Method for preparing 3-chlorine-2-methyl-1-propylene

A technology of methyl propylene and methyl, which is applied in the field of preparing 3-chloro-2-methyl-1-propene, and achieves the effects of less side reactions, high yield and large product yield

Inactive Publication Date: 2010-09-29
丁凌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chlorine gasification of 2-methylpropene is an exothermic reaction. The heat of reaction is 108.9KJ / MOL. The existing technical scheme for preparing 3-chloro-2-methyl-1-propene using the above principle has many side reactions, and the reaction time is controlled Not good, resulting in low product yield

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  • Method for preparing 3-chlorine-2-methyl-1-propylene
  • Method for preparing 3-chlorine-2-methyl-1-propylene

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Embodiment 1

[0044] Embodiment 1: as figure 1 As shown, the present invention ensures enough time to complete the main reaction by adjusting the size of the reaction space, so that the light boiling chlorination side reaction is reduced to the minimum, and the reaction time is short enough (≤0.01s); the heat of reaction is required to be taken away quickly, reducing HCl The contact time with 2-methylpropene, the reaction product and chlorine gas can avoid the occurrence of side reactions of polychlorinated high boilers.

[0045] Such as figure 1 , a chlorination reaction device for preparing 3-chloro-2-methyl-1-propene from chlorine and 2-methylpropene, which includes a reactor A and a reaction system B. The chlorine gas feeding pipe 1 enters the outer pipe 3 through the porous side 2 of the pipe wall, and the outer pipe 3 has a conical nozzle 4 at the end, and the shape of the conical nozzle 4 is cylindrical; the 2-methacrylic feeding pipe 5 passes through the 2-methacrylic pipe 6 The...

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Abstract

The invention relates to a preparation method of 3-chlorine-2-methyl-1-propylene. The purpose of the technology is achieved by a following technical proposal that the preparation method of the 3-chlorine-2-methyl-1-propylene is made from chlorine and 2-methyl propylene which are sprayed out from respective pipelines for the cross contact reaction inside a reactor. The invention adopts the method of spraying the two kinds of gas from the pipelines and the cross contact inside the reactor, therefore the invention has the characteristics that the contact is good; the substantial quantities of the two kinds of gas can be controlled easily, which increases the target character of the reaction; the cross contact time of the gas is very short, so the reaction time is short, the side reaction is little, the yield is high etc.

Description

technical field [0001] The present invention relates to a preparation method of 3-chloro-2-methyl-1-propene, in particular to an industrial method for preparing 3-chloro-2-methyl-1-propene through chlorine gas and 2-methylpropene. Background technique [0002] 3-Chloro-2-methyl-1-propene (C4H7Cl). Colorless transparent liquid. The boiling point is 72.2°C, the freezing point is below -80°C, the relative density is 0.9527, the refractive index is 1.4276, and the flash point is -10°C (open cup). It is slightly soluble in water and can be dissolved in various organic solvents. Toxicity: Oral LD50 for rats is 395mg / kg. [0003] 3-Chloro-2-methyl-1-propene, which is a fine chemical product obtained by reacting chlorine gas and 2-methylpropene as the main raw material and then rectifying the crude product. This product is an important organic intermediate, which can be widely used in the fields of medicine, pesticide, spices, synthetic materials and so on. It is the main raw m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/26C07C21/04C07C17/10
Inventor 丁凌
Owner 丁凌
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