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Method for recycling dibasic acid byproducts from adipic acid waste liquor

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

Active Publication Date: 2012-10-24
CHINA TIANCHEN ENG +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to improve the treatment method of adipic acid waste liquid, improve evaporation efficiency, reduce energy consumption, solve the problem of vacuum breaking when cutting materials, and enable continuous operation of evaporation and concentration

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  • Method for recycling dibasic acid byproducts from adipic acid waste liquor

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Embodiment 1

[0033] A method for recovering dibasic acid by-products from adipic acid waste liquid. The adipic acid DBA waste liquid is sent to the preheater 1 by conveying and pumping, heated to 75°C with steam condensate, and then enters the rising film evaporator 2 for evaporation and concentration . The outlet temperature of the rising film evaporator 2 is controlled at 90°C and operated at -20~-40kPa A negative pressure. The steam discharged from the top of the rising film evaporator 2 is sent to the nitric acid concentration tower 5 to recover nitric acid together with the steam discharged from the top of the falling film evaporator 3 after the cyclone separator 4 separates the entrained liquid droplets. The moisture content in the output of the rising film evaporator 2 drops to about 40%, and flows to the falling film evaporator 3 for further evaporation and concentration. Falling film evaporator 3 is operated at -70kPaA, heated by medium-pressure steam, and the temperature of the ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C55/14C07C55/10C07C55/12C07C51/43
Inventor 汪浩王琳张进治张丰扬周曼琳
Owner CHINA TIANCHEN ENG
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