Process control for acetic acid manufacture

A technology of acetic acid and propionic acid, applied in chemical/physical/physicochemical processes, chemical/physical processes, control/regulation processes, etc.

Inactive Publication Date: 2006-03-08
MILLENNIUM PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use concentration measurements to make adjustments to the process

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
Comparison scheme
Effect test

Embodiment 1

[0108] In this example, the decanter heavy liquid phase solution return line 310 is connected to a 0.5 mm transmission cell equipped with selenite apertures, ie the heavy liquid phase 42 is continuously monitored by extended mid-infrared region analysis. The transmission cell is placed in the cell chamber of an FTIR (Fourier Transform Infrared Spectroscopy) spectrometer equipped with a DTGS detector. The decanter solution having the composition shown in the first data column of Table 7 was circulated for about 18 minutes while Figure 6 The online data points shown are recorded approximately every 35 seconds. The trend line over the 18 minute period shows that the measurement accuracy is better than + / - 0.06 molar for all components. At this point MeOAc was added to the decanter. Figure 6 The trend line for shows the effect of addition of MeOAc on the composition of the heavy liquid phase as determined by IR. Sure enough, MeOAc showed a considerable increase in concentrati...

Embodiment 2

[0112] Similar to the conditions used in Example 1. The decanter heavy liquid phase solution, having the composition shown in the first data row of Table 8, was monitored for a period of 1 hour during which aliquots of the hydrocarbon solution were added at approximately 12 minute intervals. Figure 7 The trend line above shows the expected increase in hydrocarbon concentration, from about 0.25 molar to about 0.70 molar, accompanied by a decrease in the concentration of other components of the heavy liquid phase, as dilution occurs. Solution density also decreases as very light hydrocarbons (approximately 0.7 g / ml) replace heavy MeI (approximately 2.3 g / ml). The solution was manually sampled before each hydrocarbon addition and the samples were analyzed by independent analytical methods, specifically GC for concentration and density by weighing. The data in Table 8 show very close agreement between the on-line and off-line techniques and also illustrate that on-line IR is abl...

Embodiment 3

[0115] Unless otherwise specified, the conditions used in Example 1 were similar. This example demonstrates on-line monitoring of acetaldehyde concentration as it increases in the decanter heavy liquid phase. The heavy liquid phase solution was monitored for 2 hours, during which time a data point was obtained every 2 minutes. During this 2 hour period, 9 aliquots of acetaldehyde were added. Figure 8 The trend line for acetaldehyde shows an increase from an initial value of zero to about 12,000 ppm. The solution was manually sampled before each addition of acetaldehyde and samples were analyzed by GC. Due to the residual noise in the infrared data, the infrared data of each row in Table 9 was obtained by averaging the 5 infrared data points. The comparison of the infrared data with the GC value shows that the average value of the data points can reach about + / -150ppm Accuracy. This example thus demonstrates that acetaldehyde can be effectively monitored at levels typicall...

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PUM

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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 Applications [0002] This application is a continuation-in-part of U.S. Patent Application Serial No. 09 / 611,067 (filed July 6, 2000, entitled "Methods of Preparation and Process Control"), which in turn is U.S. Patent Application Serial No. 09 / 216,330, now Patent No. Continuation-in-Part 6,103,934 (filed December 18, 1998 and entitled "Methods of Preparation and Process Control"). technical field [0003] The present invention relates to methods of improving process control in the production and purification of acetic acid, and methods of producing acetic acid using the improved process control. Background technique [0004] A popular method of making acetic acid involves continuously reacting 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 iodide cocatalyst ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/12C07C53/08B01J19/12B01J19/00B01D3/00B01D3/06B01D3/42C07B61/00
CPCB01J19/128B01J19/0006B01J2208/00628B01J2219/00063B01J2219/00069B01J2219/00146B01J2219/00182B01J2219/00186B01J2219/00191B01J2219/00202B01J2219/00231C07C51/12C07C53/08
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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