Patent US3838514A successfully refreshed from Google Patents.
Patent US3844914A successfully refreshed from Google Patents.
US3844914A
Expired / Lapsed
US
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Photolytic purification of aqueous solutions containing nitrophenol compounds
Assignee: Dow Chemical Co
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Filing: 1973-09-04
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Granted: 1974-10-29
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Expires: 1993-09-04
Abstract
Abstract Aqueous solutions contaminated with low concentrations of nitrophenol compounds such as 4,6-dinitro-ortho-secondary-butyl phenol and/or ortho-secondary-butyl-4-nitro-phenol-6- sulfonic acid are photolytically treated by exposure to ultraviolet light, and oxygen, at a pH of about 3.5 or less to reduce the quantity of said compounds in the aqueous solution without the formation of undesirable gummy residues.
Inventors
- 👤 C Murchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:19
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123; C; C02; C02F; C02F1/00; C02F1/30; C02F1/32; Y; Y02; Y02W; Y02W10/00; Y02W10/30; Y02W10/37
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
29 words
A METHOD OF TREATING AN AQUEOUS SOLUTION CONTAINING A NITROPHENOL COMPOUND TO DECOMPOSE SAID COMPOUND COMPRISING: IRRADIATING THE AQUEOUS SOLUTION CONTAINING A WITH ULTRAVIOLET RADIATION OF SUFFICIENTLY SHORT WAVELENGTH
Claim 2
Independent Claim
29 words
A METHOD OF TREATING AN AQUEOUS SOLUTION CONTAINING A NITROPHENOL COMPOUND TO DECOMPOSE SAID COMPOUND COMPRISING: IRRADIATING THE AQUEOUS SOLUTION CONTAINING A WITH ULTRAVIOLET RADIATION OF SUFFICIENTLY SHORT WAVELENGTH
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the nitrophenol compound is selected from the group consisting of 4,6-dinitro-ortho-secondary-butyl phenol (DN) and ortho-secondary-butyl-4-nitrophenol-6-sulfonic acid (NS).
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the nitrophenol compound is 4, 6-dinitro-ortho-secondary-butyl phenol (DN).
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the nitrophenol compound is ortho-secondary-butyl-4-nitrophenol-6-sulfonic acid (NS).
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the nitrophenol compound is p-nitrophenol.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the aqueous solution is saturated with oxygen during the irradiation thereof.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein the ultraviolet radiation has a wavelength of from about 2,000 to about 3,000 Angstrom units.
Claim 9
Dependent Claim
30 words
The method of claim 1 wherein the irradiation is continued for a period of time sufficient to deliver about 560 kw-hr of energy per pound of said compound present therein.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein the pH of the aqueous liquid is about 3.5.
Claim 11
Independent Claim
92 words
A method of treating an aqueous solution containing greater than about 30 ppm. of a nitrophenol compound to decompose said compound comprising: a. Acidifying the aqueous solution to a pH of about 3.5 or less, to precipitate a portion of said compound; b. removing a substantial portion of said precipitated compound from said aqueous solution; c. contacting said aqueous solution with oxygen, and d. irradiating said aqueous solution with ultraviolet radiation of sufficiently short wavelength for a sufficient period of time to decompose substantially all of said compound remaining in the solution.
Claim 12
Independent Claim
92 words
A method of treating an aqueous solution containing greater than about 30 ppm. of a nitrophenol compound to decompose said compound comprising: a. Acidifying the aqueous solution to a pH of about 3.5 or less, to precipitate a portion of said compound; b. removing a substantial portion of said precipitated compound from said aqueous solution; c. contacting said aqueous solution with oxygen, and d. irradiating said aqueous solution with ultraviolet radiation of sufficiently short wavelength for a sufficient period of time to decompose substantially all of said compound remaining in the solution.
Claim 13
Dependent Claim
23 words
The method of claim 10 wherein the nitrophenol compound is selected from the group consisting of 4,6-dinitro-ortho-secondary-butyl phenol (DN) and ortho-secondary-butyl-4-nitrophenol-6-sulfonic acid (NS).
Claim 14
Dependent Claim
13 words
The method of claim 10 wherein the nitrophenol compound is 4,6-dinitro-ortho-secondary-butyl phenol (DN).
Claim 15
Dependent Claim
13 words
The method of claim 10 wherein the nitrophenol compound is ortho-secondary-butyl-4-nitrophenol-6-sulfonic acid (NS).
Claim 16
Dependent Claim
11 words
The method of claim 10 wherein the nitrophenol compound is p-nitrophenol.
Claim 17
Dependent Claim
20 words
The method of claim 10 wherein the ultraviolet radiation has a wavelengthh of about 2,000 to about 3,000 Angstrom units.
Claim 18
Dependent Claim
13 words
The method of claim 10 wherein the aqueous solution is acidified with HCl.
References Cited (Backward Citations)
US3620944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |