Method of producing thiourea using acidic waste gas discharged from oil refinery

Method of producing thiourea using acidic waste gas discharged from oil refinery

CN
  • CN 1,442,406 A
  • Filed: 03/31/2003
  • Published: 09/17/2003
  • Est. Priority Date: 03/31/2003
  • Status: Active Application
First Claim
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1. A method for producing thiourea by using acid waste gas discharged from an oil refinery is characterized in that the acid waste gas discharged from the oil refinery and calcium cyanamide are directly used for producing thiourea;

  • wherein the content of the first and second substances,the composition of the acidic waste gas discharged from the oil refinery is as follows;

    60-80% of hydrogen sulfide, 10-20% of air, 3-10% of carbon dioxide, 2-8% of ethane, 0.2-0.5% of methane, 0.2-0.4% of propylene, 0.09-0.2% of propane, 0.05-0.2% of ethylene, 0.09-0.15% of carbon monoxide and the balance of trace butylene, n-butane and isobutane;

    the specification of calcium cyanamide is;

    the content of available nitrogen is more than or equal to 17-20%, the content of calcium carbide is less than or equal to 0.2-1.0%, the content of screen residues with the aperture of 850 mu m is less than or equal to 3%, and the appearance is black powder.

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