Abstract: A process for producing a bioreactor using viable immobilized biological material. The process produces a siliceous layer capable of biomass immobilization and selectively cutting off of macromolecules having a molecular weight higher than a selected threshold. The process includes the steps of: (a) supplying a gas flow of a gas carrier saturated by a mixture of silicon alkoxides selected from the group comprising (1) Si(OR)4, (2) SiH(OR)3, (3) R?Si(OR)3 and (4) R?SiH(OR)2 wherein R and R?, equal or different each other, are alkyl and/or aryl groups, wherein said gas flow is prepared by bubbling the gas carrier into a liquid mixture of said alkoxides in the ratio of (1) 40-85/(2) 0-60/(3) 0-60/(4) 0-60 (% v/v), preferably in the ratio of (1) 40-85/(2) 0-50/(3) 0-50/(4) 0-50 (% v/v), more preferably in the ratio of (1) 50-80/(2) 0-20/(3) 5-30/(4) 5-30 (% v/v), at a temperature of from 20 to 180° C., preferably of from 20 to 100° C.

Abstract: The present invention relates to a process for producing a bioreactor using viable immobilized biological material and to the bioreactor itself. More particularly, the present invention relates to a process for producing a siliceous layer capable of biomass immobilization and selectively cutting off macromolecules having a molecular weight higher than a selected threshold, comprising the steps of: a) supplying a gas flow of a gas carrier saturated by a mixture of silicon alkoxides selected from the group comprising (1)Si(OR)4, (2)SiH(OR)3, (3)R?Si(OR)3 and (4)R?SiH(OR)2 wherein R and R?, equal or different each other, are alkyl and/or aryl groups, wherein said gas flow is prepared by bubbling the gas carrier into a liquid mixture of said alkoxides in the ratio of (1)40–85/(2)0–60/(3)0–60/(4)0–60 (% v/v), preferably in the ratio of (1)40–85/(2)0–50/(3)0–50/(4)0–50 (% v/v), more preferably in the ratio of (1)50–80/(2)0–20/(3)5–30/(4)5–30 (% v/v), at a temperature of from 20 to 180° C.