SU1695969A1 - Method of cleaning gases from organic admixtures and carbon monoxide - Google Patents

Abstract

The invention relates to the technology of catalytic purification of gases from organic compounds and CO used in the chemical, petrochemical, electrical engineering industry and which allows to increase the service life of the catalyst. A gas containing oxygen, nitrogen and impurities of CO and organic substances, such as xylene, acetone, phenol, methanol, formaldehyde, is passed through a layer of copper oxide chromium catalyst at 250-800 ° C. Periodically, hydrocarbon fuel is supplied to the gases to be purified in the amount of 0.5–5.0 g per 1 m of gas for 1–5 hours with interruptions for 2–20 hours. 4-30 minutes, and in the breaks - every 20-150 minutes. The method provides a degree of purification of 99.2-100% with a catalyst service life of 18-24 months, which is 11-60% higher than the known method. 2 tab.

Description

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The invention relates to the catalytic purification of gases from organic compounds and carbon monoxide and can be applied in the chemical, petrochemical, electrical and mechanical engineering industries, j

The purpose of the invention is to increase the service life of the catalyst.

PRI me R 1. Neutralization is subjected to a gas containing, wDO / m3): oxygen 21; xylene 4.2- (0.2); acetone 3.9- (0.1); nitrogen else. The height of the layer of oxide copper-chromium catalyst is 1 m, the linear velocity of the gas is 1 m / s. The process is carried out with periodic changes in the direction of gas filtration in the reaction zone. The neutralization process is carried out at 320-650 ° C.

Initially, the catalyst bed is heated to a temperature of 450 ° C. The source gas mixed with natural gas is supplied for purification, the latter being supplied in the amount of 3 g / m3 (0.42% by volume). The filtration directions are changed every 60 minutes for 3 hours. At the same time, the maximum temperature in the catalyst bed rises to 650 ° C. At the outlet of the catalyst bed, the purified gas contains, vol.%: Oxygen 20.09; water vapor 0.877; carbon dioxide 0.482; nitrogen else. In the initial mixture of acetone, xylene and methane are absent. Degree of cleaning 100%. After 3 h, the methane supply to the eye is stopped;

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gassed gas After that, the filtration directions of the source gas to be purified are changed every 15 minutes. This lasts for 10 hours. At the same time, the gas to be purified at the outlet of the catalyst bed has a composition of about. %: oxygen 20.9; xylene 2.9 water vapor 3.25 -10, carbon dioxide 6.1 10-2; nitrogen else. Acetone at the exit is absent. The degree of purification from toxic impurities (acetone, xylene) is 99.3%. After 10 hours, the supply of the gas to be purified mixed with the drive gas again follows, and the entire sequence is repeated. The average degree of purification for two half-periods (3 and 10 hours) is 99.5%.

In this mode of carrying out the deactivation process, the catalyst operates at an average temperature of 400 ° C, which ensures its service life of 20 months.

PRI me R s 2-15, the composition of the gas for cleaning and the parameters of the catalyst bed saved in example 1.

The test results are given in table.1.

Example 16. The initial reaction mixture with a temperature of 20 ° С contains,% by volume: phenol 0.09-methanol 3-10; formaldehyde 2 air else. The process is carried out on a layer of granular, copper-chromic oxide catalyst. The height of the layer is 1.8 m, the linear velocity is 1.2 m / s. Additional fuel input 2.5 g / m of the mixture to be cleaned. The fuel delivery time to the gas to be purified is 3 hours. The gas delivery time to the cleaning without fuel input is 3 hours. The process temperature is 550-650 ° C. Change of filtration directions in 10-100 min. The service life of the catalyst 22 months. The degree of gas purification from toxic impurities is full.

PRI me R 17. Disposal is subjected to a gas containing, vol.%, (Oxygen 21; xylene (0.2) 4.2 acetone 3.9 (0.1); nitrogen the rest. The height of the oxide layer

copper-chromium catalyst 1 m, linear speed of 1 m / s. The process is conducted in accordance with the proposed method. Additional fuel input 2 g / m3. Fuel delivery time 5 hours. Gas supply time

cleaning without fuel input for 2 hours. The temperature of the process is 500-670 ° C. Change the direction of filtration of the mixture in 10-100 minutes. The service life of the catalyst 20 months. The degree of air purification from vapor

acetone and xylene is full.

Examples 18-27. Carried out analogously to example 1 according to the conditions given in table 2.

From the above examples it is clear that

The proposed method allows, in comparison with the known, to increase the service life of the catalyst by 11-60% while maintaining a high degree of purification.

Claims (1)

Invention Formula The method of purification of gases from impurities of organic substances and carbon monoxide by oxidation to carbon dioxide and water on a solid catalyst at elevated temperatures, - and periodic change the direction of gas movement through the catalyst to the opposite, including the supply of hydrocarbon fuel to the gas to be purified, characterized in that, in order to increase the service life of the catalyst, the fuel is periodically supplied in an amount of 0.5-5.0 g / m for 1-5 h intermittently for 2–20 hours, while during the supply of fuel, the direction of gas movement changes every 4–30 minutes, and after every 20–150 minutes. Table Table 2