Preparation device and preparation method for high-purity hydrochloric acid production by monochlorodifluoromethane byproduct HCL

Abstract

The invention discloses a preparation method for high-purity hydrochloric acid production by monochlorodifluoromethane byproduct HCL. The preparation method includes: producing 31% hydrochloric acid; enabling the 31% hydrochloric acid in an intermediate tank I (11) and an intermediate tank II (12) to cyclically adsorb fluorine ions, free chlorine and organics through a circulating pump (13), an adsorption bed I (14) and an adsorption bed II (15); after sampling analysis is qualified, sending to a finished product tank (16) of 31% high-purity hydrochloric acid. The invention further discloses a preparation device for high-purity hydrochloric acid production by the monochlorodifluoromethane byproduct HCL. The preparation device is characterized by comprising a water washing tower (8), a primary falling film absorber (9), a secondary falling film absorber (10), an alkaline tower (17), the intermediate tank I (11), the intermediate tank II (12), the adsorption bed I (14) and the adsorption bed II (15).

Description

technical field [0001] The invention relates to a preparation method and a preparation device for producing high-purity hydrochloric acid by using HCL as a by-product of difluorochloromethane. Background technique [0002] The production of chlorodifluoromethane is based on chloroform and HF as raw materials. The two react in a fluorination reactor according to a certain ratio to form chlorodifluoromethane. The by-product is HCL, which is separated at the top of the tower through high-pressure and low-temperature rectification. Produce HCL, which contains 100-200PPm of HF, about 1.5% of F23, about 0.2% of F22, and 70-100PPm of free chlorine. The traditional process uses AL2O3 to absorb HF and then absorbs it with water to produce 31% hydrochloric acid because of its high impurity content. , the production of 31% hydrochloric acid has low added value and does not meet the requirements of environmental protection. Contents of the invention [0003] The invention provides a ...

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Problems solved by technology

[0002] The production of chlorodifluoromethane is based on chloroform and HF as raw materials. The two react in a fluorination reactor according to a certain ratio to form chlorodifluoromethane. The by-product is HCL, which is separated at the top of the tower through high-pressure and low-temperature rectification. Produce HCL, which contains 100-200PPm of HF, about 1.5% of F23, about 0.2% of F22, and 70-100PPm of free chlorine. The traditional process uses AL2O3 to absorb HF and then absorbs it with water to produce 31% hydrochloric acid because of its high impurity content. , the production of 31% hydrochloric acid has low added value and does not meet the requirements of environmental protection

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