Preparing By Reacting Ether With Hydrogen Halide Patents (Class 570/259)
  • Process for the preparation of 1,3-dichloropropane
    Patent number: 6423189
    Abstract: A process for the preparation of 1,3-dichloropropane by reacting bis(3-hydroxypropyl)ether with hydrogen chloride, optionally in the presence of tertiary basic nitrogen compounds or other tertiary aliphatic bases as catalysts, distilling off the 1,3-dichloropropane and the water of reaction and working up the two phases.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: July 23, 2002
    Assignee: Degussa AG
    Inventor: Manfred Kaufhold
  • Method for preparing .alpha.,.omega.-bromochloroalkanes
    Patent number: 5994600
    Abstract: To prepare .alpha.,.omega.-bromochloroalkanes, a cyclic ether, to which water has optionally been added, is hydrochlorinated and then the resultant phase is reacted, without any prior purification or separation, with gaseous hydrobromic acid.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Gilles Drivon, Christophe Ruppin
  • Method for preparing .alpha., .omega.-bromochloroalkanes
    Patent number: 5981815
    Abstract: The invention relates to a process for the preparation of .alpha.,.omega.-bromochloroalkanes. A cyclic ether is hydrobrominated and then the phase obtained is reacted, without any prior purification or separation, with thionyl chloride.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: November 9, 1999
    Assignee: ELF Atochem, S.A.
    Inventors: Gilles Drivon, Christophe Ruppin
  • Process for the removal of dimethyl ether in methyl chloride
    Patent number: 4794204
    Abstract: A process is described for the removal of dimethyl ether in methyl chloride by catalytic cleavage by means of hydrogen chloride. Dimethyl ether is present as an impurity in crude methyl chloride produced by the catalytic esterification of methanol. The crude methyl chloride is cooled so that water and hydrogen chloride separate out. Gaseous hydrogen chloride is then added to the methyl chloride in an amount corresponding to at least twice the molar amount of dimethyl ether, and the gaseous mixture is passed over a methanol esterification contact catalyst at an elevated temperature.
    Type: Grant
    Filed: June 11, 1987
    Date of Patent: December 27, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hendrik W. Post, Helmold von Plessen, Wilhelm Lendle
  • Membrane solvent extraction process
    Patent number: 4532347
    Abstract: The instant invention relates to a membrane solvent extraction and reaction system. More particularly it pertains to an improvement in the membrane solvent extraction system wherein a solute is extracted through a polymeric membrane from one solvent liquid phase to an extracting solvent liquid without direct contact between the liquid phases which are separated by the membrane and in which the extracting solvent has no greater solubility and usually substantially less solubility for the solute than the feed solvent. The impovement comprises converting the solute permeating across the membrane to a different chemical compound, whereby a high concentration gradient for the solute across the membrane is maintained to improve the separation of the solute from the feed solvent liquid phase.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: July 30, 1985
    Assignee: Varen Technology
    Inventor: Ronald J. Vaughan