182 results about "Dichloroacetic acid" patented technology

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.

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 relates to a microetching and roughening liquid for a copper surface. The microetching and roughening liquid comprises the following components by mass concentration: 5-50 g/L bivalent copper ions from a copper ion source, 20-150 g/L organic acid, 3-105 g/L chloride ions from a chloride ion source, a 0.0005-2 g/L water-soluble polymer and a 0.001-10 g/L pyridine derivative; a solventis water; the organic acid is at least one of formic acid, acetic acid, malic acid, citric acid, tartaric acid, edetic acid, iminodisuccinic acid, monochloro acetic acid, dichloroacetic acid and trichloroacetic acid; and the water-soluble polymer is a polymer of which a molecular chain contains a Imidazole or ammonium salt structure. The microetching and roughening liquid can form uniform roughening on the copper surface, is not affected by the crystal structure of the copper surface, and in the follow-up processes, can effectively increase the adhesive force of a solder-resist coating with which the copper surface is coated.

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.

This invention relates to a process for the preparation of 5-amino-1-phenyl-3-cyano-4-trifluoromethyl sulphinyl pyrazoles as defined by Formula-I,

wherein: R1=trifluoromethyl or trifluoromethoxy, and R2, R3=individually hydrogen, chlorine or bromine, the process comprising the step of oxidizing a compound of Formula-II,

wherein: R1=trifluoromethyl or trifluoromethoxy, and R2, R3=individually hydrogen, chlorine or bromine, in a medium comprising at least one oxidizing agent and trichloro acetic acid, and/or the reactions product (s) of the at least one oxidizing agent and trichloro acetic acid, and at least one melting point depressant. The preferred pyrazole is Fipronil, preferably prepared using hydrogen peroxide and dichloro acetic acid at room temperature.

The invention discloses a method for simultaneous determination of dichloroacetic acid, gluconic acid and acetic acid in compound diisopropylamine dichloroacetate tablets by ion chromatography. The contents of dichloroacetic acid, gluconic acid and acetic acid in compound diisopropylamine dichloroacetate tablets aqueous solution are measured by ion chromatography, and then are converted to the contents of diisopropylamine dichloroacetate, sodium gluconate and sodium acetate by formulas. The method disclosed by the invention is used for monitoring a production process of compound diisopropylamine dichloroacetate tablets, has the characteristics of rapidness, simplicity, no interference, high accuracy and simplicity and feasibility in operation, and has strong practicability in improvement of pharmaceutical synthesis process and product quality control.

The invention relates to a treatment method of chloroacetic acid by-product crystallization mother liquid. The treatment method includes the steps of: (1) performing pressure reducing distillation to the crystallization mother liquid obtained from production of chloroacetic acid in a dividing wall rectifying column T1, withdrawing low boiling point impurities from the column top and high boiling point impurities from the column bottom, and withdrawing a monochloroacetic acid and dichloroacetic acid mixture from a side-withdrawing point in the middle of the column; (2) feeding the monochloroacetic acid and dichloroacetic acid mixture withdrawn from the side-withdrawing point of the dividing wall rectifying column T1 to a pressure reducing rectifying column T2 to perform pressure reducing rectification, and obtaining a high-purity monochloroacetic acid product on the top of the column and a high-purity dichloroacetic acid product in the bottom of the column. Compared with the prior art, the rectification is carried out with two sets of rectifying columns, so that effective separation of the chloroacetic acid crystallization mother liquid is achieved. The method greatly reduces equipment cost and energy consumption during separation and can continuously and stably produce the high-purity monochloroacetic acid and dichloroacetic acid products simultaneously. Purities of the products are both more than 99%.

The preparation of dissolved liquid crystal of chitosan grafted polylactic acid includes vacuum deairing of chitosan for 1 hr, charging nitrogen, adding toluene as dispersant, dripping toluene solution of aluminium ethide as catalyst in 1-3 molar times of chitosan, ring opening polymerization of lactide inside solution to produce grafted copolymer of chitosan and polylactic acid. The copolymer is dissolved in trifluoro acetic acid, acetic acid, dichluoro acetic acid or water, and when the solution concentration is greater than 1%, the liquid crystal behavior may be observed in polarizing microscope. The grafted copolymer of the present invention has special performance, and may be used as interface coupling agent for polymer blend of chitin, chitosan and polylactic acid as well as medicine delayed releasing material and other human body implanting biological material and various biological fibrous material.

