Gas Purification Method
First Claim
1. A gas purification method comprising:
- providing an adsorption tower filled with an adsorbent that adsorbs a miscellaneous gas other than methane from a source gas containing methane;
providing a source gas supply line for supplying the source gas to the adsorption tower;
providing a product gas recovery line for discharging methane that has not been adsorbed on the adsorbent as a product gas;
providing a miscellaneous gas discharge line for discharging desorbed miscellaneous gas that has been adsorbed on the adsorbent; and
alternately performing, with the adsorption tower, the source gas supply line, the product gas recovery line, and the miscellaneous gas discharge line,an adsorption step of receiving the source gas into the adsorption tower from the source gas supply line, adsorbing the miscellaneous gas onto the adsorbent, and recovering the product gas into the product gas recovery line, anda desorption step of depressurizing-desorbing the miscellaneous gas adsorbed on the adsorbent and discharging said miscellaneous gas from the miscellaneous gas discharge line in a state in which the source gas supply line and the product gas recovery line are closed,wherein a carbon molecular sieve havinga pore volume (V0.38), at a pore diameter of 0.38 nm or more, of not exceeding 0.05 cm3/g anda pore volume (V0.34), at a pore diameter of 0.34 nm, of 0.15 cm3/g or more, in a pore diameter distribution measured by the MP method is used as the adsorbent, and,in the adsorption step, the miscellaneous gas is adsorbed from the source gas by bringing the source gas into contact with the adsorbent for 10 seconds or more and 6000 seconds or less so as to obtain a concentrated methane.
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Accused Products
Abstract
The rate of recovery of a purification target gas from a gas purification apparatus that uses a PSA device is improved, and both a high purity and a high recovery rate are achieved with good power efficiency. The present invention is directed to a gas purification method using the PSA method, in which a carbon molecular sieve having a pore volume, at a pore diameter of 0.38 nm or more, of not exceeding 0.05 cm3/g and a pore volume, at a pore diameter of 0.34 nm, of 0.15 cm3/g or more, in a pore diameter distribution measured by the MP method is used as an adsorbent, and, in an adsorption step, a miscellaneous gas is adsorbed from a source gas by bringing the source gas into contact with the adsorbent for 10 seconds or more and 6000 seconds or less so as to obtain a concentrated methane.
4 Citations
4 Claims
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1. A gas purification method comprising:
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providing an adsorption tower filled with an adsorbent that adsorbs a miscellaneous gas other than methane from a source gas containing methane; providing a source gas supply line for supplying the source gas to the adsorption tower; providing a product gas recovery line for discharging methane that has not been adsorbed on the adsorbent as a product gas; providing a miscellaneous gas discharge line for discharging desorbed miscellaneous gas that has been adsorbed on the adsorbent; and alternately performing, with the adsorption tower, the source gas supply line, the product gas recovery line, and the miscellaneous gas discharge line, an adsorption step of receiving the source gas into the adsorption tower from the source gas supply line, adsorbing the miscellaneous gas onto the adsorbent, and recovering the product gas into the product gas recovery line, and a desorption step of depressurizing-desorbing the miscellaneous gas adsorbed on the adsorbent and discharging said miscellaneous gas from the miscellaneous gas discharge line in a state in which the source gas supply line and the product gas recovery line are closed, wherein a carbon molecular sieve having a pore volume (V0.38), at a pore diameter of 0.38 nm or more, of not exceeding 0.05 cm3/g and a pore volume (V0.34), at a pore diameter of 0.34 nm, of 0.15 cm3/g or more, in a pore diameter distribution measured by the MP method is used as the adsorbent, and, in the adsorption step, the miscellaneous gas is adsorbed from the source gas by bringing the source gas into contact with the adsorbent for 10 seconds or more and 6000 seconds or less so as to obtain a concentrated methane. - View Dependent Claims (2, 3, 4)
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Specification