17 results about "Dichloroethene" patented technology

Azeotropic or azeotrope-like compositions, particularly azeotropic or azeotrope-like compositions consisting essentially of or consisting of (Z)-1-chloro-2,3,3-trifluoroprop-1-ene (HCFO-1233yd(Z)), ethanol, and each of methanol, as well as azeotropic or azeotrope-like compositions consisting essentially of or consisting of (Z)-1-chloro-2,3,3-trifluoroprop-1-ene (HCFO-1233yd(Z)), ethanol, and 1,2-trans-dichloroethylene (trans-DCE), and azeotropic or azeotrope-like compositions consisting essentially of or consisting of (Z)-1-chloro-2,3,3-trifluoroprop-1-ene (HCFO-1233yd(Z)), methanol, and 1,2-trans-dichloroethylene (trans-DCE), and solvent uses of the aforementioned compositions.

The cleaning method of the furnace tube comprises the steps that at the first temperature, pretreatment gas is introduced into a furnace tube to be treated, and the side wall of the furnace tube to be treated is subjected to pre-cleaning treatment; and after pre-cleaning, introducing cleaning gas containing trans-dichloroethylene into the furnace tube at a second temperature, and cleaning the side wall of the furnace tube to be treated. Before the side wall of the to-be-treated furnace tube is cleaned by adopting the cleaning gas containing trans-dichloroethylene, the interior of the to-be-treated furnace tube is pre-cleaned through the pretreatment gas, and the pre-cleaning treatment can remove part of metal ions attached to the side wall of the furnace tube and can also remove part of metal ions attached to the side wall of the furnace tube; chemical bonds between metal ions and materials of the side wall of the furnace tube can be weakened, so that the subsequent cleaning treatment effect is improved, the cleaning effect can be effectively improved, and metal ion residues are reduced.

An aqueous latex [latex (L)] of a vinylidene chloride copolymer [copolymer (A)], wherein the copolymer (A) consists essentially ofrecurring units derived from vinylidene chloride (VDC) in an amount comprised between 89.0 and 91.0 wt % of the copolymer,recurring units derived from methacrylonitrile (MAN) in an amount comprised between 2.00 and 5.50 wt % of the copolymer,recurring units derived from at least one ionic comonomer (ICO) in an amount comprised between 0.5 and 1.4 wt % of the copolymer (A), andrecurring units derived from methylmethacrylate (MMA) in an amount such that the total of recurring units of VDC, MAN, ICO and MMA is 100 wt %,and wherein the latex (L) comprises at least one surfactant [surfactant (S)] in an amount comprised between 0.09 and 1.50 wt % of the copolymer (A).Process for the manufacture of the aqueous latex (L), film made therefrom and retort pouch prepared with such film.

The invention provides a method for preparing trans-1, 2-dichloroethylene through electro-catalysis. The method is a novel process for preparing the trans-1, 2-dichloroethylene by using clean and renewable electric energy as driving force and a chlorine-containing aqueous solution as a chlorine source and by constructing an electro-catalytic reaction system at normal temperature and normal pressure, and can meet the requirements on an environment-friendly trans-1, 2-dichloroethylene preparation process at the present stage; the method has the advantages of high selectivity, high reaction efficiency and low energy consumption.

Cleaning solvent blends comprising an HCFO such as l-chloro-2,3,3,- trifluoropropene; trans-dichloroethylene; and a high boiling HEE such as HFE-7300; have utility as a non-flammable, low-global warming potential, azeotrope-like cleaning solvent compositions. Additional solvent ingredients may include surfactants and co-solvents. A method for cleaning articles of soiling substances comprises contacting the articles with the solvent composition by any suitable means such as a spray delivered by a propellant gas, or by contact with liquid and / or vapor solvent compositions, as in a conventional vapor degreaser apparatus, and removing the composition from the articles.

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 application discloses an ionic liquid containing a boron-containing oxygen ring and a benzene ring, a preparation method and application, and the ionic liquid is obtained by the reaction of tris(trimethylsilyl) borate, dichloroethylene, 4-p-chlorophenyl imidazoline and diisopropylamine; the ionic liquid can be used for alcoholysis of PET to obtain DMT, improve the conversion rate of DMT, and has a significant prospect in the application of PET degradation and recycling of DMT.

The present application belongs to the technical field of catalysts, and particularly relates to a preparation method of a catalytic cracking reaction composite metal catalyst and application thereof in preparation of vinylidene chloride, the preparation method of the catalytic cracking reaction composite metal catalyst comprising the following steps: (1) mixing a chitosan solution with an acetic acid solution, adjusting pH to obtain a mixed solution, and then adding a zinc lactate solution into the mixed solution and mixing uniformly to obtain a zinc chelate solution; (2) mixing the zinc chelate solution, an aluminum-containing compound, a silicon-containing compound and a template agent to form a slurry, forming molecular sieve particles through spray granulation, crystallizing, washing and drying to obtain zinc-containing molecular sieve microspheres; (3) mixing cesium sulfate, oleic acid and octadecene to obtain a cesium oleate solution through a mixing reaction; and (4) dispersing the zinc-containing molecular sieve microspheres into the cesium oleate solution to react, and obtaining the catalytic cracking reaction composite metal catalyst. The present application optimizes process conditions in the preparation process, and forms a perfect catalytic system.

