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Process for the desulfurization of olefinic gasolines by increasing the weight of sulfur-containing compounds with regeneration of the catalyst

a technology of olefinic gasoline and sulfur-containing compounds, which is applied in the field of desulfurization of olefinic gasoline, to achieve the effect of increasing the weight of sulfur-containing compounds

Inactive Publication Date: 2007-10-18
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019] This invention relates to a process for the desulfurization of sulfur-containing and olefin-containing gasoline. The principle of desulfurization consists in reacting, by an alkylation reaction, the olefins to the sulfur-containing compounds that are contained in the gasoline to be treated. The sulfur-containing compounds that constitute the effluents of the alkylation reaction are increased in weight relative to the initial sulfur-containing compounds such that the reaction that is used in the process is also described as a reaction for increasing the weight of the sulfur-containing compounds.
[0023] This invention describes in particular a method for regeneration of the catalyst that can be used without unloading the catalyst from the reactor and also optionally without interruption of the reaction for increasing the weight of sulfur-containing compounds. This procedure also makes it possible to keep the catalyst at a high activity level for its entire service life.
[0027] A second stage B for fractionation of the effluents that are obtained from the first stage A that makes it possible to produce a light fraction whose sulfur content is reduced relative to the feedstock and a heavy fraction that concentrates the sulfur-containing compounds that are increased in weight,

Problems solved by technology

The deactivation that is described above represents a major drawback for the process and in the long run requires the replacement of said catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0110] The following Example 1 shows the possibility of regenerating the catalyst that is used, here Amberlyst 15, by means of an aromatic regeneration fraction that consists of toluene.

[0111] A gasoline A that is sampled on a catalytic cracking unit is characterized by: [0112] a sulfur content of 450 ppm, including 110 ppm of thiophene, 20 ppm of mercaptans and 230 ppm of methyl thiophene, [0113] an olefin content of 48.7% by weight, [0114] a content of aromatic compounds of 5.4% by weight, and a distillation end point determined by simulated distillation of 132° C.

[0115] A reactor with a 50 ml volume is loaded with an acid resin that is marketed by the Rhom & Haas Company under the name of Amberlyst 15. [0116] In a first part of the experiment, the feedstock is brought into contact with the catalyst at a pressure of 2 MPa and a VVH of 1 h−1.

[0117] The initial temperature is 90° C. for a conversion of the thiophene of 99%. Then, the temperature is adjusted so as to carry out a co...

example 2

[0126] A feedstock B that consists of the gasoline A to which ethanol is added at a rate of 5% by weight is prepared. The gasoline A is treated under conditions that are identical to Example 1, with a new loading of Amberlyst 15 resin. [0127] In a first part of the experiment, the conversion rate of the gasoline A is kept at more than 90% by an increase of the temperature by increments of 10° C., as in Example 1. [0128] In the second part of the experiment, constituting the regeneration phase of the catalyst, the gasoline A is replaced by the gasoline B when the thiophene content in the feedstock reaches 18 ppm, which corresponds to a thiophene conversion rate of 82%, at 90° C. The gasoline B is injected under the same conditions of flow rate and pressure, and the temperature is increased to 110° C.

[0129] At the end of 24 hours from the beginning of the second part of the experiment, a sample of the reaction effluents is taken, and the measured thiophene content is 15 ppm, which co...

example 3

[0132] A feedstock C that consists of the gasoline A that is supplemented with toluene at a rate of 50% by weight is prepared. The gasoline A is treated under conditions that are identical to Example 1 with a new loading of Amberlyst 15 resin. [0133] In a first part of the experiment, the conversion rate of the gasoline A is kept at more than 90% by increasing the temperature by increments of 10° C., as in Example 1. [0134] In a second part of the experiment, constituting the regeneration phase of the catalyst, when the thiophene content in the feedstock reaches 15 ppm, which corresponds to a thiophene conversion level of 86%, at 90° C., the gasoline A is replaced by the gasoline B.

[0135] The gasoline B is injected under the same conditions of flow rate, pressure and temperature.

[0136] At the end of 24 hours from the beginning of the second part of the experiment, a sample of the reaction effluents is taken, and the measured thiophene content is 3 ppm, which corresponds to a thiop...

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Abstract

This invention relates to a process for the desulfurization of olefinic gasolines that employs a reaction for increasing the weight of sulfur-containing compounds by alkylation on the olefins of the feedstock, by means of an acidic catalyst, and that comprises a regeneration of the catalyst that can be carried out sequentially or continuously.

Description

FIELD OF THE INVENTION [0001] This invention relates to a process for the desulfurization of olefinic gasolines comprising a reaction for increasing the weight of sulfur-containing compounds by alkylation with the olefins that are contained in the feedstock by means of an acidic catalyst and comprising a phase for regeneration of said catalyst that can be carried out sequentially or continuously. [0002] This process particularly finds its application in the treatment of conversion gasolines, and in particular gasolines that are produced by catalytic cracking, coking, visbreaking or pyrolysis. [0003] The process that is the object of this invention makes it possible to upgrade a gasoline fraction that optionally comprises hydrocarbons with three or four carbon atoms, by reducing the total sulfur content of said fraction to very low levels, compatible with the current or future specifications, without significant reduction of the output of gasoline and the octane number. [0004] The pr...

Claims

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Application Information

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IPC IPC(8): C10G29/00
CPCB01J21/12C10G2400/02B01J27/16B01J27/182B01J27/285B01J29/90B01J31/0225B01J31/10B01J31/1616B01J31/26B01J31/4007B01J38/56C10G25/05C10G53/10C10G57/005C10G2300/4018C10G2300/104C10G2300/1044C10G2300/202B01J21/20
Inventor PICARD, FLORENTDANZO, THIERRY
Owner INST FR DU PETROLE
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