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Patent US3884965A successfully refreshed from Google Patents.
US3884965A
Expired / Lapsed
US
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Vicinal glycol ester purification process
Assignee: Halcon Research and Development Corp
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Filing: 1973-04-30
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Granted: 1975-05-20
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Expires: 1993-04-30
Abstract
Abstract Esters of C2-C3 vicinal glycols with C1-C5 hydrocarbon carboxylic acids are at least partially freed from organic halogen compound impurities by introducing the impuritycontaining glycol esters into contact with compounds of selected metals, the ratio of total equivalents of metal to total equivalents of halogen during such contact being in excess of 1: 1. Following such contact, the vicinal glycol ester possesses a reduced concentration of organo-halogen compound impurities and can readily be separated from inorganic halogen residues.
Inventors
- 👤 John Kollar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:54
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/60; C07C67/04; C07C67/05; C07C67/055; C07C67/28; C07C67/29
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
41 words
A PROCESS FOR PURIFICATION OF C1-C5 HYDROCARCON CARBOXYLIC ACID ESTERS OF (C2-C3) VICINAL ETHYLENE AND PROPYLENE GLYCOLS CONTAINING LESS THAN 5 WT.% WATER, SAID ESTERS CONTAINING ORGANIC HALOGEN COMPOUND IMPURITIES PREDOMINATING IN AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF:
Claim 2
Dependent Claim
41 words
A PROCESS FOR PURIFICATION OF C1-C5 HYDROCARCON CARBOXYLIC ACID ESTERS OF (C2-C3) VICINAL ETHYLENE AND PROPYLENE GLYCOLS CONTAINING LESS THAN 5 WT.% WATER, SAID ESTERS CONTAINING ORGANIC HALOGEN COMPOUND IMPURITIES PREDOMINATING IN AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF:
Claim 3
Dependent Claim
23 words
A process in accordance with claim 1 wherein the temperature is in excess of 130*C. and the time is at least 3 minutes.
Claim 4
Dependent Claim
33 words
A process in accordance with claim 1 wherein the temperature is within the range of 130*-250*C. and the time is within the range of from at least 10 minutes to about 3 hours.
Claim 5
Dependent Claim
18 words
A process in accordance with claim 1 wherein the ester is an ethylene glycol ester of acetic acid.
Claim 6
Dependent Claim
18 words
A process in accordance with claim 3 wherein the ester is an ethylene glycol ester of acetic acid.
Claim 7
Dependent Claim
18 words
A process in accordance with claim 1 wherein the ester is a propylene glycol ester of acetic acid.
Claim 8
Dependent Claim
15 words
A process in accordance with claim 1 wherein the metal compound is a potassium compound.
Claim 9
Dependent Claim
19 words
A process in accordance with claim 1 wherein the metal compound is an alkali or alkaline earth metal compound.
Claim 10
Dependent Claim
26 words
A process in accordance with claim 8 wherein the metal compound is in the form of a carboxylate salt of an alkali or alkaline earth metal.
Claim 11
Dependent Claim
20 words
A process in accordance with claim 9 wherein the metal compound is in the form of a potassium carboxylate salt.
Claim 12
Dependent Claim
18 words
A process in accordance with claim 1 wherein the metal compound is a sodium or potassium carboxylate salt.
Claim 13
Dependent Claim
41 words
A process for purification of C1-C5 hydrocarbon carboxylic acid esters of vicinal ethylene and propylene glycols containing less than 5 wt. % water, said esters containing organic halogen compound impurities predominating in at least one member of the group consisting of:
Claim 14
Dependent Claim
41 words
A process for purification of C1-C5 hydrocarbon carboxylic acid esters of vicinal ethylene and propylene glycols containing less than 5 wt. % water, said esters containing organic halogen compound impurities predominating in at least one member of the group consisting of:
Claim 15
Dependent Claim
28 words
A process in accordance with claim 12 wherein the temperature iis in excess of 200*C. and the time recited in step (b) thereof is at least 0.5 second.
Claim 16
Dependent Claim
37 words
A process in accordance with claim 12 wherein the temperature is within the range between about 250*C. and about 400*C. and the contact time recited in step (b) thereof is between about 1 second and 1 minute.
Claim 17
Dependent Claim
19 words
A process in accordance with claim 12 wherein the metal compound is an alkali or alkaline earth metal compound.
Claim 18
Dependent Claim
26 words
A process in accordance with claim 15 wherein the metal compound is in the form of a carboxylate salt of an alkali or alkaline earth metal.
Claim 19
Dependent Claim
18 words
A process in accordance with claim 12 wherein the metal compound is a sodium or potassium carboxylate salt.
Claim 20
Dependent Claim
12 words
A process in accordance with claim 17 wherein the metal is potassium.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |