16 results about "Trichloroethane" patented technology

The invention provides chlorotrifluoroethylene continuously prepared based on a microchannel reactor and a preparation method of the chlorotrifluoroethylene, and the chlorotrifluoroethylene comprises the following raw materials in parts by weight: 1, 1, 2-trifluoro-1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 The low-temperature refrigerant refrigerant is prepared from the following components in parts by weight: 90 to 100 parts of 1, 2-trichloroethane, 1 to 5 parts of a zinc fluoride induced palladium-copper bimetallic catalyst, 8 to 15 parts of a cyclohexyl dimethyl ether-formic acid composite hydrogen donor, 0.5 to 2 parts of trifluoroacetic anhydride, 0.1 to 0.5 part of a perfluoropolyether lubricant, a proper amount of a low-temperature mixed refrigerant and 15 to 20 percent by weight of diluted hydrochloric acid. According to the invention, the preparation efficiency and product purity of chlorotrifluoroethylene can be improved, and stable operation of the preparation system and reasonable treatment of byproducts can be guaranteed.

The application discloses a preparation method and application of a catalyst for cracking 1,2-dichloroethane to produce vinyl chloride, and comprises the following steps: 1) a neodymium ore is leached with hydrochloric acid, and after filtering a leaching solution, potassium chloride is added to form a doped precursor K2[NdCl3]; 2) an active metal oxide is dissolved in hydrochloric acid, and then added into the doped precursor K2[NdCl3] solution, and co-precipitation is carried out by adding alkali to obtain an emulsion of a doped active component; the active metal oxide is at least one of oxides of vanadium, manganese, titanium and scandium; 3) the emulsion of the doped active component is mixed with a liquid carrier to obtain the catalyst; the liquid carrier is one or more of chloroform, carbon tetrachloride, 1,1,2-trichloroethane and chlorobenzene.

An object of the present invention is to provide a novel azeoropic or azeotrope-like composition that is effective for the separation of HF from 1,1,2-trichloroethane (HCC-140), trans-1,2-dichloroethylene (HCO-1130(E)), or cis-1,2-dichloroethylene (HCO-1130(Z)). The object can be achieved by an azeotropic or azeotrope-like composition comprising HCC-140, HCO-1130(E), or HCO-1130(Z), and hydrogen fluoride.

The invention discloses a novel refrigerant and a preparation method thereof, and an underground phase change temperature adjusting device, method and equipment, and relates to the technical field of underground operation, the novel refrigerant containing trichloroethane and dichloropropane provided by the invention is in a liquid state at normal temperature and normal pressure, the boiling point temperature can be about 70-110 DEG C according to different component contents at the normal pressure, and the temperature of the refrigerant can be about 70-110 DEG C according to different component contents. The critical temperature of the novel refrigerant can reach about 130-300 DEG C according to different component contents under pressurization, so that the novel refrigerant provided by the invention can be subjected to phase change in a high-temperature environment, the novel refrigerant can be applied to underground phase change temperature adjusting devices and equipment for high-temperature operation, heat can be absorbed by utilizing heat absorption phase change to realize cooling, and the service life of the novel refrigerant is prolonged. The heat release phase change can release heat to achieve temperature rise, so that heat transfer and temperature control are achieved, the temperature control device can be suitable for controlling the temperature of the working environment of underground instruments and equipment, and the instruments and equipment can normally, stably and reliably work underground.

The invention discloses a non-metal pipeline with heat preservation performance and a manufacturing method thereof. The non-metal pipeline comprises a non-metal pipe body, a heat preservation layer and a polyethylene outer protection pipe, wherein the non-metal pipe body is sequentially and coaxially sleeved with the heat preservation layer and the polyethylene outer protection pipe. The non-metal pipe body is further sleeved with a plurality of supports, and the other free ends of the supports abut against the polyethylene outer protection pipe. The thermal insulation layer is prepared by foaming and curing a thermal insulation material; the thermal insulation material comprises a component A and a component B, the component A comprises the following components in percentage by mass: 1%-5% of ethylenediamine polyether, 0.5%-2.5% of triethanolamine trifluorotrichloroethane silicone oil, 5%-10% of B-trichloroethyl phosphate and the balance of I type fire-retardant polyether; the component B is prepared from polyphenyl polyisocyanate; the mass ratio of the component A to the component B is 1: (1-1.05). The non-metal pipeline has a good heat preservation effect.

