US4026959A
Expired / Lapsed
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Low temperature isomerization process for isopropylnaphthalene (100 percent sieve catalyst)
Assignee: Wyeth Holdings LLC
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Filing: 1976-05-07
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Granted: 1977-05-31
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Expires: 1996-05-07
Abstract
Abstract A process for treating mixtures of isopropylnaphthalenes (IPN) obtained from any source and increasing the beta-isopropylnaphthalene content thereof by a batch or continuous isomerization reaction in the presence of a rare earth metal ammonium-exchanged, "Y Type" crystalline aluminosilicate catalyst. The process also includes disproportionation of higher alkylates of naphthalene, such as diisopropylnaphthalene, to increase the IPN content of said mixtures.
Inventors
- 👤 Herbert Rudolph Kemme
- 👤 James Frederick Russ
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:06
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2737; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
A process for increasing the beta-isopropylnaphthalene content of a mixture containing essentially naphthalene, alpha- and beta-isopropylnaphthalene and diisopropylnaphthalene, which comprises contacting said mixture with a diluted rare earth metal ammonium-exchanged, synthetic, crystalline "Y" type allumino-silicate catalyst at a temperature of from about 150° C. to 260° C., with a space velocity of from about 0.1 to 4 hour.sup. -1 , at a gauge pressure of from about 200 psi to 500 psi, said mixture having about 1 to 10 equivalents naphthalene per equivalent of propylene, removing residual naphthalene from the reaction product, and further contacting the naphthalene-free product with a rare earth metal ammonium-exchanged, 100% synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 70° C. to 175° C., at substantially atmospheric pressure, and recovering the product therefrom.
Claim 2
Dependent Claim
131 words
A process for increasing the beta-isopropylnaphthalene content of a mixture containing essentially naphthalene, alpha- and beta-isopropylnaphthalene and diisopropylnaphthalene, which comprises contacting said mixture with a diluted rare earth metal ammonium-exchanged, synthetic, crystalline "Y" type allumino-silicate catalyst at a temperature of from about 150° C. to 260° C., with a space velocity of from about 0.1 to 4 hour.sup. -1 , at a gauge pressure of from about 200 psi to 500 psi, said mixture having about 1 to 10 equivalents naphthalene per equivalent of propylene, removing residual naphthalene from the reaction product, and further contacting the naphthalene-free product with a rare earth metal ammonium-exchanged, 100% synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 70° C. to 175° C., at substantially atmospheric pressure, and recovering the product therefrom.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the diluent is alumina.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the diluent is silica.
Claim 5
Dependent Claim
132 words
A process for increasing the beta-isopropylnaphthalene content of a mixture containing essentially naphthalene, alpha- and beta-isopropylnaphthalene and diisopropylnaphthalene, which comprises contacting said mixture with a diluted rare earth metal ammonium-exchanged, synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 180° C. to 240° C., with a space velocity of from about 0.3 to 1.0 hour.sup. -1 , at a gauge pressure of from about 200 psi to 500 psi, said mixture having about 2 to 4 equivalents of naphthalene per equivalent of propylene, removing residual naphthalene from the reaction product, and further contacting the naphthalene-free product with a rare earth metal exchanged, 100% synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 90° C. to 110° C., at substantially atmospheric pressure and recovering the product therefrom.
Claim 6
Dependent Claim
132 words
A process for increasing the beta-isopropylnaphthalene content of a mixture containing essentially naphthalene, alpha- and beta-isopropylnaphthalene and diisopropylnaphthalene, which comprises contacting said mixture with a diluted rare earth metal ammonium-exchanged, synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 180° C. to 240° C., with a space velocity of from about 0.3 to 1.0 hour.sup. -1 , at a gauge pressure of from about 200 psi to 500 psi, said mixture having about 2 to 4 equivalents of naphthalene per equivalent of propylene, removing residual naphthalene from the reaction product, and further contacting the naphthalene-free product with a rare earth metal exchanged, 100% synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 90° C. to 110° C., at substantially atmospheric pressure and recovering the product therefrom.
Claim 7
Dependent Claim
10 words
The process of claim 4 wherein the diluent is alumina.
Claim 8
Dependent Claim
10 words
The process of claim 4 wherein the diluent is silica.
Claim 9
Dependent Claim
65 words
A process for increasing the beta-isopropylnaphthalene content of a mixture containing essentially naphthalene, alpha- and beta-isopropylnaphthalene and diisopropylnaphthalene, which comprises separating the naphthalene from said mixture and contacting the essentially naphthalene-free mixture with a rare earth metal ammonium-exchanged 100% synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 40° C. to 200° C. at substantially atmospheric pressure, and recovering the product therefrom.
Claim 10
Dependent Claim
65 words
A process for increasing the beta-isopropylnaphthalene content of a mixture containing essentially naphthalene, alpha- and beta-isopropylnaphthalene and diisopropylnaphthalene, which comprises separating the naphthalene from said mixture and contacting the essentially naphthalene-free mixture with a rare earth metal ammonium-exchanged 100% synthetic, crystalline "Y" type aluminosilicate catalyst at a temperature of from about 40° C. to 200° C. at substantially atmospheric pressure, and recovering the product therefrom.
Claim 11
Dependent Claim
25 words
A process according to claim 7 wherein from 1 to 3 parts by weight of isopropylnaphthalene mixture is used per part by weight of catalyst.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |