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A method for producing absolute ethanol without flushing

An anhydrous ethanol, rinse-free technology, applied in the separation/purification of hydroxyl compounds, organic chemistry, etc., can solve the problems of inability to make full use of ethanol solution, low yield of anhydrous ethanol, high cost, etc., to achieve full utilization and good Regeneration effect, energy saving effect

Active Publication Date: 2015-11-25
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages that the existing molecular sieve adsorption dehydration process for ethanol solution cannot make full use of ethanol solution, the yield of absolute ethanol is low, the energy consumption is large, and the cost is high. method

Method used

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  • A method for producing absolute ethanol without flushing
  • A method for producing absolute ethanol without flushing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 Shown, a kind of method for making absolute ethanol without flushing circulation, comprises the following steps:

[0043] A. The ethanol water saturated steam with a mass concentration of 92% is heated to 120°C through the heat exchanger A61 to form ethanol water superheated steam.

[0044]B. Open valve A71 and valve E75, close valve B72, send the ethanol water superheated steam into the ethanol dehydration tower A1 for adsorption dehydration, the pressure of the ethanol dehydration tower A1 is 0.1Mpa, and the ethanol water superheated steam enters from the top of the ethanol dehydration tower A1, After passing through the adsorption bed, the water is absorbed by the molecular sieve to obtain anhydrous ethanol vapor. Open the valve E75, release the absolute ethanol vapor from the bottom of the ethanol dehydration tower A1, and store it in a liquid state at room temperature through the heat exchanger B62 to obtain the absolute ethanol product with a m...

Embodiment 2

[0053] Such as figure 1 Shown, a kind of method for making absolute ethanol without flushing circulation, comprises the following steps:

[0054] A. The ethanol water saturated steam with a mass concentration of 92% is heated to 130°C through the heat exchanger A61 to form ethanol water superheated steam.

[0055] B. Open valve A71 and valve E75, close valve B72, send the ethanol water superheated steam into the ethanol dehydration tower A1 for adsorption dehydration, the pressure of the ethanol dehydration tower A1 is 2.4Mpa, and the ethanol water superheated steam enters from the top of the ethanol dehydration tower A1, After passing through the adsorption bed, the water is absorbed by the molecular sieve to obtain anhydrous ethanol vapor. Open the valve E75, release the absolute ethanol vapor from the bottom of the ethanol dehydration tower A1, and store it in a liquid state at room temperature through the heat exchanger B62 to obtain the absolute ethanol product with a ...

Embodiment 3

[0064] Such as figure 1 Shown, a kind of method for making absolute ethanol without flushing circulation, comprises the following steps:

[0065] A. The ethanol water saturated steam with a mass concentration of 92% is heated to 135°C through the heat exchanger A61 to form ethanol water superheated steam.

[0066] B. Open valve A71 and valve E75, close valve B72, send the ethanol water superheated steam into the ethanol dehydration tower A1 for adsorption dehydration, the pressure of the ethanol dehydration tower A1 is 2.5Mpa, and the ethanol water superheated steam enters from the top of the ethanol dehydration tower A1, After passing through the adsorption bed, the water is absorbed by the molecular sieve to obtain anhydrous ethanol vapor. Open the valve E75, release the absolute ethanol vapor from the bottom of the ethanol dehydration tower A1, and store it in a liquid state at room temperature through the heat exchanger B62 to obtain the absolute ethanol product with a ...

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Abstract

The invention discloses a method for preparing absolute ethyl alcohol circularly without washing. The method comprises the steps of A), subjecting ethanol water to saturated heating to form ethanol water superheated vapor; B), feeding the ethanol water superheated vapor into an ethanol dehydrating tower for adsorption dewatering; C), releasing a low-concentration ethanol medium in the ethanol dehydrating tower and storing the low-concentration ethanol medium; D), pumping vacuum, keeping the vacuum degree inside the ethanol dehydrating tower from subzero 0.091 MPa to subzero0.094 MPa, completing regeneration of a molecular sieve and storing the low-concentration ethanol medium obtained in the vacuum-pumping process; E), feeding the low-concentration ethanol medium stored in the step C) and the step D) into a rectifying tower for rectifying; and F), heating the ethanol water saturated vapor obtained in the step E) to form the ethanol water superheated vapor, and then feeding the ethanol water superheated vapor into the ethanol dehydrating tower for adsorption dewatering. The method has the advantages that the ethanol solution can be used fully, the yield of the absolute ethyl alcohol is high, and the energy consumption and the cost are low.

Description

technical field [0001] The invention relates to a method for producing absolute ethanol, in particular to a method for producing absolute ethanol without flushing and circulation. Background technique [0002] Anhydrous ethanol is an important organic solvent, widely used in various aspects such as medicine, paint, sanitary products, cosmetics, oil and so on. At the same time, absolute ethanol is also an important basic chemical raw material, which is used to manufacture chemical substances such as acetaldehyde, ethylenediene, ethylamine, ethyl acetate, acetic acid, and ethyl chloride, and to derive medicines, dyes, paints, fragrances, synthetic There are many intermediates of rubber, detergent, pesticides and other products, and there are more than 300 kinds of products. [0003] Traditional anhydrous ethanol production methods include azeotropic distillation, extractive distillation and membrane separation, but these methods will inevitably bring in some impurities, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/76
Inventor 钟娅玲曾启明钟雨明王力陈天洪高利梅
Owner SICHUAN TECHAIRS