US5744670A
Expired / Lapsed
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Process for preparing dialkylnaphthalene
Assignee: Kobe Steel Ltd
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Filing: 1996-06-10
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Granted: 1998-04-28
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Expires: 2016-06-10
Abstract
Abstract A process for producing alkylnaphthalene from a feedstock comprising isomers of dialkylnaphthalene and naphthalene by contacting the feedstock with a catalyst composition, in which the process comprising transalkylation between isomers of dialkylnaphthalene and naphthalene to produce monoalkylnaphthalene, and isomerization of dialkylnaphthalene, wherein the catalyst composition comprising a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing as set forth in Table A of the specification.
Inventors
- 👤 Masahiro Motoyuki
- 👤 Koji Yamamoto
- 👤 John Paul McWilliams
- 👤 Robert Glenn Bundens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:04
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185; C08G63/187; C08G63/189; C07; C07C; C07C15/00; C07C15/20; C07C15/24; C07C6/00; C07C6/08; C07C6/12; C07C6/126; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/70
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
57 words
A process comprising: contacting a feedstock comprising isomers of dialkylnaphthalene and naphthalene with a catalyst composition resulting in transalkylation between isomers of dialkylnaphthalene and said naphthalene to produce monoalkylnaphthalene; and isomerisation of isomers of dialkylnaphthalene to produce a dialkylnaphthalene isomerizate, wherein said catalyst composition comprises a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing
Claim 2
Dependent Claim
57 words
A process comprising: contacting a feedstock comprising isomers of dialkylnaphthalene and naphthalene with a catalyst composition resulting in transalkylation between isomers of dialkylnaphthalene and said naphthalene to produce monoalkylnaphthalene; and isomerisation of isomers of dialkylnaphthalene to produce a dialkylnaphthalene isomerizate, wherein said catalyst composition comprises a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing
Claim 3
Dependent Claim
20 words
36±0.4 11.03±0.2 8.83±0.14 6.18±0.12 6.00±0.10 4.06±0.07 3.91±0.07 3.42±0.06 Å wherein said process produces an increase in the amount of 2,6-dialkylnaphthalene.
Claim 4
Dependent Claim
20 words
36±0.4 11.03±0.2 8.83±0.14 6.18±0.12 6.00±0.10 4.06±0.07 3.91±0.07 3.42±0.06 Å wherein said process produces an increase in the amount of 2,6-dialkylnaphthalene.
Claim 5
Dependent Claim
19 words
The process of claim 1, wherein said feedstock comprises less than 11 weight % of 2,6-dialkylnaphthalene in said isomers.
Claim 6
Dependent Claim
19 words
The process of claim 1, wherein monoalkylnaphthalene is produced at a molar ratio of 2-monoalkylnaphthalene/1-monoalkylnaphthalene of more than 2.0.
Claim 7
Dependent Claim
16 words
The process of claim 1, wherein a product molar ratio of 2,6-dialkylnaphthalene/2,7-dialkylnaphthalene is more than 1.2.
Claim 8
Dependent Claim
21 words
The process of claim 1, wherein a molar ratio of 2,6-dialkylnaphthalene after isomerization / 2,6-dialkylnaphthalene before isomerization is more than 1.5.
Claim 9
Dependent Claim
10 words
The process of claim 1, further comprising separating said monoalkylnaphthalene.
Claim 10
Dependent Claim
43 words
The process of claim 6, further comprising contacting said monoalkylnaphthalene with an alkylating agent and an alkylation catalyst composition to produce an alkylate containing 2,6-dialkylnaphthalene, wherein said alkylation catalyst composition comprises a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing
Claim 11
Dependent Claim
9 words
36±0.4 11.03±0.2 8.83±0.14 6.18±0.12 6.00±0.10 4.06±0.07 3.91±0.07 3.42±0.06 Å
Claim 12
Dependent Claim
9 words
36±0.4 11.03±0.2 8.83±0.14 6.18±0.12 6.00±0.10 4.06±0.07 3.91±0.07 3.42±0.06 Å
Claim 13
Dependent Claim
17 words
The process of claim 7, wherein said alkylate has a ratio of 2,6-dialkylnaphthalene/2,7-dialkylnaphthalene of more than 1.1.
Claim 14
Dependent Claim
121 words
A process for producing 2,6-dialkylnaphthalene from a feedstock comprising isomers of dialkylnaphthalene and naphthalene comprising: I) transalkylating isomers of dialkylnaphthalene and said naphthalene to produce monoalkylnaphthalene; and isomerizing isomers of dialkylnaphthalene to produce a dialkylnaphthalene isomerizate; II) separating the product of step I) into fractions of naphthalene, monoalkylnaphthalene and dialkylnaphthalene; III) alkylating said fraction of monoalkylnaphthalene of step II) with an alkylating agent to produce dialkylnaphthalene; IV) separating the product of step III) into fractions of monoalkylnaphthalene and dialkylnaphthalene; and V) separating 2,6-dialkylnaphthalene from said fractions of dialkylnaphthalene of steps II) and IV), wherein steps I) and III) are each conducted in the presence of a catalyst composition comprising a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing
Claim 15
Dependent Claim
121 words
A process for producing 2,6-dialkylnaphthalene from a feedstock comprising isomers of dialkylnaphthalene and naphthalene comprising: I) transalkylating isomers of dialkylnaphthalene and said naphthalene to produce monoalkylnaphthalene; and isomerizing isomers of dialkylnaphthalene to produce a dialkylnaphthalene isomerizate; II) separating the product of step I) into fractions of naphthalene, monoalkylnaphthalene and dialkylnaphthalene; III) alkylating said fraction of monoalkylnaphthalene of step II) with an alkylating agent to produce dialkylnaphthalene; IV) separating the product of step III) into fractions of monoalkylnaphthalene and dialkylnaphthalene; and V) separating 2,6-dialkylnaphthalene from said fractions of dialkylnaphthalene of steps II) and IV), wherein steps I) and III) are each conducted in the presence of a catalyst composition comprising a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing
Claim 16
Dependent Claim
9 words
36±0.4 11.03±0.2 8.83±0.14 6.18±0.12 6.00±0.10 4.06±0.07 3.91±0.07 3.42±0.06 Å
Claim 17
Dependent Claim
9 words
36±0.4 11.03±0.2 8.83±0.14 6.18±0.12 6.00±0.10 4.06±0.07 3.91±0.07 3.42±0.06 Å
Claim 18
Dependent Claim
48 words
The process of claim 9 wherein said fraction of naphthalene of step II) is recycled to step I); said fraction of monoalkylnaphthalene of step IV) is recycled to step III); and a fraction of dialkylnaphthalene produced after separation of 2,6-dialkylnaphthalene of step V) is recycled to step I).
Claim 19
Dependent Claim
18 words
The process of claim 9, wherein 2,6-dialkylnaphthalene is separated from said fractions of dialkylnaphthalene by high pressure crystallization.
Claim 20
Dependent Claim
15 words
The process of claim 9 wherein said dialkylnaphthalene is dimethylnaphthalene and said monoalkylnaphthalene is monomethylnaphthalene.
Claim 21
Dependent Claim
45 words
The process of claim 1, wherein said catalyst composition comprises a synthetic zeolite characterized by an X-ray diffraction pattern including interplanar d-spacing and relative intensity I/I 0 ×100 12.36±0.4 M-VS 11.03±0.2 M-S 8.83±0.14 M-VS 6.18±0.12 M-VS 6.00±0.10 W-M 4.06±0.07 W-S 3.91±0.07 M-VS 3.42±0.06 Å VS.
References Cited (Backward Citations)
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