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Optimized liquid-phase oxidation

An oxidation reactor and xylene technology, applied in the direction of preparation of organic compounds, organic chemistry, chemical instruments and methods, etc., can solve expensive problems

Active Publication Date: 2007-08-01
GRUPO PETROTEMEX DE C V
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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

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Embodiment Construction

[0294] Examples 1-4 relate to the formation of terephthalic acid through the pilot scale oxidation of p-xylene in a pilot scale system assembled in a mechanically agitated 2 gallon tank with a hot oil jacket. Around the titanium reaction vessel. The gas dispersive stirrer in the reaction vessel was rotated at about 1500 revolutions per minute (rpm), and the power draw of the stirrer was about 220 watts. The pilot scale system is equipped with means to control the pressure and temperature within the reaction vessel and means to control the gas and liquid flow rates into the reaction vessel. The para-xylene feed was provided via a syringe pump at an effective steady state rate of approximately 0.28 kg / hr. The catalyst feed solution was pumped from the catalyst feed tank to the reaction vessel at an effective steady state rate of approximately 3.2 kg / hour. Both the para-xylene and the catalyst feed solution were released into the reaction medium through a dip tube whose end was...

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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 para-xylene 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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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/235C07C63/26
CPCC07C51/265C07C51/487C07C63/26
Inventor A·G·万德斯G·G·拉瓦C·E·小萨姆纳
Owner GRUPO PETROTEMEX DE C V
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