Patents Assigned to Lloyd Berg
  • Separation of 4-methyl-2-pentanone from formic acid by extractive distillation with dimethylamides
    Patent number: 4994151
    Abstract: 4-Methyl-2-pentanone cannot be easily separated from formic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid by extractive distillation using dimethylamides. Typical effective agents are dimethylformamide; dimethylacetamide and acetyl salicyclic acid; dimethylacetamide, heptanoic acid and methyl benzoate.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: February 19, 1991
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, George Bentu
  • Removal of sulfur from petroleum coke with lime
    Patent number: 4981667
    Abstract: The sulfur in petroleum pitches and cokes can be converted to calcium sulfate instead of sulfur dioxide during combustion when calcium oxide or calcium carbonate is added to the molten pitch before burning.
    Type: Grant
    Filed: April 13, 1990
    Date of Patent: January 1, 1991
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, John W. Berg
  • Recovery of triethylene glycol from triols by azeotropic distillation
    Patent number: 4980033
    Abstract: Triethylene glycol cannot be easily separated from glycerine or 1,2,4-butanetriol by atmospheric or reduced pressure distillation because of the closeness of their boiling points. Triethylene glycol can be readily separated from glycerine or 1,2,4-butanetriol by azeotropic distillation. Effective agents are p-xylene, alphapinene and diisobutyl ketone.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: December 25, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of lactate esters by extractive distillation
    Patent number: 4975157
    Abstract: The lower lactate esters are difficult to separate one from another by conventional distillation or rectification because of the close proximity of their boiling points. Lactate esters can be readily separated from each other by extractive distillation. Typical examples of effective agents are: for methyl lactate from ethyl lactate, ethylene glycol; ethyl lactate from isopropyl lactate, diethylene glycol; isopropyl lactate from n-propyl lactate, isophorone; n-propyl lactate from butyl lactate, 2-hydroxyacetophenone.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: December 4, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of 2-methyl-butanol-1 from pentanol-1 by extractive distillation
    Patent number: 4969977
    Abstract: 2-Methyl butanol-1 cannot be completely removed from 2-methyl butanol-1-pentanol-1 mixtures by distillation because of the proximity of their boiling points. 2-methyl butanol-1 can be readily removed from mixtures of these alcohols by using extractive distillation in which the extractive agent is a mixture of aromatic carboxylic acids or aromatic carboxylic esters. Typical examples of effective agents are: benzoic acid, ethyl salicylate and salicylic acid; methyl benzoate, methyl p-hydroxy benzoate and phenyl salicylate.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: November 13, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of styrene from ethyl benzene or o-xylene by azeotropic or extractive distillation with esters
    Patent number: 4966656
    Abstract: Styrene cannot be easily removed from ethyl benzene or o-xylene by distillation because of the closeness of their boiling points. Styrene can be readily separated from ethyl benzene or o-xylene by means of azeotropic or extractive distillation using certain esters. Typical effective agents are ethyl isovalerate, propyl caproate, butyl propionate and hexyl formate.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: October 30, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Recovery of ethylene glycol from butanediol isomers by azeotropic distillation
    Patent number: 4966658
    Abstract: Ethylene glycol cannot be easily separated from 1,2-butanediol or 1,3-butanediol by atmospheric or reduced pressure distillation because of the closeness of their boiling points. Ethylene glycol can be readily separated from the butanediols by azeotropic distillation. Typical effective agents are ethyl benzene, 3-heptanone or diisobutyl ketone.
    Type: Grant
    Filed: July 5, 1990
    Date of Patent: October 30, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of styrene from ethyl benzene by extractive distillation
    Patent number: 4959128
    Abstract: Ethyl benzene cannot be easily removed from styrene by distillation because of the closeness of their boiling points. Ethyl benzene can be readily separated from styrene by means of extractive distillation using certain nitrogenous organic compounds. Typical effective agents are adiponitrile, methyl glutaronitrile and nitrobenzene.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: September 25, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of 3-methyl-2-butanone from formic acid by extractive distillation with sulfolane
    Patent number: 4957595
    Abstract: 3-Methyl-2-butanone cannot be separated from formic acid by distillation because of the presence of the maximum boiling azotrope. 3-Methol-2-butanoe can be readily removed from formic acid by extractive distillation using sulfolane. Typical effective agents are: sulfolane and ethylene glycol diacetate; sulfolane, m-toluic acid and anisole.
    Type: Grant
    Filed: November 7, 1989
    Date of Patent: September 18, 1990
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, George Bentu
  • Separation of formic acid from dioxane by extractive distillation with amides
    Patent number: 4948469
    Abstract: Dioxane cannot be completely removed from dioxane and formic acid mixtures by distillation because of the presence of the maximum azeotrope. Dioxane can be readily removed from dioxane - formic acid mixtures by extractive distillation in which the extractive agent is dimethylformamide, dimethylacetamide or these with certain high boiling organic compounds.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: August 14, 1990
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, Richard R. Rall
  • Separation of 4-methyl-2-pentanone from formic or acetic acid by extractive distillation with sulfolane
    Patent number: 4948471
    Abstract: 4-Methyl-2-pentanone cannot be easily separated from formic acid or acetic acid by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanone can be readily removed from formic acid or acetic acid by extractive distillation. Typical effective agents are sulfolane; sulfolane and heptanoic acid; sulfolane, azelaic acid and ethylene glycol diacetate.
