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Method for isomerization of light hydrocarbon

A technology of isomerization and light hydrocarbons, applied in the field of isoparaffins, can solve the problems of increased energy consumption of the device, complex equipment and operation, etc., and achieve the effect of increasing the octane number and improving the conversion rate of isomerization

Inactive Publication Date: 2004-08-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the light hydrocarbon isomerization process mentioned in USP4,831,209, C5 and C6 alkane raw materials enter the de-isohexane tower after passing through the isomerization reactor, gas-liquid separator and pre-flash tower, and the separated normal C6 The alkanes are led back to the inlet of the reactor, but in this method, since the returned material is mixed with the raw material and then enters the reactor again to realize circulation in the reaction system, the isoparaffin contained in the raw material will inhibit the isomerization reaction of the normal alkanes, To further increase the conversion rate of n-paraffins, only by increasing the flow rate of the returned material, resulting in an increase in energy consumption of the device
In the light hydrocarbon isomerization process mentioned in USP5,233,120 and USP5,602,291, the isomerization reaction product is carried out selective adsorption separation, and the n-alkanes in it are returned to the inlet of the reactor, and the n-alkanes can almost reach With full conversion, the octane number of light hydrocarbon raw materials is greatly improved, but the equipment and operation of the adsorption process are relatively complicated

Method used

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  • Method for isomerization of light hydrocarbon

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Effect test

Embodiment 1

[0031] This embodiment adopts the process flow shown in the accompanying drawings, and the following is an explanation from several aspects such as the composition and properties of light hydrocarbon raw materials, the main reaction conditions of isomerization, and the composition and properties of isomerization products:

[0032] 1. Composition and properties of light hydrocarbon feedstock

[0033] The weight composition of light hydrocarbon feedstock is as follows:

[0034] n-butane, wt% 2.60

[0035] Isobutane, wt% 0.30

[0036] n-Pentane, wt% 23.54

[0037] Isopentane, wt% 9.56

[0038] Cyclopentane, wt% 1.39

[0039] n-Hexane, wt% 32.66

[0040] Isohexane, wt% 22.13

[0041] Cyclohexane and methylcyclopentane, wt% 4.15

[0042] Benzene, wt% 1.65

[0043] C7 and above hydrocarbons, wt% 2.03

[0044] If the light hydrocarbon raw material is removed by the gasoline stabilization tower, the research octane number should be 59.4, and its octane number is very low. Du...

Embodiment 2

[0070] The process used in this embodiment is basically the same as the process shown in the accompanying drawings, except that the liquid phase of the rear gas-liquid separator is used as the isomerization product and sent to the gasoline stabilization system, and the return liquid phase stream is cancelled. The composition and properties of light hydrocarbon raw materials, the main reaction conditions of isomerization and the composition and properties of isomerization products are explained below:

[0071] 1. Composition and properties of light hydrocarbon feedstock

[0072] The light hydrocarbon raw material used in this embodiment is the same as the light hydrocarbon raw material used in Example 1.

[0073] 2. The main reaction conditions of isomerization

[0074] The inlet temperature of the front reactor, ℃ 250

[0075] Inlet pressure of front reactor, MPa 1.95

[0076] Weight hourly space velocity of the feed in the front reactor, h -1 1.0

[0077] The molar rat...

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Abstract

The light hydrocarbon isomerizing process includes the isomerizing reaction of light hydrocarbon material in the front isomerizing reactor, gas-liquid separation of the effluent from the front isomerizing reactor, separating the liquid phase flow in isomerized alkane eliminating tower to obtain the top matter flow with isomerized alkane as main component as the isomerized product and fed to gasoline stabilizing system and the bottom matter flow with normal alkane as main component, the isomerizing reaction of the normal alkane in the back isomerizing reactor, gas-liquid separation of the effluent from the back isomerizing reactor, and feeding partial liquid phase flow as the isomerized product to the gasoline stabilizing system while returning the other liquid phase flow as the charge for the isomerized alkane eliminating tower. The said process has raised isomerizing conversion rate and greatly raised octane number of light hydrocarbon material.

Description

technical field [0001] The invention relates to a method for preparing hydrocarbons from hydrocarbons containing the same number of carbon atoms, more specifically, a method of isomerizing straight-chain alkanes with smaller carbon atoms to generate branched isoparaffins, A method to increase the octane number of light hydrocarbon raw materials. Background technique [0002] During primary and secondary processing of crude oil, light hydrocarbon fractions mainly composed of C5 and C6 will be produced, which can be used as blending components of gasoline, raw materials for ethylene cracking or raw materials for hydrogen production by steam reforming of light hydrocarbons Among them, as a blending component of gasoline, it brings the greatest economic benefits to enterprises, but due to the low octane number of n-alkanes in light hydrocarbons, its blending quantity in gasoline is limited. If the n-alkanes in light hydrocarbons are converted into is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G35/00
Inventor 金欣杨克勇赵志海师峰付锦晖张秋平濮仲英
Owner CHINA PETROLEUM & CHEM CORP
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