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A kind of C5/C6 alkane low-temperature isomerization method

A low-temperature isomerization and isomerization technology, which is applied in the field of light hydrocarbon isomerization, can solve the problems of increased coking tendency, lower isomerization rate of C5 hydrocarbons, lower isomerization rate, etc., to reduce heating and cooling energy consumption , Improve product octane number, improve the effect of isomerization rate

Active Publication Date: 2017-01-11
SHANGHAI HOTO PETROCHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty of isomerization of C5 hydrocarbons, the isomerized C5 hydrocarbons contained in the light components also inhibit the isomerization of normal C5 hydrocarbons, which will reduce the isomerization rate of C5 hydrocarbons, thereby affecting the octane number of the product
Moreover, the current isomerization reaction using a solid superacid as a catalyst generally has a reaction temperature above 220 degrees Celsius, which belongs to a medium-temperature isomerization reaction. Limited by the reaction balance, the isomerization rate is further reduced and the coking tendency is increased.

Method used

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  • A kind of C5/C6 alkane low-temperature isomerization method
  • A kind of C5/C6 alkane low-temperature isomerization method
  • A kind of C5/C6 alkane low-temperature isomerization method

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Embodiment 1

[0031] A kind of C5 / C6 alkane low-temperature isomerization method, its technical process is as follows figure 1 shown. Using a commercially available low-temperature isomerization catalyst to carry out C5 / C6 alkane isomerization includes the following steps:

[0032] (1) The C5 / C6 raw material 11 (see Table 1 for properties) from the outside first enters the deisopentanizer 1, and the deisopentanizer 1 is provided with a top condenser 2 and a bottom reboiler 3 to remove Water is removed 20 and separated into an isopentane fraction 21 and a deisopentanizer fraction 13 . The isopentane fraction 19 goes to downstream processes. The removed water 20 is sent to the subsequent treatment device, and the top reflux 22 of the de-isopentanizer is refluxed into the de-isopentanizer 1 .

[0033] (2) The deisopentanized fraction 13 enters the deisopentanized fraction drier 5 for drying, and the moisture content of the dried deisopentanized fraction reaches the feeding condition of the ...

Embodiment 2

[0048] A method for isomerizing C5 / C6 alkane at low temperature, adopting the following steps:

[0049] 1) The raw material enters the deisopentanizer to remove moisture and is separated into isopentane fraction and deisopentane fraction, and the volume content of isopentane in the isolated isopentane fraction reaches more than 75%, and the isopentane fraction is removed Downstream process, remove water to follow-up treatment device;

[0050] 2) The deisopentanized fraction is dried in a drier, and the moisture content is controlled to be less than 1ppm;

[0051] 3) The external hydrogen enters the dryer to dry, and the moisture content is controlled to be less than 1ppm;

[0052] 4) The dried de-isopentanized fraction is mixed with hydrogen and then enters the isomerization reactor for isomerization reaction at low temperature. In this example, the reaction temperature is 150°C, and the isomerization reaction adopts Catalyst supported by γ-Al 2 o 3 , metal component Pt an...

Embodiment 3

[0055] 1) The raw material enters the deisopentanizer to remove moisture and is separated into isopentane fraction and deisopentane fraction, and the volume content of isopentane in the isolated isopentane fraction reaches more than 75%, and the isopentane fraction is removed Downstream process, remove water to follow-up treatment device;

[0056] 2) The deisopentanized fraction is dried in a drier, and the moisture content is controlled to be less than 1ppm;

[0057] 3) The external hydrogen enters the dryer to dry, and the moisture content is controlled to be less than 1ppm;

[0058] 4) The dried deisopentanized fraction is mixed with hydrogen and then enters the isomerization reactor to carry out the isomerization reaction at low temperature. In this example, the reaction temperature is 180° C., and the isomerization reaction adopts Catalyst supported by γ-Al 2 o 3 , metal component Pt and halogen Cl, wherein, the mass percentage of metal component Pt is 1.5%, the mass p...

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Abstract

The invention relates to a C5 / C6 alkane low-temperature isomerization method. According to the method, raw materials enter an isopentane-removing tower to remove moisture and separate into an isopentane fraction and an isopentane-removed fraction; the isopentane-removed fraction and hydrogen are dried and then enter an isomerization reactor to carry out an isomerization reaction under the condition of low temperature so as to generate an isomerization reaction product; the isomerization reaction product enters a depentanizer to produce a pentane fraction and an isohexane fraction; the isohexane fraction goes into a downstream process; after heat exchange with materials at the bottom of the isopentane-removing tower, the pentane fraction which is used as a reboiler heat source of the isopentane-removing tower is divided into two paths; after being used as a feedstock of the isopentane-removing tower to remove the isopentane fraction, one path enters the reaction feed process again; and the other path used as top reflux of the depentanizer returns back to the depentanizer again. The method provided by the invention has advantages of low plant investment, low energy consumption, high isomerization rate of products and octane number and the like.

Description

technical field [0001] The invention relates to a light hydrocarbon isomerization technology, in particular to a low-temperature isomerization method for C5 / C6 alkanes. Background technique [0002] In recent years, smog weather has continued to appear in major cities in my country, seriously affecting the health of residents, prompting the Chinese government to speed up the process of upgrading oil products. On December 18, 2013, the National Quality Supervision Bureau and the Standardization Committee issued the National V Motor Gasoline Standard, the transition period is until December 31, 2017, and it will be implemented from January 1, 2018. [0003] With the approach of the transition period, the upgrading of oil product quality has become the primary problem to be solved by my country's refineries. At present, in order to meet the octane number requirements, the proportion of catalytic gasoline and reformed gasoline in gasoline components in my country is relatively ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/27C07C7/04C07C9/16C07C9/18
Inventor 武长江宋汉磊
Owner SHANGHAI HOTO PETROCHEM ENG
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