Method for implementing co-production of ammonium sulfate from ADC foaming agent wastewater by extracting hydrazine hydrate

A technology of ADC foaming agent and hydrazine hydrate, which is applied in the field of purifying hydrazine hydrate to realize the co-production of ammonium sulfate from waste water of ADC foaming agent. Effect

Active Publication Date: 2012-12-19
NINGXIA RISHNEG HIGH NEW IND CO LTD
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Application number 03132081.3, date of application 2003.07.15, name is recovery method and device for serious pollutants in the production process of ADC foaming agent, application number 200510017886.1, date of application 2005.08.12, name is synthesis process of biurea; the above two patents The technology uses hydrochloric acid or hydrogen chloride gas instead of sulfuric acid to produce ADC foaming agent, and the obtained wastewater contains two inorganic salts of sodium chloride and ammonium chloride, and then recovers the above two salts from the wastewater to achi

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] A method for purifying hydrazine hydrate to realize co-production of ammonium sulfate from ADC blowing agent wastewater, characterized in that: the method is to preheat the crude hydrazine hydrate solution step by step to 90°C through the condensed water of each effect, and then enter each effect evaporator in parallel for heating Evaporation, during the evaporation process, hydrazine hydrate and water volatilize to form mixed steam, which is transported from the top of the evaporator to each effect absorption tower through pipelines, and the crystallized sodium chloride and sodium carbonate monohydrate particles deposited in the evaporation process are deposited at the bottom of the evaporator and discharged through the salt discharge pipe , the hydrazine-containing mixed steam produced by each effect evaporator is transported to the lower part of the absorption layer of this effect absorption tower through pipelines, and flows along the absorption layer from bottom to t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for coproducing ammonium sulfate from wastewater, in particular to a method for implementing co-production of ammonium sulfate from ADC foaming agent wastewater by extracting hydrazine hydrate. The method comprises the following steps that after being preheated step by step by condensate water with each effect, hydrazine hydrate coarse solution enters evaporator with each effect in parallel to be heated and evaporated; after settling and being pulped, saline-alkali pulp discharged by evaporator with each effect through a pipeline is subjected to centrifugal dewatering to obtain saline-alkali slags; centrifugal mother liquid is settled to obtain clear liquid returned to a hydrazine hydrate coarse solution storage tank; the saline-alkali slags are pulped by saturated liquid and are respectively made into salt pulp and alkali pulp by multiple gravity fractionations; and the salt pulp and alkali pulp are respectively subjected to centrifugal dewatering to obtain salt slags and alkali slags. According to the invention, the process is unique and the ADC foaming agent production wastewater only contains a mass of ammonium sulfate, so that the aim of treating the wastewater pollution of an ADC foaming agent is fulfilled.

Description

technical field [0001] The invention relates to a method for co-producing ammonium sulfate from waste water, in particular to a method for purifying hydrazine hydrate to realize the co-production of ammonium sulfate from ADC foaming agent waste water. Background technique [0002] Application number 03132081.3, date of application 2003.07.15, name is recovery method and device for serious pollutants in the production process of ADC foaming agent, application number 200510017886.1, date of application 2005.08.12, name is synthesis process of biurea; the above two patents The technology uses hydrochloric acid or hydrogen chloride gas instead of sulfuric acid to produce ADC foaming agent, and the obtained wastewater contains two inorganic salts of sodium chloride and ammonium chloride, and then recovers the above two salts from the wastewater to achieve the purpose of wastewater treatment; application number 200610085350.8 , application date 2006.06.12, name is ADC blowing agen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B21/16C07C281/20C01C1/24
Inventor 柯超前
Owner NINGXIA RISHNEG HIGH NEW IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap