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Wasterwater Treatment Applications Water Purification Applications Capsule & Cartridge Filters Degassing Modules
Degassing Modules
Multi-Layered Composite Hollow-Fiber Membrane
* Recipient of prize at 60th annual meeting of  the Society of Fiber Science and Technology, Japan in 2004
Mitsubishi Rayon was the first company in the world to commercialize a multi-layered composite hollow-fiber membrane, a membrane with a completely new structure, and one which has superior permeability to gases. This membrane features an ultra-thin non-porous membrane sandwiched between two porous membranes.
Thanks to its non-multi-porous structure, the membrane prevents permeation of most liquid at the non-pressurized side.
As the non-porous membrane is ultra-thin, it has superior performance in letting through gases.
As the non-porous membrane is sandwiched between two polyethylene porous membranes, it displays excellent damage resistance.
It is possible to remove dissolved oxygen in water to below 1ｵg/L.
The degassing mechanism of the triple-layer hollow-fiber membrane

Permeation of the gases through the non-porous membrane is driven by the differential concentration of each gas across the membrane. Dissolved gases are thus removed from the water by passing them through the ultrathin non-porous membrane. Differential gas concentrations can be effectively created by placing one side of the membrane under a vacuum. The non-porous membrane allows only gas molecules to pass through by means of a diffusion mechanism.
Degassing system Example of treatment flow
Features of the degassing process using our multi-layered composite hollow-fiber membrane
Because of the extremely large membrane  area, operation is very efficient. Additionally, the module is very compact.
A number of modules can be fitted in line, enabling successive treatment.
Water system Usage Function Effect
Ultra-pure water for cleaning LSI chips and LCDs Removal of dissolved oxygen Prevention of formation of oxide layer
Removal of dissolved carbon dioxide Load reduction for polisher
Carbon dioxide dissolution Adjustment of electric conductivity
Feed water, air-conditioning water Removal of dissolved oxygen Prevention of pipe corrosion
Water used in food processing Removal of dissolved air Inprovement of volume uniformity in container filling process, prevention of deterioration caused by oxidization of components
Water for ultrasonic cleaning Removal of dissolved oxygen Prevention of rust in metal components
Removal of dissolved air Enhancement and homogenization of sonic cleansing action
Water used in analyzing apparatus Defoaming Improvement of accuracy of microanalysis
Solvents system Solution for semiconductor production,
Ink		 Removal of microbubbles
Removal of dissolved oxygan		 Prevention of pattern defects
Improvement of print accuracy
product information
Water degassing module(integrates-housing type)
Easy to use by all-in-one type module
MHF0504MBFT/1704/3504 flux 0.5L/min ··········· 20M0060A (MHF0504MBFT)
flux 8-12L/min ··········· 20M1500A (MHF1704)
flux 24-32L/min ··········· 20M3400A (MHF3504)
Water degassing module (cartridge type)
Excangeable and low-cost
MHF304KMD/EED flux 2-3L/min ··········· 20E0240A3 (MHF304KMD)
20E0240A1 (MHF304EEDF)
flux 8-12L/min ··········· 20E0240A3(3cartrdeges serially)
20E0240A1(3cartrdeges serially)
Degassing modules for solvents and other liquid chemicals
MHF398MDEST Excellent chemical resistance
Case examples
Water degassing module(integrated-housing type) Water degassing module(integrated-housing type)
Degassing for Japanese sake
Sample : Japanese sake
Objective : oxgen degassing for keeping quality
module : 20M3400A(MHF3504)
Photograph : Dewazakura Sake Brewery Co.,Ltd
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(c) Copyright 2004 Mitsubishi Rayon Co.,Ltd