Deep dehydrating method for methylacrolein

Abstract

The invention relates to the technical field of the petrochemical industry and in particular to a deep dehydrating method for methylacrolein. The method comprises the following steps: using the methylacrolein as a raw material; using polyhydric alcohol as a dehydrating agent, and mixing and stirring the methylacrolein and the polyhydric alcohol according to the weight proportion of 1:0.5-20, conveying to a demixer after uniformly stirring, taking supernatant liquid after stewing and layering, to obtain the dehydrated methylacrolein. The operation process is simple, the energy and material consumption is effectively reduced, the polymerism of the methylacrolein caused by the high temperature can be avoided, the working period is prolonged, the industrial production requirements can be satisfied better, and the method is suitable for extensive popularization and application.

Description

[0001] (1) Technical field [0002] The invention relates to the field of petrochemical industry, in particular to a deep dehydration method of methacrolein. [0003] (2) Background technology [0004] As an important chemical raw material, methacrolein has been widely used in the fields of organic synthesis and new materials. It is mainly used in the manufacture of copolymers and resins. It is also the raw material for the production of methacrylic acid and methyl methacrylate and thermoplastic Raw materials for plastic monomers. Due to the certain solubility of water in methacrolein and the characteristic of azeotropy with water, it is difficult to dehydrate methacrolein, so that a certain amount of water is carried in the methacrolein product. Due to the existence of a small amount of free water in methacrolein, it affects the stability of its own properties and the performance of downstream products to a certain extent; at the same time, the content of free water in the al...

AI Technical Summary

Problems solved by technology

The molecular sieve after absorbing a certain amount of water needs to be regenerated regularly. Also, there is a phase change of aldehyde during the regeneration process. The surface polymerization of the equipment and the molecular sieve ceramic ball is serious, and the dehydration performance of the molecular sieve covered by the polymer is reduced. The molecular sieve should be replaced again. As a result, the amount of molecular sieves used is relatively large, and the amount of aldehydes treated by this dehydration method is limited, and large-scale industrial production is subject to certain restrictions.

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