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Technique for preparing absolute ethanol from near-azeotropic-concentration ethanol-water mixture

An anhydrous ethanol and mixture technology, which is applied in the preparation of hydroxyl compounds, organic compounds, ethers, etc., can solve the problems of incomplete water removal and the concentration of ethanol products cannot reach anhydrous ethanol, and achieve fast reaction speed and inhibition The formation of by-products, the effect of good economic benefits

Inactive Publication Date: 2014-05-21
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional technology, this method adopts reactive distillation technology, which can save energy consumption and reduce investment costs, but this method has the limitation of incomplete water removal in practical application
Since the isobutene hydration reaction is a reversible reaction with a chemical reaction balance, even if a large feed ratio of 7:1 isobutene and water is used, the maximum conversion rate of water can only reach 90%, and the concentration of the obtained ethanol product cannot reach absolute ethanol requirements

Method used

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  • Technique for preparing absolute ethanol from near-azeotropic-concentration ethanol-water mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 As shown, the reactive distillation column includes a rectification section 6, a reaction section 7, a stripping section 8, a product outlet 9 at the top of the tower and a condenser 4, a product outlet 10 at the bottom of the tower and a reboiler 5. An ethanol-water mixture feed port and 2 ethylene oxide feed ports are set in the reaction section 7. The equipment and structural parameters of the reactive distillation tower are: the reactive distillation tower is provided with 25 theoretical plates, and the ethanol-water mixture Feed port 1 is arranged on the 20th board, and the upper and lower feed ports 2 and 3 of ethylene oxide are respectively arranged on the 15th and 10th boards.

[0044] The operating conditions of the reactive distillation column are: the feed flow rate of the ethanol-water mixture is 200 kmol / h, in which water accounts for 20% (mol fraction), and the feed port is set at the ethylene oxide feed flow rate on the 15th stage The fe...

Embodiment 2

[0050] The structure of the reactive distillation tower is the same as in Example 1, and the equipment and structural parameters are: the reactive distillation tower is provided with 30 theoretical trays, the ethanol-water mixture inlet is arranged on the 22nd plate, and ethylene oxide is fed up and down. The feed ports are respectively arranged on the 17th and 11th boards.

[0051] The operating conditions of the reactive distillation column are: the feed flow rate of the ethanol-water mixture is 200 kmol / h, in which water accounts for 15% (mol fraction), and the feed port is set at the ethylene oxide feed flow rate on the 17th stage The feed flow rate of ethylene oxide at the 10th stage is 32 kmol / h, the feed molar flow ratio of ethylene oxide and water is 2.06:1, and the operating pressure is 0.3 MPa. The flow rate of the overhead distillate is 170 kmol / h, the reflux ratio is 10, the temperature at the top of the tower is 381.65 K, and the temperature at the bottom of the t...

Embodiment 3

[0057] The structure of the reactive distillation tower is the same as in Example 1, and the equipment and structural parameters are: the reactive distillation tower is provided with 30 theoretical trays, the ethanol-water mixture inlet is arranged on the 22nd plate, and ethylene oxide is fed up and down. The feed ports are respectively arranged on the 17th and 11th boards.

[0058] The operating conditions of the reactive distillation column are: the feed flow rate of the ethanol-water mixture is 200 kmol / h, in which water accounts for 11% (mol fraction), and the feed port is set at the ethylene oxide feed flow rate on the 17th stage The feed flow rate of ethylene oxide at the 10th stage is 22 kmol / h, the feed molar flow ratio of ethylene oxide and water is 1.90:1, and the operating pressure is 0.5 MPa. The flow rate of the distillate at the top of the tower is 178 kmol / h, the reflux ratio is 11, the temperature at the top of the tower is 398.69 K, and the temperature at the ...

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Abstract

The invention relates to a technique for preparing absolute ethanol by removing water from a near-azeotropic-concentration ethanol-water mixture, which is characterized in that water in the near-azeotropic-concentration ethanol-water mixture is converted into ethylene glycol and other products through epoxyethane hydration reaction in a reaction rectification tower, and the reaction products and ethanol are synchronously separated in the tower, thereby obtaining the absolute ethanol from the top of the reaction rectification tower and obtaining the ethylene glycol and other hydrate products from the bottom of the tower. The invention can thoroughly remove water and integrate the chemical reaction and product separation; in the process of preparing the absolute ethanol, the ethylene glycol and other valuable byproducts can be obtained; and the system does not need to discharge waste, thereby being energy-saving and environment-friendly, and having favorable application development prospects.

Description

technical field [0001] The invention relates to a process for preparing absolute ethanol by removing water from an ethanol-water mixture with near azeotropic concentration, and belongs to the technical field of organic chemical industry. technical background [0002] Ethanol is a very important organic chemical raw material with more than 300 kinds of products, which are widely used in food, chemical reagents, medicine, paint, pigment, cosmetics, fuel, fragrance, national defense, electronics, aerospace and other industrial fields. Generally speaking, ethanol can be divided into three grades: industrial ethanol, edible ethanol and absolute ethanol, among which absolute ethanol usually refers to ethanol with a volume concentration greater than 99.5%. Since ethanol can be used as a renewable resource and can partially replace petroleum and other non-renewable fossil energy sources, its production technology has attracted more and more attention. In recent years, absolute etha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/88C07C29/80C07C43/13C07C43/11C07C41/03C07C31/20C07C29/04
Inventor 安维中陈珺
Owner OCEAN UNIV OF CHINA