Patents by Inventor Lloyd Berg

Lloyd Berg 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).

  • Separation of isopropyl acetate from isopropanol by extractive distillation
    Patent number: 4693789
    Abstract: Isopropyl acetate cannot be completely removed from isopropyl acetate - isopropanol - water mixtures by distillation because of the presence of the minimum ternary azeotrope. Isopropyl acetate can be readily removed from mixtures containing it, isopropanol and water by using extractive distillation in which the extractive agent is a higher boiling oxygenated or nitrogenous organic compound or a mixture of these. Typical examples of effective agents are diethanolamine; ethanolamine and N-methyl pyrrolidone; triethanolamine and N-methyl pyrrolidone.
    Type: Grant
    Filed: March 5, 1986
    Date of Patent: September 15, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of t-Amyl alcohol from isobutanol by extractive distillation
    Patent number: 4693787
    Abstract: t-Amyl alcohol and isobutanol cannot be separated from each other by distillation because of the proximity of their boiling points. t-Amyl alcohol can be readily separated form isobutanol by using extractive distillation in which the extractive agent is a higher boiling organic compound or a mixture of two or more of these. Typical examples of effective agents are: dimethylsulfoxide; dimethylsulfoxide and N,N-dimethylacetamide; dimethylsulfoxide, dimethylformamide and phthalic anhydride.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: September 15, 1987
    Inventors: Lloyd Berg, Michael J. Shanahan
  • Separation of formic acid from acetic acid by extractive distillation
    Patent number: 4692219
    Abstract: Formic acid cannot be easily removed from acetic acid by distillation because of the closeness of their vapor pressures. Formic acid can be readily removed from acetic acid by extraction distillation. Typical extractive distillation agents are carboxylic acids in the range of hexamoic acid to neodecanoic acid with or without solvents such as methyl benzoate, acetophenone and nitrobenzene.
    Type: Grant
    Filed: December 3, 1986
    Date of Patent: September 8, 1987
    Assignee: Celanese Chemical Co.
    Inventor: Lloyd Berg
  • Separation of n-amyl acetate from n-amyl alcohol by extractive distillation
    Patent number: 4690734
    Abstract: n-Amyl acetate cannot be completely removed from n-amyl acetate - n-amyl alcohol - water mixtures by distillation because of the presence of the minimum ternary azeotrope. n-Amyl acetate can be readily removed from mixtures containing it, n-amyl alcohol and water by using extractive distillation in which the extractive distillation agent is a higher boiling organic compound or a mixture of these. Typical examples of effective agents are ethylene glycol; propylene glycol and dimethylsulfoxide; 1,3-butanediol, dimethylformamide and acetamide.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: September 1, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Conversion of molybdenite to molybdenum dioxide using petroleum or coal tar pitches
    Patent number: 4687647
    Abstract: Molybdenite, MoS.sub.2, is completely converted into molybdenum dioxide, MoO.sub.2, by mixing MoS.sub.2 with petroleum or coal tar pitches and heating in air at 400.degree.-600.degree. F.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: August 18, 1987
    Inventor: Lloyd Berg
  • Separation of m-xylene from o-xylene by extractive distillation
    Patent number: 4676875
    Abstract: m-Xylene is difficult to separate from o-xylene by conventional rectification or distillation because of the close proximity of their boiling points. m-Xylene can be readily separated from o-xylene by using extractive distillation in which the extractive agent is dimethylformamide; dimethylformamide and 1,4-butanediol; dimethylformamide, adiponitrile and dihexyl phthalate.
    Type: Grant
    Filed: January 6, 1986
    Date of Patent: June 30, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of m-xylene from o-xylene by extractive distillation with adiponitrile and mixtures thereof
    Patent number: 4676872
    Abstract: m-Xylene is difficult to separate from o-xylene by conventional distillation or rectification because of the close proximity of their boiling points. m-Xylene can be readily separated from o-xylene by using extractive distillation in which the extractive agent is adiponitrile or a mixture of it with certain high boiling organic compounds. Typical examples of effective agents are: adiponitrile; adiponitrile and 1,4-butanediol; adiponitrile, ethylene carbonate and benzyl alcohol.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: June 30, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of n-propyl acetate from n-propanol and water by extractive distillation
    Patent number: 4676874
    Abstract: n-Propyl acetate cannot be completely removed from n-propyl acetate - n-propanol - water mixtures by distillation because of the presence of the minimum ternary azeotrope. n-Propyl acetate can be readily removed from mixtures containing it, n-propanol and water by using extractive distillation in which the extractive distillation agent is a higher boiling oxygenated or nitrogenous organic compound or a mixture of these. Typical examples of effective agents are N-methylpyrrolidone; triethanolamine; N-methylpyrrolidone and ethylene glycol.
