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US4721813A
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US
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Method for the oxidation of mercaptoalkanols to dithiodiglycols
Assignee: Phillips Petroleum Co
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Filing: 1986-08-25
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Granted: 1988-01-26
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Expires: 2006-08-25
Abstract
Abstract A method for the conversion of mercaptoalkanols to dithiodiglycols having good color properties and low residual odor is provided. Mercaptalkanols are reacted in the presence of small amounts of anhydrous ammonia and an oxygen-containing gas in the absence of any metal-containing catalysts to produce the desired dithiodiglycol products.
Inventors
- 👤 Harold W. Mark
- 👤 John S. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:22
CPC Classifications
C; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A method for the conversion of a mercaptoalkanol having the structure: ##STR3## wherein each R and R' is independently either H or a C 1 to C 3 alkyl radical and x is a whole number ranging between 0 and 3, to a dithiodiglycol having the structure: ##STR4## which comprises contacting said mercaptoalkanol with an oxygen-containing gas and anhydrous ammonia, wherein the mole ratio of ammonia to said mercaptoalkanol is maintained below about 0.01:1.
Claim 2
Independent Claim
74 words
A method for the conversion of a mercaptoalkanol having the structure: ##STR3## wherein each R and R' is independently either H or a C 1 to C 3 alkyl radical and x is a whole number ranging between 0 and 3, to a dithiodiglycol having the structure: ##STR4## which comprises contacting said mercaptoalkanol with an oxygen-containing gas and anhydrous ammonia, wherein the mole ratio of ammonia to said mercaptoalkanol is maintained below about 0.01:1.
Claim 3
Dependent Claim
12 words
A method in accordance with claim 1 wherein said mercaptoalkanol is 2-mercaptoethanol.
Claim 4
Dependent Claim
26 words
A method in accordance with claim 1 wherein the ratio of ammonia to said mercaptoalkanol is maintained in the range of about 0.001:1 up to 0.006:1.
Claim 5
Dependent Claim
26 words
A method in accordance with claim 1 wherein said conversion is carried out at a temperature in the range of about 100° up to 200° F.
Claim 6
Dependent Claim
26 words
A method in accordance with claim 1 wherein said conversion is carried out at a pressure in the range of about 250 up to 400 psig.
Claim 7
Dependent Claim
26 words
A method in accordance with claim 1 wherein the contact time for said conversion is in the range of about 1 up to about 24 hours.
Claim 8
Dependent Claim
15 words
A method in accordance with claim 1 wherein said oxygencontaining gas is substantially pure oxygen.
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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |