SU858894A1 - Adsorbent for cleaning gas from carbon dioxide - Google Patents

Description

(54) ABSORBENT FOR CLEANING GAS FROM CARBON DIOXIDE

The invention relates to the purification of gases and can be used in the chemical industry, in particular in the production of ammonia for the purification of converted gas from carbon dioxide.

A carbon dioxide absorbent is known for the purification of carbon dioxide gas, which is an aqueous solution of mono-ethanol, nolamine 1.

The disadvantages of this scavenger are the high cost of the cleaning process and the impossibility of cleaning the hot gases.

Absorbent t2) is also known to purify gas from carbon dioxide, containing monoethanolamine, potassium carbonate, and water in trace amounts, mol / L

Monoethanolamine 0.2-0.6 Potassium carbonate 1.6-3.8 Water Else

The disadvantage of this absorbent is that the degree of gas purification from carbon dioxide is not high enough. For example, when cleaning absorbentszh containing mol / l IEA 0.3 and. 2.24, residual content,. carbon dioxide in the gas being cleaned

with a pressure of absorption of 30 at and a degree of carbonization of 0.15.

mole (MSA-fK CO; is 900 ppm.

The purpose of the invention is to create an absorbent that provides an increase in the degree of gas purification from carbon dioxide.

To this end, the absorbent contains these components in the following amounts, mol / l;

Monoethanolamine 1.0-5.0

Potassium carbonate 0.1-1.5

Water Rest

The absorbent allows a residual content of 30 ppm to be achieved under the conditions indicated for the purity grade with a known absorbent. Such a sharp decrease in the residual content of carbon dioxide is explained by the presence of a pronounced minimum in the indicated concentration range of components on the curve. The dependence of the partial pressure of carbon dioxide on the composition of the solution.

It should also be noted that a decrease in the concentration of potassium carbonate allows the cleaning temperature range to be extended with an absorbent of up to 40-100 ° C

eo-yo c)

Example 1 “Converted gas containing 20% COO. At 30 atm and consumption of 200 HMV4 is fed to the lower zone of the absorbent. An aqueous solution containing, mol / lSM3A 1.8 and 0.7, with a degree of carbonization of 0.2 mol CO / mol (K2CO5 + + MEA) is fed to the upper zone for irrigation. A spent carbonation degree of 0.7 and 80 s is removed from the lower zone of the absorbent and fed to the regeneration.

Converted gas with a CO content of 30 ppm is removed from the upper zone of the absorber.

Example 2. Converted gas under the conditions of example 1 and served in the lower zone of the absorber, irrigated with an aqueous solution containing mol / l: MEA 1.0 and 1.5, and the degree of carbonization of a solution of 0.15 mol CO / mol ( ).

Exhaust absorbent is withdrawn from the lower zone of the absorber at a carbonization degree of 0.65 and sent for regeneration.

Purified gas containing 50 ppm of CO2 is removed from the upper zone.

Example 3. Converted gas under the conditions of Example 1 was fed to the lower absorber zone irrigated with an aqueous solution containing 5.0 mol / l MEA and 0.1 mol / n at a carbonization degree of 0.25. The spent absorbent material is removed from the lower zone at and degree of carbonization of 0.75. The purified gas contains 50 ppm of coa.

Claims (2)

Invention Formula Absorbent for cleaning gas from two carbon monoxide, containing conoethanolamine, potassium carbonate, and eodus, which is devoid of tem (which, in order to increase gas purification, it contains these components in the following amounts, mol / l Monoethanolamine 1.0-5.0 Potassium carbonate 0.1-1 , 5 WaterEverything. Sources of information taken into account in the examination 1, Cole A.P., Rizenfeld F.S. Gas purification, M., Nedra, 1968, p. 21-66. 2. US patent number 3144301, cl. 23-2, 1964 (prototype).