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US 11,230,771 B2Granted
Hydrogen production in the process of electrochemical treatment of sulfur-containing acid gases (hydrogen sulfide or sulfur dioxide) supplied in solution with amine-based or other organic absorbents
AssigneeHys Energy Ltd
InventorGleb Nikolaevich Tarabukin
Life of this patent
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Abstract
A method and an electrochemical cell for hydrogen production by electrochemical decomposition of a sulfur-containing acid gas such as H2S or SO2 are disclosed. The method comprises electrolysis of the acid gas in solution in the presence of an absorbent, which may be chemical, physical, or a mixture thereof. In typical embodiments, the absorbent is alkanolamine-based.
Claims20
A method for production of hydrogen gas in the presence of a sulfur-containing acid gas, said method comprising:
- providing at least one electrochemical cell, said electrochemical cell comprising:
- at least one positive electrode (anode) and one negative electrode (cathode);
- solution supply and withdrawal means for supplying and withdrawing a feed/electrolyte solution to and from said electrochemical cell;
- product withdrawal means for withdrawing from said electrochemical cell products of electrochemical reactions occurring within said electrochemical cell;
- and,
- electrical connecting means configured to provide external electrical connections to at least one of said positive electrode and said negative electrode;
- supplying to said electrochemical cell a feed/electrolyte solution comprising a sulfur-containing acid gas and at least one absorbent for said sulfur-containing acid gas;
- connecting said electrochemical cell to an external power supply so as to cause within said electrochemical cell an electrochemical reaction that produces hydrogen gas;
- and,
- removing said electrochemically produced hydrogen gas from said electrochemical cell;
- wherein:
- said feed/electrolyte solution is selected from the group consisting of:
- feed/electrolyte solutions comprising hydrogen sulfide and a hydrogen sulfide absorbent comprising an alkanolamine;
- feed/electrolyte solutions comprising hydrogen sulfide and a physical hydrogen sulfide absorbent selected from the group consisting of N-methylpyrrolidone, dimethyl ether of polyethylene glycol, tributyl phosphate, and methanol;
- and,
- feed/electrolyte solutions comprising sulfur dioxide, water, and a sulfur dioxide absorbent selected from the group consisting of primary amines, secondary amines, tertiary amines, triamines, and tetraamines.
13 more elements
An electrochemical cell (electrolyzer) for production of hydrogen in the presence of a sulfur-containing acid gas, comprising:
- at least one positive electrode (anode) and one negative electrode (cathode);
- a feed/electrolyte solution comprising said sulfur-containing acid gas;
- solution supply and withdrawal means for supplying and withdrawing said feed/electrolyte solution to and from said electrochemical cell;
- optionally, circulating means configured to circulate feed/electrolyte solution through said electrochemical cell;
- product withdrawal means for withdrawing from said electrochemical cell products of electrochemical reactions occurring within said electrochemical cell;
- and,
- electrical connecting means configured to provide external electrical connections to at least one of said positive electrode and said negative electrode;
- wherein:
- said feed/electrolyte solution is selected from the group consisting of:
- feed/electrolyte solutions comprising hydrogen sulfide and an absorbent comprising an alkanolamine;
- feed/electrolyte solutions comprising hydrogen sulfide and a physical hydrogen sulfide absorbent selected from the group consisting of N-methylpyrrolidone, dimethyl ether of polyethylene glycol, tributyl phosphate, and methanol;
- and,
- feed/electrolyte solutions comprising sulfur dioxide, water, and a sulfur dioxide absorbent selected from the group consisting of primary amines, secondary amines, tertiary amines, triamines, and tetraamines.
10 more elements
Dependencies are inferred from the claim text.