Method for isomerization of light hydrocarbon

A technology of isomerization and light hydrocarbons, which is applied in the field of isomerization of light hydrocarbons, can solve the problem of octane number limitation of isomerized gasoline products, and achieve the effect of improving single-pass conversion rate, high octane number, and saving consumption

Active Publication Date: 2016-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the retentate fraction also contains more methylpentane, the further improvement of the octane number of the isomerized gasoline product is limited

Method used

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  • Method for isomerization of light hydrocarbon
  • Method for isomerization of light hydrocarbon
  • Method for isomerization of light hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 adopts attached figure 1 In the process scheme shown, the processing scale of the isomerization unit is 300,000 tons / year. The raw material for isomerization is light hydrocarbons that have undergone hydrotreating. In addition to C5 and C6 alkanes, it also contains a small amount of other components. The specific composition data is shown in Table 1. It can be seen from Table 1 that: The molar content of alkanes is 47.94%, of which isopentane accounts for 42.49% of the content of C5 paraffins; the molar content of C6 paraffins is 39.93%, of which dimethylbutane accounts for 7.29% of the content of C6 paraffins. The research octane number of the raw material is 67.5. The composition and properties of the isomerized gasoline product are also listed in Table 1, as can be seen from Table 1: isopentane in the isomerized gasoline product accounts for 95.15% of the C5 paraffin content, and dimethylbutane accounts for The content of C6 paraffins was increased to ...

Embodiment 2

[0038] Embodiment 2 also adopts the attached figure 1 The difference in the process flow scheme shown is that the gas phase stream drawn from the top of the depentanizer adopts a conventional condensation cooling method.

[0039] The isomerization raw material of Example 2 is the same as the raw material of Example 1, the process conditions of the isomerization reaction part of the two are also the same, and the separation precision of the deisopentanizer, depentanizer and deisohexane tower is also the same .

[0040] The operating conditions of the deisopentanizer, depentanizer and deisohexane tower in Example 2 are shown in Table 2, and the heat loads of the reboilers of the three towers are shown in Table 3. Since there is no need to consider the temperature of the gas phase at the top of the depentanizer, the depentanizer can be operated at a lower pressure.

[0041] The total heat load provided by the external heat source for the deisopentanizer, depentanizer and deisoh...

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Abstract

The invention relates to a method for isomerization of light hydrocarbon. According to the method, a light hydrocarbon raw material is introduced into an isopentane removal tower, a material flow at the top of the tower is taken as an isomerization product for eduction, the reaction products are introduced into a pentane removal tower for being separated, a material flow at the top of the pentane removal tower and the light hydrocarbon raw material are mixed and introduced into the isopentane removal tower, a material flow at the bottom of the isopentane removal tower is introduced into an isohexane removal tower, the material flow at the top of the isohexane removal tower is taken as the isomerization product for eduction, methylpentane and hexane extracted from side line of the isohexane removal tower are returned to an isomerization reactor for further conversion; the pentane removal tower is operated under pressurization, and the material flow at the top of the pentane removal tower is taken as a heat source of a reboiler of the isopentane removal tower. The method can fully use heat of condensation of the material flow at the top of the pentane removal tower during a separating process of n-alkanes and iso-paraffin, and the energy consumption of an light hydrocarbon isomerization apparatus is effectively reduced.

Description

technical field [0001] The present invention relates to a kind of isomerization method of light hydrocarbons, more specifically, relate to a kind of straight-chain alkanes with smaller carbon number to generate branched chain isoparaffins through hydrogenation isomerization reaction to improve light hydrocarbons Octane method. Background technique [0002] With the increasing awareness of environmental protection, my country's requirements for vehicle fuels, especially gasoline products, have become more and more stringent, and strict restrictions have been imposed on the content of olefins, aromatics and sulfur in gasoline. The blending components in the gasoline pool in my country include FCC gasoline, catalytically reformed gasoline, isomerized gasoline and alkylated gasoline, among which FCC gasoline is the most important blending component, but FCC gasoline has a relatively high The use of hydrogenation technology to reduce olefins and desulfurize is likely to cause oct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
Inventor 赵志海师峰杨克勇
Owner CHINA PETROLEUM & CHEM CORP
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