    Type: Grant
    Filed: November 7, 1985
    Date of Patent: June 30, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of isopropanol from isopropyl acetate by extractive distillation
    Patent number: 4675080
    Abstract: Isopropanol cannot be completely removed from isopropanol-isopropyl acetate-water mixtures by distillation because of the presence of the minimum ternary azeotrope. Isopropanol can be readily removed from mixtures containing it, isopropyl acetate and water by using extractive distillation in which the extractive agent is a higher boiling ester of phthalic acid. Typical examples of effective agents are diethyl phthalate, diisooctyl phthalate and methyl benzoate, dibutyl phthalate, methyl benzoate and nitromethane.
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: June 23, 1987
    Inventors: Lloyd Berg, Mark G. Vosburgh
  • Separation of n-hexyl alcohol from n-hexyl acetate by extractive distillation
    Patent number: 4673466
    Abstract: n-Hexyl alcohol cannot be completely removed from n-hexyl acetate- n-hexyl alcohol - water mixtures by distillation because of the presence of the minimum ternary azeotrope. n-Hexyl alcohol can be readily removed from mixtures containing it, n-hexyl acetate and water by using extractive distillation in which the extractive distillation agent is a benzoate or a mixture of benzoates with higher boiling organic compounds. Typical examples of effective agents are benzyl benzoate; methyl benzoate and adiponitrile; ethyl benzoate, benzyl benzoate and methyl salicylate.
    Type: Grant
    Filed: January 27, 1986
    Date of Patent: June 16, 1987
    Inventor: Lloyd Berg
  • Separation of m-xylene from o-xylene by extractive distillation with polychloro compounds
    Patent number: 4673465
    Abstract: m-Xylene is difficult to separate from o-xylene by conventional distillation or rectification because of the close proximity of their boiling points. m-Xylene can be readily separated from o-xylene by using extractive distillation in which the extractive agent is a mixture polychloro aromatic compounds. Typical examples of effective agents are 2,3,4,6-tetrachlorophenol and p-dichlorobenzene; dimethyltetrachloroterephthalate, 2,3,4,6-tetrachlorophenol and 1,2,4,5-tetrachlorobenzene; 2,4,5-trichlorophenol, benzene hexachloride, o-dichlorobenzene and dioctyl phthalate.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: June 16, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Dehydration of propanoic acid by extractive distillation
    Patent number: 4670105
    Abstract: Propanoic acid cannot be completely removed from propanoic-water mixtures by distillation because of the presence of the minimum azeotrope. Propanoic acid can be readily removed from mixtures containing it and water by using extractive distillation in which the extractive distillation agent is an acid amide. Typical examples of effective agents are acetamide; dimethylformamide and methyl glutaronitrile; formamide, adiponitrile and N,N-dimethylacetamide.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: June 2, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of n-amyl acetate and water from n-amyl alcohol by extractive distillation
    Patent number: 4670106
    Abstract: n-Amyl acetate cannot be completely removed from n-amyl acetate - n-amyl alcohol - water mixtures by distillation because of the presence of the minimum ternary azeotrope. n-Amyl acetate can be readily removed from mixtures containing it, n-amyl alcohol and water by using extractive distillation in which the extractive distillation agent is a higher boiling organic compound or a mixture of these. Typical examples of effective agents are dimethylsulfoxide; N,N-dimethylacetamide and dimethylsulfoxide; dimethylformamide, N,N-dimethylacetamide and acetamide.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: June 2, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of isopropyl ether from isopropanol and water by extractive distillation
    Patent number: 4666563
    Abstract: Isopropyl ether cannot be completely removed from isopropyl ether--isopropanol--water mixtures by distillation because of the presence of the minimum ternary azeotrope. Isopropyl ether can be readily removed from mixtures containing it, isopropanol and water by using extractive distillation in which the extractive distillation agent is a higher boiling glycol, glycol ether or a mixture of them. Typical examples of effective agents are ethylene glycol, propylene glycol, diethylene glycol diethyl ether plus propylene glycol ethyl ether.
