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US4526879A Expired / Lapsed US ⏱️ 0.0 years remaining

Synthesis of zeolite ZSM-5

Assignee: Mobil Oil AS
•
Filing: 1983-08-05
•
Granted: 1985-07-02
•
Expires: 2003-08-05
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Abstract

Abstract As synthesized by conventional technique, zeolite ZSM-5 is crystallized in the presence of substantial amount of tetraalkylammonium cations, the alkyl groups of which contain 2 to 5 carbon atoms, such as, for example, tetrapropylammonium. When synthesized in the conventional way, ZSM-5 contains tetraalkylammonium cations as well as a substantial amount of sodium ions. To obtain a more catalytically active form of ZSM-5, the sodium ions must be exchanged to very low levels. By synthesizing zeolite ZSM-5 according to the present method, i.e., in the presence of a combination of an amine and a halide in the presence of a mutual solvent and with a specifically defined reaction mixture composition, ZSM-5 having different organic nitrogen-containing cations but the same crystal structure as conventionally prepared ZSM-5 is obtained. The ZSM-5 prepared in accordance herewith is very low in sodium content as synthesized and has a crystal size of from about 0.05 microns to about 20 microns.

Inventors

  • 👤 Francis G. Dwyer
  • 👤 Pochen Chu

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 22:37
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/36; C01B39/38; C01B39/40; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; Y; Y10; Y10S; Y10S423/00; Y10S423/22

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 172 words
A method for preparing ZSM-5 having a crystal size of from about 0.03 micron to about 20 microns and an alkali metal content ranging from about 0.01 to about 0.20 weight percent which method comprises preparing a mixture containing sources of an alkali metal oxide, an aluminum oxide, a silicon oxide and a combination of a C 1 -C 6 primary alkylamine and a C 1 -C 6 alkyl halide in a ratio of amine to halide of from about 2:1 to about 10:1, and a solvent, said mixture having a composition, in mole ratios of oxides, within the following ranges: ______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 10-500 H.sub.2 O/SiO.sub.2 10-100 M/SiO.sub.2 0.1-2.0 R/SiO.sub.2 0.05-1.0 ______________________________________ wherein R represents the radical or mixture of radicals obtained from the association of said C 1 -C 6 alkyl amine and said C 1 -C 6 alkyl halide and M is an alkali metal or an alkaline earth cation, and reacting said mixture at from about 100° F. to about 350° F. until ZSM-5 crystallization is complete.
Claim 2
Independent Claim 172 words
A method for preparing ZSM-5 having a crystal size of from about 0.03 micron to about 20 microns and an alkali metal content ranging from about 0.01 to about 0.20 weight percent which method comprises preparing a mixture containing sources of an alkali metal oxide, an aluminum oxide, a silicon oxide and a combination of a C 1 -C 6 primary alkylamine and a C 1 -C 6 alkyl halide in a ratio of amine to halide of from about 2:1 to about 10:1, and a solvent, said mixture having a composition, in mole ratios of oxides, within the following ranges: ______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 10-500 H.sub.2 O/SiO.sub.2 10-100 M/SiO.sub.2 0.1-2.0 R/SiO.sub.2 0.05-1.0 ______________________________________ wherein R represents the radical or mixture of radicals obtained from the association of said C 1 -C 6 alkyl amine and said C 1 -C 6 alkyl halide and M is an alkali metal or an alkaline earth cation, and reacting said mixture at from about 100° F. to about 350° F. until ZSM-5 crystallization is complete.
Claim 3
Dependent Claim 15 words
The method of claim 1 wherein the alkyls of the amine and halide are different.
Claim 4
Dependent Claim 10 words
The method of claim 1 wherein the alkyls are propyl.
Claim 5
Dependent Claim 18 words
The method of claim 1 wherein said crystal size is from about 0.03 micron to about 0.15 micron.
Claim 6
Dependent Claim 11 words
The method of claim 1 wherein the solvent is methylethyl ketone.
Claim 7
Dependent Claim 14 words
The method of claim 1 wherein said ZSM-5 is combined with a hydrogenation component.
Claim 8
Dependent Claim 14 words
The method of claim 1 wherein said ZSM-5 is combined with a matrix material.
Claim 9
Dependent Claim 20 words
The method of claim 1 wherein the crystallization is carried out for from about 3 hours to about 180 days.

References Cited (Backward Citations)

GB1365318A Cited
US4151189A Cited
US4082805A Cited
US4025571A Cited
US4025572A Cited
US4139600A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-07-01 1988-12-31 1989-07-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-07-01 1992-12-31 1993-07-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-07-01 1996-12-31 1997-07-02 $7700.00 Window Closed / Lapsed

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