PROCESS FOR THE PREPARATION OF METHANOL AND METHANOL-DERIVED PRODUCTS FROM CARBON OXIDES

摘要

A process for the preparation of methanol having the process a carbon oxides per-pass conversion equal to or higher than 65%, and a selectivity to methanol formation equal to or higher than 75% by submitting carbon dioxide, carbon monoxide or a mixture of carbon monoxide and carbon dioxide to a hydrogenation reaction using a specific metal compound and specific reaction conditions of temperature, pressure, space velocity and a specific range of molar ratio of hydrogen to carbon dioxide, of hydrogen to carbon monoxide, or of hydrogen to the mixture of carbon monoxide and carbon dioxide. It further relates to a process for converting the methanol obtained into dimethyl ether or into a mixture of (C2-C8)alkene and (C1-C8)alkane.

主权项

1. A process for the preparation of methanol, with a carbon oxides per-pass conversion equal to or higher than 65%, and selectivity to methanol formation equal to or higher than 75%, comprising reacting hydrogen with carbon dioxide, carbon monoxide or mixtures thereof; at a pressure equal to or higher than 200 bar; at a temperature comprised of from 230 to 320° C.; and at a space velocity comprised of from 5.000 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 a compound of formula AnOm; or alternatively, in the presence of a mixture (III) comprising M1 and at least a compound of formula AnOm,
wherein: 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 higher 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.