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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 increasing coking tendency, reducing the isomerization rate of C5 hydrocarbons, and reducing the isomerization rate, so as to reduce heating and cooling energy consumption. , the effect of increasing the octane number of the product and increasing the isomerization rate

Active Publication Date: 2015-09-30
SHANGHAI HOTO PETROCHEM ENG
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  • 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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  • C5/C6 alkane low-temperature isomerization method
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  • C5/C6 alkane low-temperature isomerization method

Examples

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Embodiment 1

[0031] A C5 / C6 alkane low-temperature isomerization method, the process flow is as follows figure 1 Shown. Using a commercially available low-temperature isomerization catalyst to perform C5 / C6 alkane isomerization includes the following steps:

[0032] (1) The C5 / C6 raw material 11 from outside (see Table 1 for properties) first enters the isopentane tower 1, which is equipped with a top condenser 2 and a bottom reboiler 3. Water 20 is removed and separated into isopentane fraction 21 and deisopentane fraction 13. The isopentane fraction 19 goes to the downstream process. The removed water 20 goes to the subsequent treatment device, and the reflux 22 from the top of the isopentane tower is returned to the isopentane tower 1.

[0033] (2) The deisopentane fraction 13 enters the deisopentane fraction dryer 5 for drying, and the moisture content of the dried deisopentane fraction reaches the feed condition of the isomerization reactor 7.

[0034] (3) The hydrogen 12 from outside th...

Embodiment 2

[0048] A C5 / C6 alkane low-temperature isomerization method adopts the following steps:

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

[0050] 2) The deisopentane fraction is dried by a dryer to control the moisture content 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) After the dried deisopentane fraction is mixed with hydrogen, it enters the isomerization reactor, where the isomerization reaction is carried out under low temperature conditions. In this example, the reaction temperature is 150°C. The catalyst is supported by γ-Al 2 O 3 , The metal component Pt and halogen Cl, wherein the mass perc...

Embodiment 3

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

[0056] 2) The deisopentane fraction is dried by a dryer to control the moisture content 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) After the dried deisopentane fraction is mixed with hydrogen, it enters the isomerization reactor, where the isomerization reaction is carried out under low temperature conditions. In this example, the reaction temperature is 180°C. The catalyst is supported by γ-Al 2 O 3 , The metal component Pt and halogen Cl composition, wherein the mass percentage of the metal component Pt is 1.5%, the mass percentage of the halogen...

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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 C5 / C6 alkanes low-temperature isomerization method. Background technique [0002] In recent years, the continuous occurrence of haze weather in major cities in my country has seriously affected the health of residents, prompting the Chinese government to accelerate the process of upgrading oil products. On December 18, 2013, the National Quality Supervision Bureau and the Standardization Committee issued the National V automotive gasoline standard. The transition period will be December 31, 2017, and the implementation will begin on January 1, 2018. [0003] As the transitional period approaches, the upgrading of oil quality has become the primary problem to be solved by my country's refineries. At present, in order to meet the octane requirements, the proportion of catalytic gasoline and reformed gasoline in gasoline components in my country is relatively high, resulti...

Claims

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Application Information

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Patent Type & Authority Applications(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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