The invention provides a method for co-producing HFO-1234yf and HFO-1234ze. The method comprises the following steps: (1) reacting dichloroethylene with trifluoromethane under the action of a first catalyst to prepare trifluorodichloropropane; (2) carrying out gas-phase dehydrochlorination reaction on the trifluorodichloropropane under the action of a second catalyst to generate trifluorochloropropene; and (3) the trifluorochloropropene and anhydrous hydrogen fluoride are subjected to a gas phase fluorination reaction under the action of a third catalyst, and HFO-1234yf and HFO-1234ze are generated. By optimizing a reaction path and a catalyst system, efficient co-production of HFO-1234yf and HFO-1234ze is realized, and the method has the advantages of mild reaction conditions, high product selectivity and the like, and is suitable for industrial production.

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 application discloses a kind of vinylidene chloride polymerization production process in the process of desalination after slurry washing and impurity removal process, device and application thereof.Slurry washing and impurity removal process includes: after desalination, slurry is transferred to washing kettle with overflow port, cold water is sprayed at the top of washing kettle, hot water is introduced at the bottom, and the resin in slurry is swelled and impurities are removed by alternating cold and hot impact washing, under stirring, impurities overflow out of washing kettle with water through overflow port, part of resin flows out of washing kettle bottom with water and is recycled back to the liquid level below slurry washing mixed solution in washing kettle through washing circulating pump.Slurry washing and impurity removal device includes washing kettle with overflow port, cold water spraying device is arranged at the top in washing kettle, hot water inlet pipe and discharge pipe are connected at the bottom in washing kettle, discharge pipe is connected with one end of washing circulating pump, the other end of washing circulating pump is connected with washing kettle through return pipe, and the outlet of return pipe is located below the liquid level of slurry washing mixed solution in washing kettle.

The present application relates to the technical field of chlorinated alkene preparation, and particularly relates to a preparation method of 1,2-dichloroethylene. The present application is characterized in that acetylene and tetrachloroethane are reacted under the action of a catalyst to generate 1,2-dichloroethylene; the catalyst comprises a metal ruthenium catalyst supported on titanium dioxide; and the loading amount of the metal ruthenium in the catalyst is 0.5-5 wt%. The present application is characterized in that acetylene and tetrachloroethane are reacted under the action of a metal ruthenium catalyst supported on titanium dioxide to generate 1,2-dichloroethylene. The reaction is simple, the raw materials are widely available and inexpensive, the production cost is low, there is no three-waste emission, the operation is safe, and the present application is a clean production process. In addition, the raw materials used in the present application are acetylene and tetrachloroethane, so the atomic economy of the reaction is also high, which is conducive to the implementation and application of the reaction in industry.

The application provides a SiC substrate and an interface state improvement method thereof, and the interface state improvement method comprises the following steps: performing vapor phase cleaning on the surface of the SiC substrate by using dichloroethylene in an oxygen-containing atmosphere; performing first annealing on the cleaned SiC substrate in a mixed atmosphere of N2 and N2O; performing oxidation treatment on the surface of the SiC substrate after the annealing treatment, so as to form a silicon oxide layer; performing second annealing on the SiC substrate after the oxidation treatment in a mixed atmosphere of N2 and N2O; and the volume ratio of N2O to N2 in the second annealing atmosphere is greater than the volume ratio of N2O to N2 in the first annealing atmosphere. By gradient design and synergistic optimization of the gas partial pressure and temperature of the annealing process before and after the oxidation, gradient and controllable doping of nitrogen atoms are realized, and then accurate control from "surface pre-passivation" to "interface depth modification" is realized, so that the interface quality of the gate oxide layer is more effectively improved, and the SiC / SiO2 interface state density is obviously reduced.

Cleaning solvent blends comprising an HCFO such as l-chloro-2,3,3,- trifluoropropene; trans-dichloroethylene; and a high boiling HEE such as HFE-7300; have utility as a non-flammable, low-global warming potential, azeotrope-like cleaning solvent compositions. Additional solvent ingredients may include surfactants and co-solvents. A method for cleaning articles of soiling substances comprises contacting the articles with the solvent composition by any suitable means such as a spray delivered by a propellant gas, or by contact with liquid and / or vapor solvent compositions, as in a conventional vapor degreaser apparatus, and removing the composition from the articles.

The present invention relates to a method for producing 1-chloro-2,2-difluoroethane (HCFC-142 or F142), by reacting gaseous 1,1,2-trichloroethane (HCC-140 or T112) and / or 1,2-dichloroethylene (HCO-1130-E or 1,2-DCE) with gaseous anhydrous hydrogen fluoride (HF), in a reactor in the presence of nanodiamonds, which is economically feasible at industrial scale and which provides high yield and selectivity.

This utility model relates to the field of trans-dichloroethylene condensation technology, specifically a trans-dichloroethylene condenser, comprising a shell and a cover. A ring is fixedly connected to one end of each cover, and rubber pads and insert rings are fixedly connected to the side walls of each ring. A locking mechanism is provided on the shell, comprising two connecting rings and two compression rings. Multiple mounting seats are fixedly connected to each connecting ring, and rotating rods are rotatably connected to each mounting seat. Compression rods are fixedly connected to each rotating rod, and torsion springs are fixedly connected to each compression rod at positions corresponding to the rotating rods. A lever ring is fixedly connected to one side of each compression ring. The beneficial effect of this utility model is that simply rotating the lever ring drives the various components of the locking mechanism to operate in conjunction, completing the locking or disassembly of the cover, significantly improving operational convenience and providing great convenience for replacing internal components of the shell.