Continuous production of thiophene from butane
Patent 3939179 Issued on February 17, 1976. Estimated Expiration Date: 
February 17, 1993. 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.
February 17, 1993. 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 2562238 2694074 2694075 InventorsAssigneeApplicationNo. 392594 filed on 08/29/1973US Classes:549/85Metal containing catalyst utilizedExaminersPrimary: Trousof, NatalieAttorney, Agent or FirmAbstractThiophene is continuously produced by reacting normal butane or a normal butene and hydrogen sulfide at elevated temperatures over a dehydrogenation catalyst, said reaction being conducted in the presence of sulfur vapor introduced in an amount to maintain the elevated reaction temperature and to overcome the heat loss caused by the endothermic reaction between the C4 hydrocarbon and hydrogen sulfide.The mole ratio of hydrogen sulfide to C4 hydrocarbon must be maintained within the range of 15 to 20 moles of hydrogen sulfide per mole of n-butane or n-butene. Conversions may vary from 60 to 20% per pass depending on catalyst activity. This requires that unreacted C4 hydrocarbon and hydrogen sulfide be recirculated. Carbon disulfide is a by-product of the reaction along with nominal amounts of other materials. |
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