Method for recovering hydrogen chloride gas in production process of chlorodifluoromethane and device

A technology of difluorochloromethane and hydrogen chloride gas, which is applied in the direction of chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, etc., which can solve problems such as corrosion, seriousness, and impact on the environment and human health, and achieve the effect of avoiding volatilization

Active Publication Date: 2009-12-30
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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Problems solved by technology

However, hydrogen chloride gas is a volatile gas. In the process of absorbing into hydrochloric acid, part of the gas will inevitably volatilize, which will seriously affect the environment and personal health. M

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  • Method for recovering hydrogen chloride gas in production process of chlorodifluoromethane and device

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Embodiment Construction

[0015] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0016] Such as figure 1 As shown, a device for recovering hydrogen chloride gas from the production of chlorodifluoromethane includes a hydrogen chloride rectification tower 1, a condenser 2 and a defluorination device 3, wherein the condenser 2 is connected at the top of the hydrogen chloride rectification tower 1 , its liquid phase outlet is connected to the rectification tower reboiler 6 near the bottom of the rectification tower 1, its gas phase outlet is connected to the defluorination device 3, and the defluorination device 3 includes 2 parallel sleeve heaters 4 and 2 parallel A defluorination tower 5 filled with a defluorination agent.

[0017] When in use, the or...

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Abstract

The invention discloses a method for recovering hydrogen chloride gas in production process of chlorodifluoromethane. The organic mixture of hydrogen chloride obtained in the chlorodifluoromethane production process and chlorodifluoromethane is led into a hydrogen chloride rectifying tower; after rectifying, hydrogen chloride is discharged from the top of the tower; the obtained hydrogen chloride is condensed to obtain liquid-phase hydrogen chloride and gas-phase hydrogen chloride, wherein, the liquid-phase hydrogen chloride flows back to the rectifying tower, and trace of fluorinion of the gas-phase hydrogen chloride is removed by a subsequent defluorination device so as to obtain hydrogen chloride gas. The invention can effectively recover by-product hydrogen chloride gas in the chlorodifluoromethane production process and comprehensively utilize hydrogen chloride gas to make waste profitable; in addition, the invention prevents parts of hydrogen chloride gas from volatilizing, prevents hydrochloric acid from polluting ambient environment and prevents hydrochloric acid from corroding devices and ducts.

Description

technical field [0001] The invention relates to a method and a device for recovering hydrogen chloride gas from the production of chlorodifluoromethane. Background technique [0002] In the process of producing chlorodifluoromethane by using chloroform and anhydrous hydrofluoric acid under the action of catalyst antimony pentachloride, a large amount of by-product HCl is produced, which is 0.84 times that of the product chlorofluoromethane. At present, it is commonly used to carry out three-stage absorption of hydrogen chloride gas by water absorption method, and absorb it into low-concentration hydrochloric acid for sale or treatment. However, hydrogen chloride gas is a volatile gas. In the process of absorbing into hydrochloric acid, part of the gas will inevitably volatilize, which will seriously affect the environment and personal health. Moreover, hydrochloric acid will seriously corrode the surrounding environment, equipment and pipelines. At the same time, the hydroge...

Claims

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Application Information

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IPC IPC(8): C01B7/07
Inventor 谢学端曾本忠谭梅芳陈炯张金刚余道腾
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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