Supercritical drying method for silica wet gel blanket
AssigneeLG Chem, Ltd.
InventorsKyoung Shil Oh, Se Won Baek
Life of this patent
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Abstract
Provided is a supercritical drying method of a silica wet gel blanket and a method for producing a silica aerogel blanket including the same, the supercritical drying method preventing a salt from being accumulated inside equipment during supercritical drying. By preventing a salt from being accumulated inside equipment during supercritical drying, it is possible to improve the operational stability of the supercritical drying process. In addition, since only a line filter needs to be separated and is easily washed, the time required for washing and the total amount of ammonia wastewater generated therefrom can be reduced, thereby improving efficiency and reducing costs.
Claims7
A supercritical drying method for a silica wet gel blanket, the method comprising:
- a) placing the silica wet gel blanket inside a supercritical extractor;
- b) subjecting the silica wet gel blanket to supercritical drying and discharging residual materials from the supercritical extractor;
- and
- c) injecting the residual materials into a line filter having an outer surface temperature in a range of 0° C.-50° C. installed between the supercritical extractor and a pressure control valve to form a filtered residual material, and then discharging the filtered residual material,
- wherein the step b) and the step c) are sequentially or simultaneously performed, and
- the step c) is filtering a salt generated by a reaction among the residual materials inside the line filter.
Dependencies are inferred from the claim text.