Gas purification method
First Claim
1. A gas purification method for obtaining a purified gas by passing a feed gas containing water vapor and carbon dioxide as impurities through a plurality of adsorption columns which are packed with an adsorbent adsorbing the impurities and can be used switchably, and thus removing the impurities, the method comprising the steps of:
- (a) an adsorption step of adsorbing and removing the water vapor first and then the carbon dioxide by introducing compressed said feed gas into the adsorption columns, said feed gas in the adsorption step being introduce into the adsorption columns at a temperature within a range of 30°
C. through 45°
C.;
(b) a depressurization step of lowering internal pressure of the adsorption columns down to atmospheric pressure after the adsorption step;
(c) a heating step of heating and regenerating the adsorbent by introducing a purge gas not containing the impurities into the adsorption columns after the depressurization step, said purge gas supplying heat to the adsorption columns in the heating step of 0.5 or more relative to heat supplied to the adsorption columns by the feed gas in the adsorption step; and
(d) without cooling after the heating step, a repressurization step of elevating pressure by introducing a gas not containing the impurities into the adsorption column;
wherein the respective periods of time of the respective steps (a), (b+c) and (d) are each set to be within the range of 15 to 25 min.
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Accused Products
Abstract
The present invention relates to a gas purification method for adsorbing and removing impurities by PSA method combined with heating, capable of removing water vapor and carbon dioxide in an economical and effective way. The present invention includes an adsorption step of adsorbing and removing water vapor first and then carbon dioxide by introducing the compressed feed gas into the adsorption column; a depressurization step of lowering the internal pressure of the adsorption column down to atmospheric pressure after the adsorption step; a heating step of heating and regenerating an adsorbent by introducing a purge gas not containing the impurities into the adsorption column after the depressurization step; and a repressurization step of elevating pressure by introducing a gas not containing the impurities into the adsorption column after the heating step; wherein the period of time of the adsorption step, the depressurization step plus the heating step and the repressurization step are set to be within the range of 10 to 40 min respectively.
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Citations
10 Claims
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1. A gas purification method for obtaining a purified gas by passing a feed gas containing water vapor and carbon dioxide as impurities through a plurality of adsorption columns which are packed with an adsorbent adsorbing the impurities and can be used switchably, and thus removing the impurities, the method comprising the steps of:
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(a) an adsorption step of adsorbing and removing the water vapor first and then the carbon dioxide by introducing compressed said feed gas into the adsorption columns, said feed gas in the adsorption step being introduce into the adsorption columns at a temperature within a range of 30°
C. through 45°
C.;
(b) a depressurization step of lowering internal pressure of the adsorption columns down to atmospheric pressure after the adsorption step;
(c) a heating step of heating and regenerating the adsorbent by introducing a purge gas not containing the impurities into the adsorption columns after the depressurization step, said purge gas supplying heat to the adsorption columns in the heating step of 0.5 or more relative to heat supplied to the adsorption columns by the feed gas in the adsorption step; and
(d) without cooling after the heating step, a repressurization step of elevating pressure by introducing a gas not containing the impurities into the adsorption column;
wherein the respective periods of time of the respective steps (a), (b+c) and (d) are each set to be within the range of 15 to 25 min. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification