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A method for separating pentane, hexane, heptane and octane mixture system

A technology for separating pentane and mixtures, which is applied in the field of octane mixture systems to separate pentane, hexane, and heptane. It can solve the problems of high energy consumption, low separation purity, and large investment, and achieve heat transfer load reduction, Good technical effect and reduced equipment investment

Active Publication Date: 2018-01-23
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of complex separation process of pentane, hexane, heptane and octane mixture in the traditional three-tower process flow, low separation purity, large investment and high energy consumption, and provides a new Method for separating mixtures of pentane, hexane, heptane and octane

Method used

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  • A method for separating pentane, hexane, heptane and octane mixture system
  • A method for separating pentane, hexane, heptane and octane mixture system
  • A method for separating pentane, hexane, heptane and octane mixture system

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Embodiment 1

[0040] use figure 1 Shown flow process, the feed rate of the pentane, hexane, heptane, octane mixture to be separated is 40kmol / h, and the mol ratio of pentane, hexane, heptane, octane is 1:1:1: 1. The Sargent clapboard rectification column used has 30 trays in the pre-fractionation section, 64 trays in the middle section and sideline extraction section, 10 trays in the common rectification section, and 20 trays in the common stripping section. The production volume is 10 kmol / h; the production position of the hexane stream is the 16th tray of the side line production section, and the production volume is 10 kmol / h; the production position of the heptane stream is the 44th tray of the side line production section At the tray, the output is 10 kmol / h; the reflux ratio at the top of the tower is 11, the operating pressure is normal pressure, and the tower diameter is 3m. The separation effect of the components of the Sargent partitioned rectification column is shown in Table 1...

Embodiment 2

[0047] use figure 1 In the process shown, under the condition of constant feed amount, the molar ratio of pentane, hexane, heptane and octane becomes 1:2:2:1. The Sargent clapboard rectification column used has 30 trays in the pre-fractionation section, 64 trays in the middle section and sideline extraction section, 40 trays in the common rectification section, and 30 trays in the common stripping section. The production volume is 6.67kmol / h; the production position of the hexane stream is at the 16th tray of the side line production section, and the production volume is 13.33 kmol / h; the production position of the heptane stream is the 1st tray of the side line production section. At 44 trays, the output is 13.33kmol / h; the reflux ratio at the top of the tower is 17.2, the operating pressure is normal pressure, and the tower diameter is 2.73m. The separation effect of the components of the Sargent partitioned rectification column is shown in Table 3, and the energy consumpti...

Embodiment 3

[0054] use figure 1 In the process shown, under the condition that the feed amount remains unchanged, the molar ratio of pentane, hexane, heptane, and octane becomes 2:1:1:1. The Sargent clapboard rectification column used has 30 trays in the pre-fractionation section, 64 trays in the middle section and sideline extraction section, 30 trays in the common rectification section, and 30 trays in the common stripping section. The production volume is 8 kmol / h; the production position of the hexane stream is at the 16th tray of the side line production section, and the production volume is 8 kmol / h; the production position of the heptane stream is the 44th tray of the side line production section At the tray, the output is 8 kmol / h; the reflux ratio at the top of the tower is 6.4, and the operating pressure is normal pressure. The diameter of the tower is 2.76m. The separation effect of the components of the Sargent partitioned rectification column is shown in Table 5, and the en...

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Abstract

The invention discloses a method for separating a pentane, hexane, heptane and octane mixture system. A Sargent dividing wall rectifying column is adopted, and three vertical partition boards are arranged in the column to divide the rectifying column into a prefractionation section, a middle section, a public rectifying section, a side-draw section and a public stripping section. The mixture system enters the Sargent dividing wall rectifying column from a 20th column plate of the prefractionation section, pentane flow is extracted from the public rectifying section on the top of the column, hexane flow is extracted from a 16th column plate of the side-draw section in a side-draw mode, heptane flow is extracted from a 44th column plate of the side-draw section in a side-draw mode, and octane is extracted from the public stripping section on the bottom of the column. Product purity is 99% or more in terms of concentration and is identical with that of a conventional rectification direct sequence process. The separation task of the original process can be achieved, and total heat exchange load can be reduced by 42.5% at most compared with the conventional rectification direct sequence.

Description

technical field [0001] The invention relates to a method for separating pentane, hexane, heptane and octane mixture systems. Background technique [0002] Distillation is the most widely used and energy-intensive unit operation in the chemical industry. The energy consumption of the rectification process is huge, and 40-70% of the energy consumption in the chemical process is used for separation, and the energy consumption of rectification accounts for 95% of the energy consumption of separation. The continuous rise of energy prices makes the study of energy-saving technology in the distillation process of great significance. For the separation of ternary or more than ternary components, conventional multi-column rectification consumes a lot of energy, while rectification in clapboard columns can greatly reduce energy consumption. [0003] At present, there are more than 300 partition towers in use in the world. Koch-Glitsh successfully transformed an isohexane solvent rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/15C07C7/04
CPCC07C7/04C07C9/15
Inventor 方静李晓春李春利
Owner HEBEI UNIV OF TECH