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A method of extracting isopentane from naphtha

A naphtha, isopentane technology, applied in chemical instruments and methods, hydrocarbon purification/separation, adsorption purification/separation, etc., can solve the problem of high energy consumption, achieve lower energy consumption, flexible control, and large operation flexibility Effect

Active Publication Date: 2018-03-02
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of high energy consumption in the prior art, and a new method for extracting isopentane from naphtha is provided

Method used

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  • A method of extracting isopentane from naphtha
  • A method of extracting isopentane from naphtha
  • A method of extracting isopentane from naphtha

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] as per figure 1 The shown method extracts isopentane from naphtha, and the composition of the feedstock is shown in Table 1.

[0023] Table 1

[0024] Raw material composition

[0025] The vaporized naphtha raw material enters the adsorption tower, and there are two adsorption towers, which are used alternately for adsorption and desorption, and operate continuously. The adsorbent is 5A molecular sieve, and the desorbent is nitrogen. The adsorption pressure is 1.0MPa in gauge pressure, and the adsorption temperature is 200°C. After determination, the composition of the material at the top outlet of the adsorption tower is shown in Table 2.

[0026] Table 2

[0027]

[0028]

[0029] The top material of the adsorption tower enters the reboiler of the weight removal tower to heat the material in the tower kettle, and the outlet temperature is 124°C, and then cools to about 80°C in the feed cooler of the weight removal tower and enters the middle of the...

Embodiment 2

[0034] According to the method and steps of Example 1, the vaporized naphtha raw material enters the adsorption tower, and there are two adsorption towers, and the adsorption and desorption are alternately used and operated continuously. The adsorbent is 5A molecular sieve, and the desorbent is H 2 . The adsorption pressure is 0.5MPa in gauge pressure, and the adsorption temperature is 150°C. After determination, the composition of the material at the top outlet of the adsorption tower is shown in Table 4.

[0035] Table 4

[0036]

[0037]

[0038] The top material of the adsorption tower enters the reboiler of the deweighting tower to heat the material in the tower kettle, the outlet temperature is 95°C, and then cools to about 60°C in the feed cooler of the deweighting tower and enters the middle of the deweighting tower. The weight-removing column has 50 trays, the operating pressure is 0.1MPa in gauge pressure, the temperature at the top of the tower is 38.2°C, t...

Embodiment 3

[0043] According to the method and steps of Example 1, the vaporized naphtha raw material enters the adsorption tower, and there are two adsorption towers, and the adsorption and desorption are alternately used and operated continuously. The adsorbent is 5A molecular sieve, and the desorbent is CO 2 . The adsorption pressure is 1.5MPa in gauge pressure, and the adsorption temperature is 250°C. After determination, the composition of the material at the top outlet of the adsorption tower is shown in Table 6.

[0044] Table 6

[0045]

[0046]

[0047]The top material of the adsorption tower enters the reboiler of the deweighting tower to heat the material in the tower kettle, the outlet temperature is 120°C, and then cools to about 80°C in the feed cooler of the deweighting tower and enters the middle of the deweighting tower. The weight removal tower has 88 trays, the operating pressure is 0.3MPa in gauge pressure, the temperature at the top of the tower is 63.9°C, th...

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Abstract

The invention relates to a method of extracting isopentane from naphtha, mainly overcoming a problem that energy consumption is high in the prior art. The problem is solved well by adopting the method, and the method includes (1) feeding a naphtha raw material into adsorption columns, and adsorbing n-alkanes by an adsorbent, with an isoparaffin product stream being obtained from the column tops; (2) after adsorption is finished, adding a desorption agent into the adsorption column to replace the n-alkanes; (3) heating a column bottom material by adopting the isoparaffin product stream obtainedfrom the column tops of the adsorption columns as a heat source of a de-heavy column reboiler, cooling the stream by a de-heavy column feeding cooler, and then feeding the stream into a de-heavy column, with C3-C5 isoparaffin being obtained from the column top and C6-C8 isoparaffin being obtained from the column bottom; and (4) feeding C3-C5 isoparaffin obtained from the column top of the de-heavy column into a light component removing column, with a high-purity isopentane product being obtained from the column bottom. The method can be used for processes extracting the isopentane from the naphtha.

Description

technical field [0001] The invention relates to a method for extracting isopentane from naphtha. Background technique [0002] In the petroleum and petrochemical industry, a large number of light hydrocarbon by-products are produced, including reforming top oil, hydrocracking tail oil, etc. The fraction contained in these naphthas is saturated C3-C8. For a long time, light naphtha has been mainly used as raw material for ethylene cracking or gasoline blending material, and its potential added value has not been reflected. With the development and progress of technology, the deep processing of these by-products to obtain a series of products has been reflected. Isopentane is one of the petrochemical products with high added value, which is the raw material and solvent of organic synthesis. Isopentane can be deoxygenated to produce isopentene and isoprene, and isoamyl alcohol can be produced by chlorination and hydrolysis. It is a blending agent for increasing the octane nu...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C7/13C07C9/18
CPCC07C7/005C07C7/04C07C7/13C07C9/18
Inventor 唐绮颖堵祖荫杨兆银丁智翔
Owner SINOPEC SHANGHAI ENG
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