Method for recycling dibasic acid byproducts from adipic acid waste liquor

A technology of dibasic acid and by-products, which is applied in the field of dibasic acid by-product extraction, can solve problems such as breaking vacuum, achieve the effect of increasing residence time and ensuring stable operation

CN102746139BActive Publication Date: 2014-11-05CHINA TIANCHEN ENG +1

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: CHINA TIANCHEN ENG
Publication Date: 2014-11-05

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Abstract

The invention relates to a method for recycling dibasic acid byproducts from adipic acid waste liquor, which comprises steps as follows: dibasic acid waste liquor is preheated by a preheater and enters a climbing film evaporator; the concentrated solution from the climbing film evaporator naturally flows to a falling film evaporator; the discharged material from the bottom of the falling film evaporator is in a molten state; after a seal tank is subjected to vacuum isolation, a safe evaporating tank is operated under normal pressure; and the liquor naturally flows to the safe evaporating tank to be buffered, and enters a flaker to form flakes, thereby obtaining the dibasic acid flake byproducts. Compared with the prior art, the invention enhances the evaporization efficiency, lowers the steam consumption, implements continuous operation of evaporative concentration of adipic acid waste liquor, implements continuous discharge to avoid the possibility of explosion due to overpressure of equipment, ensures the discharge requirement for water content and the stable operation of the flaker, can adapt to great incoming material fluctuation or steam pipe network fluctuation, reasonably utilizes the energy, and lowers the comprehensive energy consumption of the products.

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Description

technical field

[0001] The invention is a method for extracting dibasic acid by-products from adipic acid production waste liquid. Background technique

[0002] Adipic acid is produced by oxidation of cyclohexanol with nitric acid using copper and vanadium as catalysts. In the production of adipic acid, the generated waste liquid (DBA waste liquid) contains adipic acid, succinic acid, glutaric acid, water and nitric acid. The method of extracting dibasic acid by-products is to recover adipic acid, succinic acid and glutaric acid from mixed waste liquid.

[0003] At present, the methods for recovering adipic acid, succinic acid and glutaric acid from adipic acid waste liquid include batch evaporation tank method and two rising film evaporators operated in series.

[0004] But the problems with these two methods are:

[0005] 1. The evaporation efficiency of the evaporation tank is low and the steam consumption is large.

[0006] 2. For the vacuum operation of the evaporat...

Claims

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