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Process and apparatus for preparing absolute ethyl alcohol

A technology of absolute ethanol and process methods, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as high energy consumption and complicated process flow, and achieve the effect of saving equipment investment

Inactive Publication Date: 2009-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the whole process is complex and energy-intensive

Method used

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  • Process and apparatus for preparing absolute ethyl alcohol
  • Process and apparatus for preparing absolute ethyl alcohol

Examples

Experimental program
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Effect test

example 1

[0019] Example 1: if figure 1 process shown. The azeotropic rectification dividing wall column (5) is a tray column with a diameter of 1000mm and a height of 31000mm. Wherein the number of trays in the public rectification section (1) is 5, the number of trays in the dehydration section (2) is 60, and the number of trays in the side stripping section (3) is 54. The ratio of the cross-sectional area of ​​the dehydration section (2) to the side stripping section (3) is 1.38:1, and the mass flow ratio of the liquid entering the dehydration section (2) to the side stripping section (3) is 12.11:1. In this example, cyclohexane is used as entrainer, and the raw material ethanol aqueous solution feed position (counting from top to bottom, the same below) is the 8th tray of dehydration section (2), the heavy phase in the phase separator (4) The reflux feed position is the first tray of the side stripping section (3), and the supplementary entrainer is added from the phase separator ...

example 2

[0022] Example 2: if figure 1 process shown. The azeotropic rectification dividing wall column (5) is a tray and packing mixed tower with a diameter of 1200mm and a height of 30000mm, wherein the public rectification section (1) uses packing, and the height of the packing layer is 1000mm. The dehydration section (2) and the side line The stripping section (3) uses trays, wherein the number of trays in the dehydration section (2) is 60, and the number of trays in the side stripping section (3) is 54. The ratio of the cross-sectional area of ​​the dehydration section (2) to the side stripping section (3) is 1.31:1, and the mass flow ratio of the liquid entering the dehydration section (2) to the side stripping section (3) is 10.60:1. Feed heat state, feed composition, feed flow rate are the same as example 1, and entrainer is still hexanaphthene, but feed position changes to some extent, and feed position is the 10th tray of dehydration section (2), each stream The flow rate a...

example 3

[0025] Example 3: if figure 1 process shown. The azeotropic rectification dividing wall column (5) is a tray column with a diameter of 1000mm and a height of 31000mm. Wherein the number of trays in the public rectification section (1) is 5, the number of trays in the dehydration section (2) is 60, and the number of trays in the side stripping section (3) is 54. The ratio of the cross-sectional area of ​​the dehydration section (2) to the side stripping section (3) is 1.57:1, and the mass flow ratio of the liquid entering the dehydration section (2) to the side stripping section (3) is 8.80:1. Feed heat state, feed flow are the same as example 1, entrainer is still hexanaphthene, just the ethanol content in the feed becomes 92% (mass fraction), feed position is the 12th block tower of dehydration section (2) The flow rate and composition of each stream are shown in Table 3. The temperature at the top of the tower is 68.5°C, the pressure is 0.12MPa, the temperature of the bot...

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Abstract

The invention relates to a novel azeotropic distillation process method and a device thereof, in particular to a process method which use a septal azeotropic distillation column (5) to produce absolute alcohol, and a device thereof. The septal azeotropic distillation column (5) is achieved by arranging a septal wall (6) in the azeotropic distillation column in the vertical direction, and the septal wall (6) divides the space of the azeotropic distillation column into three areas with different functions; a public distillation part (1), a dehydration part (2) and a side stripper part (3). The alcohol solution to be separated is filled to the azeotropic distillation column from the upper part of the dehydration part (2), and the absolute alcohol is obtained at the bottom of the dehydration part (2); ternary azeotrope is steamed out of the top of the column, and condensed by a condenser (7) and then splitted into light phase solution and heavy phase solution in a phase splitter; the light phase solution (entrainer) reflows and the heavy phase solution is the feed stock in the side stripper part (3), and little water containing alcohol is obtained at the bottom of the side stripper part (3). The device and the process method of the invention can produce the absolute alcohol, and can simplify the process, reduce the energy consumption and the cost of the divices.

Description

technical field [0001] The invention relates to a process and device for producing absolute ethanol, in particular to a process and device for producing absolute ethanol by using an azeotropic rectification bulkhead tower, which can recover the ethanol azeotropic rectification tower and entrainer The towers are integrated into the same tower. Background technique [0002] Absolute ethanol is a commonly used chemical raw material. It is not only used in electronics, aerospace and other industries, but also used as a solvent in medicine, pesticides and oil leaching. Moreover, the mixture of anhydrous ethanol and gasoline (commonly known as gasoline alcohol) can be used as a solvent for internal combustion engines. fuel. Some countries in the world have decided to use gasoline alcohol as a power fuel. With the reduction of world oil resources, anhydrous ethanol as a biofuel may occupy a place in the power fuel in the future. In addition, it can also be used as a raw material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/80C07C29/82
Inventor 孙兰义胡有元李军郭晓燕李青松
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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