Gasification process with zinc condensation on the carbon source
AssigneePhillips Petroleum Company
InventorJohn E. Cottle
Life of this patent
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Abstract
In a process for gasifying solid carbon sources such as coal utilizing zinc oxide as the oxygen donor, the carbon source is first contacted in a preheat zone with product gas; any zinc in this product gas is condensed on the carbon source; the preheated carbon source and zinc are then exposed to steam whereby the zinc is oxidized to zinc oxide; the mixture of zinc oxide and carbon source finally is reacted at elevated temperature conditions to form a gas comprising carbon monoxide and zinc.
Claims11
In a process for gasifying a solid carbon source wherein said solid carbon source is contacted wit zinc oxide at a temperature of 900.degree. C to 1650.degree. C to form a carbon monoxide and zinc-comprising gas and wherein said zinc is separated from said gas, oxidized and recycled into contact with the carbon source and wherein a carbon monoxide-comprising gas is recovered as a product of the process,
- the improvement comprising
- a. passing said carbon source sequentially through a preheater zone, a zinc oxidizing zone and a gasification zone,
- b. contacting said solid carbon source in said preheating zone with at least a portion of the gas produced in the gasification zone and condensing zinc on said solid carbon source,
- c. introducing the preheated solid carbon source, and zinc and steam into said zinc oxidation zone such as to form a mixture comprising said carbon source, zinc and steam,
- d. reacting said mixture such as to form solids comprising said solid carbon source and zinc oxide, and hydrogen, and
- e. passing said solids into said gasification zone and reacting said solids to form said carbon monoxide and zinc-comprising gas.
Dependencies are inferred from the claim text.