Patents by Inventor Leon S. Scott

Leon S. Scott 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).

  • Recovery of hexamethylenediamine (HMD) with low polarographically reducible impurities (PRI) from mixtures of HMD, aminocapronitirle and PRI
    Patent number: 6248926
    Abstract: A method for separating a mixture of hexamethylenediamine, aminocapronitile and polarographically reducible impurities using fractional distillation in which the temperature in the rectifying zone of a distillation column varies sigmoidally along its length to force a major portion of the PRI to co-distill with the aminocapronitrile.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: June 19, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John J. Ostermaier, Leon S. Scott
  • Method for controlling color formation during polytetramethylene ether glycol production
    Patent number: 5596074
    Abstract: A process for removing precursors, such as low boiling alkyl glycols (e.g., ethylene glycol and/or 1,2-propylene glycol), to undersirable color forming acetal impurities (e.g., 1,3 -dioxolane and 4-methyl-1,3-dioxolane) from technical grade 1,4-butanediol/2-methyl-1,4-butanediol mixtures and the like by distillative topping of the diol mixture prior to ring closing cyclization to corresponding tetrahydrofuran/3-methyl tetrahydrofuran mixture and subsequent polymerization to polytetramethylene glycol ether polymers. Such a process is useful to produce THF and PTMEG having a APHA color index of nearly zero.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: January 21, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Peter A. Bloxham, Anne I. Breikss, Richard E. Ernst, Leon S. Scott, John D. Super, James D. Verbsky
  • Preparation of 3-pentenoic acid and a catalyst therefore
    Patent number: 5288903
    Abstract: Preparation of 3-pentenoic acid by the reaction of 3-pentenoylchloride, water and butadiene. 3-chloro-1-butene and 1-chloro-2-butene are also formed. Preferably the 3-pentenoylchloride is formed by the reaction of chlorobutene with carbon monoxide using a palladium catalyst.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: February 22, 1994
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Emilio E. Bunel, Chen-Chou Chiang, Michael B. D'Amore, Erik J. Schaumann, Leon S. Scott
  • Enhanced extraction of valeric acid or caproic acid from aqueous mixtures
    Patent number: 5254255
    Abstract: Extraction of valeric and/or caproic acid from an aqueous solution containing adipic acid and/or methyl glutaric acid using an organic solvent is enhanced by carrying out the process using an extraction-enhancing acid, such as acetic or isobutyric acid, which is soluble in the organic solvent.
    Type: Grant
    Filed: October 15, 1992
    Date of Patent: October 19, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William S. Kalema, Leon S. Scott
  • Process for the production of fiber-grade terephthalic acid
    Patent number: 4158738
    Abstract: Process for the preparation of fiber-grade terephthalic acid by continuously oxidizing paraxylene while vaporizing a portion of the contents of the reactor. Fiber-grade terephthalic acid is produced by maintaining (1) a temperature of at least 210.degree. C., (2) a molecular oxygen content of the noncondensables in the vapor withdrawn from the reactor in the range 3.0-6.0%, (3) a water level of the contents of the oxidizer in the range 5.0-17.0%, (4) a mole ratio of sodium to cobalt plus manganese in the range 0.06-2.0 in the reactor, (5) a mole ratio of cobalt to manganese in the range 0.5-5.0 (6) an organic burn in the range 8.0-15.0 burn units and (7) a productivity in the range 0.45-1.45 pounds of terephthalic acid per minute per 100 pounds of reactor contents.
    Type: Grant
    Filed: May 26, 1977
    Date of Patent: June 19, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Leon S. Scott, Roy W. Sommers