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Low-temperature isomerization method for low-carbon normal alkanes

A low-temperature isomerization and normal paraffin technology, which is applied in the fields of isomerization to hydrocarbon production, chemical instruments and methods, organic chemistry, etc. problems, to achieve the effect of a large increase in octane number, a high isomerization rate, and a simple preparation process

Active Publication Date: 2015-09-09
NINGBO ZHONGXUN ENVIRONMENTAL TECH CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for isomerizing low-carbon normal alkanes at low temperature, which solves the problems of high energy consumption, low isomerization rate, high reaction temperature, and low activity of the chemical agent in the existing isomerization reaction.

Method used

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  • Low-temperature isomerization method for low-carbon normal alkanes
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  • Low-temperature isomerization method for low-carbon normal alkanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 Shown, a kind of method of low-carbon n-paraffin low-temperature isomerization, comprises the following steps:

[0035] (1) The light hydrocarbon raw material mainly containing normal C5 and normal C6 is exchanged with the product at the bottom of the isomerization reactor through the feed pump, and the light hydrocarbon raw material after heat exchange is mixed with the cold low fraction bottom material and then enters C5 rectification tower, isomerized C5 is obtained from the top of the C5 rectification tower, normal C5 is obtained from the middle of the C5 rectification tower, heavy hydrocarbons are obtained from the bottom of the C5 rectification tower, and the heavy hydrocarbons enter the C6 rectification tower;

[0036](2) Obtain isomerized C6 from the top of the C6 rectification tower, heavy hydrocarbons are obtained from the bottom of the C6 rectification tower, normal C5 is obtained from the middle of the C5 rectification tower, and heavy hydro...

Embodiment 2

[0043] Basically the same as Example 1, the difference is:

[0044] The chlorine supplement system uses aluminum trichloride as the chlorination agent, the chlorine supplement amount is 8w% of the catalyst, the chlorine supplement condition is a temperature of 650°C, and the chlorine supplement time is 4 hours;

[0045] The reaction conditions of the isomerization reaction are isomerization reaction temperature 170°C, reaction pressure 2.0MPa, hydrogen-oil ratio 300:1, fresh raw material space velocity 0.5h -1 , the catalyst is a high-activity supported dual-function catalyst including a metal active component and a carrier, the metal active component is Pt and Pd, the Pt loading is 0.5w% of the catalyst, the Pd loading is 0w% of the catalyst, and the carrier is γ- al 2 o 3 .

[0046] The light hydrocarbon raw material used in this example is reformed top oil, and the products after isomerization are shown in the table below.

[0047] project

[0048] ...

Embodiment 3

[0050] Basically the same as Example 1, the difference is:

[0051] The chlorine supplement system uses aluminum trichloride as the chlorination agent, the chlorine supplement amount is 5w% of the catalyst, the chlorine supplement conditions are at a temperature of 550°C, and the chlorine supplement time is 2 hours;

[0052] The reaction conditions of the isomerization reaction are isomerization reaction temperature 120°C, reaction pressure 5.0MPa, hydrogen oil ratio 1200:1, fresh raw material space velocity 1.5h -1 , the catalyst is a high-activity supported dual-function catalyst including metal active components and supports, the metal active components are Pt and Pd, the Pt loading is 0.3w% of the catalyst, the Pd loading is 0.2w% of the catalyst, and the support is γ -Al 2 o 3 .

[0053] The light hydrocarbon raw material used in this example is a mixed raw material with a mass ratio of n-C5 and n-C6 of 3:1, and the products after isomerization are shown in the table b...

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Abstract

The invention relates to a low-temperature isomerization method for low-carbon normal alkanes, wherein the low-temperature isomerization method includes the following steps: (1) carrying out heat exchange of a light hydrocarbon raw material containing normal C5 and normal C6 as principal components with an isomerization product, and after heat exchange, rectifying to obtain heterogeneous C5, normal C5 and a heavy hydrocarbon; (2) rectifying the heavy hydrocarbon again, to obtain heterogeneous C6 and a heavy hydrocarbon, mixing the normal C5 with the heavy hydrocarbon, and then supplementing chlorine; (3) carrying out drying dehydration on the material obtained after chlorine supplement, mixing with dried fresh hydrogen and circulating hydrogen, heating, and carrying out an isomerization reaction under the action of a catalyst after heating; and (4) after carrying out heat exchange of the isomerization product with a fresh raw material, carrying out first gas-liquid separation, wherein the obtained non-condensable gas is circulating hydrogen; and carrying out gas-liquid separation on the obtained liquid again, mixing the obtained liquid with a fresh raw material, and then rectifying. The yield of the liquid product obtained by the low-temperature isomerization method is more than 98%, the isomerization rate is 60%-90%, and the octane value can be increased by 10-30.

Description

technical field [0001] The invention relates to a method for isomerizing low-carbon normal alkanes at low temperature, and belongs to the field of high value-added products in petroleum processing technology. Background technique [0002] During the primary and secondary processing of crude oil, light hydrocarbon fractions mainly composed of C5 and C6 will be produced. The fractions can be used as gasoline blending components, ethylene cracking raw materials or light hydrocarbon steam reforming raw materials for hydrogen production. Because it does not contain olefins and aromatics, it is a better gasoline blending component, but the octane number of the light hydrocarbons is low, and the blending ratio in gasoline is limited. Light hydrocarbon isomerization technology is to convert normal paraffins in light hydrocarbons into iso, increase the octane number of light hydrocarbons, and increase the blending ratio of light hydrocarbons in gasoline, which is beneficial to the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/27C07C9/16C07C9/18B01J23/44
Inventor 邓文安李传李庶峰文萍杜峰高贝贝王兴旺
Owner NINGBO ZHONGXUN ENVIRONMENTAL TECH CO LLC
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