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

A technology of methacrylic and methyl, applied in the field of preparing 3-chloro-2-methyl-1-propene, can solve the problems of low product yield, poor control of reaction time, many side reactions, etc. High, targeted enhancement, small cross-contact time effect

Inactive Publication Date: 2008-05-21
丁凌
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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-c

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

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Embodiment 1

[0040] Embodiment 1: as figure 1As 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.

[0041] 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 cy...

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Abstract

The present invention relates to a preparation method of 3-chloro-2-methyl-1-propene, and the above-mentioned technical purpose is solved by the following technical solution: the preparation method of 3-chloro-2-methyl-1-propene, which It is produced by chlorine gas and 2-methyl propylene, and chlorine gas and 2-methyl propylene are cross-contacted in the reactor after spraying out from their respective pipelines. The present invention adopts that two kinds of gases are ejected from the pipeline and cross-contacted in the reactor, so it has good contact, and the amount of substances of the two gases is easy to control, so that the target of the reaction is enhanced, and the cross-contact time of the gases It has the characteristics of short reaction time, small side reactions and high yield.

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 (C4H7C1). 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 lightning -10°C (open cup) 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 material fo...

Claims

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Application Information

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IPC IPC(8): C07C17/10C07C21/04B01J19/26
Inventor 丁凌
Owner 丁凌
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