Helena Li Chum

Author:

Helena L. Chum

ISBN #:

0815512716

Author:

Helena L. Chum

ISBN #:

0841208689

Author:

Helena L. Chum

ISBN #:

0918249376

US Patent:

49649957, Oct 23, 1990

Filed:

Jun 16, 1989

Appl. No.:

7/368170

Inventors:

Helena L. Chum - Arvada CO
Giuseppe Filardo - Palermo, IT

Assignee:

Midwest Research Institute - Kansas City MO

International Classification:

B01D 1100

US Classification:

210634

Abstract:

A process is disclosed for separating low molecular weight components from complex aqueous organic mixtures. The process includes preparing a separation solution of supercritical carbon dioxide with an effective amount of an entrainer to modify the solvation power of the supercritical carbon dioxide and extract preselected low molecular weight components. The separation solution is maintained at a temperature of at least about 70. degree. C. and a pressure of at least about 1,500 psi. The separation solution is then contacted with the organic mixtures while maintaining the temperature and pressure as above until the mixtures and solution reach equilibrium to extract the preselected low molecular weight components from the organic mixtures. Finally, the entrainer/extracted components portion of the equilibrium mixture is isolated from the separation solution.

US Patent:

51361116, Aug 4, 1992

Filed:

Jun 7, 1991

Appl. No.:

7/710440

Inventors:

Helena L. Chum - Arvada CO
Robert J. Evans - Lakewood CO

Assignee:

MRI Ventures, Inc. - Kansas City MO

International Classification:

C07C 3700
C07C 3752

US Classification:

568806

Abstract:

A process of using fast pyrolysis in a carrier gas to convert a waste phenolic resin containing feedstreams in a manner such that pyrolysis of said resins and a given high value monomeric constituent occurs prior to pyrolyses of the resins in other monomeric components therein comprising: selecting a first temperature program range to cause pyrolysis of said resin and a given high value monomeric constituent prior to a temperature range that causes pyrolysis of other monomeric components; selecting, if desired, a catalyst and a support and treating said feedstreams with said catalyst to effect acid or basic catalyzed reaction pathways to maximize yield or enhance separation of said high value monomeric constituent in said first temperature program range to utilize reactive gases such as oxygen and steam in the pyrolysis process to drive the production of specific products; differentially heating said feedstreams at a heat rate within the first temperature program range to provide differential pyrolysis for selective recovery of optimum quantity of said high value monomeric constituent prior to pyrolysis of other monomeric components therein; separating said high value monomeric constituent; selecting a second higher temperature program range to cause pyrolysis of a different high value monomeric constituent of said phenolic resins waste and differentially heating said feedstreams at said higher temperature program range to cause pyrolysis of said different high value monomeric constituent; and separating said different high value monomeric constituent.

US Patent:

53590619, Oct 25, 1994

Filed:

Oct 27, 1992

Appl. No.:

7/943526

Inventors:

Robert J. Evans - Lakewood CO
Helena L. Chum - Arvada CO

Assignee:

Midwest Research Institute - Kansas City MO

International Classification:

C07D20112
C07C 400

US Classification:

540540

Abstract:

A process of using fast pyrolysis in a carrier gas to convert a plastic waste feedstream having a mixed polymeric composition in a manner such that pyrolysis of a given polymer to its high value monomeric constituent occurs prior to pyrolysis of other plastic components therein comprising: selecting a first temperature program range to cause pyrolysis of said given polymer to its high value monomeric constituent prior to a temperature range that causes pyrolysis of other plastic components; selecting a catalyst and support for treating said feed streams with said catalyst to effect acid or base catalyzed reaction pathways to maximize yield or enhance separation of said high value monomeric constituent in said temperature program range; differentially heating said feed stream at a heat rate within the first temperature program range to provide differential pyrolysis for selective recovery of optimum quantities of the high value monomeric constituent prior to pyrolysis of other plastic components; separating the high value monomeric constituents; selecting a second higher temperature range to cause pyrolysis of a different high value monomeric constituent of said plastic waste and differentially heating the feedstream at the higher temperature program range to cause pyrolysis of the different high value monomeric constituent; and separating the different high value monomeric constituent.

US Patent:

54646022, Nov 7, 1995

Filed:

Jan 9, 1995

Appl. No.:

8/370470

Inventors:

Robert J. Evans - Lakewood CO
Helena L. Chum - Arvada CO

Assignee:

Midwest Research Institute - Kansas City MO

International Classification:

F23G 712

US Classification:

423488

Abstract:

A process of pyrolyzing plastic waste feed streams containing polyvinyl chloride, polyethylene terephthalate, polystyrene and polyethylene to recover polystyrene HCl and terephthalic acid comprising: heating the plastic waste feed stream to a first temperature; adding an acid or base catalyst on an oxide or carbonate support; heating the plastic waste feed stream to pyrolyze polyethylene terephthalate and polyvinyl chloride; separating terephthalic acid or HCl; heating to a second temperature to pyrolyze polystyrene; separating styrene; heating the waste feed stream to a third temperature to pyrolyze polyethylene; and separating hydrocarbons.

