Method for achieving ammonium chloride cooperative production through ADC foaming agent wastewater by means of total-hydrochloric acid pure hydrazine hydrate condensation

A technology of ADC foaming agent and ammonium chloride, which is applied in the field of ADC foaming agent production process improvement and wastewater recycling, can solve the problems of ADC foaming agent production process improvement and unsolved problems, so as to reduce steam consumption and avoid pollution effect

Inactive Publication Date: 2016-03-23
NINGXIA RISHNEG HIGH NEW IND CO LTD
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Problems solved by technology

The second patented technology does not improve the production process of ADC foaming agent, but only achieves th...

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[0016] A method for realizing the co-production of ammonium chloride from ADC foaming agent wastewater by condensation of pure hydrazine hydrate with full hydrochloric acid, the method is to firstly prepare hydrazine-containing vapor from the crude hydrazine hydrate solution, and then pass the hydrazine-containing vapor through a rectification tower for rectification The hydrazine required for the production of ADC can be obtained. During the evaporation process, the crystallized sodium chloride and sodium carbonate particles are deposited at the bottom of the evaporator, separated by a centrifuge and sent to chlor-alkali for electrolysis. After rectification, hydrazine hydrate is obtained and then added to urea And the hydrochloric acid produced by oxidation in the post-process is used in the production of ADC foaming agent. The obtained wastewater only contains ammonium chloride. The ammonium chloride solution is heated to continuously evaporate the water in it, and after reac...

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Abstract

The invention relates to ADC foaming agent production technology improvement and waste water recycling, in particular to a method for achieving ammonium chloride cooperative production through ADC foaming agent wastewater by means of total-hydrochloric acid pure hydrazine hydrate condensation. The method comprises the steps that vapor containing hydrazine is prepared from a hydrazine hydrate coarse solution at first, then the vapor containing hydrazine is rectified through a rectifying tower to obtain pure hydrazine needed for producing ADC, crystallized sodium chloride and sodium carbonate particles in the evaporation process are deposited at the bottom of an evaporator, separated through a centrifugal machine and then fed to sodium carbonate for electrolysis, urea and hydrochloric acid produced through oxidation in follow-up working procedures are added into the hydrazine hydrate obtained after rectification to be used for production of an ADC foaming agent, the obtained waste water only contains ammonium chloride, water in the ammonium chloride solution is continuously evaporated through heating, and an ammonium chloride crystal is separated out after supersaturation is reached; the method is unique, the ADC foaming agent production wastewater is converted into the water solution only containing ammonium chloride, follow-up treatment is more simple, and the obtained product is higher in value.

Description

technical field [0001] The invention relates to the improvement of the production process of the ADC foaming agent and the recycling of waste water, in particular to a method for realizing the co-production of ammonium chloride from ADC foaming agent waste water through the condensation of pure hydrazine hydrate of full hydrochloride. Background technique [0002] Application number 03132081.3, application date 2003.07.15, name ADC foaming agent recovery method and device for serious pollutants in the production process; application number 200610085350.8, application date 2006.06.12, name ADC foaming agent wastewater treatment method and integrated device; Application number: 200510017886.1, date of application: 2005.08.12, name Biurea synthesis process. The above first and third patented technologies use hydrochloric acid or hydrogen chloride gas instead of sulfuric acid to produce ADC foaming agent. The resulting wastewater contains two inorganic salts, sodium chloride and...

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Application Information

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IPC IPC(8): C01B21/16C01D3/14C01D7/24C01C1/16
CPCC01B21/16C01C1/164C01D3/14C01D7/24
Inventor 柯超前
Owner NINGXIA RISHNEG HIGH NEW IND CO LTD
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