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Preparation method for high-purity isopropyl alcohol

A technology of isopropanol and pure isopropanol, applied in the field of preparation of high-purity isopropanol, can solve problems such as no public reports of preparation methods, and achieve stable and reliable large-scale production, stable and reliable batch size, and purification route design. Reasonable and clever effect

Active Publication Date: 2013-01-30
SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, there is no public report on the large-scale preparation of high-quality electronic-grade (moisture, individual anions, and individual cations) isopropanol preparation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A continuous preparation method of high-purity isopropanol, using industrial grade isopropanol (GB 7814-87 industrial grade first-class product) as raw material, comprising the following steps carried out sequentially and continuously:

[0026] (1) Molecular sieve dehydration:

[0027] Pass industrial-grade isopropanol through a 3A molecular sieve column at a constant flow rate, the particle diameter of the molecular sieve is 1.5-2mm, and control the flow rate of isopropanol to 450L / h;

[0028] (2) Resin dehydration:

[0029] Pass the isopropanol dehydrated by the molecular sieve through the polyacrylic water-absorbing resin at a constant flow rate, and control the flow rate of the isopropanol to 450L / h;

[0030] (3) reverse osmosis:

[0031] The isopropanol after high-temperature rectification passes through the reverse osmosis membrane, the reverse osmosis pressure is 2.0-2.8Mpa, the permeation volume is 450L / h, and the control circulation volume is 700-900L / h;

[...

Embodiment 2

[0041] A continuous preparation method of high-purity isopropanol, using industrial grade isopropanol (GB 7814-87 industrial grade first-class product) as raw material, comprising the following steps carried out sequentially and continuously:

[0042] (1) Molecular sieve dehydration:

[0043] Pass industrial-grade isopropanol through a 3A molecular sieve column at a constant flow rate, the particle diameter of the molecular sieve is 1.5-2mm, and control the flow rate of isopropanol to 500L / h;

[0044] (2) Resin dehydration:

[0045] Pass the isopropanol dehydrated by the molecular sieve through the polyacrylic water-absorbing resin at a constant flow rate, and control the flow rate of the isopropanol to 500L / h;

[0046] (3) reverse osmosis:

[0047] Pass the isopropanol after high-temperature rectification through the reverse osmosis membrane, the reverse osmosis pressure is 2.0~2.8Mpa, the control circulation is 700~900L / h, and the permeation is 500L / h;

[0048] (4) high t...

Embodiment 3

[0057] A continuous preparation method of high-purity isopropanol, using industrial grade isopropanol (GB 7814-87 industrial grade first-class product) as raw material, comprising the following steps carried out sequentially and continuously:

[0058] (1) Molecular sieve dehydration:

[0059] Pass industrial-grade isopropanol through a 3A molecular sieve column at a constant flow rate, the particle diameter of the molecular sieve is 1.5-2mm, and control the flow rate of isopropanol to 400L / h;

[0060] (2) Resin dehydration:

[0061] Pass the isopropanol dehydrated by the molecular sieve through the polyacrylic water-absorbing resin at a constant flow rate, and control the flow rate of the isopropanol to 400L / h;

[0062] (3) reverse osmosis:

[0063] Pass the isopropanol after high-temperature rectification through the reverse osmosis membrane, the reverse osmosis pressure is 2.0~2.8Mpa, the control circulation volume is 700~900L / h, and the permeation volume is 400L / h;

[00...

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Abstract

The invention relates to a preparation method for high-purity isopropyl alcohol. The high-purity isopropyl alcohol is prepared by performing molecular sieve dehydration, resin dehydration, reverse osmosis, high-temperature rectification, ion exchange and circular filtration on industrial grade isopropyl alcohol serving as a raw material in sequence and continuously purifying. The purifying route of the preparation method is reasonable and skillful in design, high-purity electronic-grade isopropyl alcohol of which the single cation concentration is less than 10ppt, each single antion concentration is less than 1ppb and the water content is less than 20ppm can be obtained finally, and stable, reliable, batch and mass production of electronic-grade isopropyl alcohol can be realized.

Description

technical field [0001] The invention relates to a method for preparing high-purity isopropanol, in particular to electronic-grade high-purity isopropanol. Background technique [0002] Ultra-clean and high-purity electronic chemicals are key integrated raw materials for VLSI manufacturing, and their purity and cleanliness have a very important impact on yield, electrical performance, and reliability. The current mainstream semiconductor technology has reached 0.09-0.2μm, the tip has reached the 22nm level, and the corresponding electronic chemicals have also reached the SEMIC12 requirements. The production technology of high-purity electronic chemicals is mastered by a few developed countries such as Germany, Japan and the United States. At present, my country can only produce primary and intermediate electronic chemicals. The purity of high-purity electronic chemicals is getting higher and higher, and the added value of products is greater. The R&D and technology of ultra...

Claims

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Application Information

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IPC IPC(8): C07C31/10C07C29/76
Inventor 刘兵王涛胡建康
Owner SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
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