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A kind of method for preparing methyl acetoacetate

A technology of methyl acetoacetate and methanol solution, which is applied in the preparation of ketene/polyketene, chemical recovery, etc., can solve the problems that the catalyst cannot be recycled, the purification process is complicated, and the production efficiency is low, so as to achieve cost reduction, purity and Effect of high ratio and reduction of energy consumption

Inactive Publication Date: 2015-09-30
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is because the reaction process is a gap reaction, the conversion rate is 61%, and the product purity is 98%, the catalyst cannot be recycled, resulting in an increase in cost, and the purification process is complicated and the production efficiency is low

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  • A kind of method for preparing methyl acetoacetate
  • A kind of method for preparing methyl acetoacetate
  • A kind of method for preparing methyl acetoacetate

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Embodiment Construction

[0016] In order to further elaborate the technical means and effects that the present invention adopts to achieve the intended purpose of the invention, the specific implementation, features and effects of the method for preparing methyl acetoacetate proposed according to the present invention are described in detail below.

[0017] Such as figure 1 The extractive distillation reaction tower shown includes a reactive extraction rectification tower 1, a vacuum extraction tower 2 is arranged at the lower part of the reactive extraction distillation tower 1, and the bottom of the vacuum extraction tower 2 is connected to the reactive extraction rectification tower through an external circulation pump 7. The extraction agent feed port 9 in the upper part of tower 1, the discharge port 5 at the bottom of the reactive extraction distillation tower is connected to the middle part of the vacuum extraction tower 2, and the top discharge port 3 of the reactive extraction distillation tow...

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Abstract

The invention discloses a method for preparing methyl acetoacetate. The method comprises the following steps: adding a catalyst once, continuously adding ketene dimer and a methanol solution through a raw material feeding hole, continuously adding an extraction agent through an extraction agent feeding hole, simultaneously adding two materials into a reaction-extraction rectifying tower, and starting heating; carrying out total reflux so as to obtain the methanol solution through the tower top of the reaction-extraction rectifying tower and obtain a mixed liquid of the methyl acetoacetate, the catalyst and the extraction agent through the tower bottom of the reaction-extraction rectifying tower, and enabling the mixed liquid to flow into a decompression extraction tower from a tower-bottom discharging hole, so as to obtain a target product, namely the methyl acetoacetate from the tower top of the decompression extraction tower. Due to the arrangement of the reaction-extraction rectifying tower and the decompression extraction tower, the methyl acetoacetate is prepared by virtue of a reaction-rectification and extraction-separation integrated reaction, the materials are fed once, and the catalyst and the extraction agent can be recycled, so that the operation is simple, the cost is lowered, the purity and rate of the prepared methyl acetoacetate are high, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a method for preparing methyl acetoacetate. Background technique [0002] Methyl acetoacetate is an important raw material for the synthesis of "three medicines". It is used as a raw material for pesticides to prepare insecticides, such as "diazinon", "allethrin", "monocrotophos", etc., and to prepare herbicides, such as " Herbicide, etc., and fungicides; used as raw materials for dyes to produce pyrazolone series and aniline derivatives series dyes; used as solvents for the dissolution of cellulose ethers, antimalarials, spices, lacquers and coatings; As a chelating agent, a resin modifier, and a tackifier for printing inks; as a polymerization catalyst to prepare metal complexes such as aluminum and chromium; also as a hydrophobic agent. [0003] There are two traditional production methods of methyl acetoacetate: using diketene and methanol as raw materials, using tertiary amines (boiling point around 280°C) as catalysts, d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/72C07C67/46
CPCY02P20/584
Inventor 顾正桂孙昊王春梅
Owner NANJING NORMAL UNIVERSITY
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