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Recovery method of heavily polluated substance produced during production of foaming agent and device

A technology of ADC foaming agent and recovery method, which is applied in chemical instruments and methods, transportation and packaging, chemical/physical processes, etc., can solve the serious pollution of ADC foaming agent, achieve good economic and social benefits, and eliminate Effects of contamination, ease of separation

Inactive Publication Date: 2004-07-21
郑守樽 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0027] The purpose of the present invention is to overcome the severe pollution problem in the production of ADC blowing agent with crude hydrazine in the prior art, and provide a recovery method and device for serious pollutants produced during the production of ADC blowing agent, which can be used for ADC The by-product pollutants in the foaming agent production process are fully recycled, completely eliminating pollution and reducing the production cost of ADC foaming agent

Method used

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  • Recovery method of heavily polluated substance produced during production of foaming agent and device
  • Recovery method of heavily polluated substance produced during production of foaming agent and device
  • Recovery method of heavily polluated substance produced during production of foaming agent and device

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Embodiment 2

[0101] Such as figure 2 The recovery method of pollutants in the production process of the shown ADC blowing agent,

[0102]1. When the evaporation method reclaims sodium chloride, a large amount of sodium chloride crystallizes out when the volume of the first filtrate decreases by 60% in the evaporation tank 3, and the ammonium chloride is nearly saturated. Import the centrifuge for centrifugation, and open the centrifuge C, cut 104, Feed pump 94, carry out drying and dehydration, when the second filter cake sodium chloride accounts for centrifuge C capacity 70~80%, stop feed pump 94, cut off 104, use hot water in centrifuge C to second filter cake Wash until the ammonium chloride content of the second filter cake is lower than 0.05%, stop the centrifuge C, and go out the second filter cake to the sodium chloride storage tank 6;

[0103] 2. When freezing and reclaiming ammonium chloride, the temperature of the second filtrate in the freezing pot 4 is imported to a centrifug...

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Abstract

A process for recovering the main pollutants generated during production of foaming agent ADC includes condensation between hydrazine solution and urea, filtering to obtain biurea and the first filtrate, evaporating the first filtrate, centrifugal separating to obtain sodium chloride and the second filtrate, freezing the second filtrate to 10- -5 deg.C, centrifugal separating to obtain ammonium chloride and the third filtrate, evaporating the third filtrate several times, freezing to obtain the crystal of sodium chloride or ammonium chloride, and returning the residual mother liquid back to condensater.

Description

technical field [0001] The invention relates to a method and device for recovering solid matter from liquid through evaporation and freezing crystallization, in particular to a method and device for recovering serious pollutants produced during the production of ADC foaming agent. Background technique [0002] ADC foaming agent (hereinafter referred to as ADC) is widely used in the plastic and rubber industry, and is the most widely used and the largest output among foaming agents. However, there used to be two major problems in the source of raw materials that hindered the development of ADC production in China. One was the oxidant red alum sodium, and the other was pure hydrazine hydrate. Therefore, the present inventor studied in Fuzhou No. 1 Chemical Plant in 1966 and adopted chlorine oxidation method to replace red alum sodium method to produce ADC, and proposed to replace pure hydrazine with crude hydrazine to produce ADC again in 1970, and its production process is as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/01C07C245/04C08J11/02C08K5/20C09K23/00
Inventor 郑守樽郑敏榕
Owner 郑守樽
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