A kind of method for extracting and rectifying purifying and refining triethylamine

Abstract

The invention provides a method for refining trimethylamine through extractive distillation and purification. The method comprises an extractive distillation tower and an extracting agent recovery tower which are connected front and back, wherein a raw material containing trimethylamine enters the extractive distillation tower from the middle of the extractive distillation tower, an extracting agent enters the extractive distillation tower from the middle-upper part of the extractive distillation tower, a high-purity trimethylamine product is extracted from the top of the extracting agent recovery tower, an extracting agent and water enter the extracting agent recovery tower after being extracted from the bottom of the extractive distillation tower, water is extracted from the top of the extracting agent recovery tower, and the extracting agent is recycled after being extracted from the bottom of the extracting agent recovery tower. Trimethylamine containing water is purified and refined with the extractive distillation method adopting dimethyl sulfoxide as an extracting agent, the purity of trimethylamine can be 99% or above, the recovery rate of the product can be 99% or above, the purification refining operation of trimethylamine can be effectively completed, and the method has higher implement value and economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical mass transfer and separation, in particular to a method for purifying and refining triethylamine by using an extractive distillation method. Background technique [0002] Triethylamine is an amine organic compound, named N,N-diethylethylamine systematically. It is a colorless and transparent liquid with a strong ammonia odor and emits slight smoke in the air. The boiling point is 88.77°C, slightly soluble in water, soluble in ethanol and ether, and its aqueous solution is weakly alkaline. Flammable, explosive, toxic and highly irritating. In industry, it is mainly used as solvent, curing agent, catalyst, polymerization inhibitor, antiseptic and synthetic raw material. [0003] In modern industrial production, the separation and purification of triethylamine is usually processed by extractive distillation. Chinese patent CN105523889A discloses a method of extractive distillation of tert-butanol-...

AI Technical Summary

Problems solved by technology

However, for triethylamine aqueous solution, since triethylamine and water are partially miscible two-liquid system, it has the lowest melting temperature. When it is below 18.7°C, triethylamine is soluble in water, and above this temperature, it can only be slightly dissolved. Soluble in water, so the minimum azeotrope formed by triethylamine and water cannot be purified by conventional rectification methods, and ethylene glycol cannot convert triethylamine from the more polar ones due to its low polarity Effective extraction and separation in water

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