Loading patent…
AssigneeCelanese International Corporation
InventorsHosea Cheung, Michael E. Huckman, G. Paull Torrence
Estimating the term…
The invention relates to a process for the production of acetic acid by carbonylation of methanol, and reactive derivatives thereof, in a reaction mixture using a rhodium-based catalyst in low water conditions. The process is used to achieve reaction rates of at least 15 g mol/l/hr. The high rate reactions proceed at water concentrations of less than 2.0 wt. %. Under certain conditions, the water concentration in the reaction mixture of the process is maintained at a desired concentration by at least one process step including adding a compound such as methyl acetate, dimethyl ether, acetic anhydride, or mixtures of these compounds to the reaction system. The process step of adding the components to the reaction mixture may be combined with other process steps for controlling water concentrations in reaction mixtures for the carbonylation of methanol.
A process far the production of acetic acid at a space-time yield of at least 15 g-mol/l/hr, by a catalytic carbonylation reaction, comprising reacting a compound selected from the group consisting of an alkyl alcohol and reactive derivatives thereof, in the presence of carbon monoxide and a rhodium-based catalyst system in a reaction mixture wherein the reaction mixture comprises less than 2.0 wt. % water, at least 1000 ppm of a metal selected from the group consisting of rhodium, and combination of rhodium and iridium, an iodide ion at a concentration in the range of about 2 to 20 wt. %, and a halogen promoter at a concentration of about 2.0 wt. % to about 30.0 wt. %.
A process for the production of acetic acid by a carbonylation reaction in a system comprising a reaction section and a purification section, comprising the steps of:
Dependencies are inferred from the claim text.