The Dow Chemical Company

Other

Tag Y Moon

Ronald H Cooper

Damoder Reddy

Charles E Reineke, Deceased

The present invention relates to an improved design for a spiral wound membrane separation device. The improved module has one feed pipe separated into compartments which are connected axially to a porous spacer surrounded by a membrane envelope. A separate permeate pipe is immediately adjacent and generally in a parallel configuration to the fluid feed pipe and is in fluid communication with a different porous spacer sheet. When the porous feed membrane and pipe and spacer and permeate pipe are combined using appropriate complementary shaped spaced filling means, a spiral wound membrane separation device is obtained having two centrally located pipes. In one aspect, the membrane separation module further includes means for the addition of a countercurrent or cocurrent sweep fluid (gas) the permeate.

Counter current dual-flow spiral wound dual-pipe membrane separation

The present invention is a keyboard device for entering Japanese language text utilizing Romaji character notation and a method for entering the Romaji character notation.

Keyboard device and method for entering Japanese language text utilizing

A method for preventing surface cracking of a portland cement mortar or concrete containing a film-forming polymeric modifier, comprising applying onto a fresh, non-cured mortar or concrete surface a substantially continuous coating comprising from about 0.06 to about 1 lb/yd.sup.2 of said mortar or concrete surface of a material selected from the group consisting of polyglycerine, glycerine and mixtures thereof.

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Worthington, OH, United States of America

Tag Y Moon