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US Patent 6028228 - Production of formaldehyde from CH4 and H2 S

US Patent Issued on February 22, 2000
Estimated Patent Expiration Date: Icon_subject September 9, 2018Estimated 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.
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Abstract

A method wherein a sour natural gas stream can be treated to produce formaldehyde from methane and methyl mercaptans, (primarily methanethiol (CH3 SH) and a small amount of dimethyl sulfide (CH3 SCH3)) from hydrogen sulfide, and the methyl mercaptans preferably are passed in contact with a catalyst comprising a supported metal oxide or a bulk metal oxide in the presence of an oxidizing agent and for a time sufficient to convert at least a portion of the methyl mercaptan to formaldehyde (CH2 O), and sulfur dioxide (SO2).

Other References

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Inventor

Assignee

Application

No. 150097 filed on 09/09/1998

US Classes:

568/482, Methane reactant568/70Preparing by reacting hydrogen sulfide or a metal hydrosulfide

Field of Search

568/482, Methane reactant568/70Preparing by reacting hydrogen sulfide or a metal hydrosulfide

Examiners

Primary: Geist, Gary

Attorney, Agent or Firm

US Patent References

4544649, Catalysts comprising tantala supported on titania
Issued on: 10/01/1985
Inventor: Wachs ,   et al.
4570020, Production of methanethiol from H2 S and CO
Issued on: 02/11/1986
Inventor: Ratcliffe ,   et al.
4727198Process for the production of formaldehyde from methane
Issued on: 02/23/1988
Inventor: Spencer

Foreign Patent References

  • 0 267 711 EP. 05/09/1988
  • 0 640 559 EP. 03/09/1995
  • 24 04 738 A1 DE. 02/09/1974
  • 212993 RU. 02/09/2010
  • 8 002 177 SE. 09/09/1981
  • 589292 GB. 06/09/2010
  • 1263139 GB. 02/09/1972
  • 2238486 GB. 06/09/1991
  • WO 86 06063 WO. 10/09/1986
  • 98 17618 WO. 04/09/1998
  • 98 54118 WO. 12/09/1998

International Classes

C07C 045/00
C07C 319/00

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