US4477649A
Expired / Lapsed
US
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Two-stage continuous process for preparation of polyphenylene oxides
Assignee: General Electric Co
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Filing: 1983-03-25
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Granted: 1984-10-16
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Expires: 2003-03-25
Abstract
Abstract Polyphenylene oxides are prepared by the catalytic reaction of oxygen with a monohydroxy aromatic compound such as 2,6-xylenol in a two-stage continuous process. The first stage is effected in at least one and preferably no more than two tank reactors, and the second stage in a reaction system with limited back-mixing, typically a cylindrical reactor containing multiple agitated zones. In a preferred embodiment of the invention, the non-gaseous constituents of the reaction mixture are pre-mixed in an inert atmosphere.
Inventors
- 👤 David P. Mobley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:07
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/1862; C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00083; B01J2219/00087; B01J2219/00094; B01J2219/00164; B01J2219/00166
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
73 words
In a process for preparing polyphenylene oxides by the reaction of oxygen with at least one monohydroxy aromatic compound in the presence of a catalyst which is a combination of copper ions, bromide ions and at least one amine, the improvement which comprises carrying out said reaction continuously in two stages, the first stage being effected in at least one tank reactor and the second stage in a reaction system with limited back-mixing.
Claim 2
Dependent Claim
73 words
In a process for preparing polyphenylene oxides by the reaction of oxygen with at least one monohydroxy aromatic compound in the presence of a catalyst which is a combination of copper ions, bromide ions and at least one amine, the improvement which comprises carrying out said reaction continuously in two stages, the first stage being effected in at least one tank reactor and the second stage in a reaction system with limited back-mixing.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein one mole of copper is present per 100-1500 moles of monohydroxy aromatic compound.
Claim 4
Dependent Claim
20 words
A process according to claim 2 wherein the first stage takes place in one or two continuous-flow stirred tank reactors.
Claim 5
Dependent Claim
24 words
A process according to claim 3 wherein the reaction temperature in each of said tank reactors is in the range of about 10°-60° C.
Claim 6
Dependent Claim
19 words
A process according to claim 4 wherein at least about 65% conversion is achieved in the first tank reactor.
Claim 7
Dependent Claim
13 words
A process according to claim 5 wherein the monohydroxy aromatic compound is 2,6-xylenol.
Claim 8
Dependent Claim
20 words
A process according to claim 6 wherein water is removed from the reaction mixture after one or both tank reactors.
Claim 9
Dependent Claim
13 words
A process according to claim 6 wherein only one tank reactor is used.
Claim 10
Dependent Claim
12 words
A process according to claim 6 wherein two tank reactors are used.
Claim 11
Dependent Claim
25 words
A process according to claim 9 wherein the weight average molecular weight of the product is increased at least fivefold in the second tank reactor.
Claim 12
Dependent Claim
17 words
A process according to claim 3 wherein the second stage is effected in a continuous-flow tubular reactor.
Claim 13
Dependent Claim
15 words
A process according to claim 11 wherein the continuous-flow tubular reactor contains multiple reaction zones.
Claim 14
Dependent Claim
16 words
A process according to claim 12 wherein each zone of said continuous-flow tubular reactor is agitated.
Claim 15
Dependent Claim
16 words
A process according to claim 13 wherein the continuous-flow tubular reactor contains at least five zones.
Claim 16
Dependent Claim
19 words
A process according to claim 14 wherein the reaction temperature in the continuous-flow tubular reactor is about 20°-60° C.
Claim 17
Dependent Claim
13 words
A process according to claim 15 wherein the monohydroxy aromatic compound is 2,6-xylenol.
Claim 18
Dependent Claim
22 words
A process according to claim 16 wherein co-current flow of liquid feed stream and oxygen is employed in the continuous-flow tubular reactor.
Claim 19
Dependent Claim
41 words
A process according to claim 4, 7, 8, 9, 12 14, 15, 16 or 2 wherein the halide is bromide and the amine constituents of the catalyst mixture comprise at least one secondary alkylene diamine and at least one tertiary monoamine.
Claim 20
Dependent Claim
19 words
A process according to claim 18 wherein the secondary alkylene diamine is N,N'-di-t-butylethylenediamine and the tertiary monoamine is dimethyl-n-butylamine.
Claim 21
Dependent Claim
17 words
A process according to claim 18 wherein the catalyst mixture additionally contains at least one secondary monoamine.
Claim 22
Dependent Claim
26 words
A process according to claim 18 wherein the secondary alkylene diamine is N,N'-di-t-butylethylenediamine, the tertiary monoamine is dimethyl-n-butylamine, and the secondary monoamine is dimethylamine or di-n-butylamine.
Claim 23
Dependent Claim
16 words
A process according to claim 19 wherein the reaction mixture also contains a phase transfer catalyst.
Claim 24
Dependent Claim
38 words
A process according to claim 2, 4, 6, 8, 9, 12, 14, 15, 16 or 2 wherein the non-gaseous constituents are pre-mixed in an inert atmosphere to form a homogeneous mixture which is fed to the first stage.
Claim 25
Dependent Claim
28 words
A process according to claim 18 wherein the non-gaseous constituents are pre-mixed in an inert atmosphere to form a homogeneous mixture which is fed to the first stage.
Claim 26
Dependent Claim
28 words
A process according to claim 20 wherein the non-gaseous constituents are pre-mixed in an inert atmosphere to form a homogeneous mixture which is fed to the first stage.
Claim 27
Dependent Claim
28 words
A process according to claim 22 wherein the non-gaseous constituents are pre-mixed in an inert atmosphere to form a homogeneous mixture which is fed to the first stage.
References Cited (Backward Citations)
US3306874A
Cited
US3306875A
Cited
JPS4821798B1
Cited
US3789054A
Cited
JPS4845600A
Cited
JPS4855996A
Cited
JPS498597A
Cited
US3914266A
Cited
US4028341A
Cited
US3988297A
Cited
US4054553A
Cited
CS192278B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |