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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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Example Embodiment

[0046] Example 1

[0047] This embodiment is used to illustrate the use of figure 2 The method shown, using salty wastewater and CO 2 The method of co-production of soda ash and hydrochloric acid.

[0048] Using synthetic salt-containing wastewater as raw water to simulate wastewater discharged from coal chemical companies, the water quality parameters are shown in Table 1.

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

[0050] (2) Set the flow rate to 3.4m 3 / h of reverse osmosis concentrated water is subjected to nanofiltration treatmen...

Example Embodiment

[0061] Example 2

[0062] This embodiment is used to illustrate the use of image 3 The method shown, using salty wastewater and CO 2 The method of co-production of soda ash and hydrochloric acid.

[0063] (1) Set the flow rate to 11m 3 / h The synthetic salt-containing wastewater described in Table 1 is subjected to reverse osmosis treatment, and the flow rate is 7m 3 / h product water and flow rate is 4m 3 / h of reverse osmosis concentrated water with a NaCl concentration of 110g / L, the product water is returned to the production system for recycling. The conditions of 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 of reverse osmosis concentrated water for nanofiltration treatment, the flow rate is 1.1m 3 / h of rich divalent salt brine and flow rate of 2.9m 3 / h NaCl concentration is 105g / L monovalent salt-rich brine. Add 0.0005wt% of the fl...

Example Embodiment

[0073] Example 3

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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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