Toray Industries, Inc.

Katsunosuke Maeda

Masaru Kurihara

Hiroyuki Yamamura

Yukihiro Murakami

Shigeomi Murakami

This invention relates to an apparatus and method for a multistage reverse osmosis separation which comprises reverse osmosis membrane module units arranged at multistage with a booster pump provided in the concentrate flow channel between reverse osmosis membrane module unit, wherein the total effective reverse osmosis membrane area of a module unit is in the range of 20-80% of that of the preceding module unit. The object of this invention is to provide apparatus and separation method that produce low-concentration solution from high-concentration solution with a high recovery ratio, small energy requirements, and high stability.

Apparatus and method for multistage reverse osmosis separation

A vertical carbonizing furnace for use in the production of carbon fibers is provided with a vertically extending conduit of hollow rectangular parallelepiped. The lower end of the conduit is immersed in water thereby making a water seal from environmental air. The conduit is also provided with a gas withdrawal outlet which communicates with the upper portion of the conduit through a gas feeding duct for reuse. The mixture of a vapor evaporated from the water seal and an inert gas is withdrawn from the gas withdrawal outlet and fed to the upper portion of the conduit as gas for sealing thereby preventing fibers and the conduit made of carbon or graphite from being deteriorated by said vapor evaporated from the water seal and providing a gas for sealing the upper end of the conduit.

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Tokyo, Japan

Katsunosuke Maeda