Patent US4073876A successfully refreshed from Google Patents.
US4073876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of glycol esters
Assignee: Halcon Research and Development Corp
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Filing: 1976-07-01
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Granted: 1978-02-14
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Expires: 1996-07-01
Abstract
Abstract In the preparation of glycol esters by the oxidation of an olefin in the presence of a catalyst comprising tellurium, wherein the accumulation of foreign metals in association with the tellurium catalyst component has an adverse effect upon the reaction, such foreign metals are maintained at low levels while the tellurium catalyst values are recovered for recycling in high yield by purging a portion of a high-boiling residual fraction produced in the distillation treatment of the reaction mixture and treating the purged portion with water and/or an aqueous alkaline solution.
Inventors
- 👤 Vijai P. Gupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:48
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/001; B; B01; B01J; B01J27/00; B01J27/28; B01J27/30; C07; C07C; C07C67/00; C07C67/04; C07C67/05; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A process for recovering tellurium values and removing contaminating metal components from a high-boiling tellurium-containing fraction obtained from the liquid reaction product produced in the manufacture of glycol esters by the molecular oxygen oxidation of an olefin in the presence of a carboxylic acid and a tellurium catalyst and containing contaminating metals in addition to the tellurium values, said high-boiling fraction comprising the highest boiling fraction produced by distillation of said liquid reaction product to recover the glycol esters therefrom, which comprises treating at least part of said fraction with water and/or an aqueous alkaline solution to produce an aqueous phase containing said contaminating metals and a precipitate containing substantially all of the tellurium values present in said fraction, and separating said precipitate from said aqueous phase.
Claim 2
Dependent Claim
127 words
A process for recovering tellurium values and removing contaminating metal components from a high-boiling tellurium-containing fraction obtained from the liquid reaction product produced in the manufacture of glycol esters by the molecular oxygen oxidation of an olefin in the presence of a carboxylic acid and a tellurium catalyst and containing contaminating metals in addition to the tellurium values, said high-boiling fraction comprising the highest boiling fraction produced by distillation of said liquid reaction product to recover the glycol esters therefrom, which comprises treating at least part of said fraction with water and/or an aqueous alkaline solution to produce an aqueous phase containing said contaminating metals and a precipitate containing substantially all of the tellurium values present in said fraction, and separating said precipitate from said aqueous phase.
Claim 3
Dependent Claim
30 words
A process as defined in claim 1, wherein said fraction is first treated with water and the precipitate from said treatment with water is treated with an aqueous alkaline solution.
Claim 4
Dependent Claim
138 words
In the preparation of glycol esters by the molecular oxidation of an olefin in the presence of a carboxylic acid and a tellurium catalyst, wherein the liquid reaction product is distilled to separate its components and to separate product glycol esters and wherein a high-boiling residual fraction containing the tellurium values is obtained, said high-boiling fraction comprising the highest boiling fraction produced by distillation of said liquid reaction product to recover the glycol esters therefrom, and said high-boiling fraction containing contaminating metals in addition to said tellurium values, the improvement which comprises treating at least part of said high-boiling fraction with water and/or an aqueous alkaline solution to produce an aqueous phase containing said contaminating metals and a precipitate containing substantially all of the tellurium values present in said fraction, and separating said precipitate from said aqueous phase.
Claim 5
Dependent Claim
138 words
In the preparation of glycol esters by the molecular oxidation of an olefin in the presence of a carboxylic acid and a tellurium catalyst, wherein the liquid reaction product is distilled to separate its components and to separate product glycol esters and wherein a high-boiling residual fraction containing the tellurium values is obtained, said high-boiling fraction comprising the highest boiling fraction produced by distillation of said liquid reaction product to recover the glycol esters therefrom, and said high-boiling fraction containing contaminating metals in addition to said tellurium values, the improvement which comprises treating at least part of said high-boiling fraction with water and/or an aqueous alkaline solution to produce an aqueous phase containing said contaminating metals and a precipitate containing substantially all of the tellurium values present in said fraction, and separating said precipitate from said aqueous phase.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |