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Ultrafiltration membranes and methods of making and use of ultrafiltration membranes

a technology of ultrafiltration membrane and ultrafiltration membrane, which is applied in the direction of membranes, filtration separation, separation processes, etc., can solve the problems of significant error in determining the total filtration area required, and the challenge of developing a membrane product with this desired combination of properties

Inactive Publication Date: 2007-04-19
MILLIPORE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021] The present invention provides a process for adhesion of hydrophilic polymers that provides for a substantially uniform layer on the pore walls, and that thickness controlled by the thermodynamics of adhesion, rather that the stochastic nature of polymerization. The initial driving force for adhesion between a hydrophilic polymer and a hydrophobic surface is strong, but is greatly reduced after the first layer is formed, because the polymer on the surface has reduced amount of solvent associated with it, and soluble polymers do not have a thermodynamic driving force to remove solvent to adhere to such polymer. This tends to limit the layer of the hydrophilic polymer and give a substantially uniform coating on the pore walls, thus minimizing flow restriction.
[0025] The invention further embodies the use of the membranes of the present invention in a process to remove viral particles from a protein-containing solution, wherein the membrane is capable of substantially preventing the passage therethrough of virus particles and substantially permitting the passage therethrough of the protein.

Problems solved by technology

Practitioners in the field of membrane development have found that to develop a membrane product with this desired combination of properties is indeed a challenge.
Ignoring the flow-time term can result in significant error in determining total filtration area required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] A two layer polyethersulfone substrate membrane was made by cocasting two solutions of polyethersulfone in N-methyl pyrrolidone followed by contacting the two layers with water to form an ultrafiltration layer and a microfiltration layer. The substrate membrane had an LRV of 4.0 for PhiX174 and water flux of 80 L / m2 h-psi. The substrate membrane was immersed in an aqueous solution containing 1% of hydroxypropyl cellulose and 20% isopropyl alcohol at room temperature. The membrane was soaked in this solution for 30 min, removed from solution and rinsed with deionized water for 5 min with gentle agitation. It was then placed in boiling water for 10 min and dried at room temperature. The membrane had a Critical Water Surface Tension (CWST) of 77 dynes / cm. Membrane flux was recorded to be 33.3 L / m2 h-psi by measuring flow of Difko FA phosphate buffer solution (150 mM NaCl, pH 7.2) at 30 psi constant pressure. The throughput was 2152 L / m2 as measured with1.45 g / L solution of BSA (...

example 2

[0051] A two layer polyethersulfone virus-retentive substrate membrane was made by cocasting two solutions of polyethersulfone in N-methyl pyrrolidone followed by contacting the two layers with water to form an ultrafiltration layer and a microfiltration layer. The substrate membrane had an LRV of 4.0 for PhiX174 and water flux of 80 L / m2 h-psi. The substrate membrane was immersed in an aqueous solution containing 0.5% of hydroxypropyl cellulose, 20% isopropyl alcohol, and 0.023% surfactant Zonyl FSN (DuPont, Bridgeport, Conn.) at room temperature. The membrane was soaked in this solution for 2 min, removed from solution, excess solution was nipped off and the membrane was heated at 120 deg. C for 15 min. Membrane flux was recorded to be 41.8 L / m2 h-psi and the throughput was 1608 L / m2.

example 3

[0052] The procedure described in Example 2 was followed. The membrane was immersed in boiling water for 5 minutes.

[0053] Table 1. Membrane flux as recorded by measuring flow of Difko FA phosphate buffer solution (150 mM NaCl, pH 7.2) at 30 psi constant pressure and throughput as measured with1.45 g / L solution of BSA (Serologicals, Inc., Temecula, Calif.) in the same Difko FA phosphate buffer solution that was filtered through the membrane at constant pressure of 30 psi. A was calculated by Equation 2 set forth above.

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Abstract

An inherently hydrophobic polymer membrane substrate having its surface rendered hydrophilic with a hydroxyalkyl cellulose and having a throughput greater than about 1500 L / m2 is provided. A process for making the membrane also is provided which includes a step of autoclaving in boiling water and / or steam or submerging in boiling water. The membrane is useful for removing virus from a protein solution.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] The present patent application is related to U.S. Provisional Patent Application No. 60 / 726,745, filed on Oct. 14, 2005 which is hereby incorporated by reference in its entirety.[0002] This invention relates to membranes having at least one ultrafiltration layer, to a novel method of manufacturing such membranes and to the use of the membranes. More particularly, this invention relates to ultrafiltration membranes having a modified hydrophilic surface, their method of making and their use to remove viruses from a biomolecular solution. BACKGROUND [0003] Ultrafiltration and microporous membranes are used in pressure-driven filtration processes. Practitioners in the field of separation processes by membranes easily differentiate between microporous and ultrafiltration membranes and generally distinguish between them based on their application and aspects of their structure. Microporous and ultrafiltration membranes are made, sold and used ...

Claims

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Application Information

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IPC IPC(8): B01D71/10
CPCA61L2/0017B01D67/0083B01D67/0088B01D67/0093B01D69/02B01D71/68B01D2323/02B01D2325/20B01D2325/36B01D69/10B01D69/107
Inventor MOYA, WILSONKOZLOV, MIKHAIL
Owner MILLIPORE CORP
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