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Impurity removal method in polymer compound solution

A polymer compound and solution technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane, etc., can solve problems such as uneven filtration pressure and increased pressure loss

Active Publication Date: 2017-03-08
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the series arrangement of the membrane modules will increase the pressure loss, there will be unevenness in the filtration pressure of each membrane module.

Method used

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  • Impurity removal method in polymer compound solution
  • Impurity removal method in polymer compound solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] [test methods]

[0077]

[0078] Carry out diafiltration until the cleaning ratio is 3.0 times ([total mass of filtrate] / [mass of raw material solution] becomes 3.0 times), and divide the total mass of the obtained filtrate by the required time (h) and all membrane modules The total area of ​​the membrane with (m 2 ) The amount of the filtrate per unit time unit membrane obtained as filtration rate (unit: L / m 2 h).

[0079]

[0080] The outflow rate of the polymer compound into the filtrate (hereinafter also simply referred to as "the outflow rate") was obtained by the following formula.

[0081] Outflow rate (%)=100×[total mass of high molecular compound flowing out into filtrate] / [total mass of high molecular compound contained in raw material solution]

[0082] (the total mass of the polymer compound flowing out into the filtrate)

[0083] All the filtrate that flowed out when the diafiltration was carried out until the washing ratio was 3.0 times was pooled....

Embodiment 1

[0105] The ceramic membrane Cefilt NF (Cefilt) NF (molecular weight cut-off 3000, membrane area 0.35m2) manufactured by NGK filtec was used. 2 ) to replace the ceramic membrane tubular ceramic ultrafiltration membrane (INSIDE CeRAM FineUF) manufactured by France Delta (TAMI) (the molecular weight cut-off is 1000, and the membrane area is 0.35m 2 ), except that, diafiltration was performed in the same manner as in Comparative Example 1.

[0106] The results are shown in Table 1.

Embodiment 2

[0108] The ceramic membrane tubular ceramic fine ultrafiltration membrane (INSIDE CeRAMFineUF) manufactured by France Delta (TAMI) (the molecular weight cut-off is 5000, and the membrane area is 0.35m 2 ) to replace the ceramic membrane tubular ceramic ultrafiltration membrane (INSIDE CeRAM FineUF) manufactured by France Delta (TAMI) (the molecular weight cut-off is 1000, and the membrane area is 0.35m 2 ), except that, the same method as Comparative Example 1 was used for diafiltration.

[0109] The results are shown in Table 1.

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Abstract

The present invention provides a method for removing impurities in a polymer compound solution, which is a method for removing low-molecular impurities from a solution containing a polymer compound by cross-flow membrane filtration in which two or more membrane modules are arranged in series , the method satisfies the following (A) to (C): (A) the polymer compound in the solution has a single-peak molecular weight distribution; (B) the molecular weight cut-off MWCO of the filter membrane and the number average molecular weight Mn of the polymer compound and The weight average molecular weight Mw satisfies the following (I): Mw × (Mw / Mn) - 3 < MWCO < Mw × (Mw / Mn) - 1 (I); (C) the filtration pressure between each membrane module in the membrane filtration The coefficient of variation is set to 10% or less. The method of the invention can effectively inhibit the high molecular compound from flowing out into the filtrate and can realize high filtration speed.

Description

technical field [0001] The invention relates to a method for removing low-molecular impurities from a solution containing high-molecular compounds through membrane filtration. More specifically, it relates to a method of removing low-molecular-weight impurities in a solution containing a polymer compound by cross-flow membrane filtration in which a plurality of membrane filtration modules are arranged in series. Background technique [0002] When polymerizing monomers to obtain a polymer compound, low-molecular impurities such as unreacted monomers or oligomers, polymerization solvents, and initiators exist in the reaction solution after the polymerization reaction. In addition, when a high-molecular compound is attached to a chemical reaction, low-molecular impurities such as unreacted reagents and reaction solvents also exist in the reaction solution after the chemical reaction. As a method for removing these low-molecular impurities, cross-flow membrane filtration treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/58B01D71/02C08J3/00
CPCB01D61/025B01D2315/10B01D2317/025
Inventor 松本秀树永田美彰永井洋一
Owner FUJIFILM CORP