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Isomerization process using metal-modified small crystallite mtt molecular sieve

a technology of molecular sieve and small crystallite, which is applied in the direction of catalytic naphtha reforming hydrocarbon oil treatment, etc., can solve the problem that none of the processes produced a molecular sieve with a small crystallite siz

Inactive Publication Date: 2008-04-10
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]b. a corresponding viscosity index of 95 or higher;
[0016]wherein a line fit to a chart of the pour points on an x-axis and the viscosity indexes on a y-axis has a slope of the line for y of zero or less; and wherein the yield of the two or more isomerized products boiling at 343° C. (650° F. ) or higher is 90 wt % or greater based on the feed.

Problems solved by technology

None of the processes produced a molecular sieve with a small crystallite size.

Method used

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  • Isomerization process using metal-modified small crystallite mtt molecular sieve

Examples

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example 1

Synthesis of Small Crystallite MTT Molecular Sieve

[0092]Small crystallite MTT molecular sieve was synthesized as follows: A Hastelloy C liner for a 5 gallon autoclave unit was used for the mixing of reagents and then in the subsequent thermal treatment. At a rate of 1500 RPM and for a period of ½ hour, the following components were mixed once they had been added in the order of description. 300 grams of a 1 Molar solution of N,N′ Diisopropyl imidazolium hydroxide was mixed into 4500 grams of water. The salt iodide was prepared as in U.S. Pat. No. 4,483,835, Example 8, and then subsequently was ion-exchanged to the hydroxide form using BioRad AG1-X8 exchange resin. 2400 grams of 1 N KOH were added. 1524 grams of Ludox AS-30 (30 wt % SiO2) were added. 1080 grams of Nalco's 1056 colloid sol (26 wt % SiO2 and 4 wt % Al2O3) were added. Last 181 grams of isobutylamine were stirred into the mixture. The rfiolar concentration of the amine Qb exceeded the molar concentration of the imidazo...

example 2

[0095]The product of Example 1 was calcined to 1100° F. in air with a ramp of 1 deg. C. / min (1.8 F / min)and plateaus of 250° F. for 3 hours, 1000 F for 3 hours and then 1100° F. for 3 hours. The calcined material retained its;x-ray crystallinity. The calcined zeolite was subjected to 2 ion-exchanges at 200° F. (using NH4 NO3) as has been previously described in U.S. Pat. No. 5,252,527. The ion-exchanged material was recalcined and then the microporosity measurements were explored, using a test procedure also described in U.S. Pat. No. 5,252,527. The new product, small crystallite MTT molecular sieve, had some unexpected differences vs. conventional SSZ-32.

[0096]The Ar adsorption ratio for small crystallite MTT molecular sieve (Ar adsorption at 87K between the relative pressures of 0.001 and 0.1) / (total Ar adsorption up to relative pressure of 0.1) is larger than 0.5. In one embodiment the Ar adsorption ratio is in the range of 0.55. to 0.70. In contrast for the conventional SSZ-32, t...

example 3

[0098]Small crystallite MTT zeolite was composited with alumina, extruded, dried, and calcined. The dried and calcined extrudate was impregnated with a solution containing both platinum and magnesium, and then finally dried and calcined. The overall platinum loading was 0.325 wt. %. This metal-modified catalyst was then tested for isomerization on a waxy 500N hydrocrackate feed having 21% wax, a kinematic viscosity at 100° C. of 10.218 mm2 / s, and a pour point of +51° C. Isomerization process conditions used were a LHSV of 1.0 hr−1, 4000 scf / bbl gas to oil ratio, and a total pressure of 2300 psig. Following isomerization the products were hydrofinished over a Pt / Pd silica alumina hydrofinishing catalyst at 450° F. The VI of the waxy 500N hydrocrackate feed was 122, and the VI of the solvent dewaxed waxy 500 hydrocrackate feed was 106 when solvent dewaxed at −18° C. The difference between the waxy VI and the catalytic isomerized product VI was only two (122-120), which was exceptional...

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Abstract

Dewaxing a hydrocarbon feed by isomerizing feed with catalyst comprising small crystallite molecular sieve having MTT framework, the catalyst containing at least one metal selected from the group consisting of Ca, Cr, Mg, La, Na, Pr, Sr, K and Nd, and at least one Group VIII metal. A dewaxing method to produce products boiling at 343° C. (650° F.) or higher with low pour points and high viscosity indexes wherein the line fit to the chart of the pour points and the viscosity indexes has a slope of zero or less. A dewaxing process, comprising isomerization dewaxing feed with a viscosity at 100° C. of 2.5 mm2 / s or greater over a metal-modified molecular sieve to produce products with low pour points and high viscosity indexes; the line fit to the chart of the pour points and the viscosity indexes has a slope of zero or less; and wherein the yield of products is high.

Description

[0001]This application claims benefit under 315 USC 119 of Provisional Application 60 / 828,193 filed Oct. 4, 2006.FIELD OF THE INVENTION[0002]This invention is directed to a process for isomerizing a feed which includes straight chain and slightly branched paraffins having 10 or more carbon atoms using a catalyst comprising a small crystallite MTT molecular sieve loaded with metals. This invention is also directed to dewaxing methods producing products with improved viscosity indexes at lower pour points.BACKGROUND OF THE INVENTION[0003]The production of Group II and Group III base oils employing hydroprocessing has become increasingly popular in recent years. Catalysts that demonstrate improved isomerization selectivity and conversion are continually sought. As discussed in U.S. Pat. No. 5,282,958, col. 1-2, the use of intermediate pore molecular sieves such as ZSM-22, ZSM-23, ZSM-35, SSZ-32, SAPO-11, SAPO-31, SM-3, SM-6 in isomerization and shape-selective dewaxing is well-known. O...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G73/02
CPCC10G45/64C10G2300/4012C10G2400/06C10G2400/10C10G2300/4018C10G2300/4025C10G2300/1022C10G2300/1051C10G2300/1062C10G2300/1081C10G2300/1085C10G2300/301C10G2300/302C10G2300/304C10G2300/4006C10G2300/107C10G69/04C10G73/02
Inventor ZONES, STACEY I.KRISHNA, KAMALA
Owner CHEVROU USA INC
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