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Method for preparing hyperpure isopropyl alcohol

A technology of ultra-pure isopropanol and industrial isopropanol, which is applied in the field of preparation of ultra-pure isopropanol, can solve the problems of high cost, high water content and impurity content, difficult post-processing, etc., and achieve stable quality and low impurity content Low, easy-to-operate effect

Inactive Publication Date: 2008-07-02
SINOPHARM CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a preparation method of ultra-pure isopropanol, to overcome the deficiencies in the prior art that the water content and impurity content of the product are high, the cost is high, and the post-processing is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a 5000ml three-necked flask, drop into 3000ml of 98% industrial isopropanol with anhydrous sodium carbonate to adjust the pH value to 5.5, calcium hydride 5g, heat and reflux for 2 hours, and carry out 2-stage continuous rectification through a rectification device (rectification column φ3×25mm glass spring packing is installed inside), the temperature is controlled at 82.0-83.0°C, and the middle distillate is collected in a 2000ml quartz three-neck flask; heated to reflux for 1.5 hours, and the fraction at 81.8-82.2°C is collected in a quartz fractionation device, and the pore size is The 0.1μm PVDF membrane is used for membrane filtration, and the number of particles with a particle size greater than 0.5μm is controlled at 20 or less, and the number of particles with a particle size greater than 0.2μm is controlled at 200 or less; in a purification box pre-filled with nitrogen Collect target product, obtain ultrapure isopropanol 1800ml, sampling analysis, analysis d...

Embodiment 2

[0023] In a three-necked flask of 5000ml, drop into 3000ml of 98% industrial isopropanol with anhydrous sodium carbonate to adjust the pH value to 7.0, calcium hydride 3g, heat and reflux for 3 hours, and carry out 2-stage continuous rectification (rectification column) φ3×25mm glass spring packing is installed inside), the temperature is controlled at 82.0-83.0°C, and the middle distillate is collected in a 2000ml quartz three-neck flask; heated to reflux for 1.5 hours, and the fraction at 81.8-82.2°C is collected in a quartz fractionation device, and the pore size is The 0.1μm PVDF membrane is used for membrane filtration, and the number of particles with a particle size greater than 0.5μm is controlled at 20 or less, and the number of particles with a particle size greater than 0.2μm is controlled at 200 or less; in a purification box pre-filled with nitrogen Collect target product, obtain ultrapure isopropanol 1800ml, sampling analysis, analysis data are shown in Table 1. ...

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Abstract

A process for preparing superpure isopropanol from industrial isopropanol includes regulating pH value by carbonate, adding dewatering agent, reflux reaction, rectifying, distilling, and membrane filtering.

Description

technical field [0001] The invention relates to a preparation method of ultra-pure isopropanol. Background technique [0002] With the development of the information industry, various new materials, new technologies, and new processes have put forward higher requirements for the use of related materials, such as semiconductors and large-scale integrated circuits, which require higher and higher purity for the isopropanol used. From high-purity isopropanol (the content of metal ions is ppm level) to ultra-pure isopropanol (the content of metal ions is ppb level). As an important microelectronic chemical, ultra-pure isopropanol is widely used in cleaning and drying in the assembly and processing of semiconductors and large-scale integrated circuits. Material part grade 12 - SEMI C12 standard (hereinafter referred to as SEMI C12 standard), that is, the main body content is greater than 99.80%, the water content is less than 50ppm, the cation content is less than 0.1ppb, and th...

Claims

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Application Information

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IPC IPC(8): C07C31/10C07C29/76
Inventor 顾小焱吴孝兰马光娱
Owner SINOPHARM CHEM REAGENT