Process for extracting n-heptane for combined production of octane product by pressure swing adsorption

A pressure swing adsorption, n-heptane technology, applied in adsorption purification/separation, organic chemistry, distillation purification/separation, etc. High-purity n-heptane, few reports on production processes, etc., to achieve the effect of improving resource utilization efficiency, good economic value and social benefits, and extremely market competitiveness

Inactive Publication Date: 2009-12-30
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, rectification is mainly used in industry to produce n-heptane, because n-heptane and C 7 The boiling points of the fractions are very similar (for example: the boiling point of n-heptane is 98.43°C, the boiling point of methylcyclohexane is 100.93°C, and the boiling point difference is only 2.5°C), it is difficult to separate them by ordinary rectification; the energy consumption is high and the production cost is high by precision rectification. Higher, lower yield, and it is difficult to obtain high-purity n-heptane (>99%); with special distillation method, the cost is higher and the process is complicated
Although the adsorption method has been industrialized in the normal isomerization separation of hydrocarbon mixtures, the improvement of gasoline octane number and the optimization of ethylene raw materials, etc., the use of adsorption methods to remove complex hydrocarbon mixtures such as petroleum fractions, reforming raffinate and solvent oils has been industrialized. There are few reports on the production process of extracting single-component alkane products, and there are no reports on the production process of extracting n-heptane and co-producing n-octane products by pressure swing adsorption

Method used

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  • Process for extracting n-heptane for combined production of octane product by pressure swing adsorption
  • Process for extracting n-heptane for combined production of octane product by pressure swing adsorption
  • Process for extracting n-heptane for combined production of octane product by pressure swing adsorption

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Adopt No. 120 solvent oil as raw material, SAPO-34 molecular sieve is adsorbent, the typical composition of No. 120 solvent oil is shown in Table 1, and the schematic diagram of four-tower pressure swing adsorption process is as follows figure 1 shown.

[0019] Table No. 1120 solvent oil composition

[0020]

[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 is released for 2 minutes, and the desorption is 4 minutes. The pressure is raised for 2 minutes, and the pressure is charged for 2 minutes.

[0022] Table 2 Four-tower pressure swing adsorption cycle process and time distribution

[0023]

[0024]

[0025] [Note]: A-adsorption, ED-pressure drop, CD-decompression, V-desorption, ER-pressure rise, R-charge.

[0026] Schematic...

Embodiment 2

[0027] Example 2, such as figure 2 shown. 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 160°C, and the desorption adopts vacuuming while using N 2 Purging, desorption pressure is 40kPa.

Embodiment 3

[0028] Embodiment 3, using reformed raffinate as raw material, 5A molecular sieve as adsorbent, the composition of reformed raffinate is shown in Table 3, and the schematic diagram of the seven-tower pressure swing adsorption process is as follows image 3 shown.

[0029] Table 3 Composition of reformed raffinate

[0030]

[0031] The seven towers (T1, T2, T3, T4, T5, T6, T7) pressure swing adsorption cycle process and time distribution are shown in Table 4. One pressure swing adsorption cycle is 21 minutes, of which the adsorption is 6 minutes, and the first and third are both 2min, release pressure for 2min, and desorb for 3min.

[0032] Table 4 Seven-tower pressure swing adsorption cycle process and time distribution

[0033]

[0034] [Note]: A-adsorption, ED1-one average pressure drop, ED2-two average pressure drop, ED3-three average pressure drop, CD-depressurization, V-desorption, ER1-average pressure rise, ER2-two average pressure rise , ER3-three equal pressur...

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Abstract

The present invention relates to chemical separation process, and is especially one pressure swing adsorption process for extracting n-heptane and co-produced n-octane. N-heptane and co-produced n-octane are extracted through one combined multiple tower heating pressure swing adsorption and rectifying separation process. The advanced technological process is simple, low in power consumption and high in automation, and can produce high purity n-heptane while producing high purity n-octane.

Description

Technical field: [0001] The invention relates to a chemical separation method, in particular to a process method for extracting n-heptane and co-producing n-octane by pressure swing adsorption. Background technique: [0002] N-heptane is a typical non-polar solvent. It is often used as a standard for determining octane number, an anesthetic, and a raw material for organic synthesis. It is also widely used in industries such as medicine, pesticide, rubber synthesis, chemical fiber synthesis, reagents, and electronic cleaning. N-octane is used as a solvent and as a standard substance for chromatographic analysis, and also for organic synthesis. With the rapid development of chemical industry, medicine, electronics and other related industries, my country's demand for n-heptane will increase year by year, especially high-purity n-heptane has a broad market prospect. N-heptane mainly exists in 90-100°C petroleum distillate, reformed raffinate and No. 120 solvent oil. At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/12C07C9/14C07C7/04
Inventor 崔群刘宗健杜旭东姚虎卿王海燕
Owner NANJING TECH UNIV
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