Aliphatic gasoline component and process to prepare said gasoline component

a technology of aliphatic gasoline and gasoline formulation, which is applied in the direction of naphtha treatment, hydrocarbon oil treatment products, and alkylation treatment, etc., can solve the problems of difficult preparation of gasoline having an acceptable octane number from fischer-tropsch products, and the isomerised product will be predominantly mono-methylparaffins

Inactive Publication Date: 2007-09-20
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] The invention is directed to the following gasoline component. An aliphatic gasoline component comprising more than 90 wt % of a mixture of trimethyl substituted co

Problems solved by technology

Preparing a gasoline having an acceptable octane number from a Fischer-Tropsch product is however not straightforward.
A disadvantage of some of the above processes involving hydro-processing is that the isomerised product will be predominantly mono-methylparaffins.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples a-d

[0038] A Fischer-Tropsch product having the properties as listed in Table 1 was contacted with a hot regenerated catalyst at different temperatures and contact times at a catalyst to oil ratio of 4 kg / kg. The catalyst was a commercial FCC catalyst comprising an alumina matrix and Ultra Stable Zeolite Y, which had been obtained from a commercially operating FCC unit. The Zeolite Y content was 10 wt %. The operating conditions are presented in Table 3.

TABLE 1Initial boiling point100° C.Fraction boiling between 25 and 215° C. (wt %)46.8Fraction boiling between 215 and 325° C. (wt %)42.2Fraction boiling above 325° C. (wt %)11.0

examples 1-4

[0039] A Fischer-Tropsch product having the properties as listed in Table 2 was contacted with a hot regenerated catalyst at different temperatures and contact times as in Examples A-D. The Fischer-Tropsch product was obtained according to Example VII using the catalyst of Example III of WO-A-9934917. The operating conditions are presented in Table 3.

TABLE 2Initial boiling point280° C.Weight Fraction having 10 or less carbon0atoms (%)Weight Fraction having more than 30 carbon80atoms (%)Weight Fraction having more than 60 carbon50atoms (%)Ratio of C60+ / C30+0.63

[0040]

TABLE 3ContactTemperatureTimeExperimentExample(° C.)(seconds)A15004.06B2, 55250.7C3, 65254.06D4, 76250.7

[0041]

TABLE 4GasolineGasolineGasolineiso-iso-normalMiddleparaffinsolefinsolefinsGasolinedistillate(wt % in(wt % in(wt % inyieldyieldgasolinegasolinegasoline(wt %) (*)(wt %) (**)fraction)fraction)fraction)A—————174.0011.0631.0436.9618.09B52.5835.882.938.0014.27252.9013.2717.1050.1525.83C68.7013.6315.5916.938.14370.295....

examples 5-7

[0044] Examples 2-4 were repeated with the Fischer-Tropsch product having the properties as listed in Table 5 and the conditions of Table 3. The results are presented in Table 6.

TABLE 5Initial boiling point100° C.Weight Fraction having 10 or less carbon14atoms (%)Weight Fraction having more than 30 carbon62atoms (%)Weight Fraction having more than 60 carbon39atoms (%)Ratio of C60+ / C30+0.63

[0045]

TABLE 6GasolineGasolineiso-GasolinenormalGasolineparaffinsiso-olefinsolefinsyield (wt %)(wt % in(wt % in(wt % inon totalgasolinegasolinegasolineExampleproductfraction)fraction)fraction)552.8514.9143.6424.04670.059.7155.8423.30747.2512.9437.2529.87

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Abstract

An aliphatic gasoline component comprising more than 90 wt % of a mixture of trimethyl substituted compounds and monomethyl substituted compounds in a weight ratio of trimethyl to monomethyl compounds of at least 0.03 and wherein the compounds may be paraffins and olefins. The invention is also directed to a process to prepare an aliphatic gasoline component by (a) contacting a Fischer-Tropsch synthesis product with a catalyst system comprising a catalyst, which catalyst comprises an acidic matrix and a large pore molecular sieve in a riser reactor at a temperature of between 450 and 650° C. at a contact time of between 1 and 10 seconds and at a catalyst to oil ratio of between 2 and 20 k.g / kg, (b) isolating from the product of step (a) a gasoline fraction and a fraction comprising iso-butane and isobutylene; (c) subjecting the iso-butane and the iso-butylene obtained in step (b) to an alkylation step to prepare a trimethyl substituted pentane, and (d) combining the gasoline fraction obtained in step (b) with the product rich in trimethyl substituted pentane as obtained in step (c).

Description

FIELD OF THE INVENTION [0001] The invention is directed to an aliphatic gasoline component, a gasoline formulation and a process to prepare said gasoline component. BACKGROUND OF THE INVENTION [0002] It is known that paraffinic products boiling in the gasoline range can be prepared from a Fischer-Tropsch derived synthesis product. Preparing a gasoline having an acceptable octane number from a Fischer-Tropsch product is however not straightforward. This because the Fischer-Tropsch product as such consists for a large portion of normal paraffins which have a low octane value or contribution. Various attempts have been made to provide a process, which can prepare a gasoline having an acceptable octane value from a Fischer-Tropsch product. [0003] EP-A-512635 discloses a process wherein a gasoline having a motor octane number of 85 is obtained from a Fischer-Tropsch process by means of a hydroisomerisation process. The process also involves separation of normal and iso-paraffins using a ...

Claims

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Application Information

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IPC IPC(8): C10L1/04C10G2/00C10G11/02C10G11/05C10G55/06C10G57/00C10L1/06C10L1/08
CPCC10G2400/02C10L1/06Y10S208/95C10G2300/1022C10G63/04C10G55/06C10G57/005C10G2/332C10G11/02C10G2300/202C10G2300/305C10G2300/4006C10G2300/80
Inventor DIERICKX, JAN LODEWIJK MARIA
Owner SHELL OIL CO
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