PRESSURE SWING ADSORPTION PROCESS FOR SEPARATION AND RECOVERY OF CARBON MONOXIDE

摘要

The present invention is a mixed gas preparation step of preparing a mixed gas containing carbon monoxide; An adsorption step of supplying a mixed gas containing carbon monoxide to a first adsorption column, whereby carbon monoxide is adsorbed by an adsorbent and the remaining unadsorbed gas is released; A first cleaning step of supplying carbon monoxide-containing gas cleaned by supplying carbon monoxide to the first adsorption tower to a third adsorption tower; A second washing step of supplying carbon monoxide-containing gas washed to the fourth adsorption tower by supplying carbon monoxide to the first adsorption tower; A decompression equalization step of decompressing the first adsorption tower and supplying gases other than carbon monoxide to the third adsorption tower; A decompression equalization step of decompressing the first adsorption tower and supplying gases other than carbon monoxide to the fourth adsorption tower; An atmospheric pressure desorption step of recovering carbon monoxide from the first adsorption column under an atmospheric pressure atmosphere; A decompression and desorption step of recovering carbon monoxide by depressurizing the first adsorption tower; A pressure equalizing washing step of supplying carbon monoxide-containing gas to the first adsorption column by pressing and supplying carbon monoxide to the fourth adsorption tower; An equal pressure washing step of supplying carbon monoxide-containing gas to the first adsorption tower by pressing and supplying carbon monoxide to the fifth adsorption tower; A pressure equalizing step of supplying a gas containing carbon monoxide to the first adsorption tower by depressurizing the fourth adsorption tower; An equal pressure washing step of supplying carbon monoxide-containing gas to the first adsorption tower by pressing and supplying carbon monoxide to the fifth adsorption tower; And a pressure equalization step of supplying a gas containing carbon monoxide to the first adsorption column by depressurizing the fifth adsorption column. The present invention relates to a pressure fluctuation adsorption process for recovering carbon monoxide. According to the present invention, there is provided a pressure swing adsorption process capable of separating and recovering carbon monoxide contained in by-product gas with high purity using six or more adsorption towers.