GB/T 17923-1999
Replaced
T/CPCIF 0172-2021
Active
Group standards
T/CPCIF 0172-2021 Chlorine drying waste sulfuric acid treatment in the chlor-alkali industry by concentration method
T/CPCIF 0172-2021 Chlorine drying waste sulfuric acid treatment in the chlor-alkali industry by concentration method
Price:
$ 20.00
Basic Information
Standard Code:
T/CPCIF 0172-2021
Standard Type:
Group standards
Standard Status:
Active
is_force_gb:
no
CCS Name:
Environmental protection
ICS Name:
Liquid waste, sludge
Publish Date:
2021-12-30
Implement Date:
2022-04-01
Scope
Scope: This document specifies the treatment method (concentration method) and environmental protection requirements for waste sulfuric acid from chlorine gas drying in the chlor-alkali industry. This document applies to the treatment of about 75% chlorine-containing waste sulfuric acid generated during the electrolysis of sodium chloride and potassium chloride by the concentration method after removing chlorine gas with concentrated sulfuric acid. Main technical content: 4. Treatment method (concentration method) 4.1 Method summary: The treatment of waste sulfuric acid from chlorine gas drying in the chlor-alkali industry adopts the concentration method, that is, one-stage and two-stage concentration in a vacuum concentration kettle to remove chlorine gas and produce sulfuric acid of different concentrations. The waste gas (chlorine gas, etc.) is distilled out in the vacuum concentration kettle and discharged after washing, cooling, and alkali absorption processes to meet emission standards. 4.2 Process flow: After filtration, the waste sulfuric acid with a concentration of about 75% is continuously fed into the first-stage concentration kettle at a certain flow rate. The absolute pressure in the kettle is controlled between 5 kPa and 20 kPa, and the temperature is 150 ℃ to 175 ℃. Steam with a pressure of 0.5 MPa to 1.0 MPa is used for vacuum concentration and distillation. The gaseous part enters the washing tower, and the liquid part is cooled and condensed to produce sulfuric acid with a concentration of not less than 80%. For the second-stage concentration, the sulfuric acid concentration after the first-stage concentration should be not less than 85% before entering the second-stage concentration kettle. The absolute pressure in the kettle is controlled between 2 kPa and 5 kPa, and the temperature is 180 ℃ to 200 ℃. Steam with a pressure of 1.0 MPa to 1.6 MPa is used for vacuum concentration and distillation. The gaseous part enters the washing tower, and th
Development Information
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GB 18420.1-2009
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GB 18420.1-2009 Biological toxicity for pollutants from marine petroleum exploration and exploitation—Part 1:Grading
GB/T 18420.2-2009
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GB/T 18420.2-2009 Biological toxicity for pollutants from marine petroleum exploration and exploitation—Part 2:Test method
YS/T 119.12-2010
Active