    Type: Grant
    Filed: November 20, 1985
    Date of Patent: May 19, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of isopropanol from isopropyl acetate and water by extractive distillation
    Patent number: 4666560
    Abstract: Isopropanol cannot be completely removed from isopropanol - isopropyl acetate - water mixtures by distillation because of the presence of the minimum ternary azeoptrope. Isopropanol can be readily removed from mixtures containing it, isopropyl acetate and water by using extractive distillation in which the extractive agent is a higher boiling benzoate or nitro paraffin. Typical examples are methyl benzoate; methyl benzoate and nitromethane; butyl benzoate, nitromethane and nitroethane.
    Type: Grant
    Filed: October 11, 1985
    Date of Patent: May 19, 1987
    Inventors: Lloyd Berg, Mark G. Vosburgh
  • Separation of methyl t-butyl ether from hydrocarbons by extractive distillation
    Patent number: 4661209
    Abstract: Methyl t-butyl ether cannot be separated from close boiling hydrocarbons by distillation because of the proximity of their boiling points. Methyl t-butyl ether can be readily separated from close boiling hydrocarbons by using extractive distillation in which the extractive agent is higher boiling oxygenated, nitrogenous and/or sulfur containing organic compound or a mixture of two or more of these. Typical examples of effective agents are dimethylsulfoxide; dimethylsulfoxide and 2-octanone; dimethylsulfoxide, dimethylformamide and N-methyl pyrrolidone.
    Type: Grant
    Filed: August 1, 1986
    Date of Patent: April 28, 1987
    Inventor: Lloyd Berg
  • Dehydration of ethanol by extractive distillation
    Patent number: 4654123
    Abstract: Water cannot be completely removed from ethanol by distillation because of the presence of the minimum azeotrope. Ethanol can be readily dehydrated by using extractive distillation in which the water is removed as overhead product and the ethanol and extractive agent as bottoms and subsequently separated by conventional rectification. Typical examples of suitable extractive agents are hexahydrophthalic anhydride; methyl tetrahydrophthalic anhydride and pentanol-1; trimellitic anhydride, ethyl salicylate and resorcinol.
    Type: Grant
    Filed: January 2, 1986
    Date of Patent: March 31, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Dehydration of formic acid by extractive distillation
    Patent number: 4642166
    Abstract: Formic acid cannot be completely removed from formic acid - water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from mixtures containing it and water by using extractive distillation in which the extractive distillation agent is a sulfone. Typical examples of effective agents are thiophan sulfone; dimethyl sulfone and adiponitrile; phenyl sulfone, adiponitrile and acetophenone.
    Type: Grant
    Filed: February 10, 1986
    Date of Patent: February 10, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Separation of isobutyl acetate from isobutanol by extractive distillation
    Patent number: 4642167
    Abstract: Isobutyl acetate cannot be completely removed from isobutyl acetate--isobutanol--water mixtures by distillation because of the presence of the minimum ternary azeotrope. Isobutyl acetate can be readily removed from mixtures containing it, isobutanol and water by using extractive distillation in which the extractive distillation agent is a higher boiling oxygenated, nitrogenous and/or sulfur containing organic compound or a mixture of these. Typical examples of effective agents are N,N-dimethylacetamide; dimethylformamide and dimethylsulfoxide; acetamide, dimethylformamide and dipropylene glycol.
    Type: Grant
    Filed: March 7, 1985
    Date of Patent: February 10, 1987
    Inventors: Lloyd Berg, An-I Yeh
  • Dehydration of ethanol by extractive distillation
    Patent number: 4631115
    Abstract: Water cannot be completely removed from ethanol by distillation because of the presence of the minimum azeotrope. Ethanol can be readily dehydrated by using extractive distillation in which the water is removed as overhead product and the ethanol and extractive agent as bottoms and subsequently separated by conventional rectification. Typical examples of suitable extractive agents are methyl benzoate; trimellitic anhydride and methyl benzoate; dipropylene glycol dibenzoate, ethyl salicylate and resorcinol.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: December 23, 1986
    Inventors: Lloyd Berg, An-I Yeh