Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-11-26
1992-06-30
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 62, 55 68, 55 71, 55 73, 55 74, 55 75, B01D 5304
Patent
active
051259354
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for efficiently obtaining an adsorbable gas from a gas containing a low concentration of the adsorbable gas.
BACKGROUND ART
The known method for obtaining a gas containing a high concentration of an adsorbable gas by subjecting a gas (hereinafter referred to as an original gas) containing a low concentration of the adsorbable gas to adsorption using an adsorbent and then desorbing the adsorbable gas adsorbed by the adsorbent by heating consists of having the adsorbable gas adsorbed by the adsorbent by passing the original gas from one side of a bed packed with the adsorbent to the other side of the bed and then indirectly heating the adsorbent from outside the packed bed, followed by desorbing and recovering the adsorbable gas either by introducing a heated carrier gas in contact with the adsorbent or by introducing a carrier gas having a temperature higher than that of a usual heated carrier gas in contact with the adsorbent.
In the conventional method, the maximum concentration rate which can be achieved by one cycle of adsorption and desorption is only about 10-20 times for a usual temperature of heating. Moreover, since only a small amount of a carrier gas can be used during desorption in order to obtain a recovery gas of high concentration, the gas flow rate in the adsorbent bed becomes low thereby resulting in nonuniform flow and insufficient heating.
SUMMARY OF THE INVENTION
The present invention, which has been achieved in order to eliminate the above disadvantages, provides a method which not only enables a high adsorption efficiency of an adsorbable gas but also enables a recovery gas of high concentration to be obtained even from an original gas of very low concentration by the use of a small thermal energy.
This invention relates to a method for efficiently obtaining a condensed adsorbable gas from an original gas containing a low concentration of the adsorbable gas by subjecting the original gas to the process of adsorption and desorption using adsorption columns packed with an adsorbent and then condensing the exhausted desorbed gas containing a higher concentration of the adsorbable gas, in which the adsorption column after adsorption is subjected to desorption after a desorbed gas exhausted from the second adsorption column to be mentioned later is introduced into the adsorption column to make the adsorbable gas contained in the desorbed gas be adsorbed by the column; an exhaust gas exhausted during the condensation of a desorbed gas and containing the noncondensed adsorbable gas is introduced into the second adsorption column to make the adsorbable gas contained in the exhaust gas be adsorbed by the column; and a desorbed gas containing the adsorbable gas and exhausted during the desorption of the second column which is performed in the next operation of adsorption and desorption is introduced into the adsorption column after adsorption.
The present invention also relates to a method for efficiently obtaining a condensed adsorbable gas from an original gas containing a low concentration of the adsorbable gas by subjecting the original gas to the process of adsorption and desorption using adsorption columns packed with an adsorbent and then condensing the exhausted gas containing a higher concentration of the adsorbable gas, which comprises introducing a gas containing a low concentration of an adsorbable gas into the first and the second columns to make the adsorbable gas contained in the original gas be adsorbed by the columns, repeating the cycle of subjecting the first column to desorption, condensing the resulting desorbed gas according to necessity, making the exhaust gas containing the noncondensed adsorbable gas be adsorbed by the second column and then using the exhaust gas from the second column for the desorption of the above first column (first cycle) and then repeating the cycle of subjecting the second column to desorption, condensing the resulting desorbed gas according to necessity, making the exhaust gas conta
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Murata Masashi
Nakaya Keiichi
Shimizu Masaaki
Asahi Glass Company Ltd.
Spitzer Robert
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