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Method for production of 1,1-dichloropinacolin

A technology for dichloropinacolone and its production method, which is applied in the production field of dichloropinacolone, can solve the problems of low yield, many by-products, and low production efficiency, and achieve the effects of high yield and high purity

Inactive Publication Date: 2018-01-26
南通利奥化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Dichloropinacolone, also known as 1,1-dichloropinacolone, molecular formula: C 6 h 10 Cl 2 O, molecular weight: 169, is a kind of important chemical intermediate, in the prior art, the method by-product of preparing dichloropinatone is more, and productive rate is lower, and production efficiency is lower

Method used

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  • Method for production of 1,1-dichloropinacolin
  • Method for production of 1,1-dichloropinacolin
  • Method for production of 1,1-dichloropinacolin

Examples

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Embodiment 1

[0020] The present embodiment relates to a kind of production method of dichloropinacol, such as figure 1 shown, including the following steps:

[0021] 1) Feeding: After accurately measuring the isopentene through the metering tank, pump it into the isopentene cooling kettle, use a frozen brine jacket to cool for 1 hour, and control the temperature between -5 and 0 °C. The volatilized isopentene (calculated as non-methane total hydrocarbons) is condensed and refluxed through the condenser.

[0022] 2) Addition: pump the metered hydrochloric acid into the addition reaction kettle, use a chilled brine jacket for cooling, and control the temperature at 0°C. The frozen isopentene was added dropwise into the addition reaction kettle, the reaction temperature was maintained at 0-3°C, and the reaction was stirred for 0.5h. After the dropwise addition, the reaction was incubated for 0.5h at 0-3°C. The reaction equation of this process is as follows:

[0023] Main reaction:

[00...

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Abstract

The invention provides a method for production of 1,1-dichloropinacolin. The method comprises that S1, isopentene and hydrochloric acid undergo an addition reaction to produce 4-chloro-2-methylbutane,S2, 4-chloro-2-methylbutane and formaldehyde undergo a condensation reaction to produce pinacolone and S3, the pinacolone is rectified and then is chlorinated by chlorine to produce 1,1-dichloropinacolin. The method has a high yield and high purity.

Description

technical field [0001] The invention relates to a method for producing dichloropinacol, and belongs to the technical field of organic synthesis. Background technique [0002] Dichloropinazone, also known as 1,1-dichloropinazone, molecular formula: C 6 H 10 Cl 2 O, molecular weight: 169, is an important chemical intermediate, in the prior art, the method for preparing dichloropinacolone has many by-products, the yield is low, and the production efficiency is low. SUMMARY OF THE INVENTION [0003] In view of the defects in the prior art, the purpose of this invention is to provide a kind of production method of dichloropinacol. [0004] The present invention is achieved through the following technical solutions: [0005] The present invention provides a kind of production method of dichloropinacol, which comprises the following steps: [0006] S1, isopentene and hydrochloric acid are subjected to addition reaction to obtain 4-chloro-2-methylbutane; [0007] S2, carry o...

Claims

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Application Information

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IPC IPC(8): C07C45/63C07C49/16
Inventor 陈培杨志刚卫亚军于蓓蓓
Owner 南通利奥化工科技有限公司