US 4,539,020 AGranted

Methods for obtaining high-purity carbon monoxide

AssigneesKawasaki Steel Corporation, Osaka Sanso Kogyo Ltd.

InventorsToshikazu Sakuraya, Tetsuya Fujii, Shigeo Matsui, Shigeki Hayashi

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Abstract

A process for separating carbon monoxide from a feed gas comprising CO.sub.2, CO and less adsorbable component than CO through PSA by using at least two adsorption columns in two stage adsorption operation which comprises a first adsorption stage for removing CO.sub.2 from said feed gas and a second adsorption stage for separating CO from gaseous mixture withdrawn from the first adsorption stage: (1) the first adsorption stage comprising a pressure swing adsorption repeating adsorption and desorption, and (2) the second adsorption stage comprising: (i) pressurization by the first stage product gas, (ii) adsorption, (iii) depressurization, (iv) purge by product gas, (v) evacuation for recovering product gas, and (vi) pressurization by gas withdrawn in other column, periodically switching the flow between or among said columns so as to repeat the above steps in the columns, and a process for separating carbon monoxide from a feed gas comprising carbon monoxide and less adsorbable component than CO through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide which comprises: (i) pressurization by feed gas, (ii) adsorption, (iii) depressurization, (iv) purge by product gas, (v) evacuation for recovering product gas, and (vi) pressurization by gas withdrawn in other column, periodically switching the flow between or among said columns so as to repeat the above steps in the columns are disclosed.

Claims17

Dependent claims

A process for separating carbon monoxide from a feed gas comprising C0.sub.2, CO and a less adsorbable component than CO through PSA by using at least two adsorption columns in a two stage adsorption operation which comprises a first adsorption stage for removing C0.sub.2 from said feed gas and a second adsorption stage for separating CO from gaseous mixture withdrawn from the first adsorption stage:

(1) the first adsorption stage comprising a pressure swing adsorption, repeating adsorption and desorption by using at least two first stage columns containing an adsorbent exhibiting a selective adsorption property to carbon dioxide to remove carbon dioxide from said feed gas, and
(2) the second adsorption stage comprising a process for separating carbon monoxide from the gaseous mixture, which has been withdrawn for the first adsorption stage, through PSA by using at least two second stage adsorption columns containing an adsorbent exhibiting a selective adsorption property to carbon monoxide which comprises:
(i) pressurizing a second stage adsorption column by a first stage product gas which has been withdrawn from the first adsorption stage, in which the step (vi) was previously completed;
(ii) introducing the first stage product gas into the second stage adsorption column, in which step (i) was previously completed, so as to effect adsorption of carbon monoxide;
(iii) connecting the second stage adsorption column in which step (ii) was previously completed, to the other second stage absorption column in which step (v) was previously completed, to reduce the pressure in the former adsorption column, and increase pressure in the latter adsorption column;
(iv) purging a less adsorbable component than CO by passing product gas through the second stage adsorption column, in which step (iii) was previously completed;
(v) evacuating the second stage adsorption column, in which step (iv) was previously completed, to recover carbon monoxide adsorbed by the adsorbent of the adsorption column;
and
(vi) connecting the second stage adsorption column, in which step (v) was previously completed, to the other adsorption column, in which step (ii) was previously completed to increase pressure in the former column,
periodically switching to the flow among said adsorption columns so as to repeat the above steps in the columns.

7 more elements

A process for separating carbon monoxide from a feed gas comprising carbon monoxide and less adsorbable component than CO through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting a selective adsorbtion property to carbon monoxide which comprises:

(i) pressurizing an adsorption column by the feed gas, in which the step (vi) was previously completed;
(ii) introducing the feed gas into the adsorption column, in which step (i) was previously completed, so as to adsorb carbon monoxide,
(iii) connecting the adsorption column, in which step (ii) was previously completed, to the other adsorption column in which step (v) was previously completed, to reduce the pressure in the former adsorption column, and to increase pressure in the latter adsorption column;
(iv) purging less adsorbable component than CO by passing product gas through the adsorption column, in which step (iii) was previously completed;
(v) evacuating the adsorption column, in which step (iv) was previously completed, to recover carbon monoxide adsorbed within the adsorption column;
(vi) a connecting the adsorption column, in which step (v) was previously completed, to the other adsorption column in which step (ii) was previously completed to increase pressure in the former column, and
(vii) introducing into the adsorption column in which step (vi) was previously completed the gas withdrawn in step (iv) of the other column,
periodically switching the flow among said adsorption columns so as to repeat the above steps in the columns.

5 more elements

Dependencies are inferred from the claim text.