Utilizing Liquid Sorption Of Component From Gas Or Vapor Patents (Class 203/42)
  • Patent number: 3964980
    Abstract: The conventional process for the recovery of ethylene oxide produced by the silver catalyzed, vapor phase, partial oxidation of ethylene with molecular oxygen involves a sequence of steps including absorption in water of the ethylene oxide contained in the reaction effluent. The ethylene oxide-containing absorbate is then stripped and the vapor thus generated is subjected to reabsorption, also in water. This invention provides an improved stripper-reabsorption system and includes the steps of partial condensation of the stripper overhead and introduction of an additional absorbent stream into the readsorption step.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: June 22, 1976
    Assignee: Halcon International, Inc.
    Inventor: Brian I. Ozero
  • Patent number: 3962404
    Abstract: A process for regenerating absorbent solutions used for removing gaseous impurities such as CO.sub.2, H.sub.2 S,HCN, SO.sub.2 and other acidic gases from gaseous mixtures by stripping with steam, which comprisesA. dividing the solution to be regenerated into a principal and a secondary fraction (p and s) and regenerating these fractions separately from each other in a principal and a secondary regeneration column (P and S), the principal regeneration column being operated at a pressure of at least about 0.2 to 0.5 atm above the pressure of the secondary regeneration column,B. regenerating the principal fraction in the principal regeneration column by heat which is fed from outside into the lower part of the column,C. regenerating the secondary fraction in the secondary regeneration column by heat which has been removed from the regenerated solution leaving the principal regeneration column andD. passing the regenerated fractions to the absorber.
    Type: Grant
    Filed: February 19, 1974
    Date of Patent: June 8, 1976
    Inventors: Giuseppe Giammarco, Paolo Giammarco
  • Patent number: 3957880
    Abstract: Methacrolein is recovered from a crude gaseous mixture in a process comprising the steps of first absorbing the methacrolein from the mixture with a selective solvent to form a liquid mixture and thereafter subjecting the thus formed liquid mixture to an extractive distillation with water.
    Type: Grant
    Filed: January 3, 1974
    Date of Patent: May 18, 1976
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Ryozi Sato, Takanori Musha, Yoshio Ito
  • Patent number: 3948623
    Abstract: In a process for separating maleic anhydride or phthalic anhydride from a gaseous mixture by absorption into an organic absorbent flowing downwardly and countercurrently to the gaseous mixture in an absorption column having at least 4 stages, the improvement is made which comprises removing heat from a zone of the absorption column above the gaseous mixture feed point and below the top 2 stages of the column in a sufficient amount so that more than half of the temperature gradient for the absorbent liquid in the column is across at least 2 stages above the gaseous mixture feed point and below the top 2 stages of the column. Preferably said heat is removed from the absorber column by withdrawing a stream of absorbent from the lower part of the column, cooling the stream and then recycling the resulting cooled absorbent to the column.
    Type: Grant
    Filed: December 21, 1973
    Date of Patent: April 6, 1976
    Assignee: Chevron Research Company
    Inventors: Stephen G. Paradis, Wilton H. Lind
  • Patent number: 3949063
    Abstract: A process for regenerating working solutions used in cyclic processes for the manufacture of hydrogen peroxide using anthraquinones, the process consisting of a first distillation stage in which the solvent is separated under a pressure not greater than atmospheric pressure, and a second distillation stage in which the quinones and "light degraded products" are separated under a lower pressure. All the distillation products are used as a new working solution, the vapors of the second distillation stage being condensed on a liquid film of constantly renewed cold solvent originating from condensable vapors of the first distillation stage.
    Type: Grant
    Filed: November 6, 1974
    Date of Patent: April 6, 1976
    Assignee: Oxysynthese
    Inventors: Michel Coingt, Pierre Thirion
  • Patent number: 3936360
    Abstract: Substantial capital and operating cost savings and improved recovery of acrylonitrile and methacrylonitrile are realized by the recycle of the product column bottoms to the quench liquid of the reactor effluent quench system.
    Type: Grant
    Filed: February 9, 1973
    Date of Patent: February 3, 1976
    Assignee: The Standard Oil Company
    Inventor: Hsin Chih Wu