Procedure for the preparation of methanol and products derived from methanol from carbon oxides

摘要

Process for the preparation of methanol, with a conversion per pass of carbon oxides equal to or greater than 65%, and a selectivity for the formation of methanol equal to or greater than 75%, which comprises reacting hydrogen with carbon dioxide, monoxide carbon or mixtures thereof; at a pressure equal to or greater than 200 bar; at a temperature comprised from 230 to 320 ° C; and at a space velocity comprised from 5000 to 200 000 h-1 in the presence of a mixture (I) comprising M1 and M2 or, alternatively, in the presence of a mixture (II) comprising M1, M2 and at least one compound of formula AnOm, in which: the molar ratio of hydrogen to carbon dioxide, the molar ratio of hydrogen to the mixture of carbon dioxide and carbon monoxide, or the molar ratio of hydrogen to carbon monoxide is equal to or greater than 3: 1; M1 is Cu, CuO, Cu2O or a mixture thereof; M2 is Zn, ZnO or a mixture thereof; A is a cation selected from the group consisting of Mg2 +, Al3 +, Si2 +, Si4 +, Ti3 +, Ti4 +, V2 +, V3 +, V4 +, V5 +, Cr2 +, Cr3 +, Cr6 +, Zr4 +, Mn2 +, Mn3 +, Mn4 +, Mn6 +, La3 +, Ce3 + , Ce4 +, and Th4 +; and n is an integer selected from 1 to 3; m is an integer selected from 1 to 9; being the sum of positive charges of An equal to the sum of negative charges of Om.