US4280012A
Expired / Lapsed
US
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Method of removing chlorinated phenol impurities
Assignee: Dynamit Nobel AG
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Filing: 1979-03-01
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Granted: 1981-07-21
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Expires: 1999-03-01
Abstract
Abstract A method of removing an impurity of the group chlorinated dibenzo-p-dioxins, chlorinated dibenzofurans, chlorinated hydroxydiphenylethers and chlorinated diphenylethers from a substance containing the same which comprises contacting said substance with an agent which is hydrazine, acetylene, an acetylene derivative or a compound which under the processing conditions is a source of hydrazine or acetylene.
Inventors
- 👤 Albino Pastura
- 👤 Gerhard Kelbch
- 👤 Hans-Leo Hulsmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:46
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
76 words
A method of removing an impurity of the group chlorinated dibenzo-p-dioxins, chlorinated dibenzofurans, chlorinated hydroxydiphenylethers and chlorinated diphenylethers from a halogenated phenol composition containing said impurity which comprises contacting at 20° to 200° C. under a pressure of normal up to 15 atmospheres said composition containing halogenated phenol with 0.5 to 5 weight percent of an agent which is hydrazine, acetylene, or a compound which under the processing conditions is a source of hydrazine or acetylene.
Claim 2
Independent Claim
76 words
A method of removing an impurity of the group chlorinated dibenzo-p-dioxins, chlorinated dibenzofurans, chlorinated hydroxydiphenylethers and chlorinated diphenylethers from a halogenated phenol composition containing said impurity which comprises contacting at 20° to 200° C. under a pressure of normal up to 15 atmospheres said composition containing halogenated phenol with 0.5 to 5 weight percent of an agent which is hydrazine, acetylene, or a compound which under the processing conditions is a source of hydrazine or acetylene.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein said agent is an acetylene derivative and said derivative is a compound having the ethynylene group --C.tbd.C--.
Claim 4
Dependent Claim
19 words
A method according to claim 1 wherein said agent is a carbide which under the processing conditions releases acetylene.
Claim 5
Dependent Claim
19 words
A method according to claim 3 wherein said carbide is an alkaline or alkaline earth metal salt of acetylene.
Claim 6
Dependent Claim
12 words
A method according to claim 4 wherein said carbide is calcium carbide.
Claim 7
Dependent Claim
23 words
A method according to claim 1 wherein said agent is an organic acetylene derivative and said derivative is an acetylene dicarboxylic acid ester.
Claim 8
Dependent Claim
21 words
A method according to claim 1 wherein said agent is an organic acetylene derivative and said derivative is propiolic acid ester.
Claim 9
Dependent Claim
18 words
A method according to claim 1 wherein said agent comprises a naturally occurring oil containing an alkyne group.
Claim 10
Dependent Claim
25 words
A method according to claim 8 wherein said oil comprises a boleko oil, camomile oil from Matricaria inodorata or the ethereal oil from Artemisia vulgaris.
Claim 11
Dependent Claim
11 words
A method according to claim 1 wherein said agent is hydrazine.
Claim 12
Dependent Claim
17 words
A method according to claim 1 wherein the method is carried out in the presence of water.
Claim 13
Dependent Claim
18 words
A method according to claim 1 wherein after said substance is contacted with said agent water is added.
Claim 14
Dependent Claim
16 words
A method according to claim 11 wherein the method is carried out with application of heat.
Claim 15
Dependent Claim
24 words
A method according to claim 1 wherein ultraviolet light is applied to said substance during or after treatment of said substance with said agent.
Claim 16
Dependent Claim
24 words
A method according to claim 1 wherein the method is carried out in the presence of a catalyst comprising a metal or its compound.
Claim 17
Dependent Claim
26 words
A method according to claim 15 wherein said catalyst is a metal of Group VIII of the Periodic Table of the Elements or a compound thereof.
Claim 18
Dependent Claim
15 words
A method according to claim 15 wherein said catalyst comprises vanadium or a compound thereof.
Claim 19
Dependent Claim
11 words
A method according to claim 1 wherein the agent is acetylene.
Claim 20
Dependent Claim
25 words
A method according to claim 1 wherein said agent comprises a salt of acetylene and said method is carried out in the presence of water.
Claim 21
Dependent Claim
15 words
A method according to claim 1 wherein said substance is treated with an organic alkyne.
Claim 22
Dependent Claim
16 words
A method according to claim 20 wherein said organic alkyne is dissolved in an inert solvent.
Claim 23
Dependent Claim
28 words
A method according to claim 3 wherein said carbide is in a finely divided form and the method takes place in the presence of liquid or vaporous water.
Claim 24
Dependent Claim
12 words
A method according to claim 1 wherein said halogenated phenol is pentachlorophenol.
Claim 25
Dependent Claim
12 words
A method according to claim 1 wherein said halogenated phenol is tetrachlorophenol.
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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |