Process method for synthesizing isobutyric acid by using microchannel reactor

Abstract

The invention discloses a process method for synthesizing isobutyric acid by a microchannel reactor, the process method comprises the following steps: S1, setting a reaction device which comprises a mixing module and at least four reaction modules; s2, mixing the materials, and enabling the materials to enter the reaction modules of the reaction device for reaction; s3, obtaining a product at the tail end of the reaction device; in the step S1, the reaction device is a micro-channel reactor; in the step S2, material mixing comprises the following steps: step S201, dissolving a catalyst in isobutyraldehyde to obtain a liquid-phase mixture; and step S202, conveying the liquid-phase mixture obtained in the step S201 and oxygen into a mixing module. According to the method, the risk of oxidation reaction is reduced, the one-time conversion rate of the reaction is improved, and isobutyric acid with the content of 70% or above can be directly obtained; the reaction selectivity is improved, byproducts are few, and the consumption of raw materials is reduced; the method does not occupy a large area, is high in heat and mass transfer and good in mixing effect, and can realize efficient and continuous work.

Description

technical field [0001] The invention relates to a method for synthesizing isobutyric acid, in particular to a process for synthesizing isobutyric acid with a microchannel reactor. Background technique [0002] Isobutyric acid is an important organic acid, mainly used in the synthesis of esters, cellulose flame retardants, synthetic resins and other organic synthesis. Industrially, isobutyric acid is mainly synthesized by liquid-phase oxidation of isobutyraldehyde and gas-phase catalytic hydrogenation of methacrylic acid, and the cost of gas-phase catalytic hydrogenation of methacrylic acid is high. [0003] At present, the liquid-phase oxidation method of isobutyraldehyde is adopted in industry, that is, isobutyraldehyde is oxidized with oxygen or air to synthesize isobutyric acid. At present, this process has the disadvantages of low reaction selectivity, many by-products, and high raw material consumption. Moreover, the equipment of this process needs to occupy a large ar...

AI Technical Summary

Problems solved by technology

At present, this process has the disadvantages of low reaction selectivity, many by-products, high consumption of raw materials, etc., and the equipment of this process needs to occupy a large area. Due to low heat and mass transfer and poor mixing effect, efficient continuous work cannot be achieved.