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A kind of preparation method of 2,2-dimethoxypropane

A technology of dimethoxypropane and methanol, which is applied in the field of preparation of 2,2-dimethoxypropane, can solve the problems of troublesome post-processing, complex reaction system and process, and difficulty in industrial production, and achieve single conversion high rate effect

Active Publication Date: 2021-08-27
ZHEJIANG MEDICINE CO LTD XINCHANG PHAMACEUTICAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the reaction system and process are more complicated, and the post-treatment is more troublesome, so it is not easy for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 5.0g Fe 2 o 3 (2% mole content) modified SO 4 2- / SnO 2 The catalyst is filled into the packed column of the reactor with rectification tower, 5000g of methanol and 5000g of acetone are continuously pumped into the preheater through the metering pump according to the volume ratio of about 1:1, and preheated at 85°C-95°C The reactors are preheated and vaporized separately, and continuously enter the reactor at the bottom of the rectification tower. The temperature of the reactor is controlled at 85°C-95°C, acetone and methanol contact the catalyst and react to generate 2,2-dimethoxypropane, and the mixture of 2,2-dimethoxypropane, acetone and methanol is continuously extracted through the top separation , the water generated is discharged from the bottom of the tower. During the reaction process, control the discharge and feed speed to balance the feed and feed, control the discharge and feed speed to 8-10g / min, and keep the temperature at the top of the tower at 56...

Embodiment 2

[0032] 5.0g Al 2 o 3 (2% mole content) modified SO 4 2- / SnO 2 The catalyst is filled into the packed column of the reactor with rectification tower, 5000g of methanol and 4000g of acetone are continuously pumped into the preheater through the metering pump according to the volume ratio of about 5:4, and preheated at 85°C-95°C The reactors are preheated and vaporized separately, and continuously enter the reactor at the bottom of the rectification tower. The temperature of the reactor is controlled at 85°C-95°C, acetone and methanol contact the catalyst and react to generate 2,2-dimethoxypropane, and the mixture of 2,2-dimethoxypropane, acetone and methanol is continuously extracted through the top separation , the water generated is discharged from the bottom of the tower. During the reaction process, control the discharge and feed speed to balance the feed and feed, control the discharge and feed speed to 8-10g / min, and keep the temperature at the top of the tower at 56...

Embodiment 3

[0034] 5.0g Ga 2 o 3(1.5% mole content) modified SO 4 2- / SnO 2 The catalyst is filled into the packed column of the reactor with rectification tower, 5000g of methanol and 4000g of acetone are continuously pumped into the preheater through the metering pump according to the volume ratio of about 5:4, and preheated at 85°C-95°C The reactors are preheated and vaporized separately, and continuously enter the reactor at the bottom of the rectification tower. The temperature of the reactor is controlled at 85°C-95°C, acetone and methanol contact the catalyst and react to generate 2,2-dimethoxypropane, and the mixture of 2,2-dimethoxypropane, acetone and methanol is continuously extracted through the top separation , the water generated is discharged from the bottom of the tower. During the reaction process, control the discharge and feed speed to balance the feed and feed, control the discharge and feed speed to 8-10g / min, and keep the temperature at the top of the tower at 5...

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Abstract

The invention discloses a preparation method of 2,2-dimethoxypropane. The present invention uses methanol and acetone as raw materials, and the SO2 modified by metal oxides 4 2‑ / SnO 2 The catalyst catalyzes the reaction, including the following reaction steps: step a), methanol and acetone are preheated and vaporized through a preheater, and the preheating temperature is 65-95°C; step b), the vaporized methanol and acetone enter the reactor respectively, Exposure to metal oxide modified SO in the reactor 4 2‑ / SnO 2 The catalyst is catalyzed, and the crude product produced by the reaction contains 2,2-dimethoxypropane and unreacted methanol and acetone, and the temperature of the reactor is kept at 83-95°C; wherein, the metal oxide is Fe 2 o 3 、Al 2 o 3 , Ga 2 o 3 A mixture of one or more of them. The method adopted in the present invention is carried out at relatively high temperature, which solves the problem of long reaction time at low temperature, and the single conversion rate is relatively high, and no new impurities are introduced in the subsequent concentration process.

Description

technical field [0001] The present invention relates to the preparation method of 2,2-dimethoxypropane, especially a kind of SO that adopts metal oxide modification 4 2- / SnO 2 A method for the continuous synthesis of 2,2-dimethoxypropane as a catalyst. Background technique [0002] 2,2-Dimethoxypropane, also known as acetone dimethyl acetal, is a very important organic compound, which can be used as a protective agent, ring shrinkage agent, condensation agent, herbicide, dehydrating agent, insecticide, etc., and it It is also widely used in the development and industrial production of fine chemical products such as medicine, pesticide and natural products. However, one carbon atom in this compound is connected with two methoxyl groups, the steric hindrance is large, the chemical activity is very strong, and it is very easy to absorb water and hydrolyze, so its synthesis is special. [0003] At present, there are two main synthesis methods of 2,2-dimethoxypropane: direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/303C07C41/56C07C41/58
CPCC07C41/56C07C41/58C07C43/303
Inventor 翟德伟霍鸿飞刘冬张献炉邵斌
Owner ZHEJIANG MEDICINE CO LTD XINCHANG PHAMACEUTICAL FACTORY
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