US4233235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making diperoxyacids
Assignee: Procter and Gamble Co
•
Filing: 1979-02-26
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Granted: 1980-11-11
•
Expires: 1999-02-26
Abstract
Abstract A continuous process for making aliphatic diperoxyacids comprising continuously adding a dibasic acid having from about 8 to about 16 carbon atoms, sulfuric acid, hydrogen peroxide and water to a continuous stirred reactor. The diperoxyacid formed is continuously withdrawn from the reactor.
Inventors
- 👤 James B. Camden
- 👤 Mark L. McCarty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:42
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3955; C07; C07C; C07C407/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A continuous process for making diperoxyacids of the formula ##STR4## wherein n is from about 6 to about 14, said diperoxyacids having a crystalline form and an average crystal size substantially greater than about 19 microns, comprising: (a) continuously adding to a stirred reactor of temperature from about 15° C. to about 45° C. the following materials: (1) hydrogen peroxide; (2) water; (3) sulfuric acid; and (4) a dibasic acid of the formula ##STR5## wherein n is from about 6 to about 14; (b) continuously withdrawing from the reactor diperoxyacid product formed as a result of the oxidation of the dibasic acid; (c) filtering the diperoxyacid product; and (d) washing the diperoxyacid product with water and drying it; wherein the inlet flow rates to the reactor of sulfuric acid, hydrogen peroxide and water are sufficient to maintain a liquid concentration of about 60% to about 80% sulfuric acid, about 0.5% to about 15% hydrogen peroxide, and about 5% to about 39.5% water in the reactor.
Claim 2
Dependent Claim
165 words
A continuous process for making diperoxyacids of the formula ##STR4## wherein n is from about 6 to about 14, said diperoxyacids having a crystalline form and an average crystal size substantially greater than about 19 microns, comprising: (a) continuously adding to a stirred reactor of temperature from about 15° C. to about 45° C. the following materials: (1) hydrogen peroxide; (2) water; (3) sulfuric acid; and (4) a dibasic acid of the formula ##STR5## wherein n is from about 6 to about 14; (b) continuously withdrawing from the reactor diperoxyacid product formed as a result of the oxidation of the dibasic acid; (c) filtering the diperoxyacid product; and (d) washing the diperoxyacid product with water and drying it; wherein the inlet flow rates to the reactor of sulfuric acid, hydrogen peroxide and water are sufficient to maintain a liquid concentration of about 60% to about 80% sulfuric acid, about 0.5% to about 15% hydrogen peroxide, and about 5% to about 39.5% water in the reactor.
Claim 3
Dependent Claim
50 words
A process according to claim 1 wherein the inlet flow rates of sulfuric acid, hydrogen peroxide and water are sufficient to maintain a liquid concentration of about 60% to about 80% sulfuric acid, about 2% to about 15% hydrogen peroxide and about 5% to about 38% water in the reactor.
Claim 4
Dependent Claim
24 words
A process according to claim 2 wherein the aliphatic dibasic acid is dissolved in the sulfuric acid prior to being added to the reactor.
Claim 5
Dependent Claim
14 words
A process according to claim 3 wherein the aliphatic dibasic acid is dodecanedioic acid.
Claim 6
Dependent Claim
15 words
A process according to claim 2 wherein the reactor is a high speed, recycle reactor.
Claim 7
Dependent Claim
25 words
A process according to claim 2 where the reactor is a mixed reactor having both a stirred tank section and a high speed, recycle section.
Claim 8
Dependent Claim
24 words
A process according to claim 2 where the reactor is a mixed reactor having both a stirred tank section and a plug fow section.
Claim 9
Dependent Claim
25 words
A process according to claim 2 where the reactor is a mixed reactor having both a high speed, recycle section and a plug flow section.
Claim 10
Dependent Claim
28 words
A process according to claim 2 where the reactor is a mixed reactor having a stirred tank section, a high speed, recycle section and a plug flow section.
Claim 11
Dependent Claim
14 words
A process according to claim 1 wherein n is from 9 to about 14.
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |