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Method for producing sodium carbonate with salt-containing wastewater and CO2

A technology for salty wastewater and CO2, applied in chemical instruments and methods, products, chlorine/hydrogen chloride, etc., to solve the pressure of carbon emission reduction and improve economy.

Inactive Publication Date: 2017-05-17
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are currently no concrete and feasible solutions for how to convert crystallized salt into non-hazardous waste through pretreatment

Method used

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  • Method for producing sodium carbonate with salt-containing wastewater and CO2
  • Method for producing sodium carbonate with salt-containing wastewater and CO2
  • Method for producing sodium carbonate with salt-containing wastewater and CO2

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This example is used to illustrate the use of figure 2 The method shown, using saline wastewater and CO 2 A method for the joint production of soda ash and hydrochloric acid.

[0048] Synthetic saline wastewater was used as the raw water to simulate the wastewater discharged from coal chemical enterprises, and its water quality parameters are shown in Table 1.

[0049] (1) Set the flow rate to 10m 3 / h of the above-mentioned synthetic saline wastewater is treated by reverse osmosis, and the obtained flow rate is 6.6m 3 / h product water and flow rate is 3.4m 3 Reverse osmosis concentrated water with a NaCl concentration of 100g / L per hour returns the product water to the production system for recycling. The conditions for reverse osmosis treatment include: pressure of 5MPa, temperature of 30°C, membrane pore size of 0.5nm, membrane material For cellulose acetate.

[0050] (2) Set the flow rate to 3.4m 3 / h reverse osmosis concentrated water is treated by nanofiltr...

Embodiment 2

[0062] This example is used to illustrate the use of image 3 The method shown, using saline wastewater and CO 2 A method for the joint production of soda ash and hydrochloric acid.

[0063] (1) Set the flow rate to 11m 3 The synthetic saline waste water described in Table 1 of / h is subjected to reverse osmosis treatment, and the obtained flow rate is 7m 3 / h of product water and a flow rate of 4m 3 Reverse osmosis concentrated water with a NaCl concentration of 110g / L per hour returns the product water to the production system for recycling. The conditions for reverse osmosis treatment include: pressure of 5.2MPa, temperature of 28°C, membrane pore size of 0.5nm, membrane The material is cellulose acetate.

[0064] (2) Set the flow rate to 4m 3 / h reverse osmosis concentrated water is treated by nanofiltration, and the flow rate is 1.1m 3 / h of rich divalent salt brine and a flow rate of 2.9m 3 The concentration of NaCl / h is 105g / L rich monovalent salt brine. Adding ...

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Abstract

The invention relates to the field of coal chemical engineering wastewater treatment, and discloses a method for producing sodium carbonate with salt-containing wastewater and CO2. The method comprises the following steps: (1) performing separation treatment on the salt-containing wastewater so as to remove divalent salts in the salt-containing wastewater and obtain mono-valent salt enriched salt-containing water; (2) in the presence of an accelerant and CO2, performing carbonization treatment on the mono-valent salt enriched salt-containing water so as to obtain a sodium bicarbonate precipitate and carbonization mother liquor; (3) performing calcining treatment on the sodium bicarbonate precipitate, thereby obtaining sodium carbonate. By adopting the method disclosed by the invention, CO2 discharged from coal chemical industry production can be successfully used in the salt-containing wastewater treatment process, and besides the difficulty in treating NaCl with a low additional value in the salt-containing wastewater, and great carbon emission reduction burden can be effectively solved, certain economic benefits can be made, and effective technical methods for achieving the purpose of zero emission of the salt-containing wastewater can be provided for enterprises of coal chemical industry and the like.

Description

technical field [0001] The invention relates to the field of coal chemical wastewater treatment, in particular, to a method of using salty wastewater and CO 2 A method of producing soda ash. Background technique [0002] In recent years, due to the dual constraints of water resources and water environment issues, domestic coal chemical projects have proposed zero-discharge wastewater solutions. Wastewater zero discharge is a design scheme based on a reasonable division of the water system, combined with the characteristics of wastewater, to achieve maximum treatment and reuse, and no longer discharged to natural water bodies in the form of wastewater. According to water quality and quantity, coal chemical industry wastewater is mainly divided into coal gasification organic wastewater and saline wastewater. Saline wastewater includes biochemical treatment standard wastewater and clean wastewater, and the total dissolved solids (TDS) content is 1-3g / L. The composition of sa...

Claims

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Application Information

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IPC IPC(8): C01D7/16C01D7/00C01B7/03
CPCC01B7/035C01D7/00C01D7/16Y02P20/10Y02P20/141
Inventor 赵兴雷李国涛马瑞张桐霍卫东
Owner CHNA ENERGY INVESTMENT CORP LTD
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