US4461920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isomerization of dichlorobutenes
Assignee: Denka Co Ltd
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Filing: 1980-02-12
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Granted: 1984-07-24
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Expires: 2000-02-12
Abstract
Abstract 3,4-Dichlorobutene-1 and 1,4-dichlorobutene-2 are isomerized in the presence of a catalyst of a combination of a copper compound or copper metal and at least one additive from the group of 1,3-diphenylguanidine, di-o-tolylguanidine, glycine ethyl ester hydrochloride and 2-amino-4-chlorophenol.
Inventors
- 👤 Higashi Ito
- 👤 Seiichi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:19
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/26; B01J31/28; B01J31/30; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0245; B01J31/0251; B01J31/04; C; C07; C07C; C07C17/00; C07C17/35; C07C17/358; B01J2231/00; B01J2231/50; B01J2231/52; B01J27/00; B01J27/06; B01J27/08; B01J27/122
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
82 words
In an isomerization reaction between 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 in the presence of a catalyst at 80° to 130° C., the improvement comprising: conducting the isomerization reaction in the presence of a catalyst which is a combination of a copper compound or copper metal and at least one additive selected from the group consisting of 1,3-diphenylguanidine, di-o-tolylguanidine, glycine ethyl ester hydrochloride and 2-amino-4-chlorophenol with the proviso that when said copper compound is cuprous chloride, said additive cannot be 1,3-diphenylguanidine, di-o-tolylguanidine or mixtures thereof.
Claim 2
Dependent Claim
82 words
In an isomerization reaction between 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 in the presence of a catalyst at 80° to 130° C., the improvement comprising: conducting the isomerization reaction in the presence of a catalyst which is a combination of a copper compound or copper metal and at least one additive selected from the group consisting of 1,3-diphenylguanidine, di-o-tolylguanidine, glycine ethyl ester hydrochloride and 2-amino-4-chlorophenol with the proviso that when said copper compound is cuprous chloride, said additive cannot be 1,3-diphenylguanidine, di-o-tolylguanidine or mixtures thereof.
Claim 3
Dependent Claim
12 words
The reaction of claim 1 wherein the copper compound is cuprous chloride.
Claim 4
Dependent Claim
15 words
The reaction of claim 1 wherein the copper compound is cupric naphthenate or cupric acetate.
Claim 5
Dependent Claim
18 words
The reaction of claim 1 wherein the copper compound is combined with glycine ethyl ester hydrochloride and/or 2-amino-4-chlorophenol.
Claim 6
Dependent Claim
16 words
The reaction of claim 1, 2, 3, or 4 wherein 3,4-dichlorobutene-1 is isomerized to form 1,4-dichlorobutene-2.
Claim 7
Dependent Claim
16 words
The reaction of claim 1, 2, 3 or 4 wherein 1,4-dichlorobutene-2 is isomerized to form 3,4-dichlorobutene-1.
Claim 8
Dependent Claim
22 words
The reaction of claim 1, wherein the concentration of said copper compound relative to dichlorobutene reactant ranges from 0.05 to 2 wt.%.
Claim 9
Dependent Claim
21 words
The reaction of claim 7, wherein the concentration of said copper compound relative to dichlorobutene ranges from 0.10 to 1.0 wt.%.
Claim 10
Dependent Claim
21 words
The reaction of claim 1, wherein the concentration of said additive relative to dichlorobutene reactant ranges from 0.05 to 4 wt.%.
Claim 11
Dependent Claim
20 words
The reaction of claim 9, wherein the concentration of said additive relative to dichlorobutene ranges from 0.15 to 2 wt.%.
Claim 12
Dependent Claim
66 words
In an isomerization reaction between 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 in the presence of a catalyst at 80° to 130° C., the improvement comprising: conducting the isomerization reaction in the presence of a catalyst which is a combination of a copper compound and at least one additive selected from the group consisting of 1,3-diphenylguanidine and di-o-tolylguanidine with the proviso that said copper compound can not be cuprous chloride.
Claim 13
Dependent Claim
66 words
In an isomerization reaction between 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 in the presence of a catalyst at 80° to 130° C., the improvement comprising: conducting the isomerization reaction in the presence of a catalyst which is a combination of a copper compound and at least one additive selected from the group consisting of 1,3-diphenylguanidine and di-o-tolylguanidine with the proviso that said copper compound can not be cuprous chloride.
Claim 14
Dependent Claim
15 words
The reaction of claim 11, wherein said copper compound is cupric naphthenate or cupric acetate.
Claim 15
Dependent Claim
55 words
In an isomerization reaction between 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 in the presence of a catalyst at 80° to 130° C., the improvement comprising: conducting the isomerization reaction in the presence of a catalyst which is a combination of an organic copper compound and at least one additive selected from the group consisting of 1,3-diphenylguanidine and di-o-tolylguanidine.
Claim 16
Dependent Claim
55 words
In an isomerization reaction between 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 in the presence of a catalyst at 80° to 130° C., the improvement comprising: conducting the isomerization reaction in the presence of a catalyst which is a combination of an organic copper compound and at least one additive selected from the group consisting of 1,3-diphenylguanidine and di-o-tolylguanidine.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |