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A New Process for Producing Anhydrous Ethanol by Rectification and Pervaporation

A technology of pervaporation and anhydrous ethanol, which is applied in the chemical industry, can solve problems such as high cost, high pollution, and high risk, and achieve the effects of reducing production cost, simple production process, and small footprint

Inactive Publication Date: 2011-11-30
白银阳明银光化工有限公司
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  • Application Information

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Problems solved by technology

These methods can all realize the production of dehydrated ethanol with a conventional water content of 0.5%, but when faced with anhydrous ethanol with a water content of less than 0.1%, during production, either the goal cannot be achieved at all, or high costs, high energy consumption, and high pollution must be paid. High risk, low efficiency and other costs

Method used

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  • A New Process for Producing Anhydrous Ethanol by Rectification and Pervaporation
  • A New Process for Producing Anhydrous Ethanol by Rectification and Pervaporation
  • A New Process for Producing Anhydrous Ethanol by Rectification and Pervaporation

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Embodiment 1

[0016] Example 1: See figure 1 , A new process for the production of absolute ethanol by distillation pervaporation, the steps are as follows:

[0017] (1) The mixed ethanol solution containing 20%-80% water in the raw material tank 1 enters the high-level tank 4 through the A feed pump 5, and then enters the rectification tower 2. The rectification tower has 100 trays, and the temperature of the tower is maintained. 80-90℃, the top temperature of the tower is 78℃, rectification is carried out, and the ethanol produced is condensed by condenser 3, that is, 95% ethanol enters the 95% ethanol tank 6;

[0018] (2) The 95% ethanol solution enters the preheater 4 through the B feed pump 7 to be heated to 80°C-90°C, the flow is controlled to 100-400L / h, and then enters the pervaporation membrane module 9 for separation. Membrane module 9 is composed of ten pervaporation membranes in series, and the membrane area of ​​each membrane is 13.2m 2 , 95% ethanol solution passes through ten perv...

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Abstract

The invention relates to a new process for producing anhydrous ethanol by rectification pervaporation, which is characterized in that it comprises the following steps: (1) entering the mixed ethanol solution containing 20%-80% water into a rectification tower for rectification to yield 95% Ethanol; (2) 95% ethanol is heated to 88°C-91°C to enter the pervaporation membrane module for separation, and the flow rate of 95% ethanol entering the pervaporation membrane module is 100-400L / h. The production process is simple and safe, does not add any third component, has low energy consumption, is green and environmentally friendly, occupies a small area, and greatly reduces the production cost of anhydrous ethanol.

Description

Technical field [0001] The invention belongs to the field of chemical industry, and relates to a production method of chemical products, in particular to a new process for producing anhydrous ethanol. Background technique [0002] There are many methods for industrial production of absolute ethanol, the common ones are reaction method (magnesium method, calcium method, etc.), molecular sieve adsorption method, ternary azeotropic distillation method, extractive distillation method, etc. These methods can all achieve the production of conventional absolute ethanol with a water content of 0.5%. However, in the face of anhydrous ethanol with a water content of less than 0.1%, during production, it is either impossible to achieve the goal at all, or high costs, high energy consumption, and high pollution must be paid. High risk, low efficiency and other costs. Summary of the invention [0003] The purpose of the present invention is to avoid the shortcomings of the prior art and provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/76B01D61/36
Inventor 路发明路涛
Owner 白银阳明银光化工有限公司
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