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Device for treating biurea condensation sewage generated from preparation of ADC (Azodicarbonamide) foaming agent with urea method and use method of device

A technology of ADC foaming agent and sewage treatment device, which is applied in the field of preparation of ADC foaming agent and biuret condensation sewage treatment device by urea method, can solve the problems of low resource reuse rate, large amount of oxidant use, and difficulty in reaching COD standards.

Active Publication Date: 2017-05-24
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to solve the technical problems that the COD in the wastewater is difficult to reach the standard, the amount of oxidant used is large, the oxidation cost is high, and the resource reuse rate is low in the current ADC foaming agent biurea condensation sewage treatment method, and provides a urea method for preparing ADC. Foaming agent biurea condensation sewage treatment device and its application method

Method used

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  • Device for treating biurea condensation sewage generated from preparation of ADC (Azodicarbonamide) foaming agent with urea method and use method of device
  • Device for treating biurea condensation sewage generated from preparation of ADC (Azodicarbonamide) foaming agent with urea method and use method of device
  • Device for treating biurea condensation sewage generated from preparation of ADC (Azodicarbonamide) foaming agent with urea method and use method of device

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specific Embodiment approach 1

[0026] Specific implementation mode one: see figure 1 , 2 And 3, the present embodiment is a kind of urea method to prepare ADC foaming agent biurea condensation sewage treatment device, specifically by evaporation crystallizer 2, condensate drainage pipeline 3, solid salt output pipeline 16, concentrated liquid output pipe Road 20, high-temperature salt bath decomposition and gas absorption system 15, main absorption liquid drainage pipe 18, first branch drainage pipe 13 of absorption liquid, second branch drainage pipe 14 of absorption liquid, ammonia rectification tower 12, ammonia water drainage pipe 5, First ammonia rectification tower bottom liquid drain pipe 11, second ammonia rectification tower bottom liquid drain pipe 10, pressurized hydrolysis-flash system 7, flash tank exhaust pipe 6, flash tank drain pipe 17 , an oxidation tank 8, an oxidation tank drain pipe 9, a cooling crystallization system 4 and a return line 19;

[0027] The evaporation crystallizer 2 is p...

specific Embodiment approach 2

[0030] Specific implementation mode two: see figure 1 , 2 And 3, the present embodiment is the urea method of specific embodiment one to prepare the using method of ADC blowing agent biurea condensation sewage treatment device, specifically as follows:

[0031] The diuret condensation sewage, which has been filtered to remove suspended solids by precipitation, enters the evaporation crystallizer 2 through the water inlet pipe 1 of the evaporation crystallizer 2. liquid reuse, a part of the condensed liquid is discharged up to standard after being treated, and the concentrated liquid obtained by evaporation, concentration and crystallization of sewage enters the cooling crystallization system 4 through the concentrated liquid output pipeline 20; when the chlorine in the concentrated liquid obtained by evaporation, concentration and crystallization of sewage When the concentration of ammonium chloride was less than the saturation solubility of ammonium chloride, return to the e...

specific Embodiment approach 3

[0041] Embodiment 3: The difference between this embodiment and Embodiment 2 is that sodium hydroxide is added to the concentrated solution discharged from the cooling crystallization system 4 to adjust the pH to 10. Others are the same as in the second embodiment.

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Abstract

The invention discloses a device for treating biurea condensation sewage generated from preparation of an ADC (Azodicarbonamide) foaming agent with a urea method and a use method of the device, relates to a sewage treatment device and a use method thereof, and aims to solve the problem that COD (Chemical Oxygen Demand) in effluent of the biurea condensation sewage generated when the ADC foaming agent is prepared by using the urea method is hard to meet standards. The device consists of an evaporation crystallizer, a high-temperature salt bath decomposition and gas absorption system and a pressure hydrolysis-flash evaporation system. The use method disclosed by the invention comprises the following steps: feeding sewage into the evaporation crystallizer, performing cooling crystallization on concentrated liquid, feeding into an ammonia distillation tower for ammonia distillation, discharging the bottom liquid of the ammonia distillation tower into the pressure hydrolysis-flash evaporation system for decomposition treatment, and feeding salt generated from evaporation crystallization into the high-temperature salt bath decomposition and gas absorption system for purification treatment. By adopting the device and the use method, urea and hydrazine hydrate of the ADC condensation sewage can be recycled, sodium chloride can be purified, the water circulation utilization rate can be increased, and standards of indexes such as COD in the effluent can be met.

Description

technical field [0001] The invention relates to a sewage treatment device for preparing ADC foaming agent biurea condensation by urea method and a use method thereof. Background technique [0002] ADC foaming agent (chemical name azodicarbonamide, English azodicarbonamide, abbreviated as ADC) is a foaming agent commonly used in industry, and can also be used in the food industry. [0003] According to the production method of intermediate raw material hydrazine hydrate, the ADC production process can be divided into three methods: Raschig method (also known as chloramine method), ketazine method and urea method. Enterprise adoption. The urea method to produce ADC blowing agent comprises three processes (or steps): the first step is that urea is oxidized to hydrazine hydrate by sodium hypochlorite under alkaline conditions, producing sodium chloride and sodium carbonate simultaneously, and sodium carbonate is separated through low-temperature crystallization; The second par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/06C02F1/66B01D53/78B01D53/68C01C1/16C02F101/16C02F101/30
CPCB01D53/68B01D53/78C01C1/164C02F1/04C02F1/06C02F1/66C02F2101/16C02F2101/30C02F2201/007C02F2301/04
Inventor 刘广民李飘夏淑梅黄金李嘉琪刘成岩
Owner HARBIN ENG UNIV
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