	US 11,939,223 B2
	Process for the hydrophobization of porous silica
Raman Subrahmanyam, Hamburg (DE); Fynn Missfeldt, Hamburg (DE); Pavel Gurikov, Hamburg (DE); Irina Smirnova, Hamburg (DE); Sohajl Movahhed, Cologne (DE); Wibke Loelsberg, Ludwigshafen am Rhein (DE); and Paul Dieringer, Frankfurt am Main (DE)
Assigned to aerogel-it GmbH, Osnabrueck (DE)
Appl. No. 17/442,406
Filed by aerogel-it GmbH, Osnabrueck (DE)
PCT Filed Mar. 24, 2020, PCT No. PCT/EP2020/058163 § 371(c)(1), (2) Date Sep. 23, 2021, PCT Pub. No. WO2020/193554, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 19164913 (EP), filed on Mar. 25, 2019.
Prior Publication US 2022/0185682 A1, Jun. 16, 2022
Int. Cl. C01B 33/158 (2006.01); B01J 13/00 (2006.01); B01J 20/10 (2006.01); C04B 14/06 (2006.01)

CPC C01B 33/1585 (2013.01) [B01J 13/0091 (2013.01); B01J 20/103 (2013.01); C04B 14/062 (2013.01)]

10 Claims

1. A process for the hydrophobization of a porous silica-based compound, the process comprising:

(i) providing a composition (I) comprising a porous silica-based compound,

(ii) treating the composition (I) in a treatment vessel with a composition (II) comprising hexamethyldisiloxane or its hydrolyzed form, to obtain a treated porous silica-based compound, and

(iii) removing the treated porous silica-based compound from the treatment vessel,

wherein the treatment according to (ii) is carried out at a temperature in the range of from 60 to 90° C. and at a pH value in the range of from 0.5 to 3,

and wherein the porous silica-based compound is a silica-based aerogel.