US Patent:

50914995, Feb 25, 1992

Filed:

Dec 29, 1989

Appl. No.:

7/456653

Inventors:

Helena L. Chum - Arvada CO
Roland E. Kreibich - Auburn WA

Assignee:

Midwest Research Institute - Kansas City MO

International Classification:

C08G 804
C08J 8906
B32B 2108

US Classification:

528129

Abstract:

A process for preparing phenol-formaldehyde resole resins and adhesive compositions in which portions of the phenol normally contained in said resins are replaced by a phenol/neutral fractions extract obtained from fractionating fast-pyrolysis oils.

US Patent:

53590996, Oct 25, 1994

Filed:

Oct 27, 1992

Appl. No.:

7/943506

Inventors:

Robert J. Evans - Lakewood CO
Helena L. Chum - Arvada CO

Assignee:

Midwest Research Institute - Kansas City MO

International Classification:

C07D30708

US Classification:

549429

Abstract:

A process of using fast pyrolysis in a carrier gas to convert a plastic waste feedstream having a mixed polymeric composition in a manner such that pyrolysis of a given polymer to its high value monomeric constituent occurs prior to pyrolysis of other plastic components therein comprising: selecting a first temperature program range to cause pyrolysis of said given polymer to its high value monomeric constituent prior to a temperature range that causes pyrolysis of other plastic components; selecting a catalyst and support for treating said feed streams with said catalyst to effect acid or base catalyzed reaction pathways to maximize yield or enhance separation of said high value monomeric constituent in said temperature program range; differentially heating said feed stream at a heat rate within the first temperature program range to provide differential pyrolysis for selective recovery of optimum quantities of the high value monomeric constituent prior to pyrolysis of other plastic components; separating the high value monomeric constituents; selecting a second higher temperature range to cause pyrolysis of a different high value monomeric constituent of said plastic waste and differentially heating the feedstream at the higher temperature program range to cause pyrolysis of the different high value monomeric constituent; and separating the different high value monomeric constituent.

US Patent:

53211740, Jun 14, 1994

Filed:

Oct 27, 1992

Appl. No.:

7/943888

Inventors:

Robert J. Evans - Lakewood CO
Helena L. Chum - Arvada CO

Assignee:

Midwest Research Institute - Kansas City MO

International Classification:

C07C 100
C07C 400

US Classification:

585241

Abstract:

A process of using fast pyrolysis to convert a plastic waste feed stream containing polycarbonate and ABS to high value monomeric constituents prior to pyrolysis of other plastic components therein comprising: selecting a first temperature program range to cause pyrolysis of a given polymer to its high value monomeric constituents prior to a temperature range that causes pyrolysis of other plastic components; selecting an acid or base catalysts and an oxide or carbonate support for treating the feed stream to affect acid or base catalyzed reaction pathways to maximize yield or enhance separation of the high value monomeric constituents of polycarbonate and ABS in the first temperature program range; differentially heating the feed stream at a heat rate within the first temperature program range to provide differential pyrolysis for selective recovery of optimum quantities of the high value monomeric constituents prior to pyrolysis or other plastic components; separating the high value monomeric constituents from the polycarbonate to cause pyrolysis to a different high value monomeric constituent of the plastic waste and differentially heating the feed stream at the second higher temperature program range to cause pyrolysis of different high value monomeric constituents; and separating the different high value monomeric constituents.

US Patent:

52236013, Jun 29, 1993

Filed:

Jan 29, 1991

Appl. No.:

7/647020

Inventors:

Helena L. Chum - Arvada CO
Stuart K. Black - Denver CO
James P. Diebold - Lakewood CO
Roland E. Kreibich - Auburn WA

Assignee:

Midwest Research Institute Ventures, Inc. - Kansas City MO

International Classification:

C07C 3720
C08G 1402

US Classification:

528129

Abstract:

A process for preparing phenol-formaldehyde novolak resins and molding compositions in which portions of the phenol normally contained in said resins are replaced by a phenol/neutral fractions extract obtained from fractionating fast-pyrolysis oils. The fractionation consists of a neutralization stage which can be carried out with aqueous solutions of bases or appropriate bases in the dry state, followed by solvent extraction with an organic solvent having at least a moderate solubility parameter and good hydrogen bonding capacity. Phenolic compounds-containing/neutral fractions extracts obtained by fractionating fast-pyrolysis oils from a lignocellulosic material, is such that the oil is initially in the pH range of 2-4, being neutralized with an aqueous bicarbonate base, and extracted into a solvent having a solubility parameter of approximately 8. 4-9. 11 [cal/cm. sup. 3 ]. sup. 1/2 with polar components in the 1. 8-3.