Solid acid catalyst, e.g. for esterification, transesterification and acetal- or ketal-production, contains aluminum, gallium or iron and structures derived from inorganic and organic phosphorus acids

摘要

A solid acid catalyst with a with very high activity and high stability in a variety of organic reaction systems. A solid acid catalyst (I) comprising a structure (A) resulting from the removal of a hydrogen atom from at least one hydroxy group in an inorganic phosphorus acid, a structure (B) resulting from the removal of a hydrogen atom from at least one OH group in an organic phosphorus acid of formulae R1-P(=O)(R2)-OH (1) or R1-P(R2)-OH (2), and (C) at least one aluminum, gallium and/or iron atom. R2, R2 = R, OR, OH or H, with the proviso that at least one of these groups is R or OR; R = 1-22C organic group Independent claims are also included for: (i) production of esters from starting esters or acids and alcohols using catalyst (I); (ii) production of ketals or acetals from ketones or aldehydes and alcohols using catalyst (I); and (iii) production of (I).