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Method for purifying isopropyl alcohol

A technology of isopropanol and feed materials, which is applied in the direction of organic chemical methods, chemical instruments and methods, and the preparation of organic compounds, and can solve problems such as energy consumption

Active Publication Date: 2016-04-06
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, water having a boiling point of about 100°C at atmospheric pressure and IPA having a boiling point of 82.5°C form a common ratio of 87.9 wt% IPA at a temperature of 80.4°C, and thus need to be removed by removing High-purity IPA is produced efficiently from water and a large amount of energy is consumed to remove the water in a simple distillation process

Method used

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  • Method for purifying isopropyl alcohol
  • Method for purifying isopropyl alcohol
  • Method for purifying isopropyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as Figure 4 Isopropanol (IPA) was purified using a dehydration unit and a dividing wall column (DWC) connected to the dehydration unit as shown in . Specifically, a device in which a membrane system and a tower packed with molecular sieves are sequentially connected is used as the dehydration device, a pervaporation system including a membrane (Pervatech company, HybSi membrane) device and a vacuum device is used as the membrane system, and a device with about A microporous zeolite 3A with an average effective pore size of about 3m is used as the molecular sieve 3 The packing volume of the two columns. Here, using a 3 / hr flow rate of nitrogen to the device for molecular sieve regeneration. A liquid feed comprising 98.6 wt% of IPA, about 3000 ppm of water and about 1.1 wt% of other impurities was used as feed. Feed was supplied to the dehydration unit at 90° C. to adjust the water content in the feed passing through the pervaporation system to about 1000 ppm,...

Embodiment 2

[0071] Purification was performed by the same method as described in Example 1 except that the reflux ratio of the top region was adjusted to 85.

Embodiment 3

[0073] Purification was performed by the same method as described in Example 1 except that the reflux ratio of the top region was adjusted to 76.

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PUM

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Abstract

The present application relates to a method and an apparatus for purifying isopropyl alcohol. In the present application, water can be effectively removed from a feed comprising water and isopropyl alcohol with a minimum of energy consumption, thereby allowing highly pure isopropyl alcohol to be obtained.

Description

technical field [0001] The present invention relates to a method and a device for purifying isopropanol. Background technique [0002] Isopropyl alcohol (IPA) is used in a variety of applications including, for example, as a cleaning agent in the electronics industry to manufacture semiconductors or liquid crystal displays (LCDs). [0003] IPA can be prepared using propylene or acetone. In most cases, in the process of preparing IPA, an IPA reaction product containing a large amount of water is obtained, and said reaction product forms an azeotrope containing water. That is, water having a boiling point of about 100°C at atmospheric pressure and IPA having a boiling point of 82.5°C form a common ratio of 87.9 wt% IPA at a temperature of 80.4°C, and thus need to be removed by removing High-purity IPA is efficiently produced from water, and a large amount of energy is consumed to remove the water in a simple distillation process. A distillation method adding an entrainer wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C29/80C07C31/10C07B63/00
CPCC07C29/80B01D2311/08B01D2311/2626B01D61/366B01D61/362C07C29/76B01D61/363C07C31/10
Inventor 朴锺瑞李成圭申俊浩李锺求
Owner LG CHEM LTD
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