Method for refining byproduct hydrogen chloride during production process of organochlorine products

A hydrogen chloride gas, production process technology, applied in chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, chemical instruments and methods, etc.

Inactive Publication Date: 2008-06-18
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with activated carbon and other adsorbents, the artificially synthesized polymer-adsorbent resin has the advantages of high mechanical strength, adjustable pore structure, and easy regeneration. There have been many engineering applications in organic wastewater treatment, but it is used for There is no report on the purification of by-product hydrogen chloride gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The benzene saturated steam obtained by the bubbling method is mixed with hydrogen chloride gas to obtain hydrogen chloride gas containing benzene 32.667mg / L, which is passed into a glass adsorption column (Φ1.5cm×20cm) equipped with 2g NDA-201 adsorption resin for adsorption, controlled The adsorption temperature is 30° C., and the gas flow rate is 0.1 L / min. After being adsorbed by NDA-201 resin, the concentration of benzene in hydrogen chloride gas is reduced to 0.005mg / L, and the working adsorption capacity of the resin is 309mg / g resin.

[0017] The above-mentioned adsorbed benzene resin was desorbed and regenerated with saturated water vapor at 120° C., and 0.611 g of benzene could be recovered by condensation of the desorbed liquid, and the desorption rate reached 98.9%.

Embodiment 2

[0019] The adsorption temperature in Example 1 was changed to 45°C, and other conditions were the same, the adsorption effect remained basically unchanged, the concentration of benzene in the hydrogen chloride gas was reduced to 0.006mg / L after adsorption, and the working adsorption capacity of the resin was 294mg / g resin.

Embodiment 3

[0021] The adsorption temperature in Example 1 was changed to 60° C., and other conditions remained unchanged. After being adsorbed by NDA-201 resin, the concentration of benzene in hydrogen chloride gas is reduced to 0.012mg / L, and the working adsorption capacity of the resin is 254mg / g resin.

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PUM

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Abstract

The utility model relates to a refining method of by-product HCl gas in organic chlorine production process, the by-product HCl gas passes by the absorption post filled with absorption resin at flow speed of 0.1-0.5m/s under constant-temperature constant-pressure, the removal ratio of the organic in the HCl gas can reach 99.8 percent, afterwards the absorption resin that absorbs the organic is desorbed by 110-160 DEG C saturation vapor, the desorption ratio can exceed more than 99 percent, the desorption liquid is condensed, oil-gas separated, recycled to obtain the organic mixture containing benzene or chlorobezene, the mixture is furthermore distilled and separated to obtain the benzene or chlorobezene, finally the absorption resin after desorbed by the vapor is dried by 110-140 DEG C hot air, and then cooled to room temperature for next stage absorption. The absorption resin can be reused after desorption and regeneration.

Description

technical field [0001] The present invention relates to the refining method of by-product hydrogen chloride gas in the production process of organochlorine products, specifically, refers to the production process of organochlorine products such as chlorinated benzene, polyvinyl chloride, trichloroethylene, dichloromethane, dichloroethane, etc. A purification method for by-product hydrogen chloride gas. Background technique [0002] With the development of the chlor-alkali industry, the variety and quantity of chlorine products in my country are also increasing. In the production of many chlorine products (especially organic chlorine products), a large amount of by-product hydrogen chloride gas will be produced. These by-product hydrogen chloride gases contain more or less raw materials (unreacted), side reaction products or products, etc., which are used Therefore, it is restricted. The current treatment method of by-product hydrogen chloride gas is basically used to produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07B01D53/04
Inventor 龙超李启芬李爱民钱洪明胡大波刘鹏刘福强张全兴
Owner NANJING UNIV
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