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Production method for high-purity n-heptane

A production method and technology for n-heptane, which are applied in the production field of high-purity n-heptane, can solve problems such as inability to obtain high-purity n-heptane, and achieve the effects of low equipment requirements, stable product quality and high product purity.

Inactive Publication Date: 2015-11-25
SINOPEC GUANGZHOU ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology cannot obtain high-purity n-heptane above 98%

Method used

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  • Production method for high-purity n-heptane
  • Production method for high-purity n-heptane
  • Production method for high-purity n-heptane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The crude heptane obtained by reforming raffinate through hydrogenation to remove impurities and separation is used as the raw material. The composition of the raw material is shown in Table 1. After passing through the deisoheptanizer 1, rectification and separation are carried out. The theoretical plate number of the deisoheptanizer 1 is 100, operating pressure (gauge) 0.05MPa, tower top temperature 105°C, tower bottom temperature 127°C, the top product of de-isoheptanizer 1 is light components, and the bottom product of de-isoheptanizer 1 is de-light crude normal Heptane, the composition is shown in Table 2

[0027] The light and crude n-heptane enters the middle and lower part of the extractive distillation tower 2, and the circulating solvent (NMF+EG) enters the upper part of the extractive distillation tower 2 for extractive distillation operation, and the gas phase at the top of the tower enters the bottom of the n-heptane re-distillation tower The product obtain...

Embodiment 2

[0043] The crude heptane obtained by reforming raffinate through hydrogenation to remove impurities and separated is used as raw material. The composition of the raw material is shown in Table 1. After passing through the de-isoheptanizer 1, rectification and separation are carried out. The top product of the de-isoheptanizer 1 is For light components, the bottom product of de-isoheptanizer 1 is de-light crude n-heptane, and its composition is shown in Table 2.

[0044] The number of theoretical plates of the deisoheptanizer 1 is 100, the operating pressure (gauge) is 0.09 MPa, the temperature at the top of the tower is 113° C., and the temperature at the bottom of the tower is 135° C.

[0045] The light and crude n-heptane enters the middle and lower part of the extractive distillation tower 2, and the circulating solvent (NMF+EG) enters the upper part of the extractive distillation tower 2 for extractive distillation operation, and the gas phase at the top of the tower enters...

Embodiment 3

[0061] The crude heptane obtained from the reformed raffinate after hydrogenation to remove impurities and separation is used as the raw material. The composition of the raw material is shown in Table 1. Through the de-isoheptanizer 1, rectification and separation are carried out. The top product of the de-isoheptanizer 1 is light components, and the bottom product of the de-isoheptanizer 1 is de-light and crude n-heptane. The composition is shown in Table 2.

[0062] The theoretical plate number of the deisoheptanizer 1 is 96, the operating pressure (gauge) is 0.05 MPa, the temperature at the top of the tower is 105° C., and the temperature at the bottom of the tower is 127° C.

[0063] The light and crude n-heptane enters the middle and lower part of the extractive distillation tower 2, and the circulating solvent (NMF+EG) enters the upper part of the extractive distillation tower 2 for extractive distillation operation, and the gas phase at the top of the tower enters the bo...

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PUM

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Abstract

The invention discloses a production method for high-purity n-heptane. According to the method, a raw material (5) is rectified and separated in an isoheptane removal tower (1); light component-removed crude n-heptane at the bottom of the isoheptane removal tower (1) enters an extracting and rectifying tower (2) and has countercurrent contact with a compound circulation solvent (10) so as to realize extraction and rectification; a top material flow of the extracting and rectifying tower (2) enters an n-heptane re-evaporation tower (4) for rectification; a tower top material flow of the n-heptane re-evaporation tower (4) flows into a return tank (15), a part of the tower top material flow returns to the n-heptane re-evaporation tower (4), and the other part of the tower top material flow is discharged as a product (16); a bottom material flow of the n-heptane re-evaporation tower (4) flows into the extracting and rectifying tower (2); a bottom material flow of the extracting and rectifying tower (2) enters a solvent recovery tower (3) for recovery; after recovery, a bottom material flow of the solvent recovery tower (3) returns to the extracting and rectifying tower (2); and a top material flow of the solvent recovery tower (3) flows back to a tank zone as a heavy component. The production method has the advantages of high product purity and low energy consumption of facilities.

Description

technical field [0001] The present invention relates to a kind of production method of high-purity n-heptane in petrochemical industry, namely use straight run, oil field light hydrocarbon or reforming raffinate to remove impurity through hydrogenation and then separate, and the obtained C7 fraction is used as raw material, using N - Formylmorpholine (NMF) + ethylene glycol (EG) compound extraction solvent for extraction and rectification, and product purification to obtain a production method for high-purity n-heptane. Background technique [0002] Heptane is one of the most widely used hydrocarbon solvents in industry and one of the most representative non-polar solvents. As an important chemical raw material and solvent, n-heptane has been widely used in industries such as medicine, chemical industry, polymer materials, rubber industry and food analysis. Many well-known foreign companies have this product, and most companies use synthetic methods to produce high-purity n...

Claims

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Application Information

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IPC IPC(8): C07C9/15C07C7/04
Inventor 孙秋荣汤红年
Owner SINOPEC GUANGZHOU ENG