Recovery method of heavily polluted substance produced in ADC foaming agent production process and its device

An ADC foaming agent and production process technology, which is applied in the field of recycling solid matter, can solve serious pollution and other problems, and achieve the effects of low equipment investment, good economic and social benefits, and simple process

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

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Problems solved by technology

[0022] The purpose of the present invention is to overcome the severe pollution problem existing in the production of ADC foaming agent with crude hydrazine in the prior art, and provide a kind of by-product pollutant in the ADC foa

Method used

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  • Recovery method of heavily polluted substance produced in ADC foaming agent production process and its device
  • Recovery method of heavily polluted substance produced in ADC foaming agent production process and its device
  • Recovery method of heavily polluted substance produced in ADC foaming agent production process and its device

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Embodiment 2

[0122] Such as figure 2 The recovery device for serious pollutants in the production process of ADC blowing agent shown includes equipment such as: neutralizing hydrazine metering tank 1, freezing pot 2, centrifuge A, condensation pot 3, centrifuge B, evaporation tank 4, centrifuge C, the second freezing pot 5, centrifuge D, Glauber's salt storage tank 6, biurea storage tank 7, sodium chloride storage tank 8, ammonium chloride storage tank 9, second evaporation tank 10, centrifuge E, drying Furnace 11, agitator 12, feed pump 13 and valve 14.

[0123] The connection mode of these equipments is as follows: neutralizing hydrazine metering tank 1 is equipped with stirrer 121, is communicated with freezing pot 2 by feeding pump 131 and valve 141, and freezing pot 2 is equipped with stirrer 122, is connected with centrifuge by pump 132 and valve 142 A is connected, the solid discharge port of centrifuge A is connected with Glauber's salt storage tank 6, the filtrate discharge port...

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Abstract

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

Description

technical field [0001] The invention relates to a method and device for recovering solid matter from liquid through evaporation and freeze crystallization, in particular to a method and device for recovering serious pollutants in the production process 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 my country. 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 f...

Claims

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Application Information

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IPC IPC(8): C07C233/01C07C245/04C08J11/02C08K5/20C09K23/00
Inventor 郑守樽郑敏榕
Owner 郑守樽
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