SU1248637A1 - Method of selective adsorption of carbon oxide - Google Patents

Description

ten

15

This invention relates to methods for selectively adsorbing carbon monoxide and may find use in the creation of controlled nitrogen-containing gaseous media.

The purpose of the invention is to increase efficiency by increasing the amount of gas mixture to be purified and the selective absorption of carbon monoxide.

For example, nitrogen gas containing 0.01% carbon monoxide, at a pressure of Oj10 MPa and a temperature of 78 K, is fed to an adsorber and first passed through a layer of zeolite CaA. In the process of selective adsorption of CO, the temperature of nitrogen and zeolite increases to 196 K. The coefficient of selective absorption of CO varies from 500 to 29, and the specific amount of nitrogen to be purified from 790 to 61 mol / kg. Then the purified nitrogen is passed through a layer of zeolite NiY, the temperature of the gas and zeolite increases from 196 to 303 K. At the same time, the selectivity coefficient varies from 25.8 to 35, and the specific amount of nitrogen to be purified is 0 t 38 to 6.1 mol / kg.

When purifying nitrogen on a layer of zeolite CaA at a constant temperature of 303 K (), only 1.6% of carbon monoxide is thinned. In this case, the selectivity coefficient is 12.3, and the specific amount of nitrogen being purified is 7.0 mol / kg. . .35

PRI mme R 2. Air-containing 0.01% carbon monoxide, at a pressure of 0.10 MPa and a temperature of 78 K, is first served on a layer of CaX zeolite. In pro20

25

thirty

the process of selective adsorption of CO, the temperature characteristics of the zeolite of air and zeolite

com for various Table 1

temperatures

CO selective adsorption temperature

Amount of CO absorbed

 Specific amount of gas to be purified, mol / kg

ten

15

- 35

2486372

 em up to 230 K. The selective absorption coefficient of CO varies from 219 to 12.8, and the specific amount of purified air from 360 to 10.5 mol / kg. Then the purified air passes through the NiY zeolite layer, the temperature of the gas and the zeolite increases from 230 to 303 K. At that, the selectivity coefficient varies from 29 to 35, and the specific amount of purified air from 19.1 to 6.1 mol / kg.

When air is purified on a layer of zeolite CaH at a constant temperature of 303 K, only 1.7% of carbon monoxide is absorbed. The coefficient of selectivity in this case is 8.5, and the specific amount of purified air is 3.2 mol / kg.

Example 3 A nitric mixture containing 0.05% carbon monoxide at a pressure of 0.12 Sh and a temperature of 78 K is first served on a layer of zeolite CaA, where during the selective adsorption of CO, the temperature of the gas and zeolite increases to 200 K. CO absorption varies from 500 to 24.2, and the specific amount of the mixture being purified is from 790 to 59J5 mol / kg. Then the cleaned mixture passes through the NiY zeolite layer and the temperature of the gas and zeolite increases from 200 to 303 K. The selectivity coefficient varies from 26.2 to 35, and the specific amount of the mixture being cleaned from 37.1 to 6.1 mol / kg .

In tab. 1 shows the comparative characteristics of the proposed and known methods.

In tab. 2 shows the comparative.

20

25

thirty

performance characteristics tse

com for various Table 1

temperatures

303 K 1.6-1.7%

12.3-8.5 7.0-3.2

Selectivity

Specific amount of purified gas M, mol / kg

The specific amount of purified gas M,

 Editor I. Shulla

Compiled by G. Vinokurova

Tehred M. Khodanych Proofreader G, Reshetnik

Order 4158/6 Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, 4.

 table 2

85.0 29.0 24.2 18.1 13.6 12.3

00

50

17.3

15.4

9.8

8.5

119

43.5 25.8 26.2 29.0 32.5 35

140

Claims (1)

METHOD OF SELECTIVE ADSORPTION OF CARBON Oxide from a nitrogen-containing gas mixture on CaA or CaX type zeolites, characterized in that, in order to increase the efficiency by increasing the amount of the purified gas mixture and the coefficient of selective absorption of carbon monoxide, the process on these zeolites is carried out at a temperature of the mixture increasing from 78 to 196-230 K, then the gas mixture is passed through type е zeolite with increasing temperature of the mixture to ambient temperature.