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Apparatus and method for separating tert-butanol and water using batch fractionating and pervaporation

A technology of pervaporation and tert-butanol, which is applied in separation methods, chemical instruments and methods, separation/purification of hydroxyl compounds, etc., can solve the problems of low yield, achieve high purity, wide application range, and convenient operation

Inactive Publication Date: 2009-02-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1760165A discloses the method for separating tert-butanol and water by heterogeneous azeotropic rectification. The method introduces the third substance cyclohexane. As an important solvent in industrial production, cyclohexane needs to be recovered. The purity that obtains tert-butanol is 98.2%, and product quality is not very high, and yield is 52%, and yield is low

Method used

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  • Apparatus and method for separating tert-butanol and water using batch fractionating and pervaporation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 The diagram of the device is shown. Put 600ml of tert-butanol-water solution containing 80% tert-butanol into the still of the batch rectification tower to check the tightness of the system. First close the valve B at the outlet of the condensate at the top of the tower, open the valve A, pass the cooling water into the condenser at the top of the tower, turn on the heating power supply to heat the tower kettle, and perform the full reflux operation after there is reflux at the top of the tower, and the total reflux is 1.5 Hours, the gas-liquid balance in the tower was stable, and the temperature of the condensate at the top of the tower was stable at 62.5°C. Switch the condensate outlet valve, close valve A, open valve B, so that the azeotrope of tert-butanol-water enters the membrane separator, and further dehydration and separation are carried out in the membrane separator, and the tert-butanol concentrated on the intercepted side enters the rectifi...

Embodiment 2

[0024] Such as figure 1 The diagram of the device is shown. Put 600ml of tert-butanol-water solution containing 88% tert-butanol into the still of the batch rectification tower to check the tightness of the system. First close the valve B at the outlet of the condensate at the top of the tower, open the valve A, pass the cooling water into the condenser at the top of the tower, turn on the heating power supply to heat the tower kettle, and perform the full reflux operation after there is reflux at the top of the tower, and the total reflux is 1.5 Hours, the gas-liquid balance in the tower was stable, and the temperature of the condensate at the top of the tower was stable at 62.5°C. Switch the condensate outlet valve, close valve A, open valve B, so that the azeotrope of tert-butanol-water enters the membrane separator, and further dehydration and separation are carried out in the membrane separator, and the tert-butanol concentrated on the intercepted side enters the rectifi...

Embodiment 3

[0026] The diagram of the device is shown in Figure 3. Put 600ml of tert-butanol-water solution containing 92% tert-butanol into the still of the batch distillation tower to check the tightness of the system. First close the valve B at the top condenser, open the valve A, pass cooling water into the top condenser, turn on the heating power supply to heat the tower kettle, and perform full reflux operation after there is reflux at the top of the tower, full reflux for 1.5 hours , the gas-liquid balance in the tower is stable, and the temperature of the condensate at the top of the tower is stable at 62.5°C. Switch the condensate outlet valve, close valve A, open valve B, so that the azeotrope of tert-butanol-water enters the membrane separator, and further dehydration and separation are carried out in the membrane separator, and the tert-butanol concentrated on the intercepted side enters the rectification tower Circulation in the tower, the permeation side uses a water jet pu...

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Abstract

The invention relates to a device and a method for separating tert-butyl alcohol from water by combining batch rectification and pervaporation. The device mainly comprises a rectification tower body, a rectification tower kettle, a condenser, a membrane separator, a water jet pump, a condensate storage tank and a circulating pump. The tert-butyl alcohol aqueous solution is added to the batch rectification tower kettle, and firstly total-reflux operation is carried out in the batch rectification tower by switching a valve positioned at the condensate outlet at the tower top; after the mixture in the tower becomes stable, azeotrope of the tert-butyl alcohol and the water enters the membrane separator by the condenser for further dehydration and separation; osmotic lateral pressure is kept at 1000Pa by the jetting of the water jet pump, thus the tert-butyl alcohol and the water in the tert-butyl alcohol aqueous solution are separated by the membrane separator; the high-concentration tert-butyl product can be obtained from the rectification tower kettle, and the water is vaporized at the downstream of the membrane separator by an osmotic membrane; after vaporization and condensation, the high-concentration tert-butyl product is put in the condensate storage tank, and then cooled by the condenser and sent to the water jet pump by the circulating pump for circulation. The method has the advantages of simple operations and high tert-butyl alcohol yield without adding other solvents.

Description

technical field [0001] The present invention relates to the separation of azeotropes, in particular to a device and method for separating tert-butanol and water jointly by batch rectification and pervaporation, specifically a total reflux batch rectification-water jet decompression pervaporation coupled separation of tert-butanol - Water methods and apparatus. Background technique [0002] Tert-butanol (TBA), also known as tert-butanol trimethylmethanol, is a colorless crystal or transparent liquid with camphor odor at room temperature. It is highly hygroscopic and soluble in most organic solvents, such as alcohols, esters, ethers, fats Hydrocarbons and aromatic hydrocarbons are important solvents and additives in industrial production. Tert-butanol is widely used as a solvent, such as wax solvent, paint solvent, medical solvent, nitrocellulose, and synthetic resin solvent and thinner. It can also be used as a raw material for artificial musk, as well as for the synthesis ...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C31/12B01D3/16B01D53/22
Inventor 张文白鹏黄碧慧叶秀丝姜占坤
Owner TIANJIN UNIV
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