Method for producing silica aerogel blanket by reusing supercritical waste liquid
AssigneeLG Chem, Ltd.
InventorsKyoung Shil Oh, Je Kyun Lee
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Abstract
Provided is a method for producing a silica aerogel blanket, the method comprising recovering and reusing a supercritical waste liquid generated after a supercritical drying process. Without putting in additional equipment investments or energy, supercritical waste liquid recovered after a supercritical drying process can be reused by lowering the content of ammonium ions (NH4+) present therein through a simple adjustment of the conditions for the supercritical drying process. Thus, it is possible to produce a silica aerogel blanket while reducing the production costs thereof and preventing the deterioration of thermal insulation performance of the silica aerogel blanket.
Claims13
A method for producing a silica aerogel blanket, the method comprising:
- performing supercritical drying by setting an injection temperature of CO2 which is injected into an extractor containing silica wet gel to 0-30° C., wherein an injection pressure of CO2 is 60-70 bar;
- recovering a supercritical waste liquid after the supercritical drying, wherein ammonium ions present in the recovered supercritical waste liquid is 200 mg/kg or less;
- and
- reusing the recovered supercritical waste liquid in one or more steps selected from the group consisting of gelation catalyst solution preparation, aging, and surface modification, wherein an amount of the recovered supercritical waste liquid to be reused is 70-95 wt % based on a total weight of an organic solvent used in producing the silica aerogel blanket.
Dependencies are inferred from the claim text.