The invention relates to a preparation method for a heliotropin midbody such as 3,4-methylene dioxy mandelic acid through microwave radiation. The preparation method comprises the following steps: taking methyl dichloroacetate as a raw material, and reacting with sodium hydroxide or methanol solution of potassium hydroxide under microwave radiation to obtain glyoxylic acid water solution; then reacting the obtained glyoxylic acid water solution with 1,2-methylenedioxybenxene under microwave radiation to prepare 3,4-methylene dioxy mandelic acid finally. Through the application of microwave, under the condition that the reaction time is greatly reduced, the yield of 3,4-methylene dioxy mandelic acid is improved.

The invention relates to a synthesis method for stable isotope labeled thiamphenicol and belongs to the field of organic synthesis. The synthesis method for stable isotope labeled thiamphenicol is characterized in that p-bromobenzaldehyde and stable isotope labeled dimethylsulfoxide are taken as raw materials, the raw materials are synthesized to obtain stable isotope labeled p-methylthiobenzaldehyde, oxidization is performed to obtain stable isotope labeled 4-methylsulfonyl benzaldehyde, next, condensation is performed on stable isotope labeled 4-methylsulfonyl benzaldehyde and benzhydrylamine to obtain imine, then imine further reacts with ethyl diazoacetate under the action of (R)-VAPOL and triphenyl borate to build an ethylene imine structure fragment, at last, ring opening is performed on ethylene imine under a dichloroacetic acid condition, an ester group is reduced to synthesize stable isotope labeled thiamphenicol. The raw materials required for synthesis and an intermediate are simple and easily accessible, and the target product (stable isotope labeled thiamphenicol) is high in purity and stable isotope abundance, can be used for internal standard substances for veterinary drug residue test in the food safety field and study of the thiamphenicol metabolic mechanism, and has an important practical application value.

The invention discloses an environment disinfectant for livestock cultivation, which comprising the following components according to part by weight: 5 to 10 parts of potassium permanganate, 1 to 3 parts of dichloroacetic acid, 1 to 4 parts of phthalic dicarboxaldehyde and 90 parts of water. The environment disinfectant for livestock cultivation has the advantages of simple preparation technology, low cost and obvious effect.

The present invention discloses an imitated silk fabric dyeing and finishing process comprising the following steps: 1) pre-treatment; 2) dyeing; and 3) finishing, to be more specific, sequentially pouring 1 to 2 parts by weight of hydroxypropyl methylcellulose, 2.1 parts by weight of sodium benzoate, 1.5 parts by weight of peppermint extract and 0.7 part by weight of dichloroacetic acid into 26 parts by mass of deionized water, stirring well; and then simultaneously pouring 0.4 part by weight of Toosendan, 0.2 part by weight of boron phosphate, 0.7 part by weight of hexamethylenetetramine and 0.9 part by weight of polyethylene glycol stearate, continuing stirring until full mixing to prepare a finishing solution; then padding a fabric in the finishing solution, then taking out, and drying at constant temperature. The fabric dyed and finished by the imitated silk fabric dyeing and finishing process has excellent moth-proofing, mouldproof, antibacterial, flame retardant and antistatic performances, and is strong in washability and soft to touch.

The invention belongs to the field of pharmaceutical chemistry, and discloses a novel synthesis method of Istaroxime. The method comprises the following steps: by using dehydrogenated epiandrosterone as an initial raw material, carrying out epoxidation, ring opening, reduction, oxidation and other reactions to prepare an intermediate M-06; by using ethyl benzoate as an initial raw material, reacting the ethyl benzoate with hydroxylamine hydrochloride to obtain phenyl hydroximic acid, carrying out hydrochlorination and chlorination by using ethanolamine as a raw material to obtain dichloroacetate, and carrying out substitution, hydrolysis and other reactions on the dichloroacetate and the phenyl hydroximic acid to obtain an intermediate M-11; and finally, reacting the M-06 with the M-11 to obtain the end product Istaroxime. According to the method, in the intermediate M-06 synthesis process, the polarity of all the intermediates has great differences from that of the impurities and reaction reagents; and in the intermediate 11 synthesis process, the active spots capable of participating in the chemical reaction in the reaction substrate are simple. Therefore, the method can achieve the requirements without carrying out column chromatography purification, thereby simplifying the synthesis after-treatment process.

