Method for syngas clean-up of semi-volatile organic compounds with solids 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), and at least one or both of hydrogen chloride and hydrogen sulfide, 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 sulfur containing compound from the syngas;
(f) also after step (b), separating the water within the second mixture based upon immiscibility so that the SVOC and solids collect together to form a third mixture separate from the water; and
(g) after step (f) agglomerating the solids together to form an agglomerated cake having density greater than that of water;
wherein;
(i) the hydrogen chloride concentration in unconditioned syngas ranges from greater than 0 ppm to less than or equal to 1000 ppm;
(ii) the hydrogen chloride capture efficiency is greater than 80%;
(iii) the hydrogen sulfide concentration in unconditioned syngas ranges from greater than 0 ppm to less than or equal to 1000 ppm; and
(iv) the hydrogen sulfide capture efficiency is greater than 80%.
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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.
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Citations
75 Claims
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1. A method for cleaning unconditioned syngas for introduction into a syngas processing technology application, the unconditioned syngas including semi-volatile organic compounds (SVOC), and at least one or both of hydrogen chloride and hydrogen sulfide, the method comprising:
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(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 sulfur containing compound from the syngas; (f) also after step (b), separating the water within the second mixture based upon immiscibility so that the SVOC and solids collect together to form a third mixture separate from the water; and (g) after step (f) agglomerating the solids together to form an agglomerated cake having density greater than that of water; wherein; (i) the hydrogen chloride concentration in unconditioned syngas ranges from greater than 0 ppm to less than or equal to 1000 ppm; (ii) the hydrogen chloride capture efficiency is greater than 80%; (iii) the hydrogen sulfide concentration in unconditioned syngas ranges from greater than 0 ppm to less than or equal to 1000 ppm; and (iv) the hydrogen sulfide capture efficiency is greater than 80%. - 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)
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Specification