Method and system for synthesizing N-methylaniline and co-producing N, N-dimethylaniline by gas phase method

The method and system for synthesizing N-methylaniline co-producing N,N-dimethylaniline through gas phase method solves the problems of low selectivity and conversion in the prior art, realizes continuous and stable operation and diversified product production, and reduces costs.

CN120398692APending Publication Date: 2025-08-01SOUTHWEST RES & DESIGN INST OF CHEM IND
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Patent Information

Application Number
CN202510545186.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-28
Publication Date
2025-08-01

AI Technical Summary

Technical Problem

In the prior art, the selective regulation range of N-methylaniline and N,N-dimethylaniline is not large. The reaction requires the addition of carrier gas such as nitrogen to increase the cost of raw materials and separation costs, and it is difficult to achieve high aniline conversion and continuous and stable operation.

Method used

The method and system for synthesizing N-methylaniline co-producing N,N-dimethylaniline is used to synthesize N,N-dimethylaniline by gas phase method, and the raw material gasification unit, reaction unit, separation and distillation unit and hydrogen recovery unit are connected through pipelines. The alkylation catalyst produced by Southwest Chemical Research and Design Institute Co., Ltd. is used to adjust the reaction conditions and feed ratio to achieve the synthesis and purification of N-methylaniline and N,N-dimethylaniline.

Benefits of technology

It has achieved continuous and stable operation, high single-way conversion of aniline and selective adjustment of N-methylaniline and N,N-dimethylaniline. It has diversified products, reduced raw material costs and energy consumption, and improved the company's ability to resist market risks.

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Abstract

The invention relates to a method and a system for synthesizing N-methylaniline and co-producing N, N-dimethylaniline by a gas phase method, and belongs to the technical field of chemical engineering. The system comprises a raw material gasification unit, a reaction unit, a separation and rectification unit and a hydrogen recovery unit which are connected through pipelines. The method comprises the following steps of: firstly, mainly synthesizing N-methylaniline from raw materials aniline and part of methanol in a first-methylaniline reactor, then partially or completely feeding first-methylaniline reaction gas into a second-methylaniline reactor, adding methanol steam, and further reacting to generate N, N-dimethylaniline. And after the product gas is subjected to heat exchange energy recovery, a liquid phase and a gas phase respectively enter the separation and rectification unit and the hydrogen recovery unit. The purification of N-methylaniline and N, N-dimethylaniline and the recovery of byproduct hydrogen are realized. The yield of N, N-dimethylaniline (in terms of aniline) can be adjusted in a range of 5-30% by adjusting reaction conditions and a feeding ratio.
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