Production of purified synthesis gas H2-rich gas, and by-product CO2-rich gas
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/04
B01D-053/14
출원번호
US-0617630
(1975-09-29)
발명자
/ 주소
Child Edward T. (Tarrytown NY) Schlinger Warren G. (Pasadena CA) Richter George N. (San Marino CA)
출원인 / 주소
Texaco Inc. (New York NY 02)
인용정보
피인용 횟수 :
71인용 특허 :
0
초록▼
A raw synthesis gas feed stream, e.g., gaseous mixtures comprising H2 and CO and containing gaseous impurities including CO2, H2S, COS, and mixtures thereof (acid gas) and CH4, optionally in admixture with a CO-rich gas stream produced subsequently in the process, is introduced into a water-gas shif
A raw synthesis gas feed stream, e.g., gaseous mixtures comprising H2 and CO and containing gaseous impurities including CO2, H2S, COS, and mixtures thereof (acid gas) and CH4, optionally in admixture with a CO-rich gas stream produced subsequently in the process, is introduced into a water-gas shift reactor to produce H2 and CO2. Acid gases are then removed to produce a stream of purified synthesis gas by contacting the process gas stream with a first liquid solvent absorbent such as methanol, N-methyl-pyrrolidone, or dimethyl ether of polyethylene glycol. An H2-rich gas stream may be obtained by removing CO from the purified synthesis gas stream. This may be done by physical absorption in a second liquid solvent absorbent comprising an aqueous solution of cuprous ammonium acetate. By regenerating the second liquid solvent, the aforesaid CO-rich stream may be produced. The first liquid solvent absorbent may be desorbed of said acid gas and regenerated for reuse by such techniques as flashing plus reboiling or stripping. Advantageously, the gas used for stripping the first liquid solvent absorbent may be a portion of the synthesis gas feed either before or after removal of said acid-gas, or a portion of said H2-rich product gas. The CO2-rich gas optionally in admixture with stripping gas which is produced during the regeneration of said first liquid solvent absorbent may be injected into a subterranean oil reservoir to effect secondary or tertiary recovery of oil. Optionally, H2S may be in admixture with said CO2-rich gas mixture.
대표청구항▼
A process of purifying a raw synthesis gas stream comprising H2, CO, H2O, CO2, H2S, COS, particulate carbon, and optionally CH4, N2 and A and producing a by-product stream of CO2-rich gas for injection into an underground oil reservoir to effect secondary or tertiary recovery of oil comprising: 1. c
A process of purifying a raw synthesis gas stream comprising H2, CO, H2O, CO2, H2S, COS, particulate carbon, and optionally CH4, N2 and A and producing a by-product stream of CO2-rich gas for injection into an underground oil reservoir to effect secondary or tertiary recovery of oil comprising: 1. cooling said raw synthesis gas stream and removing said particulate carbon therefrom by contacting with water; 2. introducing the clean gas stream from (1) into a water-gas shift conversion zone in admixture with supplemental H2O and reacting together a portion of the CO and H2O in said shift conversion zone to produce additional H2 and CO2; 3. drying the process gas stream, cooling, and separating from said process gas stream about 0 to 70 volume % of the CO2, H2S, and COS; 4. contacting the process gas stream from (3) in an acid-gas absorption zone with a first liquid solvent absorbent to produce a rich first liquid solvent absorbent containing substantially all of the remaining CO2, H2S, and COS, and a product stream of purified synthesis gas comprising H2, CO, and optionally CH4, N2 and A; 5. regenerating said rich first liquid solvent absorbent in a first absorbent regeneration zone by removing a CO2-rich gas stream by the combination of stripping with a stripping gas selected from the group consisting of: (a) a portion of said raw synthesis gas, (b) a portion of the product stream of purified synthesis gas from (4), (c) a portion of a H2-rich gas stream, and (d) mixtures of (a), (b) and (c); and at least one of the following: flashing, heating; 6. introducing at least a portion of said CO2-rich gas stream in admixture with said stripping gas from (5) into a subterranean formation to effect secondary or tertiary recovery of oil. In a process for producing synthesis gas, hydrogen-rich gas, and by-product CO2-rich gas by reacting a hydrocarbonaceous feed by partial oxidation with a free-oxygen containing gas optionally in the presence of a temperature moderator in the reaction zone of a free-flow gas generator at a temperature in the range of about 1300°to 3500°F. and a pressure in the range of about 1 to 250 atmospheres to produce an effluent gas stream; cooling said effluent gas stream and removing particulate carbon therefrom thereby producing a clean process gas stream comprising H2, CO, CO2, H2O, H2S, COS and optionally CH4, N2, and A; introducing said clean, feed gas stream containing supplemental water into a water-gas shift reaction zone and reacting CO and H2O to produce H2 and CO2; and removing CO2, H2S and COS in an acid-gas absorption zone with a first liquid solvent absorbent, thereby producing a rich first liquid solvent absorbent and a dry product gas stream free from acid gas; the improvement comprising: 1. contacting at least a portion of said dry acid gas-free product gas in a CO-absorption zone with a second solvent absorbent which absorbs substantially all of the remaining CO in said process gas stream, and thereby producing said H2-rich product gas stream; 2. regenerating said second liquid solvent absorbent to produce a lean solution of said second liquid solvent absorbent and a by-product CO-rich gas stream; 3. recycling said CO-rich gas stream to said water-gaS shift conversion zone to produce additional hydrogen; 4. recycling at least a portion of said lean solution of second liquid solvent absorbent to the CO absorption zone in (1); 5. regenerating a portion of said first liquid solvent absorbent in a regeneration zone by flashing, boiling, and stripping with a stripping gas obtained from within the process and selected from the group consisting of a portion of said clean process gas stream, a portion of said dry product gas stream free from acid gas, and a portion of said H2-rich product gas stream, thereby producing a gaseous by-product stream comprising CO2-rich gas in admixture with said stripping gas, and a first liquid absorbent containing H2S and optionally COS; 6. boiling the first liquid solvent absorbent leaving (5) to produce an H2S-rich stream and a lean first liquid solvent absorbent stream; 7. recycling said lean first liquid solvent stream to said acid-gas absorption zone; and introducing said H2S-rich stream into a sulfur recovery zone; 8. introducing said gaseous by-product stream comprising CO2-rich gas in admixture with stripping gas from (5) into a subterranean formation to facilitate the recovery of oil; and 9. introducing a portion of said recovered oil into the reaction zone of said gas generator as at least a portion of said hydrocarbonaceous feed.
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