Process for changing the water content of water-absorbing or wat

Details Process for changing the water content of water-absorbing or wat Process for changing the water content of water-absorbing or wat

1981-10-16

1984-06-12

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

Means to remove liquid from treated material by contact with...

210767, 252194, 426410, 428451, 428522, F26B 500

Patent

active

044533209

ABSTRACT:
The water content of a material, which tends to either absorb water or to release water, is changed with the aid of a film, which at least partially separates the material from the adjacent space and is impermeable to liquid water but permeable to gaseous water. Polyvinyl alcohol with a particular degree of polymerization and degree of hydrolysis is used as the film material. The film can be mechanically or chemically after-treated. The moistening or de-moistening of the material, which is solid, liquid or gaseous, is effected, utilizing a water vapor pressure gradient, under very mild conditions.

REFERENCES:
patent: 3523568 (1970-08-01), van Leeuwen
patent: 4082854 (1978-04-01), Yamada et al.
patent: 4191805 (1980-03-01), Nolte
patent: 4323492 (1982-04-01), Zimmermann et al.

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