7 results about "Ethyl chloroacetate" patented technology

The invention provides an efficient water separation and purification device and process for ethyl chloroacetate. An outlet of the static mixer is connected with an inlet of the filter, an outlet of the filter is connected with an inlet of the centrifugal extraction machine, an outlet of a light phase component in the centrifugal extraction machine is automatically connected with an inlet of the second-stage centrifugal extraction machine, and an outlet of a light phase component in the second-stage centrifugal extraction machine is automatically connected with an inlet of the third-stage centrifugal extraction machine; an outlet of a light-phase component in the third-stage centrifugal extractor is automatically connected with an inlet of a rectifying tower, a light-phase outlet of the rectifying tower is automatically connected with a condenser, and the condenser is connected with a return tank. Through multi-process perfect treatment, the water content and the impurity content of ethyl chloroacetate are reduced to the greatest extent, continuous operation is realized, the time of a washing procedure is greatly shortened, the efficiency is improved, the equipment investment is saved, and the production cost is reduced. The method can be used for most ester products which need to be separated from water and have no high-boiling-point impurities in the system, and the requirement for high purity of the products is met.

The application discloses a kind of photovoltaic glass self-cleaning nano coating and its processing method, for crosslinking grafting on the surface of photovoltaic glass to control water contact angle less than 0.3 °, it is related to photovoltaic maintenance technical field, the photovoltaic glass self-cleaning nano coating includes mesoporous silica, epoxy group polyether, dimethyl diallyl ammonium chloride, enamine, ethyl chloroacetate, crosslinking agent, initiator, silane coupling agent.The application has the photovoltaic glass self-cleaning nano coating of water contact angle less than 0.3 ° formed on the surface of photovoltaic glass, so that water film spread on the surface of photovoltaic glass is separated from the photovoltaic glass self-cleaning nano coating by contaminant, and then the effect of removing contaminant is carried out by using gravity and / or wind power to drive water film to move.

The utility model relates to the technical field of fractionating tower trays, in particular to an efficient fractionating tower tray for ethyl chloroacetate rectification, which comprises a fixedly arranged upper tower drum, a liquid inlet pipe is mounted on the outer side wall of the left side of the lower part of the upper tower drum, and the tail end of the liquid inlet pipe is horizontally rightward and fixedly connected onto the outer side wall of the upper tower drum in a sealing manner; the interior of the liquid inlet pipe is communicated with an upper cavity of the upper tower drum through a liquid inlet, the outer side wall of the lower portion of the upper tower drum is sealed and movably connected to the outer side wall of the upper portion of the lower tower drum in a sleeving mode, a coaxial fluted disc is integrally formed and fixed to the outer side wall of the upper portion of the lower tower drum, and a gas-liquid mixing assembly is installed in a lower cavity of the lower tower drum. Through the structural design that the upper tower drum is sleeved with the lower tower drum and the lower tower drum can rotate circumferentially, and in combination with the arrangement of the vertical scrapers, the vertical scrapers can rotate along with the lower tower drum to scrape the liquid inlet, so that the materials near the liquid inlet are prevented from being accumulated and blocked, the liquid is ensured to smoothly enter the upper tower drum, and the stability and continuity of the fractionation process are maintained.

The invention belongs to the technical field of synthesis, and particularly relates to a synthetic method of ethyl methylthioacetate, which comprises the following steps: taking ethyl chloroacetate and sodium methyl mercaptide as raw materials, taking water and ethyl acetate as solvents, and carrying out catalytic reaction, phase splitting, desolvation and rectification of a phase transfer catalyst to obtain the ethyl methylthioacetate. According to the method, the esterification decomposition influence of the raw materials in an alkaline water phase environment is solved, and meanwhile, the process cost and the process difficulty are greatly reduced.

This invention discloses a method for preparing a low-chlorine composite environmentally friendly antifreeze agent for coal transportation, belonging to the field of antifreeze technology. This invention addresses the technical problems of existing antifreeze agents for coal transportation, such as complex composition and poor antifreeze and metal corrosion resistance. The method for preparing a low-chlorine composite environmentally friendly antifreeze agent for coal transportation includes the following steps: mixing a compound pour point depressant, a modified corrosion inhibitor, a thickening stabilizer, and industrial water. The compound pour point depressant includes organic and inorganic pour point depressants; the organic pour point depressant is obtained by reacting unsaturated nitrile, sodium methyl methacrylate, and fumaric acid; the unsaturated nitrile is obtained by reacting intermediate B with benzaldehyde, and intermediate B is obtained by reacting triazole with ethyl chloroacetate; the modified corrosion inhibitor is obtained by reacting potassium thiocyanate, benzoyl chloride, and chitosan vanillin Schiff base. The antifreeze prepared by this invention has the advantages of moderate fluidity, good metal corrosion resistance, and good antifreeze performance.

The invention discloses a heat-engine plant pipeline descaling cleaning agent and a preparation method and application thereof, and belongs to the technical field of material scientificity, glutamic acid diacetic acid is dissolved in absolute ethyl alcohol, an acid binding agent and ethyl chloroacetate are added, esterification is performed, and glutamic acid diacetic acid tetra (ethoxycarbonyl methyl) ester is obtained; the preparation method comprises the following steps: dissolving 1-hydroxyethylidene-1, 1-diphosphonic acid in dichloromethane, and adding N, N '-dicyclohexylcarbodiimide to react with tert-butyl alcohol to obtain 1-hydroxyethylidene-1, 1-diphosphonic acid di (tert-butyl) ester; the preparation method comprises the following steps: dissolving 2-mercaptobenzothiazole and sodium hydroxide in an alcohol-water mixed solution, adding epoxy chloropropane to react, reacting with an alkaline polyaspartic acid solution to obtain mercaptobenzothiazole grafted modified polyaspartic acid, dissolving the mercaptobenzothiazole grafted modified polyaspartic acid with alkyl glycoside, adding the two esters, and stirring to react to obtain the heat-engine plant pipeline descaling cleaning agent. The two esters are introduced as double precursor components, so that different scales are distinguished, the indifference effect of active components on a whole pipeline system is avoided, and the corrosion risk to a metal base material is reduced.

The invention discloses a method for synthesizing ethyl chloroacetate, which comprises the following steps of: adding ethanol and chloroacetic acid in a certain proportion into a rectification reaction kettle, filling a solid catalyst into a fixed bed reactor, extracting the ethanol and the chloroacetic acid from the bottom of the reaction kettle through a circulating pump, passing through the fixed bed reactor, returning to the reaction kettle, and heating to react; after the material steam passes through the rectifying tower, an azeotrope of ethanol and water is condensed to a membrane separation dehydration device through a condenser, the dehydrated ethanol returns to the reaction kettle, and the reaction is stopped until the chloroacetic acid is completely reacted; through vacuum distillation, ethanol and a small amount of water are collected to a membrane separation dehydration device and can be recycled after dehydration, ethyl chloroacetate is collected to a product collection tank, and normal-pressure synthesis of ethyl chloroacetate and vacuum distillation purification operation are realized in the same reaction kettle. According to the method, the production steps are simplified, and the condition of product deterioration caused by catalyst or metal ion residues is avoided.