Process for producing purified synthesis gas

Patent metadata

Field	Value
Publication number	US-9291390-B2
Application number	US-201214116142-A
Country	US
Kind code	B2
Filing date	May 10, 2012
Priority date	May 11, 2011
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

Process for producing purified synthesis gas from soot-containing synthesis gas having a temperature of at least 5° C. above its dew point comprising the steps of (a) cooling the soot-containing synthesis gas to a temperature below its dew point by indirect heat exchange in a shell-tube heat exchanger without removing the condensate formed, thereby forming a synthesis gas/condensate mixture; and (b) contacting the synthesis gas/condensate mixture with a scrubbing liquid to remove the condensate resulting in a purified synthesis gas and used scrubbing liquid, wherein the soot-containing synthesis gas in step (a) is passed through the shell-tube heat exchanger at the tube side.

First claim

What is claimed is:

1. A process for producing purified synthesis gas from an initially cooled, soot-containing synthesis gas having a temperature of at least 5° C. above its dew point comprising the steps of (a) further cooling the soot-containing synthesis gas to a temperature below its dew point by indirect heat exchange in a shell-tube heat exchanger without removing condensate formed, thereby forming a synthesis gas/condensate mixture in which the condensate contains most of the soot and sour gas contaminates present in the synthesis gas; and (b) contacting the synthesis gas/condensate mixture with a scrubbing liquid to remove the condensate resulting in a purified synthesis gas and used scrubbing liquid, wherein the soot-containing synthesis gas in step (a) is passed through the shell-tube heat exchanger at the tube side.

2. A process according to claim 1 , wherein the soot-containing synthesis gas used as a feed to step (a) is prepared by gasification of a carbonaceous feedstock followed by an initial cooling of resulting hot soot-containing synthesis gas effluent to a temperature of at least 5° C. above its dew point.

3. A process according the claim 2 , wherein the initial cooling takes place by indirect heat exchange using water as a cooling medium to produce steam.

4. A process according to claim 1 , wherein in step (a) water is used as a cooling medium at the shell side of the shell-tube heat exchanger resulting in a heated water stream.

5. A process according to claim 4 , wherein the heated water stream is used as at least part of the water which is used as the cooling medium in the process.

6. A process-according to claim 1 , wherein in step (a) the soot-containing synthesis gas is cooled to a temperature which is in the range of from 5 to 25° C. below its dew point.

7. A process according to claim 1 , wherein the scrubbing liquid in step (b) is water.

Assignees

• Eilers Jacobus
• Jonckers Arjan Allert
• Zoetemeijer Leendert Johannes Arie
• Shell Oil Co

Inventors

• Eilers Jacobus
• Jonckers Arjan Allert
• Zoetemeijer Leendert Johannes Arie

Classifications

• C10J3/00 Primary

  Production of combustible gases containing carbon monoxide from solid carbonaceous fuels (destructive distillation processes C10B) · CPC title

• C10J2300/1884

  with one stream being synthesis gas · CPC title

• C10K1/101

  with water only · CPC title

• F25J3/08 Primary

  Separating gaseous impurities from gases or gaseous mixtures {or from liquefied gases or liquefied gaseous mixtures}(cold traps B01D8/00) · CPC title

• C10K1/003

  of acid contaminants, e.g. acid gas removal · CPC title