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Method for purifying organic solvents

An organic solvent and hydrophilic technology, which is used in the field of removing metal ion pollutants and non-metal ion pollutants, and can solve the problems of loss of purity of organic solvents and inapplicability of organic solvents.

Pending Publication Date: 2022-02-18
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the previously known methods of purifying organic solvents by ion exchange resins described above are not effective in removing enough ionic contaminants to achieve a fairly high level of solvent purity (i.e., such that the level of metal ion contaminants in the solvent is below parts per billion). 50 [ppb] level of purity); and / or, the aforementioned previously known methods cause various chemical reactions to generate impurities, so that a loss of purity of the resulting organic solvent may occur
Therefore, the resulting organic solvents purified according to previously known methods are not suitable for applications requiring a high level of purity

Method used

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  • Method for purifying organic solvents
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Examples

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example

[0048] Some embodiments of the invention are described in detail in the following examples. Then, the following examples are provided to illustrate the present invention in further detail, but should not be construed as limiting the scope of the claims. All parts and percentages are by weight unless otherwise indicated.

[0049] Various terms and nomenclature used in Inventive Examples (Inv.Ex.) and Comparative Examples (Comp.Ex.) are explained as follows:

[0050] "DVB" stands for divinylbenzene.

[0051] "MR" stands for Grand Network.

[0052] "BV / hour" stands for bed volume / hour.

[0053] "WAC" stands for Weak Acid Cation Ion Exchange Resin, which has the same meaning as Weak Cation Exchange Resin

[0054] "WBA" stands for Weak Base Anion Ion Exchange Resin and has the same meaning as Weak Anion Exchange Resin.

[0055] "SAC" stands for Strong Acid Cation Ion Exchange Resin and has the same meaning as Strong Cation Exchange Resin.

[0056] "SBA" stands for Strong Base...

example 2

[0072] Example 2 - AMBERLITE with Example 1 for solvent mixture TM IRC76 and AMBERLITE TM IRA98 1:1 volume ratio mixed resin bed

[0073] In this Example 2, 50 mL of the hydrated state of AMBERLITE TM IRC76 resin and 50mL AMBERLITE TM IRA98 resin blend. After flowing ultrapure water at 4 BV / hour for 12 hours, the mixed resin was dried in a vacuum oven (50° C., 10 mmHg, and 24 hours). The dried mixed resin was loaded into a Teflon column with an inner diameter of 50 mm and a length of 150 mm. DOWANOL TM PM and DOWANOL TM A total of 3 L of solvent mixture of PMA was passed through the column at 2 BV / hr for water displacement. Then, start sampling at a flow rate of 4BV / hour, changing the flow rate.

example 3

[0074] Example 3 – for DOWANOL TM DOWEX with Example 1 of PMA TM MAC-3 and AMBERLITE TM IRA98's stoichiometric mixed resin bed

[0075] In this Example 3, 31 mL of hydrated wet DOWEX TM MAC-3 and 89mL Hydration Wet AMBERLITE TM IRA98 mixed. The mixed resin was placed in a vacuum oven at 60° C. and 20 mmHg for a period of 15 hours to prepare a dry resin. The dried resin was packed into a Teflon column. Will DOWANOL TM PMA solvent was flowed through the column at a rate of 8 mL / min for 8 hours. Then, start sampling at a flow rate of 4BV / hour, changing the flow rate.

[0076] Table IV - Comparative Examples

[0077]

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PUM

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Abstract

A method for purifying (i) a hydrophilic organic solvent, (ii) a hydrolysable organic solvent, or (iii) a mixture of a hydrophilic organic solvent and a hydrolysable organic solvent by removing ionic contaminants from the hydrophilic organic solvent, from the hydrolysable organic solvent, or from the mixture of a hydrophilic and a hydrolysable organic solvent without generation of by-product impurities, includes the steps of contacting the hydrophilic organic solvent, the hydrolysable organic solvent, or the mixture of hydrophilic and hydrolysable organic solvents with a mixed bed of ion exchange resin; wherein the mixed bed of ion exchange resin includes a mixture of: (a) a weak-acid cationic ion exchange resin and (b) a weak-base anionic ion exchange resin.

Description

technical field [0001] The present invention relates to a method for purifying organic solvents by removing contaminants from them; and more particularly, the present invention relates to a process for purifying organic solvents from hydrophilic organic solvents, A method for removing metal ion contaminants and non-metal ion contaminants from mixtures of organic solvents and hydrolyzable organic solvents. Background technique [0002] Pure solvents (i.e., solvents free of ionic contaminants) are often required for many industrial purposes, such as for the manufacture of pharmaceuticals and electronic materials. For example, organic solvent semiconductor fabrication processes with extremely low levels of metal ion contamination are required because metal ion contamination can negatively affect the performance and yield of fabricated semiconductor devices. Some hydrophilic organic solvents such as propylene glycol methyl ether (PGME) and hydrolyzable solvents such as propylen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/07B01J39/05B01J39/07B01J39/18B01J41/12B01J47/04C07C67/56C07C69/14
CPCB01J47/04C07C67/56C07C41/36C07C43/13C07C69/14B01J39/07B01J41/07
Inventor 蒋奇大场薫
Owner DOW GLOBAL TECH LLC
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