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

Inactive Publication Date: 2003-10-15
MILLENNIUM PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Use concentration measurements t

Method used

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  • Process control for acetic acid manufacture
  • Process control for acetic acid manufacture
  • Process control for acetic acid manufacture

Examples

Experimental program
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Effect test

Embodiment 1

[0109] In this embodiment, the return line 310 of the heavy liquid phase solution in the decanter is connected to a 0.5 mm transmission cell equipped with selenite window holes, that is, the heavy liquid phase 42 is continuously monitored by extended mid-infrared zone analysis. The transmission cell is placed in the cell chamber of an FTIR (Fourier Transform Infrared Spectroscopy) spectrometer equipped with a DTGS detector. Circulate the decanter solution with the composition shown in the first column of Table 7 for about 18 minutes, and at the same time Figure 6 The online data points shown are recorded approximately every 35 seconds. The trend line in 18 minutes shows that the accuracy of the measurement for all components is better than + / -0.06 moles. Add MeOAc to the decanter at this point. Figure 6 The trend line shows the effect of adding MeOAc on the composition of the heavy liquid phase as measured by infrared. Sure enough, MeOAc showed a considerable increase in concent...

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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.

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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Application Information

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IPC IPC(8): B01D3/00B01D3/06B01D3/42B01J19/00B01J19/12C07B61/00C07C51/12C07C53/08
CPCC07C51/12B01J19/0006B01J2219/00202B01J2219/00146B01J2219/00063B01J2219/00231B01J2219/00069B01J2208/00628B01J2219/00182B01J2219/00186B01J19/128B01J2219/00191C07C53/08
Inventor 诺埃尔·哈利南詹姆斯·A·欣嫩坎普亚万·谢利
Owner MILLENNIUM PETROCHEM
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