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Optimized utilization method for light naphtha

A technology of light naphtha and light removal tower, applied in chemical instruments and methods, organic chemistry, hydrocarbons and other directions, to achieve the effect of improving utilization rate, low energy consumption, high product purity and yield

Inactive Publication Date: 2017-01-11
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reported literature, most of them are methods for optimizing the utilization of whole-fraction naphtha, and there is no use of light naphtha as raw material to simultaneously produce high-quality ethylene cracking material and high-octane gasoline blending material by adopting an adsorption-rectification coupling process and reports of high-purity isopentane

Method used

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  • Optimized utilization method for light naphtha

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Light naphtha with a normal paraffin content of 25% enters the vaporizer H1 and is vaporized at 150°C and 0.7MPa. The n-alkanes in the naphtha are adsorbed by mordenite, and the residual oil flows out from the outlet of the adsorption tower, wherein the n-alkanes content is 0.3%;

[0030] After the adsorption process is over, use nitrogen for intermediate replacement under the conditions of 150°C and 0.2MPa to purge out the materials in the dead space of the bed for 5 minutes;

[0031] After the intermediate replacement process is completed, desorption is carried out by combining vacuum pumping and nitrogen purging. Under the conditions of 150°C and 0.05MPa, the normal alkanes adsorbed in the mordenite are desorbed for 25 minutes, and the normal alkanes in the desorbed oil The alkane content is 99.5%, and the ethylene yield is 41.8% when used as ethylene cracking material.

[0032] The suction residue oil of above-mentioned adsorption separation unit enters deweighting...

Embodiment 2

[0034] Light naphtha with a normal paraffin content of 25% enters the vaporizer H1 and is vaporized at 80°C and 0.15MPa. The n-alkanes in the naphtha are adsorbed by mordenite, and the residual oil flows out from the outlet of the adsorption tower, wherein the n-alkanes content is 0.25%;

[0035] After the adsorption process, at 80°C, reduce the pressure in the bed to 0.1MPa, and discharge the material in the dead space by reducing the bed pressure for 5 minutes;

[0036] After the intermediate replacement process, the bed is evacuated to 0.1×10 -3 MPa, at 80°C, 0.1×10 -3 Carry out vacuum desorption under the condition of MPa, desorb the n-alkanes adsorbed in the mordenite for 25 minutes, the content of n-alkanes in the desorbed oil is 99.3%, and the yield of ethylene when used as ethylene cracking material is 41.7%.

[0037] The suction residue oil of above-mentioned adsorption separation unit enters deweighting D1, and plate number is 40, and feed plate is the 40th, and re...

Embodiment 3

[0039] The light naphtha with a n-paraffin content of 35% enters the vaporizer H1 and is vaporized at 350°C and 9.5MPa. After 10 minutes of adsorption, the n-alkanes in the light naphtha were adsorbed by the SAPO-17 aluminum phosphate molecular sieve, and the residual oil flowed out from the outlet of the adsorption tower, wherein the n-alkanes content was 0.15%;

[0040] After the adsorption process is over, nitrogen is used for intermediate replacement under the conditions of 350°C and 2MPa, and the material in the dead space of the bed is purged out for 2 minutes;

[0041] After the intermediate replacement process is completed, desorption is carried out by combining vacuum pumping and water vapor purging. Purging and desorption is carried out under the conditions of 350 ° C and 0.08 MPa to desorb the n-alkanes adsorbed in the mordenite. The time is 8 minutes. The content of n-alkanes in the attached oil is 99.1%, and the ethylene yield is 41.6% when used as ethylene cracki...

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Abstract

The invention discloses an optimized utilization method for light naphtha. According to the method, firstly, the light naphtha passes through an adsorptive separation unit, adsorbed remaining oil rich in iso-alkanes and desorbed oil rich in n-alkanes can be obtained separately, and the desorbed oil can directly serve as an ethylene cracking stock; and the adsorbed remaining oil then passes through a rectifying unit, and a gasoline mixture rich in iso-C6 and high-purity isopentane can be obtained separately. According to the optimized utilization method for the light naphtha, an adsorptive separation-rectifying separation coupled process is adopted, the adsorptive separation unit uses a high-performance adsorbent, and the adsorbent can be used for achieving the distinct partition of the n-alkanes and the iso-alkanes according to molecular dimension difference, so that the selectivity is high, and the regeneration effect is good; and compared with the traditional multi-tower precise rectification, the method has the advantages that the energy consumption is low, and both the product purity and the product yield are relatively high.

Description

technical field [0001] The invention relates to a method for optimizing the utilization of light naphtha. Background technique [0002] Light naphtha refers to the light components with a distillation range of 30-60°C produced during crude oil processing, mainly from the atmospheric and vacuum, coking, and hydrocracking and reforming processes of the refinery unit and aromatics unit. The content of isoparaffins in light naphtha is 55%-65% (wt). When directly used as ethylene cracking material, the ethylene yield is low and the cracking performance is poor; , will limit its proportion as a gasoline blending material due to its high vapor pressure. At present, the utilization of light naphtha is still mainly used as the above-mentioned ethylene cracking material and gasoline blending material. In addition, there are also literatures that use multi-tower rectification process to produce high-purity solvent oil and gasoline blending components and other products to improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/08C07C7/00C07C7/04C07C7/12C07C9/18
Inventor 刘宗健崔群汪洋陈韶辉王海燕李晓强殷飞
Owner SINOPEC YANGZI PETROCHEM
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