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Optimized liquid-phase oxidation

A liquid phase, compound technology, applied in organic oxidation, preparation of organic compounds, organic chemistry, etc., can solve problems such as expensive

Active Publication Date: 2007-08-22
GRUPO PETROTEMEX SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While effective, such traditional purification methods can be very expensive

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0347] Example 1 is a calculated example of a bubble column oxidation reactor for the oxidation of para-xylene in the liquid phase of a three-phase reaction medium. The bubble column reactor of Example 1 represents a proven commercial design with a para-xylene feed rate of 7000 kg per hour. Examples 2 to 10 are calculation examples of bubble column oxidation reactors whose operating capacity is 7 times larger than that of the reactor in Example 1. Figure 58 provides a table of various parameters of the modified bubble column oxidation reactor in Examples 1-10.

[0348] Example 1

[0349] This example utilizes a bubble column reaction vessel having a vertical, cylindrical section with an inner diameter equal to 2.44 m. The height of the cylindrical section is 32 m from the lower tangent (TL) to the upper TL of the cylindrical section. The vessel is fitted with 2:1 oval heads on the top and bottom of the cylindrical section. The height from the bottom of the reaction medium ...

Embodiment 2

[0355] In this example, the bubble column reactor was fed with para-xylene at an elevated rate of 49,000 kg per hour—7 times the rate in Example 1. The superficial gas velocity (often considered an important scaling variable for bubble columns) was kept approximately equal to Example 1 by increasing the cross-sectional area of ​​the reaction vessel to about 7 times that in Example 1. The H:W and L:D ratios (often considered important scaling variables for bubble columns) were also kept approximately equal to Example 1.

[0356] The other feed streams were increased by the same ratio as for Example 1 of 7:1. The feed composition was the same as in Example 1, and the same concentrations of water, cobalt, bromine and manganese as in Example 1 were provided within the liquid phase of the reaction medium. The operating pressure of the reaction vessel overhead gas was also 0.52 MPa gauge, and the operating temperature near the middle height of the reaction medium was also about 160...

Embodiment 3

[0362] This example scales up the method of Example 1 using superficial velocities and space-time reaction strengths. This results in poor product quality, in short, because the natural convection mode inherently produces a poor reaction profile vertically.

[0363] In this example, the para-xylene feed rate was also 49000 kg per hour - 7 times the feed rate in Example 1. The superficial gas velocity also remains approximately equal to Example 1, but the L:D and H:W ratios do not remain equal. Instead, STR remained approximately equal to Example 1. This provides approximately equal values ​​for column bottoms pressure and acetic acid decomposition ratio of Example 1. The other feed streams were increased by the same ratio as for Example 1 of 7:1. The feed composition was the same as in Example 1, and the same concentrations of water, cobalt, bromine and manganese as in Example 1 were provided within the liquid phase of the reaction medium. The operating pressure of the rea...

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PUM

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Abstract

Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low temperatures. When the oxidized compound is paraxylene and the product from the oxidation reaction is crude terephthalic acid (CTA), such CTA product can be purified and separated by more economical techniques than could be employed if the CTA were formed by a conventional high-temperature oxidation process.

Description

field of invention [0001] The present invention generally relates to a process for the liquid phase catalytic oxidation of aromatic compounds. One aspect of the present invention relates to the partial oxidation of a dialkylaromatic compound (e.g., p-xylene) to produce a crude aromatic dicarboxylic acid (e.g., crude terephthalic acid), which can then be for purification and isolation. Another aspect of the invention relates to an improved bubble column reactor that provides a more efficient and economical liquid phase oxidation process. Background of the invention [0002] Liquid phase oxidation reactions are employed in various existing commercial processes. For example, liquid phase oxidation is currently frequently used for the oxidation of aldehydes to acids (eg, propionaldehyde to propionic acid), cyclohexane to adipic acid, and alkylaromatics to alcohols, acids, or diacids. A particularly important commercial oxidation process in the latter category (oxidation of al...

Claims

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Application Information

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IPC IPC(8): B01J19/24C07B33/00B01J10/00C07C51/235
Inventor M・德弗里德A・G・万德斯林鑫
Owner GRUPO PETROTEMEX SA
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