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US 12,157,672 B2Granted
Method for recycling supercritical waste liquid generated during process of producing silica aerogel blanket
AssigneeLG Chem, Ltd.
InventorsMi Ri Kim, Myung Eun Oh, Kyoung Shil Oh, Je Kyun Lee
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Abstract
Provided is a method for recycling supercritical waste liquid and a method for producing a silica aerogel blanket capable of reducing the production costs and preventing the deterioration in thermal insulation performance of a silica aerogel blanket, the method including adding sulfuric acid to supercritical waste liquid to remove ammonium ions in the form of ammonium sulfate salt, the ammonium ions which are present in the supercritical waste liquid, and reusing supercritical waste liquid from which the ammonium ions are removed.
Claims19
A method for recycling supercritical waste liquid, comprising:
- adding sulfuric acid to a supercritical waste liquid generated in a supercritical drying step during a process of producing a silica aerogel blanket, wherein the supercritical waste liquid comprises ammonium ions (NH4+);
- precipitating and removing an insoluble salt produced by adding the sulfuric acid to yield a recycled supercritical waste liquid;
- and
- using the recycled supercritical waste liquid to replace at least a portion of an organic solvent in one or more steps in the process of producing a silica aerogel blanket.
1 more element
Dependencies are inferred from the claim text.