    Type: Grant
    Filed: August 1, 1989
    Date of Patent: August 14, 1990
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, George Bentu
  • Separation of n-propanol from t-amyl alcohol by extractive distillation
    Patent number: 4935103
    Abstract: n-Propanol and t-amyl alcohol cannot be separated from each other by distillation because of the proximity of their boiling points. n-Propanol can be readily separated from t-amyl alcohol 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: methyl salicylate; benzyl benzoate and hexahydrophthalic anhydride; methyl salicylate, benzoic acid and hexahydrophthalic anhydride.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: June 19, 1990
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, Robert W. Christensen
  • Dehydration of formic acid by extractive distillation
    Patent number: 4935100
    Abstract: Formic acid cannot be completely removed from formic acid and water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from formic acid - water mixtures by extractive distillation in which the extractive agent is a benzoic acid derivative mixed with certain higher boiling organic compounds. Examples of effective agents are: o-toluic acid and heptanoic acid; 2-benzoylbenzoic acid and methyl salicylate; p-hydroxybenzoic acid, pelargonic acid and 2-hydroxyacetophenone.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: June 19, 1990
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, Kraig M. Wendt, Rudolph J. Szabados
  • Separation of 2,3-butanediol from propylene glycol by azeotropic distillation
    Patent number: 4935102
    Abstract: A complex mixture of polyols cannot be easily separated by atmospheric or reduced pressure distillation because of the closeness of their boiling points. A mixture of polyols can be readily separated by azeotropic distillation. Typical effective agents are: p-xylene for propylene glycol from 2,3-butanediol and 1,2-butanediol; diisobutyl ketone for ethylene glycol from 1,2-butanediol and 1,3-butanediol; dipentene for glycerine from triethylene glycol and 1,2,4-butanetriol; propylene glycol isobutyl ether for 2,3-butanediol from propylene glycol.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: June 19, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of m-diisopropylbenzene from p-diisopropylbenzene by azeotropic distillation with alcohols
    Patent number: 4935579
    Abstract: Meta and para-diisopropylbenzenes cannot be easily separated from each other by distillation because of the closeness of their vapor pressures. m-Diisopropylbenzene can be readily removed from p-diisopropylbenzene by azeotropic distillation using certain alcohols. Typical effective azeotropic distillation agents are diethylene glycol butyl ether, diethylene glycol methyl ether and o-isopropyl phenol.
    Type: Grant
    Filed: December 1, 1988
    Date of Patent: June 19, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of benzene from acetone by azeotropic distillation
    Patent number: 4931145
    Abstract: Acetone cannot be easily separated from benzene in high purity by distillation because of the closeness of their vapor pressures. Acetone can be readily removed from benzene by azeotropic distillation using certain aromatic hydrocarbons. Typical effective azeotropic distillation agents are: toluene, ethyl benzene and mesitylene.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: June 5, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of vinyl acetate from ethyl acetate by extractive distillation with acids or acid amides
    Patent number: 4925533
    Abstract: Vinyl acetate cannot be easily removed from ethyl acetate by distillation because of the closeness of their boiling points. Vinyl acetate can be readily separated from ethyl acetate by means of extractive distillation. Typical effective agents are formic acid, formamide and formic acid-formamide mixture.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: May 15, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of m-diisopropyl benzene from p-diisopropyl benzene by extractive distillation
    Patent number: 4904346
    Abstract: Meta and para-diisopropyl benzenes cannot be easily separated from each other by distillation because of the closeness of their vapor pressures. m-Diisopropyl benzene can be readily removed from p-diisopropyl benzene by extractive distillation using certain high boiling organic compounds. Effective extractive agents are diphenyl ether, dimethyl adipate, diisononyl adipate, tributyl phosphate and ethylene glycol phenyl ether.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: February 27, 1990
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg
  • Separation of vinyl acetate from ethyl acetate by extractive distillation
    Patent number: 4897161
    Abstract: Vinyl acetate cannot be easily removed from ethyl acetate by distillation because of the closeness of their boiling points. Vinyl acetate can be readily separated from ethyl acetate by means of extractive distillation using certain glycols or glycol ethers. Typical effective agents are 2-methyl -2,4-pentanediol, 1,3-butanediol, ethylene glycol methyl ether and diethylene glycol ethyl ether.
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: January 30, 1990
    Assignee: Lloyd Berg
    Inventors: Lloyd Berg, Marc W. Paffhausen
  • Separation of M-diisopropylbenzene from P-diisopropylbenzene by azeotropic distillation with esters
    Patent number: 4880505
    Abstract: Meta and para-diisopropylbenzenes cannot be easily separated from each other by distsillation because of the closeness of their vapor pressures. m-Diisopropylbenzene can be readily removed from p-diisopropylbenzene by azeotropic distillation using certain esters. Typical effective azeotropic distillation agents are methyl benzoate and diethylene glycol ethyl ether acetate.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: November 14, 1989
    Assignee: Lloyd Berg
    Inventor: Lloyd Berg