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Technique for extracting high-pure normal hexane product by pressure swing adsorption

A pressure swing adsorption, n-hexane technology, applied in adsorption purification/separation, organic chemistry and other directions, can solve the problems of low yield, high energy consumption of rectification, complex process, etc., and achieve simple equipment, simple process and convenient operation. Effect

Active Publication Date: 2008-03-26
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It avoids the problems of high energy consumption, low yield and complicated process in the rectification method

Method used

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  • Technique for extracting high-pure normal hexane product by pressure swing adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Industrial hexane is used as raw material, SAPO-34 molecular sieve is used as adsorbent, the typical composition of industrial hexane is shown in Table 1, and the schematic diagram of the four-tower pressure swing adsorption process is shown in Figure 1.

[0018] Table 1 Composition of industrial hexane

[0019] Compound name

Content (wt%)

2,3-Dimethylbutane

2-Methylpentane

0.56

4.08

[0020] 3-Methylpentane

n-Hexane

2,2-Dimethylpentane

Methylcyclopentane

2,4-Dimethylpentane

2,2,3-Trimethylbutane

Cyclohexane

20.49

62.10

0.58

11.85

0.16

0.01

0.20

[0021] The four-tower (T1, T2, T3, T4) pressure swing adsorption cycle process and time distribution are shown in Table 2. A pressure swing adsorption cycle period is 16 minutes, of which the adsorption is 4 minutes, the average pressure drop is 2 minutes, the pressure i...

Embodiment 2

[0026] Embodiment 2, as shown in Figure 2. The pressure swing adsorption process, specific operation process and steps are the same as in Example 1, the difference is that the adsorption temperature is 120°C, and the desorption adopts vacuuming while using N 2 Purging, desorption pressure is 50kPa.

Embodiment 3

[0027] In Example 3, No. 6 solvent oil was used as the raw material, and 5A molecular sieve was used as the adsorbent. The composition of No. 6 solvent oil is shown in Table 3, and the schematic diagram of the seven-tower pressure swing adsorption process is shown in Fig. 3 .

[0028] Table 3 Composition of No. 6 solvent oil

[0029] Compound name

Content (wt%)

2,2-Dimethylbutane

2,3-Dimethylbutane

2-Methylpentane

3-Methylpentane

n-Hexane

2,2-Dimethylpentane

Methylcyclopentane

2,4-Dimethylpentane

2,2,3-Trimethylbutane

3,3-Dimethylpentane

Cyclohexane

2-Methylhexane

2,3-Dimethylpentane

3-Methylhexane

1.43

6.27

27.51

21.71

25.26

2.57

3.73

2.64

0.42

1.51

0.84

2.75

1.26

2.01

[0030] The seven towers (T1, T2, T3, T4, T5, T6, T7) pressure swing adsorption cycle process and time distribution are shown in Table 4. A pressure ...

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Abstract

The present invention relates to chemical separation technology, and is especially the pressure swing adsorption process of extracting high purity n-hexane product. The multiple-tower heated pressure swing adsorption process includes the following steps: adsorbing, homogenizing pressure fall and discharging pressure, desorbing, and homogenizing pressure rise and raising pressure. The advanced technological process has simple apparatus, convenient operation, low power consumption, high automation, high marketability and other features.

Description

Technical field: [0001] The invention relates to a chemical separation method, in particular to a process method for extracting high-purity n-hexane products by pressure swing adsorption. Background technique: [0002] n-Hexane is one of the most widely used hydrocarbon solvents in industry today, and it is also the most representative non-polar solvent. It can dissolve various hydrocarbons and halogenated hydrocarbons. Insecticides, rubber, cosmetics, spices, chemical polymerization, medicine, and cleaning of electronic components are widely used. At present, the industry mainly obtains industrial-grade hexane products with a purity of 60-80% (wt) from platinum reforming raffinate by rectification and separation. due to C 6 The fractions have very similar boiling points (such as n-hexane at 69°C and methylcyclopentane at 71.8°C), so it is difficult to separate them by ordinary rectification. Precision rectification has high energy consumption, high production cost, low yi...

Claims

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Application Information

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IPC IPC(8): C07C9/14C07C7/12
Inventor 姚小利崔群周立进刘宗健李晓强杜旭东堵文斌姚虎卿柏基业
Owner SINOPEC YANGZI PETROCHEM
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