US4105701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of materials containing carbonyl contaminants
Assignee: Celanese Corp
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Filing: 1975-04-28
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Granted: 1978-08-08
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Expires: 1995-04-28
Abstract
Abstract A liquid contaminated with a carbonyl compound, especially an aldehyde, is purified by being contacted with a bed of solid polyvinyl alcohol particles or fibers. The carbonyl compound is adsorbed or chemisorbed onto the solid polyvinyl alcohol surface with resulting reaction in the carbonyl content of the liquid.
Inventors
- 👤 Donald R. Larkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:52
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/88; C07C17/00; C07C17/38; C07C29/76; C07C67/00; C07C67/48; C07C67/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A method for removing an aldehyde contaminant from a liquid member of the group consisting of monochlorobenzene; the propanediols; the butanediols; vinyl acetate; glycerine; bis-(hydroxyethyl) terephthalate; and mixtures of bis-(hydroxyethyl) terephthalate with an inert solvent, which method comprises passing said liquid through a liquid-permeable bed of solids consisting essentially of polyvinyl alcohol and adsorbing said aldehyde upon said solids at a temperature which is between that at which said polyvinyl alcohol begins to soften and that at which said liquid solidifies.
Claim 2
Independent Claim
81 words
A method for removing an aldehyde contaminant from a liquid member of the group consisting of monochlorobenzene; the propanediols; the butanediols; vinyl acetate; glycerine; bis-(hydroxyethyl) terephthalate; and mixtures of bis-(hydroxyethyl) terephthalate with an inert solvent, which method comprises passing said liquid through a liquid-permeable bed of solids consisting essentially of polyvinyl alcohol and adsorbing said aldehyde upon said solids at a temperature which is between that at which said polyvinyl alcohol begins to soften and that at which said liquid solidifies.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said temperature is below about 100° C.
Claim 4
Independent Claim
79 words
A method for removing an aldehyde contaminant from a liquid member of the group consisting of monochlorobenzene; the propanediols; the butanediols; vinyl acetate; glycerine; bis-(hydroxyethyl) terephthalate; and mixtures of bis-(hydroxyethyl) terephthalate with chlorobenzene, which method comprises passing said liquid through a liquid-permeable bed of solids consisting essentially of polyvinyl alcohol and adsorbing said aldehyde upon said solids at a temperature which is between that at which said polyvinyl alcohol begins to soften and that at which said liquid solidifies.
Claim 5
Independent Claim
79 words
A method for removing an aldehyde contaminant from a liquid member of the group consisting of monochlorobenzene; the propanediols; the butanediols; vinyl acetate; glycerine; bis-(hydroxyethyl) terephthalate; and mixtures of bis-(hydroxyethyl) terephthalate with chlorobenzene, which method comprises passing said liquid through a liquid-permeable bed of solids consisting essentially of polyvinyl alcohol and adsorbing said aldehyde upon said solids at a temperature which is between that at which said polyvinyl alcohol begins to soften and that at which said liquid solidifies.
Claim 6
Dependent Claim
13 words
The method of claim 3 wherein said temperature is below about 100° C.
Claim 7
Independent Claim
41 words
A method for removing an aldehyde contaminant from liquid chlorobenzene, which method comprises passing said chlorobenzene through a liquid-permeable bed of solids consisting essentially of polyvinyl alcohol and adsorbing said aldehyde upon said solids at a temperature below about 100° C.
Claim 8
Independent Claim
41 words
A method for removing an aldehyde contaminant from liquid chlorobenzene, which method comprises passing said chlorobenzene through a liquid-permeable bed of solids consisting essentially of polyvinyl alcohol and adsorbing said aldehyde upon said solids at a temperature below about 100° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |