Combined production method

A technology of mixture and mixing temperature, applied in chemical instruments and methods, preparation of organic compounds, preparation of sulfonic acid, etc., can solve problems such as no co-production method, achieve resource saving, high yield and purity, and reduce production costs Effect

Inactive Publication Date: 2015-09-23
HEFEI ALL PLUS ENVIRONMENTAL TECH CO LTD
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Problems solved by technology

Although N-tert-butylacrylamide can be obtained as a small amount of impurity in the production of 2-acrylamido-2-methylpropanesulfonic acid, it has not been seen that these two substances are both used for production purposes and set up in the synthesis stage. Combined Production Method of Determining Comprehensive Optimization Conditions and Parameter Indexes

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Embodiment Construction

[0022] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 Shown, coproduction method of the present invention comprises the following steps:

[0024] (1) Fully mix acrylonitrile and concentrated sulfuric acid at a weight ratio of 5:1-2 to obtain mixture A. If the proportion of concentrated sulfuric acid is increased in the mixing ratio of acrylonitrile and concentrated sulfuric acid, the 2-acrylamide group in the final product will - The proportion of 2-methylpropanesulfonic acid increases, if the proportion of concentrated sulfuric acid is reduced, the proportion of product E in the final product increases; the mixing temperature of acrylonitrile and concentrated sulfuric acid is -5°C-20°C, the preferred mixing temperature It is 10°C-15°C.

[0025] (2) Fully mix mixture A and isobutene at a weight ratio of 13:1-3 to obtain mixture B with solid precipitation; the mixing temp...

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Abstract

The invention provides a combined production method which comprises the following steps: according to a weight ratio of acrylonitrile to concentrated sulfuric acid being 5:(1-2), sufficiently mixing acrylonitrile and concentrated sulfuric acid to obtain a mixture A; according to a weight ratio of the mixture A to isobutene being 13:(1-3), sufficiently mixing the mixture A and isobutene to obtain a mixture B, wherein a solid in the mixture B is precipitated; conducting solid-liquid separation on the mixture B to obtain a solid C and a filtration liquid D; drying the solid C to obtain a product E, namely 2-acrylamide-2-methylpropane sulfonic acid; distilling the filtration liquid D to obtain an acrylonitrile solution and a concentrated solution F through recovery; adding water of which the weight is the same as the concentrated solution F into the concentrated solution F to ensure that a solid is precipitated from the concentrated solution F, and then carrying out filtration to obtain a solid product G, namely N-tert-butyl acrylamide. The combined production method has the advantages that residues from the production of 2-acrylamide-2-methyl-1-propanesulfonic acid are utilized, so that resource conservation is realized, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a coproduction method. Background technique [0002] At present, the production of 2-acrylamido-2-methylpropanesulfonic acid is generally prepared by directly mixing acrylonitrile, sulfuric acid and isobutylene. The parameters of the production process are usually set for the only product, 2-acrylamido-2-methylpropanesulfonic acid. After the filtrate is distilled and recovered, some by-products produced in the production process enter the bottom of the kettle. After testing, it is found that the substances in the bottom of the kettle can produce N-tert-butylacrylamide after treatment. In traditional production, N-tert-butylacrylamide is generally obtained by mixing acrylonitrile and isobutylene through acid-catalyzed hydrolysis. 2-acrylamido-2-methylpropanesulfonic acid and N-tert-butylacrylamide are completely different substances, and their industrial production is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/15C07C303/06C07C233/09C07C231/12C07C231/06
Inventor 李辉王建民
Owner HEFEI ALL PLUS ENVIRONMENTAL TECH CO LTD
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