Method for syngas clean-up of semi-volatile organic compounds with metal removal
First Claim
1. A method for cleaning unconditioned syngas for introduction into a syngas processing technology application, the unconditioned syngas including semi-volatile organic compounds (SVOC), at least one or both of hydrogen chloride and hydrogen sulfide, and having a metal concentration greater than 0 ppm to less than or equal to 30 ppm;
- the method comprising;
(a) contacting the unconditioned syngas with water to reduce the temperature of the syngas to below the SVOC condensation temperature to thereby form an intermediate SVOC-depleted syngas containing steam, and a first mixture comprising SVOC, solids and water;
(b) removing steam from the intermediate SVOC-depleted syngas containing steam to form (i) a first depleted syngas stream which has a reduced amount of SVOC and solids relative to the unconditioned gas, and (ii) a second mixture comprising SVOC, solids and water;
(c) after step (b), removing hydrogen chloride and/or hydrogen sulfide from the first depleted syngas stream with a scrubber;
(d) after step (c), compressing the syngas to a pressure ranging from 100 PSIG to 2,000 PSIG;
(e) after step (d), removing at least one metal from the syngas, said metal being one or more from the group consisting of mercury, arsenic, lead, and cadmium;
(f) after step (e), removing at least one sulfur containing compound from the syngas; and
(g) after step (f), removing carbon dioxide from the syngas with one or more from the group consisting of a membrane, an adsorber and an absorber;
wherein;
(i) the metal concentration after step (e) is less than or equal to 10 ppb;
(ii) the hydrogen chloride concentration in unconditioned syngas ranges from greater than 0 ppm to less than or equal to 1000 ppm;
(iii) the hydrogen chloride capture efficiency of the scrubber is greater than 80%;
(iv) the hydrogen sulfide concentration ranges from greater than 0 ppm to less than or equal to 1000 ppm;
(v) the hydrogen sulfide capture efficiency of the scrubber is greater than 80%;
(vi) the carbon dioxide concentration to step (g) ranges from 10% by volume to 40% by volume; and
(vii) the carbon dioxide capture efficiency of step (g) is greater than 20%.
2 Assignments
0 Petitions
Accused Products
Abstract
A system and method for processing unconditioned syngas first removes solids and semi-volatile organic compounds (SVOC), then removes volatile organic compounds (VOC), and then removes at least one sulfur containing compound from the syngas. Additional processing may be performed depending on such factors as the source of syngas being processed, the products, byproducts and intermediate products desired to be formed, captured or recycled and environmental considerations.
-
Citations
75 Claims
-
1. A method for cleaning unconditioned syngas for introduction into a syngas processing technology application, the unconditioned syngas including semi-volatile organic compounds (SVOC), at least one or both of hydrogen chloride and hydrogen sulfide, and having a metal concentration greater than 0 ppm to less than or equal to 30 ppm;
- the method comprising;
(a) contacting the unconditioned syngas with water to reduce the temperature of the syngas to below the SVOC condensation temperature to thereby form an intermediate SVOC-depleted syngas containing steam, and a first mixture comprising SVOC, solids and water; (b) removing steam from the intermediate SVOC-depleted syngas containing steam to form (i) a first depleted syngas stream which has a reduced amount of SVOC and solids relative to the unconditioned gas, and (ii) a second mixture comprising SVOC, solids and water; (c) after step (b), removing hydrogen chloride and/or hydrogen sulfide from the first depleted syngas stream with a scrubber; (d) after step (c), compressing the syngas to a pressure ranging from 100 PSIG to 2,000 PSIG; (e) after step (d), removing at least one metal from the syngas, said metal being one or more from the group consisting of mercury, arsenic, lead, and cadmium; (f) after step (e), removing at least one sulfur containing compound from the syngas; and (g) after step (f), removing carbon dioxide from the syngas with one or more from the group consisting of a membrane, an adsorber and an absorber; wherein; (i) the metal concentration after step (e) is less than or equal to 10 ppb; (ii) the hydrogen chloride concentration in unconditioned syngas ranges from greater than 0 ppm to less than or equal to 1000 ppm; (iii) the hydrogen chloride capture efficiency of the scrubber is greater than 80%; (iv) the hydrogen sulfide concentration ranges from greater than 0 ppm to less than or equal to 1000 ppm; (v) the hydrogen sulfide capture efficiency of the scrubber is greater than 80%; (vi) the carbon dioxide concentration to step (g) ranges from 10% by volume to 40% by volume; and (vii) the carbon dioxide capture efficiency of step (g) is greater than 20%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75)
- the method comprising;
Specification