Method and system for reducing co2 emissions from industrial processes

Patent metadata

Field	Value
Publication number	US-2018326352-A1
Application number	US-201615776928-A
Country	US
Kind code	A1
Filing date	Nov 14, 2016
Priority date	Nov 17, 2015
Publication date	Nov 15, 2018
Grant date	—

Abstract

A method and an integrated system for reducing CO2 emissions in industrial processes. The method and integrated system (100) capture carbon dioxide (CO2) gas from a first gas stream (104) with a chemical absorbent to produce a second gas stream (106) having a higher concentration of carbon monoxide (CO) gas and a lower concentration of CO2 gas as compared to first gas stream. The CO gas in the second gas stream is used to produce C5 to C20 hydrocarbons in an exothermic reaction (108) with hydrogen (H2) gas (138). At least a portion of the heat generated in the exothermic reaction is used to regenerate the chemical absorbent with the liberation of the CO2 gas (128) captured from the first gas stream. Heat captured during the exothermic reaction can, optionally, first be used to generate electricity, wherein the heat remaining after generating electricity is used to thermally regenerate the chemical absorbent.

First claim

1 . A method, comprising:
capturing carbon dioxide (CO 2 ) gas from a first gas stream with a chemical absorbent, wherein the first gas stream includes carbon monoxide (CO) gas and CO 2 gas, to produce a second gas stream having a higher concentration of CO gas and a lower concentration of CO 2 gas as compared to first gas stream, wherein the first gas stream has a mole ratio of the CO gas to the CO2 gas (mole CO gas: mole CO2 gas) from 0.5:1 to 10:1; producing hydrocarbons with hydrogen (H 2 ) gas and the CO gas in the second gas stream from a Fischer-Tropsch reaction, wherein the Fischer-Tropsch reaction produces heat; and using at least a portion of the heat produced in the Fischer-Tropsch reaction to regenerate the chemical absorbent by liberation of the CO 2 gas captured from the first gas stream.

2 . The method of claim 1 , wherein the first gas stream has at least 20 volume percent (vol. %) of a combined amount of CO gas and CO 2 gas based on the total volume percent of the first gas stream.

3 . (canceled)

4 . The method of claim 1 , wherein the first gas stream has a mole ratio of the CO gas to the CO 2 gas (mole CO gas: mole CO 2 gas) of 0.5:1 to 2.5:1.

5 . The method of any one of the preceding claims, wherein capturing CO 2 gas from the first gas stream further includes capturing at least one additional substance in a gas phase, wherein the substance has a moiety selected from the group of an amine, a sulfur, a phosphate and a cyanide.

6 . The method of claim 1 , wherein producing hydrocarbons from the Fischer-Tropsch reaction includes producing C 5 to C 20 hydrocarbons.

7 . The method of claim 6 , wherein the H 2 gas and the CO gas in the second gas stream used to produce the C 5 to C 20 hydrocarbons from the Fischer-Tropsch reaction are reacted in a molar ratio of H 2 gas to CO gas (mole H 2 gas:mole CO gas) in the range of 1:1 to 3:1.

8 . The method of claim 7 , further including returning at least a part of the CO gas and H 2 gas remaining after the Fischer-Tropsch reaction to the second gas stream.

9 . (canceled)

10 . An integrated system, comprising:
a CO 2 absorption system having an inlet for a first gas stream having at least CO gas and CO 2 gas, wherein the CO 2 absorption system captures CO 2 gas from the first gas stream with a chemical absorbent to produce a second gas stream having higher concentration of CO gas and a lower concentration of CO 2 gas as compared to first gas stream; a Fischer-Tropsch reactor connected to a source of hydrogen (H 2 ) gas and to the CO 2 absorption system to receive the second gas stream, wherein the Fischer-Tropsch reactor operates to catalytically produce hydrocarbons from a Fischer-Tropsch reaction with the H 2 gas and the CO gas from the second gas stream, wherein the Fischer-Tropsch reaction produces heat; a heat exchanger connected to the Fischer-Tropsch reactor to capture heat produced during the Fischer-Tropsch reaction; and a CO 2 desorption system connected to both the CO 2 absorption system and the heat exchanger, wherein the heat captured by the heat exchanger of the Fischer-Tropsch reactor is first used in generating electricity, and wherein waste heat remaining after generating the electricity is used to thermally regenerate the chemical absorbent in the CO 2 desorption system to liberate the captured CO 2 gas.

11 . The integrated system of claim 10 , wherein the first gas stream has at least 20 volume percent (vol. %) of a combined amount of CO gas and CO 2 gas based on the total volume percent of the first gas stream.

12 . The integrated system of any one of claims 10 - 11 , wherein the first gas stream includes 5 to 60 volume percent (vol. %) nitrogen gas, 15 to 50 vol. % CO gas, 5 to 35 vol. % CO 2 gas and 1 to 35 vol. % hydrogen gas.

13 . The integrated system of claim 10 , wherein the first gas stream has a mole ratio of the CO gas to the CO 2 gas (mole CO gas:mole CO 2 gas) from 0.5:1 to 10:1.

14 . The integrated system of claim 10 , wherein the first gas stream has a mole ratio of the CO gas to the CO 2 gas (mole CO gas:mole CO 2 gas) of 0.5:1 to 2.5:1.

15 . The integrated system of claim 10 , wherein the H 2 gas and the CO gas in the second gas stream used to produce the hydrocarbons in the Fischer-Tropsch reaction are reacted in a molar ratio of H 2 gas to CO gas (mole H 2 gas:mole CO gas) in the range of 1:1 to 3:1.

16 . The integrated system of claim 10 , wherein the Fischer-Tropsch reactor operates with a cobalt-catalyst at a temperature in a range of 200° C. to 260° C. and a pressure in a range of 1000 kPa to 5000 kPa.

17 . The integrated system of claim 10 , wherein the Fischer-Tropsch reaction produces C 5 to C 20 hydrocarbons.

18 . The integrated system of claim 10 , wherein CO 2 gas from the Fischer-Tropsch reactor is supplied to the inlet of the CO 2 absorption system.

19 . The integrated system of claim 10 , wherein at least part of the CO gas and H 2 gas from the Fischer-Tropsch reactor is returned to the Fischer-Tropsch reactor.

20 . (canceled)

21 . The integrated system of claims 10 , wherein the first gas stream further comprises an effluent gas stream including a flue gas, an exhaust gas, a discharge gas, a process gas from an industrial process, or combinations thereof

22 . The integrated system of claims 10 , wherein the first gas stream further comprises an effluent gas stream from a steel making industrial process.

Assignees

• Dow Global Technologies Llc

Inventors

• Davidian Thomas
• Corthals Steven
• Biesheuvel Cornelis
• Ruitenbeek Matthijs
• Malek Andrzej
• Groenendijk Peter E
• Meima Garmt R

Classifications

• B01D53/8653

  characterised by a specific device · CPC title

• C01B2203/062

  Hydrocarbon production, e.g. Fischer-Tropsch process · CPC title

• B01D2259/65

  Employing advanced heat integration, e.g. Pinch technology · CPC title

• B01D2256/20

  Carbon monoxide · CPC title

• C01B2203/04

  containing a purification step for the hydrogen or the synthesis gas · CPC title