Process control for acetic acid manufacture

A technology of process control and acetic acid, applied in chemical/physical/physicochemical processes, chemical/physical processes, control/regulation processes, etc. of applied energy
CN1449369AInactive Publication Date: 2003-10-15MILLENNIUM PETROCHEM
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
MILLENNIUM PETROCHEM
Publication Date
2003-10-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method of real time process control in a reaction system for the procuction of acetic acid from the carbonylation of methanol. Raction system samples are collected from columns (30, 40, 50, 60, 70, 80) and / or transfer lines (120, 130, 140, 150, 160, 170, 180, 184, 186, 188, 190, 192, 194, 196, 197, 198, 199, 200, 210, 220) downstream of a reactor vessel (10), and the concentration of one or more components in the sample is measured by an infrared analyzer (90). The concentration measurements are then used to make adjustments in the concentration of components in the reaction system, directly or indirectly, such as by adjusting the temperature profile in a particular column (30, 40, 50, 60, 70, 80), the flow rate of solution in to or out of a column (30, 40, 50, 60, 70, 80), the vent gas rate out of the reactor (10) or a column (30, 40, 50, 60, 70, 80), or the addition or extraction of a component to or from the solution. For optimum process control, the measurements are transmitted to a control unit for real time analysis, and the adjustements are made substantially instantly after the infrared analysis.
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Description

[0001] Cross-references to the application

[0002] This application is a partial continuation of US Patent Application 09 / 611,067 (filed on July 6, 2000, entitled "Preparation and Process Control Method"), which is in turn US Patent Application Serial No. 09 / 216,330, now the patent number Part of the continuation application for 6,103,934 (filed on December 18, 1998, entitled "Methods of Preparation and Process Control"). Technical field

[0003] The present invention relates to a method for improving process control in the preparation and purification of acetic acid, and a method for preparing acetic acid using improved process control. Background technique

[0004] A popular method of preparing acetic acid involves the continuous reaction of methanol and carbon monoxide in a stirred reactor. The reaction mixture contains a soluble catalyst from Group 9, specifically iridium or rhodium, and a methyl iodide / hydrogen iodid...

Claims

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