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Process for production of synthesis gas

  • US 4,017,271 A
  • Filed: 06/19/1975
  • Issued: 04/12/1977
  • Est. Priority Date: 06/19/1975
  • Status: Expired due to Term
First Claim
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1. A process for producing a synthesis gas capable of being upgraded to a pipeline gas, which process comprises:

  • providing a reaction zone containing a molten salt consisting essentially of a major portion of sodium carbonate and a minor portion of at least 1 wt.% of sodium sulfide, said molten salt containing carbon in an amount of about 1 to 10% by weight of the molten salt and having a total solids concentration of less than about 25 wt.%,maintaining said molten salt at a temperature between about 1400° and

    2000°

    F,introducing a sulfur-containing carbonaceous material, substanially pure oxygen, and recycled carbon dioxide from the process into said molten salt reaction zone, said substantially pure oxygen and carbon dioxide being introduced in an amount sufficient to provide about 0.6 to about 1.2 mole of carbon dioxide per mole of oxygen,controlling the foregoing conditions without the introduction of steam to promote CO production and decompose said carbonaceous material, whereby the sulfur component of the carbonaceous material is retained in the molten salt, the reaction being carried out at a pressure between 1 and 100 atmospheres,obtaining from said reaction zone an initial gaseous effluent containing carbon monoxide, hydrogen, hydrocarbons and carbon dioxide, and being essentially free of sulfur-containing pollutants,subjecting said gaseous effluent to a water gas shift reaction,recovering a resultant gaseous mixture of carbon dioxide, carbon monoxide and hydrogen from said shift reaction,removing the carbon dioxide from said resultant gaseous mixture,recycling a portion of said carbon dioxide for introduction thereof into said molten salt reaction zone, andseparately recovering from the carbon dioxide removal process a substantially carbon-doxide-free synthesis gas capable of being upgraded to a pipeline gas.

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