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Method for treating wastewater of dilute thiamine

A treatment method and technology for wastewater, which are applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of high treatment cost and high energy consumption of dilute ammonium sulfate wastewater

Active Publication Date: 2007-12-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there is a problem of high energy consumption or high treatment cost for the treatment of dilute ammonium sulfate wastewater in the prior art, and a new method for the treatment of dilute ammonium sulfate wastewater of acrylonitrile quenching process without reclaiming ammonium sulfate is provided. method

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  • Method for treating wastewater of dilute thiamine

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Embodiment 1

[0020] Adopt the flow process of Fig. 1, the weight percentage of one-stage acrylonitrile quenching dilute ammonium sulphate wastewater is composed of: acrylonitrile 0.19%, hydrocyanic acid 0.19%, water 78.36%, ammonium sulphate 13.82%, polymer 7.44%, wherein also contains a small amount of catalyst dust. After the waste water is separated from the solid and liquid by the hydrocyclone, the catalyst dust and most of the polymers are removed, and the mass composition of acrylonitrile 0.20%, hydrocyanic acid 0.20%, water 84.67%, ammonium sulfate 14.93% and trace polymers are obtained. liquid and adjust its pH value to 6.6. The clear liquid is stripped by 20 theoretical plate strippers. The top temperature of the stripper is 87.5°C and the temperature of the bottom of the tower is 110°C. The weight composition of the top of the tower is hydrogen An organic solution of 35% cyanic acid, 30% acrylonitrile, and 35% water. The ammonium sulfate solution with a concentration of 18% by we...

Embodiment 2

[0022] According to each step of embodiment 1 and operating condition, just change clear liquid pH value to be 7.5, resin exchange capacity is 0.5 millimole per gram of resin, draw out ammonium sulfate solution at the 4th column plate place side line at tower kettle top, increase stripping The extraction amount at the top of the tower is 10% of the raw material weight, and the mass composition of the top of the tower is 25% of hydrocyanic acid, 20% of acrylonitrile, and 55% of water. ammonium sulfate solution, the remaining feed waste water flows out from the tower kettle, and lime is added to ammonium sulfate to stir to produce dihydrate gypsum and ammonia water. After solid-liquid separation, the concentration obtained is dihydrate gypsum precipitation and the weight percentage concentration is 25%. of ammonia. The processing method of dihydrate gypsum and ammoniacal liquor is with embodiment 1.

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Abstract

This invention relates to a method for treating diluted ammonium sulfate wastewater. The method solves the problems of high solid waste and organic nitrile impurity contents, low ammonium sulfate concentration, and difficult ammonium sulfate recovery. The method comprises: (1) removing solid impurities from diluted ammonium sulfate wastewater, adjusting the pH value to 6.5-7.5, performing flash evaporation, stripping or rectification, removing lightweight organic fractions at the overhead, collecting heavy fractions at the bottom, and extracting the rest ammonium sulfate wastewater at 1st-5th theoretical plates from the overhead; (2) sending the rest ammonium sulfate wastewater to ion exchange reaction, and removing NH4+; (3) treating regenerated liquid of the ion exchange resin with Ca(OH)2 aqueous solution to produce CaSO4 and diluted ammonia solution, performing solid-liquid separation, reacting CaSO4 and diluted ammonia solution with CO2 to obtain ammonium carbonate or ammonium hydrogen carbonate.

Description

technical field [0001] The invention relates to a method for treating dilute ammonium sulfate wastewater, in particular to a method for treating dilute ammonium sulfate wastewater produced by a one-stage acrylonitrile quenching process. Background technique [0002] Most of the acrylonitrile production units in the world adopt the Schoio process of BP Company, and its market share reaches more than 95%. The process uses chemical grade propylene, fertilizer grade ammonia and air as raw materials (propylene in the feed: ammonia: air = 1: 1.2: 10), uses phosphorus-molybdenum-bismuth catalysts to produce acrylonitrile, and simultaneously produces acetonitrile and hydrogen. cyanic acid. The reactor is a fluidized bed, the reaction temperature is 400-500°C, and the pressure is 0.05-0.1MPa. [0003] The refining recovery process of acrylonitrile has an important influence on the product yield of acrylonitrile unit. Generally, the recovery and refining process in the acrylonitril...

Claims

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Application Information

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IPC IPC(8): C02F1/66C02F1/04C02F1/42C02F1/58C01F11/46C01C1/26
Inventor 肖剑钟禄平陈秀宏
Owner CHINA PETROLEUM & CHEM CORP
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