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Process for the conversion of lower alkanes to aromatic hydrocarbons

A technology for lower alkanes and aromatics, which is applied in the field of efficiency of aromatization catalysts, and can solve the problems of high temperature burning coke, slowness, and adverse effects on catalyst service life, etc.

Inactive Publication Date: 2012-07-18
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Burning coke is generally preferred for complete removal of accumulated coke deposits, but it must be handled in a relatively slow, carefully controlled manner to avoid excessive temperature increases that could lead to irreversible loss of active catalyst surface area
Catalyst service life will be adversely affected if the catalyst is subjected to substantial elevated temperature coking between exposure to lower alkane feed and aromatization conditions

Method used

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  • Process for the conversion of lower alkanes to aromatic hydrocarbons
  • Process for the conversion of lower alkanes to aromatic hydrocarbons
  • Process for the conversion of lower alkanes to aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This example illustrates one aspect of the lower alkane aromatization process operation / catalyst regeneration scheme of the present invention. Specifically, this example shows that reduced catalyst degradation and coke formation can be obtained by operating the process with rapid cycling between the hydrocarbon feed exposure and the hot hydrogen stripping steps, compared to continuous exposure to hydrocarbon feed. The opposite is true. The hydrocarbon feed for aromatization in this example consisted of 100% ethane.

[0067] Catalyst A was produced on cylindrical extruded particles with a diameter of 1.6 mm containing 80 wt% of zeolite ZSM-5CBV 2314 powder (SiO 2 / Al 2 o 3 The molar ratio was 30:1, available from Zeolyst International) and 20 wt% alumina binder. The extrudate samples were calcined in air up to 650°C to remove residual moisture prior to use in catalyst preparation. Catalyst A had a target metal loading of 0.025%w Pt and 0.09wt% Ga.

[0068] By first...

Embodiment 2

[0085] This example illustrates one aspect of the operation / catalyst regeneration scheme of the middle and lower alkane aromatization method of the present invention. Specifically, this example shows that reduced catalyst degradation and coke formation can be obtained by operating the process with rapid cycling between the hydrocarbon feed exposure and the hot hydrogen stripping steps, compared to continuous exposure to the hydrocarbon feed on the contrary. The hydrocarbon feed for aromatization in this example consisted of 50 wt% ethane and 50 wt% propane.

[0086] Catalyst B was produced on cylindrical extruded particles with a diameter of 1.6 mm containing 80 wt% of zeolite ZSM-5CBV 2314 powder (SiO 2 / Al 2 o 3The molar ratio was 23:1, available from Zeolyst International) and 20 wt% alumina binder. The extrudate samples were calcined in air up to 650°C to remove residual moisture prior to use in catalyst preparation. Catalyst B had a target metal loading of 0.025%w Pt...

Embodiment 3

[0107] In this example, a single catalyst charge was carried out through sequential experiments involving a hydrocarbon feed exposure / hydrogen stripping protocol (as described in Examples 1 and 2) and involving coke removal only or coke removal followed by Catalyst regeneration scheme for oxychlorination treatment. This example illustrates a possible operating procedure for use in a single lower alkane aromatization reactor in the process of the present invention. The hydrocarbon feed for aromatization in this example was 100% ethane.

[0108] In Performance Test 5, a fresh 15-cc charge of Catalyst A (see Example 1) was charged with 100% ethane and hydrogen vapor under the same conditions and in the same manner as described above for Performance Test 2 in Example 1. Test in rapid cycles between lifts. The cumulative total exposure time with ethane feed was 13.3 hours and the total run time was 39.9 hours. At the end of the experiment, ethane flow to the reactor was terminat...

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Abstract

The present invention provides a process for producing aromatic hydrocarbons which comprises: (a) alternately contacting a lower alkane feed with an aromatization catalyst under aromatization reaction conditions in a reactor for a short period of time, preferably 30 minutes or less, to produce aromatic reaction products and then contacting the aromatization catalyst with a hydrogen-containing gas at elevated temperature for a short period of time, preferably 10 minutes or less, (b) repeating the cycle of step (a) at least one time, (c) regenerating the aromatization catalyst by contacting it with an oxygen-containing gas at elevated temperature and (d) repeating steps (a) through (c) at least one time.

Description

technical field [0001] The present invention relates to a method for producing aromatic hydrocarbons from lower alkanes. More specifically, the present invention relates to methods of increasing the efficiency of aromatization catalysts used in dehydroaromatization processes. Background technique [0002] There is an expected global shortage of benzene, which is required for the manufacture of important petrochemicals such as styrene, phenol, nylon and polyurethane, among others. Typically, benzene and other aromatics are obtained by separating aromatic-rich feedstock fractions from non-aromatic hydrocarbons, such as reformate produced by catalytic reforming processes and naphtha cracking processes, using a solvent extraction process obtained from the pyrolysis of gasoline. [0003] In response to this anticipated supply shortfall, a number of catalysts and processes have been investigated for the production of aromatics, including benzene, exclusively from alkanes contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/00
CPCC07C2/76C07C2529/40C07C2529/44C07C2521/04Y02P20/584C07C15/00
Inventor M·V·伊耶A·M·劳里茨恩A·M·马奇维卡尔
Owner SHELL INT RES MAATSCHAPPIJ BV