Selective Removal and Recovery of Acid Gases from Gasification Products
First Claim
1. A process for removing hydrogen sulfide and carbon dioxide from a gas mixture, the process comprising the steps of:
- (A) providing a gas mixture comprising methane, carbon monoxide, hydrogen, hydrogen sulfide, and carbon dioxide;
(B) contacting the gas mixture with a first absorber under a first set of operating conditions to produce a hydrogen sulfide-depleted gas stream and a hydrogen sulfide-laden absorber stream, the hydrogen sulfide-depleted gas stream comprising about 5 ppm or less hydrogen sulfide;
(C) recovering the hydrogen sulfide-laden absorber stream;
(D) contacting the hydrogen sulfide-depleted gas stream with a second absorber under a second set of operating conditions to produce a carbon dioxide-depleted gas stream and a carbon dioxide-laden absorber stream, the carbon dioxide-depleted gas stream comprising about 50 ppm or less of carbon dioxide; and
(E) recovering the carbon dioxide-laden absorber stream;
wherein;
the first operating conditions comprise a first operating temperature and a first operating pressure,the second operating conditions comprise a second operating temperature and a second operating pressure,the first operating temperature is greater than the second operating temperature, andthe first and second absorbers substantially comprise methanol.
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Accused Products
Abstract
Processes and apparatuses are described for the selective removal and recovery of acid gases from a gas source comprising at least hydrogen sulfide and carbon dioxide. A step-wise approach is illustrated wherein hydrogen sulfide may be selectively removed from a gas source by treatment with methanol under conditions where substantially all the hydrogen sulfide may be removed. The partially purified gas source may then be provided with a second treatment with methanol under conditions which selectively remove carbon dioxide from the gas stream. Such methods are generally applicable to any gas source comprising at least hydrogen sulfide and carbon dioxide, for example, a gas source produced from the catalytic gasification of a carbonaceous material, the combustion of a carbonaceous material, or the oxy-blown gasification of a carbonaceous material.
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Citations
16 Claims
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1. A process for removing hydrogen sulfide and carbon dioxide from a gas mixture, the process comprising the steps of:
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(A) providing a gas mixture comprising methane, carbon monoxide, hydrogen, hydrogen sulfide, and carbon dioxide; (B) contacting the gas mixture with a first absorber under a first set of operating conditions to produce a hydrogen sulfide-depleted gas stream and a hydrogen sulfide-laden absorber stream, the hydrogen sulfide-depleted gas stream comprising about 5 ppm or less hydrogen sulfide; (C) recovering the hydrogen sulfide-laden absorber stream; (D) contacting the hydrogen sulfide-depleted gas stream with a second absorber under a second set of operating conditions to produce a carbon dioxide-depleted gas stream and a carbon dioxide-laden absorber stream, the carbon dioxide-depleted gas stream comprising about 50 ppm or less of carbon dioxide; and (E) recovering the carbon dioxide-laden absorber stream; wherein; the first operating conditions comprise a first operating temperature and a first operating pressure, the second operating conditions comprise a second operating temperature and a second operating pressure, the first operating temperature is greater than the second operating temperature, and the first and second absorbers substantially comprise methanol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for the purification of a gaseous mixture comprising:
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(a) a first unit comprising; (a1) a first unit top portion, (a2) a first unit bottom portion, (a3) a first gaseous mixture feed line, (a4) a first liquid feed line, (a5) a first condenser in fluid communication with the first unit top portion, the first condenser comprising a first condenser overhead portion, a first condenser bottom portion, and a first gaseous product line in fluid communication with the first condenser overhead portion, (a6) a first reboiler in fluid communication with the first unit bottom portion, and (a7) a first bottoms line in fluid communication with the first unit bottom portion; and (b) a second unit comprising; (b1) a second unit top portion, (b2) a second unit bottom portion, (b3) a second gaseous mixture feed line in fluid communication with the first gaseous product line, (b4) a second liquid feed line, (b5) a second condenser in fluid communication with the second unit top portion, the second condenser comprising a second condenser overhead portion, a second condenser bottom portion, and a second gaseous product line in fluid communication with the second condenser overhead portion, (b6) a second reboiler, having a second reboiler top portion and a second reboiler bottom portion, in fluid communication with the second unit bottom portion, and (b7) a second bottoms line in fluid communication with the second unit bottom portion or the second reboiler bottom portion. - View Dependent Claims (13, 14, 15, 16)
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Specification