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Deep dehydrating method for methylacrolein

A methacrolein and deep dehydration technology, applied in the separation/purification of carbonyl compounds, organic chemistry, etc., can solve the problems of reduced dehydration performance of molecular sieves, limitations of large-scale industrial production, large amount of molecular sieves, etc., to meet the needs of industrial production , Reduce energy consumption, simple operation process

Active Publication Date: 2017-06-30
齐翔华利新材料有限公司
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  • Abstract
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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.

Method used

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  • Deep dehydrating method for methylacrolein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix and stir methacrolein with a water content of 0.20% and fresh dehydrating agent at a mass ratio of 1:1, and then separate into layers after stirring evenly, and the water content in the aldehyde drops to 0.007%.

Embodiment 2

[0033] The methacrolein with a water content of 0.20% and the regenerated dehydrating agent are mixed and stirred at a mass ratio of 1:1, and the layers are separated after stirring evenly, and the water content in the aldehyde is reduced to 0.007%.

Embodiment 3

[0035] Mix and stir methacrolein with a water content of 0.20% and fresh dehydrating agent at a mass ratio of 1:0.75, and then separate into layers after stirring evenly, and the water content in the aldehyde drops to 0.08%.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/80C07C47/22
CPCC07C45/80C07C47/22
Inventor 钱庆安刘士华张云岩
Owner 齐翔华利新材料有限公司
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