High-selectivity 2-methyl allyl chloride synthesis method and synthesis reactor

Abstract

The invention relates to a high-selectivity 2-methyl allyl chloride synthesis method and a synthesis reactor. Isobutene and chlorine are taken as the raw materials to have a gaseous phase chlorinationreaction in a microchannel reactor with a cooling surface to obtain the 2-methyl allyl chloride. The isobutene and the chlorine are reacted in the T-shaped microchannel reactor, the mixing speed is quite fast, meanwhile, the huge heat exchange area in the unit reaction volume guarantees the stable reaction at the basically constant temperature, the controllability is good; therefore, the side reaction caused by too high local temperature is effectively inhibited, the reaction selectivity is high, and no phenomenon of coking is caused.

Description

technical field [0001] The invention relates to the chlorination reaction and equipment of organic matter, and belongs to the field of organic synthesis reaction. Background technique [0002] 2-Methyl-3-chloroallyl is an important intermediate in organic synthesis, widely used in medicine, pesticides, spice monomers, polymer materials and other fields. [0003] 2-Methyl-3-chloroallyl is usually obtained by gas-phase chlorination of isobutylene with chlorine. [0004] The early chlorination reaction is carried out in a tubular reactor with a cooling jacket. The reaction temperature is below 100°C, the pressure is normal pressure, and the reaction residence time is in the range of 0.5 seconds to several seconds. In order to avoid deep chlorination side reactions, It is usually necessary to maintain an excess of isobutene, and the two raw materials are injected into the reaction tube by injection. [0005] In order to avoid temperature fluctuations in the reaction process, D...

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Problems solved by technology

[0009] The disadvantage of the above-mentioned chlorination technology is that there is no cooling surface in the reaction place, and the temperature cannot be controlled. Therefore, there are many side reactions, low selectivity, and the nozzle or nozzle will be blocked due to coking due to excessive chlorination.

[0010] Aiming at the problem that the nozzle is easy to coke, CN202044960 proposes to use a flat nozzle in the utility model patent, and at the same time remove the heat of reaction by circulating the chlorination reactant directly in contact with the reaction gas to cool, but the patent does not provide examples to prove the solution The problem of coking has been solved, and there is no example to prove that the product content in the reaction solution has reached 88%.

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