the use of heteropolyacides as catalysts in the preparation of esters of carboxylic acids insatures (trans) - liquid phase esterification process of preparing for and

摘要

use of at least one hu00e9tu00e9ropolyacidehnaadcoy.xh2o, where a = phosphorus, boron, silicon, germanium,arsenic, antimony, tin, copper, nickel, cobalt, iron,chromium, cerium, thorium, molybdenum, and mixtures thereof; and (d) =.tungsten, vanadium and their combinations; a = 0.1 to 10.c = 6 - 18; n = number of hydrogen in the hu00e9tu00e9ropolyacid acidand a number greater than 1; y = numberin the hu00e9tu00e9ropolyacide oxygen and a number of10 / 70; and x = the number of moles of water of crystallization.is a number of 0 to 40, as a catalyst in the preparation ofesters of unsaturated carboxylic acids by esterificationthese acids by direct alcohol orif these reactions are carried out in stages.the liquid.