The invention relates to the field of environmental microbial remediation, in particular to a compound microorganism for degrading organochlorine pollutants and application of the compound microorganism. The compound microorganism is composed of a bacillus subtilis IAE strain (Geobacter lovleyi sp.strain IAE) and a dehalogenation coccus sp. Strain (Dehalococcoides mccaryi strain BAV1), and the compound microorganism is composed of a bacillus subtilis strain (Geobacter lovleyi sp.strain IAE) and a dehalogenation coccus sp. Strain (Dehalococcoides mccaryi strain BAV1); the preservation number of the bacillus subtilis is CGMCC (China General Microbiological Culture Collection Center) No: 1.5298. Aiming at soil and underground water polluted by high-concentration 1, 1, 2-trichloroethane, the compound bacterium completely degrades 1, 1, 2-trichloroethane into non-toxic ethylene through the synergistic effect of a double dechlorination reaction and a hydrogenolysis dechlorination reaction respectively driven by an IAE strain and a BAV1 strain.

The invention provides a preparation method of polymerized polyamine maleimide resin, and belongs to the technical field of high polymer materials. Comprising the following steps: 1) mixing maleic anhydride, a solvent and 1, 1, 2-trichloroethane; 2) mixing the polyphenyl polyamine, the solvent and the 1, 1, 2-trichloroethane; (3) dropwise adding the polyphenyl polyamine solution into the maleic anhydride solution to carry out amidation reaction; (4) adding a catalyst into an amidation reaction system, and heating to carry out cyclization dehydration reaction; 5) when the temperature of the cyclization dehydration reaction reaches 85-95 DEG C, carrying out gradient heating decompression dehydration and solvent reflux operation, and when the reaction material is in a homogeneous phase state, stopping the reaction and cooling; 6) washing and desolventizing the obtained cooled material to obtain the polymeric polyamine maleimide resin.The preparation method provided by the invention not only can reduce the reaction temperature, reduce the energy consumption and effectively reduce the occurrence of side reactions, but also enables the molecular weight distribution of the prepared product to be more concentrated.

The invention provides a process for manufacturing 1-chloro-2,2-difluoroethane (HCFC- 142) from 1,1,2-trichloroethane (HCC-140) and optionally, one or more of E / Z-1,2- dichloroethene (HCO-1130(E / Z)), E / Z-1-fluoro-2-chloroethene (HCFO-1131(E / Z)), and 1- fluoro-1,2-dichloroethane (HCFC-141). The invention also provides to a process for manufacturing a difluoroethyl derivative from HCFC-142 obtained using the process of the invention.

The invention discloses a method for recycling high value-added substances (1, 1, 2-trichloroethane and TCE) from heavy component waste liquid generated in the VCM (vinyl chloride) generation process, which comprises the following steps: 1) carrying out pretreatment such as hydrogenation or chlorination on the heavy component waste liquid to remove impurities difficult to separate from the heavy component waste liquid; 2) removing high-boiling-point impurities difficult to separate, such as tar, coke and the like, in a novel supergravity rotary rectification manner or a manner of combining scraper solid removal with rectification; and 3) further rectifying and purifying the obtained crude product to obtain the product 1, 1, 2-trichloroethane. The method is simple in technological process, high in recovery rate, high in product purity and stable in device operation, impurities difficult to separate are removed and the technological process is simplified through a direct heavy component pretreatment mode, high-added-value utilization of waste materials can be achieved, economic benefits are generated, energy consumption and carbon emission of the device are reduced, and the method is a novel VCM heavy component recycling technology worthy of popularization.

The present invention is directed to systems and methods for removing trichloroethane (TCA), trichloroethene (TCE), and 1,4-dioxane (1,4-D) from contaminated water and wastewater. The system and methods relying on catalyst reduction of TCA and TCE, and the reduced products are degraded by microorganisms that are capable of biodegrading ethane and 1,4-D. In certain embodiments, a catalyst film comprises precious nanoparticles with diameters of 5-40 nm and a biofilm comprising microorganisms that are capable of degrading ethane and 1,4-D are used in a dual-reactor system to remove TCA, TCE, and 1,4-D from contaminated water and wastewater.

The application discloses a chlorination process of sucrose-6-acetate, which comprises the following steps: preparing a Vilsmeier reagent by using DMF and chlorosulfuric acid under low-temperature conditions, releasing sulfur dioxide by heating, mixing the Vilsmeier reagent with 1,1,2-trichloroethane as a reaction raw material liquid, mixing the reaction raw material liquid with a pre-cooled DMF solution of sucrose-6-acetate through a pipeline mixer, performing high-temperature chlorination reaction and removing hydrogen chloride by using a three-stage continuous reactor, and sequentially neutralizing the chlorination liquid by using ammonia water and sulfuric acid, so that the target product can be obtained by controlling pH=7-7.5. The process flow is simple, the continuous process of low-temperature mixing, high-temperature reaction and neutralization reaction is realized, the complicated process of separating hydrogen chloride and sulfur dioxide can be omitted, the product yield is improved, the number of production equipment is reduced, the production cost is lowered, and the process has good industrial application value.

