Technology method capable of continuously carrying out methyl acetoacetate production

Abstract

The invention discloses a technology method capable of continuously carrying out methyl acetoacetate production, and relates to the technology field of chemical raw material production. The technology production comprises the following steps: adding a methyl acetate finished product into an esterification reactor as a reactor substrate, simultaneously dropwise adding DK and methanol into the reactor; cooling the sleeve of the esterification reactor; keeping on dropwise adding until the fluid in the esterification reactor starts to overflow to the thermal insulation reactor; adding diketene from the overflow pipe; when the fluid in the thermal insulation reactor reaches a certain amount, making the methyl acetoacetate in the thermal insulation reactor overflow to the thermal insulation transfer tank at a constant temperature; pumping the coarse methyl acetoacetate in the thermal insulation transfer tank to a rectifying tower; feeding the coarse product into the rectifying tower from the middle of the rectifying tower, increasing the vacuum degree, carrying out rectification under a certain reflux state so as to obtain finished products; and discharging light components from the tower top, finished products from the middle of the tower, and slag from the tower bottom. The provided technology method is capable of improving work efficiency, greatly increasing the production power, reducing part of steam energy consumption, and saving the equipment investment, can carry out rectification in one tower, and thus reduces the steam energy consumption, moreover the operation is easy to control, and products with a high content are more easily obtained.

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 is an important intermediate in organic synthesis. It has a wide range of uses. Most of its derivatives are varieties with large tonnage. At present, we should focus on the development of pesticide intermediates and pharmaceutical intermediates to meet market demand. [0003] 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...

AI Technical Summary

Problems solved by technology

In addition, the content of our previous products was about 97.0%, which could not meet the needs of the market.

With the rapid development of my country's pharmaceutical industry, especially the development of vitamin drugs and calcium antagonist drugs, there is an urgent need for high-quality products, that is, the product content is greater than 99.0%, but the current production process cannot meet such requirements