Heteropolyacid catalysts in the preparation of esters of unsatur

Details Heteropolyacid catalysts in the preparation of esters of unsatur Heteropolyacid catalysts in the preparation of esters of unsatur

1993-12-22

1998-10-27

MacMillan, Keith D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560217, 560247, 252432, 252437, 252439, 252469, 252470, 252467, C07C 6704, B01J 2102

Patent

active

058279393

ABSTRACT:
Use of at least one heteropolyacid H.sub.n A.sub.a D.sub.c O.sub.y.xH.sub.2 O where A is phosphorus, boron, silicon, germanium, tin, arsenic, antimony, copper, nickel, cobalt, iron, cerium, thorium, chromium and mixtures thereof; D is molybdenum, tungsten, vanadium and combinations thereof; a is 0.1-10; c is 6-18; n is the number of acidic hydrogens in the heteropolyacid and is a number above 1; y is the number of oxygens in the heteropolyacid and is a number of 10-70; and x is the number of moles of water of crystal-lisation and is a number of 0-40, as catalyst in the preparation of esters of unsaturated carboxylic acids by direct esterification of acids with alcohols or by transesterification, these reactions being carried out in the liquid phase.

REFERENCES:
patent: 3442934 (1969-05-01), Pine
patent: 3442935 (1969-05-01), Pine
patent: 4205182 (1980-05-01), Izumi et al.
Kulikov et al, "Acidic properties of Heteropolyacids and the mechanism of their catalytic action in homogeneus acid-type reactions", Mekh. Katal. Reakts., 3.sup.rd vol. 2, 13-16. 1982 ((Russian Language) abstract-only included here.).
Chemical Abstracts, vol. 9, No. 6, issued 1982 (Columbus, Ohio, USA), S. M. Kulikov et al., "Acidic Properties of heteropolyacids . . . ", the abstract No. 44047u, Mekh. Katal. Reakts., Mater. Uses, Konf., 3.sup.rd, vol. 2, 13-16. (Russ.).
Kulikov et al, "Acidic Properties of heteropolyacids and the mechanism for their catalytic Acition in homogeneous-acid-type RKNS", Mekh. Katal. Reakts., Mater. Uses. Konp., 3.sup.rd, vol. 2, 13-16., 1982.

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