This invention relates to the field of environmental bioremediation, specifically to a novel strain of *Desulfovibrio* Co. and its application in reducing sulfate-oxidizing sulfides and degrading and converting 1,1,1-trichloroethane. The *Desulfovibrio* Co. strain was deposited on February 24, 2024, at the China General Microbiological Culture Collection Center (CGMCC), located at No. 3, Courtyard 1, Beichen West Road, Chaoyang District, Beijing, Institute of Microbiology, Chinese Academy of Sciences, 100101, China, accession number CGMCCNo. 41182.

The application relates to the field of organic synthesis, in particular to a preparation method of trichlorotrifluoroethane and trifluoroacetic acid, which comprises the following steps: adding trichloroethylene, a catalyst and anhydrous hydrogen fluoride into a pressure kettle, stirring, slowly heating and performing a fluorination reaction, stopping the fluorination reaction, not releasing the hydrogen chloride gas generated in the reaction process, and cooling to-33 DEG C to 0 DEG C; introducing chlorine gas into the reaction kettle, closing the valve of the pressure kettle, slowly heating and reacting, controlling the temperature in the kettle at 30-40 DEG C after the reaction is completed, slowly releasing the gas in the kettle into alkali water absorption, finally discharging the remaining liquid from the bottom valve of the kettle, and adding the liquid into the alkali water for quenching; adding water, standing and separating, and taking the lower oily substance as a trichlorotrifluoroethane crude product; and performing rectification to obtain a finished product. The application can avoid separation and purification of a low-boiling-point fluorination intermediate 1,1,1-trifluoro-2-chloroethane, avoid loss of the intermediate in a post-treatment operation process, and simplify the operation.

The present invention relates to a method for assaying the quantity of hydroxyl functions present in a polyol, the method comprising the following steps: (i) acetylating the hydroxyl functions of the polyol into ester functions by reacting the polyol with acetic anhydride in excess; (ii) hydrolyzing the mixture of acetylated polyol, acetic anhydride and acetic acid obtained at the end of step (i); and (iii) assaying by potentiometry the acetic acid obtained at the end of step (ii), the acetylation step (i) being carried out in the presence of at least one 4-dialkylaminopyridine catalyst of formula (1) or one of the salts thereof: wherein R and R', which are identical or different, are C1-C6 alkyl groups, or R and R' together form a C2-C6 ring, in the presence of at least one solvent selected from toluene, and in the presence of at least one cosolvent selected from xylene, anisole, benzene, chlorobenzene, bromobenzene, cyclohexane, octane, heptane, dichloromethane, dichloroethane, trichloroethane, carbon tetrachloride, trichloroethylene, chloroform, acetonitrile, dimethylformamide, dimethylacetamide, ethyl acetate, acetone, pyridine.

The utility model belongs to rectifying column technical field, concretely is a kind of rectifying column of rectifying high-purity trichloroethane, including rectifying column main body, gas discharge pipe, liquid discharge pipe, feed pipe, steam inlet pipe, reflux inlet pipe and sieve plate, the top of rectifying column main body is connected with the gas discharge pipe for steam discharge, the bottom of rectifying column main body is connected with the liquid discharge pipe for trichloroethane liquid discharge, the outside of rectifying column main body is connected with the feed pipe for material entering.The utility model can carry out normal rotation to threaded rod, when threaded rod rotates, drive tooth holder to carry out thread sliding, when tooth holder moves, drive limiting block and limiting groove to slide, by supporting seat, feed pipe, steam inlet pipe and reflux inlet pipe and the pipeline connected with it can be respectively assisted to support, to improve the stability of each pipeline connection and place, not easy to make pipeline appear droop deformation etc.

The application provides a process for recovering sucralose hexaester from trichloroethane in tail gas of sucralose, and belongs to the field of food additive production.The process method of the application is that first, impurities such as sulfur dioxide in total trichloroethane are removed to obtain relatively pure trichloroethane, then the trichloroethane is subjected to neutralization treatment and extraction of sucralose hexaester, so that the problem of difficult recovery of sucralose hexaester after water washing of total trichloroethane in tail gas of a chlorination section is solved, the recovery rate of sucralose hexaester is high, the consumption of sucralose hexaester is reduced, the cost is saved, and the discharge is reduced.