Method for Syngas Clean-Up of Semi-Volatile Organic Compounds
First Claim
1. A method for removing solids and semi-volatile organic compounds (SVOC) from unconditioned syngas having steam contained therein, the unconditioned syngas having a first temperature above a SVOC condensation temperature, the method comprising:
- (a) contacting the unconditioned syngas with a solvent and 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, solvent 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 relative to the unconditioned gas stream, and (ii) a second mixture comprising SVOC, solids, solvent and water;
(c) separating the water within the second mixture based upon immiscibility so that the SVOC, solids and solvent collect together to form a third mixture above the water;
(d) separating the solids from the SVOC and solvent in a vessel having at least one liquid phase candle filter such that the solids agglomerate on a surface of the candle filter and form a filter cake having density greater than that of water within the vessel;
(e) backflushing the candle filter to loosen the filter cake so that the filter cake sinks into the water within the vessel; and
(f) removing the filter cake from a bottom of the vessel.
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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.
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Citations
15 Claims
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1. A method for removing solids and semi-volatile organic compounds (SVOC) from unconditioned syngas having steam contained therein, the unconditioned syngas having a first temperature above a SVOC condensation temperature, the method comprising:
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(a) contacting the unconditioned syngas with a solvent and 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, solvent 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 relative to the unconditioned gas stream, and (ii) a second mixture comprising SVOC, solids, solvent and water;(c) separating the water within the second mixture based upon immiscibility so that the SVOC, solids and solvent collect together to form a third mixture above the water; (d) separating the solids from the SVOC and solvent in a vessel having at least one liquid phase candle filter such that the solids agglomerate on a surface of the candle filter and form a filter cake having density greater than that of water within the vessel; (e) backflushing the candle filter to loosen the filter cake so that the filter cake sinks into the water within the vessel; and (f) removing the filter cake from a bottom of the vessel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for removing solids and semi-volatile organic compounds (SVOC) from unconditioned syngas having steam contained therein, the unconditioned syngas having a first temperature above a SVOC condensation temperature, 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 stream, and (ii) a second mixture comprising SVOC, solids and water;(c) 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; (d) agglomerating the solids together to form a agglomerated cake having density greater than that of water; and (e) applying mechanical pressure to the agglomerated cake to remove residual liquid therefrom to form a liquid depleted solids. - View Dependent Claims (14, 15)
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Specification