Method for refinishing trimethylamine

A purification method and technology of trimethylamine are applied in the field of purification of high-purity trimethylamine, and can solve the problems of complicated operation and the like

Inactive Publication Date: 2003-01-08
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regarding the preparation method of high-purity trimethylamine, the method of adding carboxylat

Method used

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  • Method for refinishing trimethylamine
  • Method for refinishing trimethylamine
  • Method for refinishing trimethylamine

Examples

Experimental program
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Embodiment 1

[0030] Methanol and ammonia carry out gas phase contact reaction in the presence of zeolite catalyst, and the reaction product obtained after removing ammonia in the ammonia separation tower is obtained at a rate of 1000 kg / hour, containing 11.0% by mass of monomethylamine, 40.9% of dimethylamine, and trimethylamine. 8.5%, methanol 5.3% and water 34.3% aqueous solution. This aqueous solution is used as figure 1 Distillation was performed as indicated. First, remove the middle section of the aqueous solution of ammonia supply trimethylamine separation tower (0.35 meters in tower diameter, the packed column that number of theoretical plates is 30), supply water with 722.3 kilograms / hour rate above this supply section, and the pressure at the top of the tower is Distillation was carried out under the conditions of 0.7Mpa and a reflux ratio of 9.8 (the reflux ratio=reflux flow / (column top gas extraction+extract liquid volume)). The overhead gas at this time was circulated in the...

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Abstract

High-purity trimethylamine with reduced consumption energy cost is economically obtained by a simple distillation operation. The invention discloses a method for purifying trimethylamine, characterized in comprising the 1st step of vapor phase catalytic reaction between a methylamine mixture and/or methanol and ammonia in the presence of a zeolite catalyst to obtain a methylamine reaction mixture from which unreacted ammonia is separated in an ammonia separation column followed by subjecting the resultant methylamine reaction mixture to water extractive distillation in the 1st column (trimethylamine separation column) to obtain a crude trimethylamine, and the 2nd step of subjecting only a necessary amount of the crude trimethylamine to water extractive distillation in the 2nd column (trimethylamine purification column) to obtain the objective high-purity trimethylamine.

Description

technical field [0001] The present invention relates to the method for preparing trimethylamine by the gas phase contact reaction of methanol and ammonia. More specifically, the present invention relates to a method for refining high-purity trimethylamine suitable for electronic materials or pharmaceuticals, which reduces the consumption energy cost of the methylamine preparation method, improves economical efficiency. Background technique [0002] Methylamine is usually dehydrated and aminated with alumina, silica-alumina, etc. (Amine-シ ョ n) is produced by reacting methanol and ammonia in the gas phase at high temperature (about 400°C) in the presence of a solid acid catalyst. Typically, a mixture of dimethylamine, monomethylamine and trimethylamine is formed in this reaction. In addition, since the required amount of these methylamines is very small except for dimethylamine, after separating dimethylamine from the reaction product, it can be recycled and reused in the re...

Claims

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Application Information

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IPC IPC(8): C07C209/84C07C211/04
Inventor 星野学丹羽清信
Owner MITSUBISHI RAYON CO LTD
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