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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 increasing octane number

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
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Embodiment 1

[0031] In this embodiment, the attached figure 1 In the process scheme shown, the processing scale of the isomerization unit is 300,000 tons / year. The light hydrocarbon raw material is the light hydrocarbon through hydrotreating, besides C5 and C6 alkanes, it also contains a small amount of other components, its specific composition data is shown in Table 1, it can be seen from Table 1: the C5 alkanes in the raw material The molar content is 59.02%, wherein isopentane accounts for 44.92% of the C5 paraffin content. The research octane number of the raw material was 72.4. The composition and properties of the isomerized gasoline product are also listed in Table 1, as can be seen from Table 1: the isopentane in the isomerized gasoline product accounts for 87.58% of the C5 paraffin content, and the research method octane number of the product increases to 85.5.

[0032] Table 2 lists the operating conditions of the depentanizer and the depentanizer. The pressure at the top of...

Embodiment 2

[0035] Example 2 adopts the process scheme in Example 1, except that the gas phase stream drawn from the top of the depentanizer adopts a conventional condensation cooling method.

[0036] The light hydrocarbon raw material of Example 2 is the same as that of Example 1, the process conditions of the isomerization reaction part of the two are also the same, and the separation precision of the de-isopentanizer and the depentanizer is also the same.

[0037] The operating conditions of the de-isopentanizer and the depentanizer in Example 2 are shown in Table 2, and the heat loads of the reboilers of the two towers are shown in Table 3.

[0038] In this embodiment, the total heat load provided by the external heat source for the deisopentanizer and the depentanizer is 16900 kW, which is 61.72% higher than the total heat load provided by the external heat source in Example 1 of 10450 kW.

[0039] Table 1

[0040]

Light hydrocarbon feedstock

Isomerized gasoline ...

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Abstract

The invention relates to a method for isomerization of light hydrocarbon. According to the invention, a light hydrocarbon raw material which takes C5 and C6 alkanes as main components is introduced into an isopentane removal tower, a material flow at the top of the isopentane removal tower is taken as the isomerization product for eduction, a material flow at the bottom of the isopentane removal tower is introduced into an isomerization reaction unit, under existence of hydrogen, the material flow at the bottom is contacted with an isomerization catalyst in an isomerization reactor for an isomerization reaction, 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 pentane removal tower is taken as the isomerization product for eduction, the pressure at the top of the pentane removal tower is 0.80-1.20 MPa, 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, are becoming 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 oc...

Claims

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Application Information

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IPC IPC(8): C10G67/00
Inventor 师峰赵志海杨克勇
Owner CHINA PETROLEUM & CHEM CORP
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