Process for gasifying carbonaceous material from a recycled condensate slurry
Patent 4244706 Issued on January 13, 1981. Estimated Expiration Date: 
September 10, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 10, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2591595 2595234 3607157 Oxidation of coal-water slurry feed to hydrogasifier Process for gasifying solid carbonaceous fuel Method for gasifying coal Patent #: 4067700 InventorsAssigneeApplicationNo. 06/074352 filed on 09/10/1979US Classes:48/202, Coal and water201/4, Gas or vapor containing mixture252/373, Carbon-oxide and hydrogen containing48/206ContinuousExaminersPrimary: Kratz, PeterAttorney, Agent or FirmInternational ClassesC10J 3/54 (20060101)C10J 3/46 (20060101) AbstractCoal or other carbonaceous material is gasified by reaction with steam and oxygen in a manner to minimize the problems of effluent water stream disposal. The condensate water from the product gas is recycled to slurry the coal feed and the amount of additional water or steam added for cooling or heating is minimized and preferably kept to a level of about that required to react with the carbonaceous material in the gasification reaction. The gasification is performed in a pressurized fluidized bed with the coal fed in a water slurry and preheated or vaporized by indirect heat exchange contact with product gas and recycled steam. The carbonaceous material is conveyed in a gas-solid mixture from bottom to top of the pressurized fluidized bed gasifier with the solids removed from the product gas and recycled steam in a supported moving bed filter of the resulting carbonaceous char. Steam is condensed from the product gas and the condensate recycled to form a slurry with the feed coal carbonaceous particles.Other References
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