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Device and method for catalytically cracked gasoline and diesel oil coupling desulfurization

A catalytic cracking gasoline and catalytic cracking diesel technology, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of increasing equipment investment and processing steps, and achieves the reduction of investment and operating costs, easy process control, The effect of mild operating conditions

Inactive Publication Date: 2008-07-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The disadvantage of the prior art is that the high-boiling sulfides generated by the alkylation reaction still exist in the heavy fraction of gasoline, and it is necessary to set up a hydrotreating device to desulfurize the heavy fraction of gasoline. Compared with the direct hydrodesulfurization process, Although olefin saturation is avoided, equipment investment and processing steps are increased

Method used

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  • Device and method for catalytically cracked gasoline and diesel oil coupling desulfurization

Examples

Experimental program
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Effect test

Embodiment 1

[0028] FCC gasoline contains the following components and their mass content: aromatics 14.5%, olefins 31.5%, saturated hydrocarbons 54%, sulfide 296ppm; FCC gasoline has an initial boiling point of 29°C and an end boiling point of 198°C; FCC diesel The initial boiling point is 199°C, the final boiling point is 384°C, and the sulfide is 3250ppm.

[0029] Using the device shown in Figure 1, the catalytic cracking gasoline is 50h -1 The space velocity is added to the catalytic cracking gasoline pretreater 1 equipped with LSI-600 ion exchange resin, the operating pressure of the pretreater is 0.7MPa, and the temperature is 80°C; Alkylation reactor 2, the reactor is filled with solid phosphoric acid and USY, the mass ratio of the two catalysts is 1:1, the reaction temperature is 150°C, the pressure is 3.0MP, and the space velocity is 5h -1 Add the effluent of the alkylation reactor from the middle of the sulfur transfer fractionation tower 3, the fractionation tower has 20 theore...

Embodiment 2

[0031] FCC gasoline contains the following components and their mass content: aromatics 20.6%, olefins 43.2%, saturated hydrocarbons 36.2%, sulfide 1980ppm; FCC gasoline has an initial boiling point of 33°C and an end boiling point of 183°C; the initial boiling point of diesel oil The point is 190°C, the final boiling point is 355°C, and the sulfide is 2800ppm.

[0032] Using the device shown in Figure 1, the catalytic cracking gasoline is 30h -1The space velocity is added to the catalytic cracking gasoline pretreater 1 equipped with NKC-9 ion exchange resin, the operating pressure of the pretreater is 0.1MPa, and the temperature is 20°C; the stream flowing out from the pretreatment is introduced into thiophene sulfur Alkylation reactor 2, the reactor is filled with NKC-9 sulfonic acid resin catalyst, the reaction temperature is 80°C, the pressure is 0.15MPa, and the space velocity is 20h -1 Add the effluent of the alkylation reactor from the middle of the sulfur transfer fra...

Embodiment 3

[0034] FCC gasoline contains the following components and their mass content: 45% aromatics, 18% olefins, 37% saturated hydrocarbons, and 950ppm sulfides; the initial boiling point of catalytic cracking gasoline is 46°C, and the final boiling point is 206°C; The point is 210°C, the final boiling point is 397°C, and the sulfide is 4150ppm.

[0035] Using the device shown in Figure 1, the catalytic cracked gasoline was used for 5h -1 The space velocity is added to the catalytic cracking gasoline pretreater 1 equipped with CT-175 ion exchange resin, the operating pressure of the pretreater is 0.2MPa, and the temperature is 40°C; Basement reactor 2, the reactor is filled with β molecular sieve and ZSM-5 molecular sieve, the mass ratio of the two catalysts is 2:1, the reaction temperature is 120°C, the pressure is 1.0MP, and the space velocity is 12h -1 Add the effluent of the alkylation reactor from the middle of the sulfur transfer fractionation tower 3, the fractionation tower ...

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Abstract

The invention relates to a device and a method for coupling and decarbolizing of catalytic cracking gasoline and kerosene, wherein a feed inlet of a preprocessor of the catalytic cracking gasoline is connected with a head tank of the catalytic cracking gasoline through a gasoline feeding pump; a discharge hole is connected with an inlet of a thiophene sulfide alkylation reactor through a pipeline; the outlet of an alkylation reactor is connected with the middle part of a sulfur transferring fractionating tower through the pipeline; a catalytic cracking kerosene input port is arranged at a stripping section of the fractionating tower and is connected with a catalytic cracking kerosene storage tank by the feeding pump; a desulfurated gasoline outlet is arranged on the top of the fractionating tower; a sulf-kerosene outlet is arranged at the bottom of the fractionating tower and is connected to a kerosene hydrodesulfurizing device through the pipeline; a product outlet arranged at the upper end of a kerosene hydrogenation plant is connected with a gas-liquid separator through the pipeline; a desulfurated kerosene outlet is arranged at the lower end of the gas-liquid separator. The invention has the advantages that through a corporate distillation of gasoline and kerosene, sulfur in the gasoline is transferred into the kerosene, and sulfur in gasoline fraction is desorbed without losing octane value, thus omitting the process of gasoline hydrodesulfurizing and lowering total investment and operation expenses.

Description

technical field [0001] The invention relates to a coupling device for catalytic cracking gasoline and diesel oil and a desulfurization method, belonging to petroleum refining technology. Background technique [0002] FCC gasoline is the main blending component of finished gasoline in my country, and more than 90% of the sulfur impurities in finished gasoline come from FCC gasoline. Therefore, reducing the sulfur content in FCC gasoline significantly is the key to producing clean gasoline. More than 80% of the sulfides contained in catalytic cracked gasoline are thiophenes, and the removal of thiophenes sulfides by hydrodesulfurization needs to be carried out under harsh conditions. At this time, the olefins in the light fraction are easily saturated at the same time. Lower gasoline octane rating. Alkylation desulfurization has the characteristics of mild operating conditions and no loss of gasoline octane number. [0003] Patents and literature...

Claims

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Application Information

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IPC IPC(8): C10G69/04
Inventor 李永红沈昕伟
Owner TIANJIN UNIV
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