Process of continuously producing methyl acetoacetate

A technology for the production of methyl acetoacetate, applied in the preparation of carboxylic acid esters, the preparation of organic compounds, organic chemistry, etc., can solve the problems of wasting time and cost, inaccurate control, and low output, and save time and cost , accurate control, and the effect of reducing energy consumption

Inactive Publication Date: 2016-03-09
JIANGSU TIANCHENG BIOCHEM PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The continuous production process of methyl acetoacetate in the prior art has less output during production, inaccurate control, and waste of time and cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] This specific embodiment adopts following technical scheme: its production technology is as follows:

[0014] Step 1: A partition is welded in the middle of the esterification kettle to separate the esterification kettle into a cooling chamber and a heat preservation chamber, and the cooling chamber is connected to the heat preservation chamber through an overflow pipe;

[0015] Step 2: Add the finished product of ethyl acetate and methyl acetate in the esterification kettle as the bottom material in the kettle, and simultaneously add DK and methanol dropwise into the cooling chamber;

[0016] Step 3: Realize water cooling and air cooling in the cooling chamber. After the cooling chamber is cooled, pressurization is realized. After pressurization, the product overflows into the heat preservation chamber through the overflow pipe. When overflowing, add diketene from the overflow pipe;

[0017] Step 4: When a certain amount is reached in the heat preservation bin, the met...

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PUM

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Abstract

The invention discloses a process of continuously producing methyl acetoacetate and relates to the technical field of production of chemical raw materials. The production process comprises the following steps of firstly, welding a separation board at the middle of an esterification reactor for separating the esterification reactor into a cooling bin and an insulating bin; secondly, adding a methyl acetoacetate finished product into the esterification reactor to serve as a bottom material in the reactor, and meanwhile, simultaneously dropping DK and methanol into the cooling bin; thirdly, realizing water cooling and air cooling in the cooling bin; after the cooling bin is cooled, realizing pressurization; after pressurization, enabling a product to overflow to the inside of the insulating bin through an overflow pipe; during overflowing, adding diketene on the overflow pipe; fourthly, when the product in the insulation bin reaches a certain amount, transferring the methyl acetoacetate to the inside of a rectifying tower through a transfer pump; fifthly, vacuumizing the inside of the rectifying tower for exhausting air, and meanwhile, inputting nitrogen, and rectifying the methyl acetoacetate in a reflux state to obtain a final product at the moment. According to the process disclosed by the invention, quick production can be realized, the finished product output is improved, the accuracy in control is realized, and the time and the cost are saved.

Description

Technical field: [0001] The invention relates to the technical field of production of chemical raw materials, in particular to a process for continuously producing methyl acetoacetate. Background technique: [0002] Methyl acetoacetate has a wide range of functions. In the pesticide industry, methyl acetoacetate is mainly used in the synthesis of insecticides diazinon, propylene herbicide, herbicides pyrazolid, metazazone, benzoxazole, bactericidal Agent soil fungus, etc. As a chemical auxiliary agent, methyl acetoacetate can be used not only as a cellulose ester solvent, but also as a solvent for the synthesis of antimalarial drugs, spices, and coatings; in addition, it can be used as a solvent for the synthesis of aluminum alkoxide and chelating agent, used for resin modification, printing ink enhancement It can also be used as a polymerization catalyst to prepare metal coordination compounds with aluminum, chromium, etc.; in the pharmaceutical industry, methyl acetoaceta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/46C07C67/54C07C69/72
CPCC07C67/46C07C67/54
Inventor 陈飞王小清崔惠忠陶建峰刘长兵蒋玉林
Owner JIANGSU TIANCHENG BIOCHEM PROD
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