surfactants. As an emollient a product obtained via transesterification of olive oil with glycerine derivatives is preferably used most preferably olive oil PEG-7 esters, whereas the anionic surfactant is obtained from the emollient by causing it to react with monochloroacetic acid most preferably Na PEG-7 olive oil Carboxylate.

The invention relates to a PVDF (Polyvinylidene Fluoride)/Fe-Pd bi-metal nanoparticle hybrid membrane and a preparation method thereof. The preparation method comprises the steps of blending polymer microspheres and PVDF to prepare a membrane, and then, loading ferrum-palladium bi-metal nanoparticles to prepare the hybrid membrane with favorable catalytic reaction activity and separation performance. By using the PVDF/Fe-Pd bi-metal nanoparticle hybrid membrane, chlorine-contained organisms such as trichloro ethylene, monochloroacetic acid, dichlorinated biphenyl, dichlorphenoxyacetic acid and the like can be subjected to reductive dechlorination reaction, and chlorine atoms in the chlorine-contained organisms are converted into hydrogen atoms. In addition, the membrane can also be used for the catalytic reduction reaction of nitro in nitrobenzene molecules such as aminonitrobenzene, nitrobenzene, methylnitrobenzene and the like so as to convert the nitro into an amino group.

The invention discloses a preparation method of sodium carboxymethyl starch with hyperviscosity, which uses the pre-mixture of urea and aldehyde, to process etherification between starch and chloroacetic acid, to obtain sodium carboxymethyl starch at 72000mPa. s (2%, 25DEG C) viscosity. The inventive sodium carboxymethyl starch has high viscosity, wide application, simple preparation, low cost, and industrialization production support.

The present invention relates to raspberry seed oil derivatives derived by the reaction of dimethyl amino propyl amine and cold pressed raspberry seed oil. This intermediate is subsequently reacted with sodium monochloroacetic acid to make a raspberry betaine. The choice of cold pressed raspberry seed oil as a raw material in the preparation of the compounds of the present invention is critical, since it has been found that the cold pressed raspberry seed oil contains antioxidants, antimicrobial compounds and which when reacted with a DMAPA result in products that deliver said actives to the skin and hair, resulting in protection of the skin and hair from environmental factors such as acid rain, ozone attack and UV degradation.