SU1255562A1 - Method of purifying gaseous hydrogen chloride from organic impurities - Google Patents

Description

The invention relates to methods of cleaning HC1 gas from the use of organic substances, including organochlorine.

The purpose of the invention is to reduce the humidity of the security process.

Example 1. 43200 nm h: loric hydrogen containing 1.0% by volume of monochloroacetic acid is combusted with 6400 nm / h of oxygen and 8300 kg / h of sulfur are burned in this mixture at 1300 ° C, the burning gas containing sulfur after burning, nm / h: sulfur dioxide 5680; oxygen 75; carbon dioxide: gas 860; hydrogen chloride 43200; steam 430, cooled to 20-50 ° C, 5680 nm / h of chlorine is added and the gas mixture is passed through a catalyst from active carbon, where sulfur dioxide interacts with chlorine to form sulfuryl chloride. The resulting sulphuryl chloride is hydrolyzed with 88% sulfuric acid to give 54560 nm / h of hydrogen chloride and 25420 kg / h of sulfuric acid in terms of monohydrate. The water vapor content in the purified hydrogen chloride does not exceed 0.10% by volume. The composition of gas mixtures. Source hydrogen chloride: HCl 99.0 vol.%, Organochlorine impurities 1.0 vol.%.

Purified hydrogen chloride, vol.%: HC1 98.2; COj 1.5; 0 0.13; HjO 0.10. No organic impurities

 Clj and SO - traces.,

PRI mme R 2. 43200 nm / h of hydrogen chloride containing 2.0% by volume of monochloroacetic acid are mixed with 6600 oxygen and 7600 kg / h of sulfur are burned in this mixture at 1200 ° С. After burning sulfur, burning gas containing sulfur dioxide 5200; oxygen 104; hydrogen chloride 43200; carbon dioxide gae 1728; steam 864, cooled to 20-50 ° C, 5200 chlorine is added and the gas mixture is passed through the catalyst, where. sulfur dioxide interacts with chlorine to form sulfuryl chloride. The resulting sulfuryl chloride is hydrolyzed with sulfuric acid to give 53600 hydrogen chloride and 23275 kg / h of sulfuric acid in terms of 14-hydrate. The content of water vapor in the charged hydrogen chloride does not exceed 0.10% by volume;

The composition of gas mixtures. Source hydrogen chloride:

HC1 98.0 vol.%; organochlorine impurities 2.0 vol.%.

Purified hydrogen chloride, vol.%; HC1 96.6; CO2 3.11; 0 0.18; H, 00.10. Organic impurities are absent, Clg and SOj are traces.

Example 3. 43200 nm / h of hydrogen chloride containing 3.0 rpm of monochloroacetic acid 5 are mixed with 6750 oxygen and 6900 kg / h of sulfur are burned at this temperature at 1100 ° C. Sulfur dioxide containing sulfur burning 4720 contains , oxygen 86; chlorinated hydrogen 43200; carbon dioxide 2592; water vapor 1296, cooled to 20-50 ° C, 4720 nm / h of chlorine are added and the gas mixture is passed through the catalyst, where the interaction of sulfur dioxide with chlorine occurs with the formation of sulfuryl chloride. The resulting sulfuryl chloride is hydrolyzed with 93% sulfuric acid to give 52640 0 hydrogen chloride and 21130 kg / h of sulfuric acid in terms of monohydrate. The water vapor content in the purified hydrogen chloride does not exceed 0.10% by volume. 5 Composition of gas mixtures.

Source hydrogen chloride: HCl 97.0% by volume; organochlorine impurities 3.0% by volume.

Purified hydrogen chloride, about. %: 0 HC1 95.06; WITH 4.68; 0 0.15;

HjO 0.10. Organic impurities are absent, SOjClj, 01 and SO 2 - traces.

In the production of chlorosulfonic 5 acid, where the water vapor content in hydrogen chloride should not exceed 0.30, the resulting HC1 can be used

Example 4. 50 43200 nm / h of contaminated hydrogen chloride, which is 99.0 vol% HC1 and 1.0 vol% of organic impurities, are counted, calculated with 6400 oxygen, and burned in this mixture 55 8300 kg / h of sulfur when the gas mixture after burning sulfur, containing, nm / h: sulfur dioxide 5680; hydrogen chloride 42768; carbon dioxide 860; oxygen 75; 43C water vapor is cooled to 20-50 ° C, mixed with 5680 chlorine and passed through a layer of activated carbon catalyst for the formation of chloride sulfide from C and eO. The gas mixture obtained after the layer of activated carbon is irrigated with 88-93% sulfuric acid to hydrolyze the resulting sulfuryl chloride

to sulfuric acid and hydrogen chloride.

The composition of hydrogen chloride after hydrolysis of sulfuryl chloride and separation of liquid sulfuric acid, (vol.%): HC1 54128 (98.2); CO 860 (1.56); Oj 75 (O, 13); 55 (0.10). Organic impurities are absent, SOjClj, C1, n 50 - traces.

Claims (2)

1. METHOD FOR CLEANING GAS-HYDROGEN CHLORIDE HYDROGEN FROM ORGANIC IMPURITIES by burning in a mixture of a combustible reagent and oxygen, characterized in that, in order to reduce the humidity of hydrogen chloride and to ensure process safety, sulfur is used as a combustible reagent, the resulting gas mixture is cooled to 20 - 50 C, add chlorine, pass through a layer of activated carbon, and then treated with sulfuric acid with a concentration of not less than 88 wt.%. 2. The method of pop. 1, characterized in that the concentration of sulfuric acid is used equal to not more than 93 wt.%