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Chlorohydrination tail gas coupling treatment method

A treatment method, chloroalcoholization technology, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve problems such as cumbersome operation, high energy consumption, and easy flash explosion

Pending Publication Date: 2020-10-27
南京佳华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most of the methods at home and abroad use alkali washing, incineration, deep cooling, and blowing air to dilute the tail gas of chloroalcoholization, which has poor effect, high energy consumption, high risk factor, and will produce highly toxic dioxins.
[0006] Chinese patent CN210495775U discloses a cryogenic plus activated carbon fiber or activated carbon adsorption treatment system for chemical tail gas. Alkaline washing-cryogenic-activated carbon adsorption is used to treat chemical tail gas. The adsorbent needs to be frequently replaced and regenerated, and the operation is cumbersome.
Chinese patent CN209569741U discloses a system for the treatment of chemical waste gas. It adopts the treatment method of alkali washing plus dilution and incineration.
Chinese patent application CN104607024A discloses a treatment method for acid-containing tail gas of chlorohydrinization reaction. The method of alkali washing-reaction-water washing can only remove acid gas and propylene, and only have a treatment effect on tail gas with high propylene content. Applicable to other exhaust gases with low propylene content and complex components

Method used

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  • Chlorohydrination tail gas coupling treatment method
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  • Chlorohydrination tail gas coupling treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] like figure 1 As shown, a chloroalcoholization tail gas coupling treatment system is an alkali washing + compression condensation + membrane separation coupling treatment system, including: an alkali washing tower 1 for removing acid gases in the chlorohydrinization tail gas; a compression cooling device, including a liquid ring Compressor 2, cooler 3 and gas-liquid separator 4 are used to separate relatively high-boiling dichloropropane and chloropropanol from low-boiling nitrogen, oxygen, propane, and propylene; membrane separation device 5 is used for macromolecule Separation of propane, propylene and small molecules of nitrogen and oxygen; cryogenic equipment.

[0053] The bottom of the alkali washing tower 1 is provided with an air inlet, the top is provided with a liquid inlet, the bottom is provided with a liquid outlet, and the top is provided with an air outlet; The liquid port is connected; the top gas outlet of the alkali washing tower 1 is connected to the ...

Embodiment 2

[0064] like figure 2 As shown, a chlorohydrinization tail gas coupling treatment system is a solid alkaline substance absorption-pressurized rectification-membrane separation coupling treatment system, including: a solid alkaline substance absorption tower 6, which is used to convert HCl and Cl in the tail gas 2 and water vapor are removed; pressurized rectification tower 7 is used to separate low-boiling propylene, propane, nitrogen, oxygen and high-boiling dichloropropane and chloropropanol in the remaining tail gas; membrane separation device 5 is used for propane, propylene Separation from nitrogen and oxygen; cryogenic equipment.

[0065] The bottom of the solid alkaline absorption tower 6 is provided with an air inlet, and the top is provided with an air outlet, and solid KOH is filled in the solid alkaline absorption tower 6; The inlet of the pressurized rectification tower 7 is connected, the bottom of the pressurized rectification tower 7 is equipped with a reboiler...

Embodiment 3

[0076] like image 3 As shown, a chlorohydrinization tail gas coupling treatment system system is a solid alkaline substance absorption-strong polar solvent absorption-weak polar solvent absorption coupling treatment system, including: a solid alkaline substance absorption tower 6 for removing the exhaust gas HCl, Cl 2 and water vapor; the first solvent absorption tower 10 is used to separate non-polar propylene, propane, nitrogen, oxygen and highly polar dichloropropane and chloropropanol; the second solvent absorption tower 11 is used to separate propylene, propane With nitrogen, oxygen; regeneration tower 12, used for weak polar solvent circulation regeneration.

[0077] The bottom of the solid alkaline substance absorption tower 6 is provided with an air inlet, and the top is provided with an air outlet, and solid NaOH is filled in the solid alkaline substance absorption tower 6; the gas outlet at the top of the solid alkaline substance absorption tower 6 is connected to ...

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Abstract

The invention belongs to the field of tail gas treatment and discloses a chlorohydrination tail gas coupling treatment method. The method comprises the following steps of: firstly, absorbing chlorohydrination tail gas by alkali liquor or solid inorganic alkali or alkaline-earth metal oxide to remove acid gas, then separating chloropropanol and dichloropropane by compression condensation or pressurized rectification or solvent absorption, and finally separating propylene, propane, nitrogen and oxygen by membrane separation equipment or solvent absorption. Through coupling of multiple methods, targeted treatment is conducted according to different physical properties of components in the tail gas, harmful gas is thoroughly removed, the emission standard is achieved, meanwhile, propane and propylene are deeply recycled, and the recycling rate of propane and propylene reaches 90% or above.

Description

technical field [0001] The invention belongs to the field of tail gas treatment, and relates to a chloroalcoholization tail gas coupled treatment method, in particular to a method for recovering propylene and propane from acidic chloroalcoholization tail gas containing dichloropropane, propylene and propane and meeting emission standards after treatment. Background technique [0002] Dichloropropane (English name: propylene dichloride, C 3 h 6 Cl 2 ) has two isomers, namely 1,2-dichloropropane and 1,3-dichloropropane. Chloropropane is a colorless transparent liquid with chloroform smell, insoluble in water, soluble in most organic solvents such as acetone and ether. It can be used as raw material for organic synthesis, oil and fat solvent, detergent, resin and pesticide. [0003] 1-Chloro-2-propanol (English name: 1-Chloro-2-propanol, C 3 h 7 ClO) is a colorless liquid with a slight ether odor, soluble in water and ethanol, used to manufacture propylene oxide and propy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/40B01D53/78B01D53/81B01D53/00B01D53/18B01D53/22C10L3/12F23G7/06
CPCB01D53/40B01D53/78B01D53/81B01D53/002B01D53/005B01D53/18B01D53/1487B01D53/1406B01D53/228B01D53/229C10L3/12F23G7/06B01D2251/30B01D2251/40B01D2251/602B01D2251/304B01D2251/306B01D2251/404B01D2251/604B01D2252/205B01D2252/202B01D2252/103B01D2258/02
Inventor 张扬谢佳华黄小康赵怡刘琼
Owner 南京佳华科技股份有限公司
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