Clean diethylamine production method

Abstract

The invention belongs to the field of industrial sewage disposal and relates to a clean diethylamine production method. According to the clean diethylamine production method for zero emission and resource recycle, through bipolar membranes in a bipolar membrane device, a diethylamine alkali liquid and a hydrochloric acid solution are obtained, the diethylamine alkali liquid is further subjected toevaporation treatment to obtain a product in which the content of diethylamine alkali reaches 99.0% or above, and the content of chloride ions is lower than 0.1%; the hydrochloric acid solution obtained from the bipolar membrane device is disposed by a first electrodialysis device to obtain a hydrochloric acid concentrated solution and a hydrochloric acid desalted solution; the hydrochloric acidconcentrated solution obtained from the first electrodialysis device is disposed by a second electrodialysis device to obtain a side product, namely a concentrated hydrochloric acid solution; the hydrochloric acid desalted solution obtained from the first electrodialysis device serves as a replenisher of a desalting chamber of the second electrodialysis device. Therefore, the method can not only achieve clean production of diethylamine but also have great social and economic benefits at the same time.

Description

technical field [0001] The invention belongs to the field of industrial sewage treatment and relates to a clean production method of diethylamine. Background technique [0002] Diethylamine is an important organic chemical raw material, which can be used in the synthesis of pharmaceutical and pesticide intermediates. In the process of synthesizing medicines with diethylamine as an intermediate, diethylamine hydrochloride wastewater with large water volume and high hydrochloric acid content is often produced. In order to reuse diethylamine in wastewater, the industry often adjusts the pH by adding alkali and then rectifying treatment. The wastewater produced in this process has the characteristics of high salt and low COD, and cannot be biochemically treated. At the same time, the process involves the addition of alkali, which requires a large dose of medicament and high cost. [0003] The bipolar membrane is a new type of ion-exchange composite membrane. Under the action o...

AI Technical Summary

Problems solved by technology

In order to reuse diethylamine in wastewater, the industry often adjusts the pH by adding alkali and then rectifies it. The wastewater produced in this process has the characteristics of high salt and low COD, and cannot be biochemically treated.

At the same time, the process involves the addition of alkali, which requires a large amount of dosage and high cost.

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