Patent ID: 11891306
Assignee: LG CHEM, LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC C

Claim 0:
1. 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.