Method and apparatus for drying wet porous bodies under subcriti

Details Method and apparatus for drying wet porous bodies under subcriti Method and apparatus for drying wet porous bodies under subcriti

1997-08-19

1999-03-02

Bennett, Henry A.

Drying and gas or vapor contact with solids

Process

Congealing or thickening

34331, 34343, F26B 506

Patent

active

058755640

ABSTRACT:
An improved apparatus, and related method of operation, is described for rapidly drying large monoliths of glass, ceramic and/or composite material, under subcritical conditions, while minimizing the risk of cracking the monolith during the drying process. The apparatus incorporates a pressure chamber for carrying the monolith to be dried, with no significant limitation on the size of the monolith relative to the size of the chamber. The monolith is initially immersed in a suitable drying solvent, and the temperature of the pressure chamber is raised to a predetermined value below the solvent's critical temperature, which raises the pressure to a predetermined value, likewise below the solvent's critical pressure. At a selected time during the drying process the pressure chamber is connected to a diffusion chamber, to draw away and condense solvent vapor. This drawing away of solvent vapor continues until the monolith is dry, at which time the pressure chamber is purged with an inert gas and then depressurized in a controlled manner. The apparatus thereby is configured to dry the monolith at an even lower subcritical pressure than previous apparatus of this kind, leading to increased safety and reduced operating expenses.

REFERENCES:
patent: 5023208 (1991-06-01), Pope et al.
patent: 5243769 (1993-09-01), Wang et al.
patent: 5343633 (1994-09-01), Wang et al.
patent: 5473826 (1995-12-01), Kirkbir et al.

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