Patents by Inventor Than Nguyen Thanh

Than Nguyen Thanh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the separation of p-xylene in C.sub.8 aromatic hydrocarbons with a simulated moving bed adsorption and a crystallization
    Patent number: 5922924
    Abstract: To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25 to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which is then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: July 13, 1999
    Assignee: Institut Fran.cedilla.ais Du Petrole
    Inventors: Gerard Hotier, Claude Roux Guerraz, Than Nguyen Thanh
  • Process and apparatus for the separation of p-xylene in C.sub.8 aromatic hydrocarbons with a simulated moving bed adsorption and a crystallization
    Patent number: 5629467
    Abstract: To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography, with a ratio for the solvent to charge flow rates of 1.2 to 2.5; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25.degree. to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which is then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.
    Type: Grant
    Filed: March 27, 1995
    Date of Patent: May 13, 1997
    Assignee: Institut Francais du Petrole
    Inventors: Gerard Hotier, Claude Roux Guerraz, Than Nguyen Thanh
  • Apparatus for the separation of p-xylene in C.sub.8 aromatic hydrocarbons with a simulated moving bed adsorption and a crystallization
    Patent number: 5401476
    Abstract: To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography, with a ratio of the solvent to charge flow rates of 1.2 to 2.5; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25 to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which is then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: March 28, 1995
    Assignee: Institut Francais du Petrole
    Inventors: Gerard Hotier, Claude Roux Guerraz, Than Nguyen Thanh
  • Process and apparatus for the separation of p-xylene in C.sub.8 aromatic hydrocarbons with a simulated moving bed absorption and a crystallization
    Patent number: 5284992
    Abstract: To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography, with a ratio of the solvent to charge flow rates ob 1.2 to 2.5; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25.degree. to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which si then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.
    Type: Grant
    Filed: September 4, 1992
    Date of Patent: February 8, 1994
    Assignee: Institut Francais du Petrole
    Inventors: Gerard Hotier, Claude Roux Guerraz, Than Nguyen Thanh