An orally applied disotat for treating hepatic dysfunction is prepared from disotat as active component and proper auxiliaries. It may be tablet, coated tablet, effervescent tablet, enteric tablet, chewing tabet, capsule, softgel, pill, etc.

A fiber comprising polyethylene-2,5-furan-dicarboxylate, is prepared by melt spinning in a process wherein a molten composition comprising polyethylene-2,5-furan-dicarboxylate having an intrinsic viscosity of at least0.55 dl/g, determined in dichloroacetic acid at 25 DEG C, is passed through one or more spinning openings to yield molten threads; wherein the molten threads are cooled to below the melting temperature of the composition to yield spun fibers; and wherein the spun fibers are drawn to a linear density in the range of 0.05 to 2.0 tex per fiber. The invention also proves a fiber comprising polyethylene-2,5-furan-dicarboxylate having a linear density of 0.05 to 2.0 tex, wherein the polyethylene-2,5-furan-dicarboxylate has an intrinsic viscosity of at least0.45 dl/g, determined in dichloroacetic acid at 25 DEG C.

The invention provides a drug sustained-release system for treating tumours, which comprises a drug carrier, a drug and a surface active agent. The drug carrier is a biodegradable polymer fibre. The drug is a dichloroacetic acid salt covered and loaded on the drug carrier. The surface active agent is covered and loaded on the drug carrier, wherein the drug accounts for 15-70 wt % of the drug sustained-release system and the surface active agent accounts for 0-15 wt % of the drug sustained-release system. The invention further provides a preparation method of the drug sustained-release system for treating the tumours. The drug sustained-release system can realize the sustained release of the local drug so that the concentration of the local drug around the tumours is in a scope of a therapeutic effect window; however, the drug concentration except the tumours and in body fluid is in a health scope, therefore, the utilization rate of the drugs is increased and the therapeutic effect is guaranteed as well as the usage amount of the drugs is reduced and the toxic side effects caused by large dosage of the drugs are reduced.

The invention discloses a synthesis method of an insecticide teflubenzuron and an intermediate 2,6-difluorobenzamide of the insecticide teflubenzuron, belonging to the field of pesticides. The synthesis method comprises the following steps: step 1, preparation of 2,6-dichlorobenzylidene chloride: preparing turbid liquid of dichlorotoluene and phosphorus pentachloride, introducing chlorine gas, layering materials by utilizing a gas-liquid separator, collecting a crude product, and rectifying the crude product to obtain the 2,6-dichlorobenzylidene chloride; and 2, preparation of 2,6-dichlorobenzonitrile: mixing 2,6-dichlorobenzylidene chloride, acetic acid, zinc chloride, hydroxylamine hydrochloride and sodium acetate, carrying out heating for a reflux reaction, conducting cooling, stirring,filtering and drying successively after the reaction is completed so as to obtain 2, 6-dichlorobenzonitrile. By adopting a one-pot method, a reaction route is shortened, total yield is increased to 67.3% from conventional 55.4%, and cost is greatly reduced.

The invention discloses a method for synthesizing a 4(3H)-quinazolinone derivative by using a cyclization elimination one-pot method. The method comprises the following step: (1) by using acetic acid, formic acid, trifluoroacetic acid or dichloroacetic acid as a solvent, reacting substituted N-methoxy-o-aminobenzene formamide (II) with substituted aldehyde (III) at 70-100 DEG C for 0.3-5.0 hours, so as to generate the 4(3H)-quinazolinone derivative (I) through cyclization elimination, wherein the reaction formula is as shown in the specification. The method disclosed by the invention has the advantages that the method is environment-friendly as no oxidant or heavy metal is adopted for oxidation or catalysis, the operation is simple, reaction raw materials and reaction reagents are easy to obtain, the reaction time is relatively short, the yield is relatively high, and the like.