Aldol condensation reaction continuous production method and production system thereof

Abstract

The invention relates to an aldol condensation reaction continuous production method and an aldol condensation reaction continuous production system, and the aldol condensation reaction continuous production method adopts a multi-reactor reaction system and reasonably sets circulation steps, according to the continuous production method, only the reactors need to be moved towards the preset direction at intervals of preset time, or the reactors are fixed, and only the corresponding valves need to be opened or closed at intervals of preset time, so that the switching of the treatment states inthe reactors can be realized, therefore, each reactor sequentially enters a reaction state, a first water washing state, an alkali washing state and a second water washing state for corresponding treatment to form a circulating system of reaction, regeneration and re-reaction, and thus continuous production without interruption is realized, and the industrial production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to an aldol condensation catalytic reaction continuous production method and an aldol condensation catalytic reaction continuous production system. Background technique [0002] Hydroxyaldehyde compounds are an important intermediate of chemical raw materials, which are widely used in various production fields such as petroleum, fine chemical industry, and smelting. Its typical representative is hydroxypivalaldehyde (HPA). [0003] Hydroxypivalaldehyde (also known as 2,2-dimethyl-3-hydroxypropionaldehyde, referred to as HPA) is an important intermediate in the synthesis of various fine chemicals, mainly as a synthetic spirodiol, neopentyl glycol, polyurethane And polyacrylate raw materials and modifiers, as well as synthetic extractants, pesticides, VB5 and other chemical intermediates. HPA can produce hydroxypivalic acid (or hydroxypivalic acid) through hydrogenation (...

AI Technical Summary

Problems solved by technology

US3920760 has reported that 25% sodium carbonate can reduce the generation of by-products as a catalyst, but impurities such as neopentyl glycol are still on the high side, and the reaction time is longer, and the catalyst consumption is larger, and these catalysts all have the same problem, that is, they cannot It is separated from the product HPA aqueous solution

And HPA is a highly active intermediate, acid and alkali will affect its stability, and the presence of inorganic alkali is easy to corrode equipment

Therefore, the presence of catalysts can adversely affect the storage, transportation and subsequent use of HPA

[0004] The team of our company developed, screened and perfected a type of immobilized catalyst (see CN2020110316608) in the early research and development for the catalytic reaction of hydroxy aldehydes, but the catalyst will be deactivated after a period of use, which will lead to the interruption of the production chain and affect the production efficiency

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