Patent application number | Description | Published |
20130102809 | Methanol Carbonylation Process with Rhodium Catalyst, an Iodide Salt and a Metallic Co-Catalyst Selected from Transition Metals, Indium, Strontium, Barium, Zinc, Tin and Heteropoly Acids - A carbonylation process for making acetic acid uses a metallic co-catalyst composition effective as a rhodium stabilizer and rate promoter at molar ratios of metal/rhodium of from about 0.5 to 30. A preferred process includes: (a) reacting methanol with a carbon monoxide feedstock in a rhodium-based catalytic reaction mixture having: (i) a rhodium catalyst metal, (ii) methyl iodide maintained from about 1 to 20 weight percent, (iii) a lithium iodide co-catalyst, (iv) a metallic co-catalyst composition, (v) water maintained from 0.1 weight percent to less than 8 weight percent, (vi) methyl acetate maintained from about 0.5 to about 30 weight percent, and (vii) acetic acid; (b) flashing crude acetic acid from the reaction mixture; and (c) purifying the crude acetic acid. This process achieves stability and a STY greater than 10 mol/L/hr, with substantially less than a theoretically equivalent inorganic iodide content corresponding to the metallic co-catalyst and lithium iodide. | 04-25-2013 |
20130102810 | Methanol Carbonylation Process with Rhodium Catalyst and a Lanthanide Metal Co-Catalyst - A carbonylation process for making acetic acid using a metallic co-catalyst composition, effective as a rhodium stabilizer and/or rate promoter, at molar ratios of metal/rhodium of about 0.5 to 40. The process includes reacting methanol with carbon monoxide in the presence of a rhodium-based catalytic metal complex with about 1 to 20 weight percent methyl iodide, less than about 8 weight % water and about 0.5 to about 30 weight percent methyl acetate. The crude acetic acid is flashed and further purified. This process is stable in the absence of a lithium iodide cocatalyst, or in low concentrations of lithium iodide, with an STY greater than 10 mol/L/hr. | 04-25-2013 |
20130165688 | Methanol Carbonylation Process with Rhodium Catalyst and a Metallic Co-Catalyst Selected from Transition Metals, Zinc, Beryllium, Indium, Tin, Strontium and Barium - A carbonylation process for making acetic acid using a metallic co-catalyst composition, effective as a rhodium stabilizer and/or rate promoter, at molar ratios of metal/rhodium of about 0.5 to 40. The process includes reacting methanol with carbon monoxide in the presence of a rhodium-based catalytic metal complex with about 1 to 20 weight percent methyl iodide, less than about 8 weight % water and about 0.5 to about 30 weight percent methyl acetate. The crude acetic acid is flashed and further purified. | 06-27-2013 |