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Method for separation of hydrogen chloride from mixed gas containing hydrogen chloride, method for separation and recovery of hydrogen chloride and application

A hydrogen chloride gas and mixed gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as difficult adsorption and separation, and achieve the effects of high purity, high boiling point, and high efficiency

Active Publication Date: 2019-04-12
ZHONGKE YIGONG XIAMEN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Exhaust gas pretreatment is mainly because the adsorption capacity of activated carbon to many gases is better than that of hydrogen chloride, so it is difficult for activated carbon to selectively adsorb and separate hydrogen chloride gas in the mixed gas.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) The tail gas (containing hydrogen chloride 69wt%, ethylene 20.7wt%, ethane 4.5wt%, acetylene 1.5wt%, vinyl chloride 4.3wt%) flow rate of ethane chlorination dehydrogenation is 1.5kg / h, from the bottom of the tower Pass into the spray tower (diethylene glycol flow rate is 2kg / h) with diethylene glycol as absorbent, the control absorption temperature is 80 ℃, obtains the colorless transparent diethylene glycol solution that hydrogen chloride concentration is 20wt% at the bottom of the still, tower At the top, a mixed gas of ethane, vinyl chloride, ethylene, and acetylene can be obtained.

[0036](2) the diethylene glycol solution that the concentration of hydrogen chloride is obtained at the bottom of the still is 20wt% is transferred to the hydrogen chloride desorption tower, and the control desorption temperature is 80 ℃, and the top of the tower obtains hydrogen chloride gas, and the concentration of HCl is 100 wt%, which is sent to the next process for use, the tow...

Embodiment 2

[0038] (1) The tail gas (containing 32wt% hydrogen chloride, 42wt% methane, 2wt% ethane, 15wt% ethylene, 9wt% acetylene) flow of methane chlorination is 1.2kg / h, and it is fed from the bottom of the tower to absorb diethylene glycol (diethylene glycol flow rate is 1.5kg / h) in the spray tower of agent, and control absorption temperature is 50 ℃, and obtaining hydrogen chloride concentration at the bottom of the still is the colorless and transparent diethylene glycol solution of 30wt%, and tower top obtains methane, ethane, Mixed gas of ethylene and acetylene.

[0039] (2) the diethylene glycol solution that hydrogen chloride concentration is obtained at the bottom of the still is 30wt% is transferred to the hydrogen chloride desorption tower, and the control desorption temperature is 100 ℃, and the hydrogen chloride gas that tower top obtains, HCl concentration is 100wt%, is sent to the next procedure to use, At the bottom of the tower, a colorless and transparent diethylene g...

Embodiment 3

[0041] (1) The mixed gas (12wt% of nitrogen, 3wt% of hydrogen, and 85wt% of hydrogen chloride) containing nitrogen, hydrogen and hydrogen chloride is 1.2kg / h, and is passed into the spray tower with diethylene glycol as absorbent from the bottom of the tower (diethylene glycol flow rate is 2kg / h), control absorption temperature is room temperature (20~25 ℃), the bottom of the kettle obtains the colorless and transparent diethylene glycol solution that hydrogen chloride concentration is 40wt%, and the tower top obtains the mixed gas of nitrogen and hydrogen.

[0042] (2) the diethylene glycol solution that hydrogen chloride concentration is obtained at the bottom of the still is 40wt% is transferred to the hydrogen chloride desorption tower, and the control desorption temperature is 150 ℃, and the hydrogen chloride gas that the tower top obtains, HCl concentration is 100wt%, is sent to the next procedure to use, At the bottom of the tower, a colorless and transparent diethylene ...

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PUM

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Abstract

The invention relates to a method for separation of hydrogen chloride from mixed gas containing hydrogen chloride, a method for separation and recovery of hydrogen chloride and application. The methodfor separation of hydrogen chloride adopts diethylene glycol as the absorbent to absorb hydrogen chloride in the mixed gas containing hydrogen chloride to obtain hydrogen chloride gas absorbed diethylene glycol and the residual gas phase. Through a lot of experiments, diethylene glycol is screened out as the absorption solvent of hydrogen chloride in the mixed gas, can selectively absorb and separate hydrogen chloride from the mixed gas at room temperature, and the solvent that absorbs hydrogen chloride of certain concentration can quickly desorb hydrogen chloride at certain temperature, andcan be recycled, thus efficiently and economically realizing separation and recovery of hydrogen chloride in the mixed gas.

Description

technical field [0001] The invention belongs to the field of chemical production, and in particular relates to a method for separating hydrogen chloride from a mixed gas containing hydrogen chloride, a method for separating and recovering hydrogen chloride and an application thereof. Background technique [0002] Hydrogen chloride is a colorless gas with a pungent odor. It often exists in the form of hydrochloric acid mist in the air. The aqueous solution of hydrogen chloride is hydrochloric acid, which has constant boiling point (the content of hydrogen chloride is 20.24%). When concentrated hydrochloric acid is heated and distilled, the distillate is hydrogen chloride gas containing a small amount of water. In the case of 0.1MPa, this distillation continues until the concentration decreases to 20.24%, and the temperature rises to 108.65°C. Therefore, it is impossible to completely remove hydrogen chloride in the solution by means of heating distillation. [0003] Hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18
CPCB01D53/18B01D2252/202B01D2257/2045
Inventor 刘星钟劲光
Owner ZHONGKE YIGONG XIAMEN CHEM TECH
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