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An energy-saving method for separating hexane, heptane and octane under reduced pressure using a dividing wall tower

A technology of decompression separation and partition tower, which is applied in distillation purification/separation, sustainable manufacturing/processing, chemical industry, etc., can solve the problems of small investment, low energy consumption, high energy consumption, reduce heat load and The effect of the consumption problem

Active Publication Date: 2016-11-23
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high energy consumption in the existing rectification process, and to provide a new energy-saving method for separating hexane, heptane, and octane under reduced pressure in a dividing wall tower. The method has the advantages of small investment and low energy consumption. The advantages

Method used

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  • An energy-saving method for separating hexane, heptane and octane under reduced pressure using a dividing wall tower
  • An energy-saving method for separating hexane, heptane and octane under reduced pressure using a dividing wall tower
  • An energy-saving method for separating hexane, heptane and octane under reduced pressure using a dividing wall tower

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Experimental program
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Effect test

Embodiment 1

[0035] use figure 1 In the process shown, the feed rate of the mixture of hexane, heptane, and octane to be separated is 30 kmol / h, the feed temperature is 20°C, and the molar ratio of hexane, heptane, and octane is 1:2:1 . There are 30 theoretical plates on both sides of the vertical wall of the adopted dividing wall tower, 12 theoretical plates on the upper part of the vertical wall, and 12 theoretical plates on the lower part. in Table 1.

[0036] use figure 1 In the process shown, other conditions remain unchanged, the operating pressure is changed to 10kPa (vacuum dividing wall tower), the top reflux ratio is 6, the side line is taken out at the middle position on the right side of the vertical wall, and the production volume is 15kmol / h. The result Also listed in Table 1.

[0037] use figure 2 In the flow shown, the feed amount and feed mole composition remain unchanged. Tower I has 26 theoretical plates in total, the 22nd plate feeds, and the reflux ratio is 2.8. ...

Embodiment 2

[0041] use figure 1 In the flow process shown, under the condition that the feed amount and feed temperature are constant, the molar ratio of hexane, heptane, and octane is changed to 1:1:1. There are 30 theoretical plates respectively in the vertical wall 5 both sides of the dividing wall tower that adopts, and 12 theoretical plates are arranged in the vertical wall top, and 12 theoretical plates are arranged in the lower part, and operating pressure is 101.325kPa (atmospheric pressure dividing wall tower), and tower top reflux ratio is 6 , the flow rate of the tower bottom product is 7.5kmol / h, and the side line is extracted from the middle position on the right side of the vertical wall, and the output is 10kmol / h. The results are listed in Table 2.

[0042] use figure 1 In the flow process shown, other conditions remain unchanged, the operating pressure is changed to 10kPa (vacuum dividing wall column), the top reflux ratio is 6, and the side line production is 10kmol / h. ...

Embodiment 3

[0048] use figure 1In the shown process, under the condition that the feed amount and feed temperature are constant, the molar ratio of hexane, heptane, and octane is changed to 2:1:1. There are 30 theoretical plates respectively on both sides of the vertical wall of the dividing wall tower adopted, 12 theoretical plates are arranged on the vertical wall top, and 12 theoretical plates are arranged on the lower part, the operating pressure is 101.325kPa (atmospheric pressure dividing wall tower), and the reflux ratio at the top of the tower is 6, The lateral line is produced at the middle position on the right side of the vertical wall, and the production rate is 4.5 kmol / h. The results are listed in Table 3.

[0049] use figure 1 In the flow process shown, other conditions remain unchanged, the operating pressure is changed to 10kPa (vacuum dividing wall column), the top reflux ratio is 6, and the side line production is 4.5kmol / h. The results are also listed in Table 3.

[...

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Abstract

The invention relates to an energy saving method for reduced pressure separation of hexane, heptane and octane by a wall separation tower. According to the method, a single-tower continuous rectification is adopted, and the interior of the wall separation tower is divided into four working sections by vertical walls; a to-be-separated mixture of hexane, heptane and octane enters from the middle part of a pre-fractionation section, and separation of heptane and octane is completed; separation of hexane and heptane is completed in a main tower section, and the intermediate component heptane is extracted from a side line of the middle part of the main tower section; the light component hexane is extracted from the top of a public stripping section; the heavy component octane is extracted from the bottom of a public rectification section, and thus the separation of hexane, heptane and octane is realized. By adopting the method, under the same separation requirement, the method can reduce thermal load of a tower kettle reboiler and a tower top condenser and solve the problem of energy consumption in the rectification process compared with ordinary two-tower reduced pressure distillation and an ordinary-pressure wall separation tower.

Description

technical field [0001] The invention relates to an energy-saving method for separating hexane, heptane and octane under reduced pressure using a dividing wall tower. Background technique [0002] Distillation is one of the most mature and widely used separation techniques in contemporary chemical production. However, the energy consumption of the rectification process is huge, 40-70% of the energy consumption in the chemical process is used for separation, and the energy consumption of rectification accounts for 95% of it. 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 components, the energy consumption of double-column vacuum rectification is large, while the vacuum distillation in the dividing wall column can greatly reduce energy consumption. [0003] The dividing wall rectification column is divided into upper and lower sections by setting a vertical wall ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C07C9/15
CPCY02P20/10
Inventor 李春利方静宋媛媛王荣良
Owner HEBEI UNIV OF TECH