SU679228A1 - Method of cleaning gas mixtures from carbon monoxide by adsorption - Google Patents

Description

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The invention relates to the field of purification of gas mixtures, in particular to the adsorption purification of nitric protective gas atmospheres, and can be used in the chemical and metallurgical industries.

A known method of producing pure hydrogen from a gas mixture containing hydrogen, nitrogen, as well as small amounts of ammonia and water, through which the gas mixture is passed through a synthetic zeolite of the type NaA at low temperatures and elevated pressure 11

The disadvantage of this method is the need to maintain low temperatures and elevated pressure, as well as the complexity and considerable cost of producing a synthetic adsorbent.

The closest to the invention in technical essence and the achieved result is the method of adsorbing gas purification from carbon monoxide by natural, artificial or synthetic copper-substituted forms of zeolites, which means that the gas mixture containing carbon monoxide passes through the columns filled with

zeolite. The regeneration is carried out at temperatures from room temperature to, at an optimal regeneration temperature of 250 ° C.

The disadvantage of this method is the low degree of purification from carbon monoxide with repeated use of zeolite, the complexity and complexity of its production.

The aim of the invention is to increase the degree of purification, reduce the cost and simplify the cleaning process.

This goal is achieved by the described adsorption method of gas purification of mixtures from carbon monoxide using copper-mixed forms of zeolites, which take the copper-substituted form of natural clinoschtolite.

A distinctive feature of the method is the use of the copper-substituted form of natural clinoptilolite.

Co the proposed method, as an adsorbent, uses a copper-mixed (C-form) form of clinoptilolite, which is obtained as a result of five-fold treatment of natural clinoptilolite 0.5. chlorine copper solution. In this case, a 35% -i oro replacement of the exchange capacity of the outgoing zeolite for copper is achieved. In order to carry out the process, the gas mixture is passed through a gpm absorbing column until the carbon monoxide molecules break through at the outlet of the column. The content of oxide / alcohol in the working gas mixture varies from 2.7-10%. Teyperatu | for cleaning process 20 ° C. The regeneration of the adsorbent is carried out at 100-ISO C with nitrogen or other neutral gas, the regeneration time is 30 min. Min. Adsorption gas purification from carbon monoxide under dynamic conditions using med-substituted and metallized forms of a clinoptiolite ensures the continuity of the process for 60-90 minutes. The absorption rate of the adsorbent, oo-6 under the above conditions, is 0.7%. Example 1. In semi-polar conditions, protected gases containing 2.7% of carbon monoxide are passed sequentially, first through the column (volume 21.3), filled with g.um kageleleg / grade KOM, where the gas is drained, then through the column (5.5 l volume), filling with natural glutentilolite (12000 g shss, fraction 3-4 mm), where the gas is deeply deep and its carbon dioxide is cleaned, and finally through the column (1.3 l volume, height 500 mm, diameter 60 mm, weight 2500 g, fraction 2-3 mm), filled with a copper-substituted form of clinoptilolite, where deep Pts occurs stka from carbon monoxide. Temlerat phase cleaning process 20 ° C. The presence of carbon monoxide at the outlet of the column with the C-form of clinoptilolite was recorded by an optical-acoustic gas analyzer of mark OA-2109 with an automatic self-recording bridge of mark MSR1-03. The dynamic activity of a clinoptilmed copper-shaped form - the protective time is 60 minutes, which is acceptable for industrial conditions. Passing gas through the columns to remove water, carbon dioxide and carbon monoxide lead to carbon monoxide molecules, after which desorption and regeneration are carried out, while the adsorbent's adsorbent capacity for carbon monoxide does not decrease. Each process is repeated times. The results of the purification are reproduced. The table presents the data on the degree of purification of the gas mixtures. 2X5 containing 2.7-10% CO and the time of application using the proposed adsorbent.

Note. In experiments 1-2, the mass of the adsorbent is 2.5 kg.

The use of the proposed method of purifying gases from carbon monoxide provides the following advantages in comparison with existing methods; the possibility of continuous purification of the gas stream from carbon monoxide under dynamic conditions, with this, 100% cleaning of the protective action was achieved; reliable reproducibility of the cleaning result, regardless of the number of cycles, i.e. ensuring multi-cycle operation of protective gases without emissions into the atmosphere and reducing the degree of its pollution; the creation and use of installations for the purification of waste protective gases for the purpose of their repeated use; annual economic effect when using installations

cleaning of carbon monoxide only at two metallurgical plants of Lipetsk and Verkhisetsky (Sverdlovsk) will be 3,024,000 rubles / year.

The use of a copper-substituted form of clinoptylolite allows cleaning protective atmospheres from carbon monoxide at a lower cost, since clinoptilolite is 100 times smaller than synthetic zeolites. Repeated use of protective shielding gases, for example, in metallurgy will significantly reduce the pollution of the environment.

Claims (1)

Invention Formula The method of adsorption cleaning of gas mixtures from carbon monoxide using copper56792286 of substituted forms of zeolites, I distinguish — Sources of information taken in attention and in order to improve the degree of purification, reduction and simplification 1. The Federal Republic of Germany patent N 1249837, cl. 12 i 1/32, 1967. process, use the copper form 2. Patent of France No. 2094476, cl. From 01 to 1/00, natural clinoptkolit.5 1972 (prototype).