Patent application number | Description | Published |
20120283471 | Removal of Amine Compounds from Carbonylation Process Stream Containing Corrosion Metal Contaminants - A process for removing amine compounds from a process stream derived from a carbonylation process. The amine compounds may be present as iodide salts. The process stream also contains corrosion metal contaminants. The amine compounds are removed by mixing a portion of the process stream a slipstream to form an aqueous stream having a water concentration of greater than 50 wt. %. The aqueous stream is contacted with an exchange resin to remove amine compounds, as well as corrosion metal contaminants. | 11-08-2012 |
20120283472 | Removal of Aromatics from Carbonylation Process - The invention relates to processes for removing aromatics from the reactants that are fed to a carbonylation reactor. The aromatics are removed using a guard bed that comprises an adsorbent. | 11-08-2012 |
20150148562 | Removal of Aromatics from Carbonylation Process - The invention relates to processes for removing aromatics from the reactants that are fed to a carbonylation reactor. The aromatics are removed using a guard bed that comprises an adsorbent. | 05-28-2015 |
20160137574 | Reducing Hydrogen Iodide Content in Carbonylation Processes - Processes for producing acetic acid wherein at least one process vent stream is treated in an absorber column that utilizes a scrubber solvent, e.g., acetic acid, methanol, and/or methyl acetate to remove hydrogen iodide therefrom. | 05-19-2016 |
20160137575 | PROCESSES FOR PRODUCING ACETIC ACID FROM A REACTION MEDIUM HAVING LOW ETHYL IODIDE CONTENT - A process for producing high purity acetic acid from a carbonylation reaction, wherein the carbonylation reaction is carried out while maintaining a low ethyl iodide content in the reaction medium. The ethyl iodide concentration may be maintained by removing acetaldehyde from the reaction medium and/or by adjusting at least one A) hydrogen partial pressure in the reactor, B) methyl acetate concentration of the reaction medium; and/or C) methyl iodide concentration of the reaction medium. | 05-19-2016 |
20160137576 | Processes for Producing an Acetic Acid Product Having Low Butyl Acetate Content - A process for producing an acetic acid product having low butyl acetate content via a carbonylation reaction. The carbonylation reaction is carried out at a temperature from 100 to 300° C., a hydrogen partial pressure from 0.3 to 2 atm, and a rhodium catalyst concentration from 100 to 3000 wppm, based on the weight of the reaction medium. The butyl acetate concentration in the acetic acid product may be controlled by removing acetaldehyde from a stream derived from the reaction medium and/or by adjusting at least one of reaction temperature, hydrogen partial pressure, and metal catalyst concentration. | 05-19-2016 |
20160137577 | Process for Flashing A Reaction Medium Comprising Lithium Acetate - A process for producing acetic acid is disclosed, in which the methyl iodide concentration is maintained in the vapor product stream formed in a flashing step. The process includes introducing a lithium compound into the reactor and maintaining a concentration of lithium acetate in the reaction medium is in an amount from 0.3 to 0.7 wt. %. The reaction medium is fed forward to the flashing step. The methyl iodide concentration in the vapor product stream ranges from 24 to less than 36 wt. %, based on the weight of the vapor product stream. The vapor product stream is distilled in a first column to obtain an acetic acid product stream comprising acetic acid and hydrogen iodide in an amount of less than or equal to 300 wppm and/or methyl iodide in an amount from 0.1 to 6 wt. %. | 05-19-2016 |
20160137578 | PROCESSES FOR IMPROVING ACETIC ACID YIELD BY REMOVING IRON - In a process for improving a carbonylation process, iron is removed to maintain an effective Space Time Yield (STY) of the rhodium catalyst of at least 80% of the maximum STY. The process comprises carbonylating methanol in a reactor in a reaction medium comprising water, a rhodium catalyst, methyl iodide and a halide salt, separating a portion of the reaction medium in a flash vessel to form a less volatile stream and a vapor product stream comprising acetic acid, recycling a liquid stream to the reactor, wherein the liquid stream comprises a portion of the less volatile stream and wherein the liquid stream comprises iron, and removing a portion of the iron from the liquid stream to maintain an effective STY of the rhodium catalyst of at least 80% of the maximum STY. | 05-19-2016 |
20160137581 | Processes for Producing Acetic Acid With Decanter Control - A process for producing acetic acid comprising the steps of carbonylating methanol in a reaction medium to form a crude acetic acid product; conveying the crude acetic acid product to a flash vessel at a flash flow rate; flashing the crude acetic acid product to form a first vapor stream comprising acetic acid and a liquid residue stream comprising metal catalyst and halide salt; separating the flashed vapor stream to form a second vapor stream comprising methyl iodide a sidedraw comprising purified acetic acid and water, and a liquid residue stream. The process further comprises the steps of condensing at least a portion of the second vapor stream to form at least one liquid phase and refluxing to the light ends column at least a portion of the at least one liquid phase at a reflux rate. The reflux rate is adjusted based on changes in the flash flow rate. | 05-19-2016 |