Process for continuous oxidation

a technology of oxidation and process, applied in chemical/physical/physical-chemical processes, chemical compound preparations, organic chemistry, etc., can solve the problems of pressure drop due to fittings such as perforated plates, pressure drop due to perforated plates, and uneconomical technical complexity

Inactive Publication Date: 2002-05-30
DEGUSSA AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the anthraquinone process this oxidation was initially performed cocurrently in gas distribution towers connected in series using fresh air in each tower, which was both technically complicated and uneconomic.
Although the oxidation rate could be increased in a cocurrent flow of air and working solution according to U.S. Pat. No. 3,073,680 whilst retaining specific bubble sizes, obtainable by means of fine-pore gas distributor organs and specific cross-sectional loads, problems arose with the removal of the resulting foam and with the gas-liquid phase separation.
The disadvantage of this type of countercurrent flow is a very low flooding limit in the column, which means that several colu

Method used

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  • Process for continuous oxidation
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Embodiment Construction

[0012] The process according to the invention can preferably be performed in such a way that the gas bubbles generated in the mixing organ have a maximum diameter of 2.5 mm, particularly preferably of less than 1.5 mm, in order to permit a rapid transfer to the liquid phase.

[0013] Examples of possible mixing organs with which this size of gas bubble can be achieved include perforated plates, diffuser stones, static mixers or nozzles.

[0014] A Venturi nozzle is particularly suitable for the process according to the invention. This known device has a lower pressure drop in comparison to other mixing organs. Depending on the energy supplied and the volumetric flow rate, the nominal width of the channel is set in such a way that the maximum gas bubble diameter does not exceed 2.5 mm.

[0015] The mixing organ is preferably positioned in such a way that the preoxidized substance can pass from the oxidation reactor to the mixing organ by natural circulation. The mixing organ can be fitted dir...

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Abstract

A continuous process for oxidation, in which the substance to be oxidized and the oxidizing gas flow countercurrently and the oxidizing gas is mixed with a split stream containing preoxidized substance before it enters the reactor. A Venturi nozzle is particularly suitable as the mixing organ in the reactor.

Description

INTRODUCTION AND BACKGROUND[0001] The present invention concerns a continuous process for oxidation. This process is particularly suitable for the oxidation step in the anthraquinone process for production of hydrogen peroxide, in which substituted anthrahydroquinones are oxidized by oxidation with an oxygen-containing gas to form substituted anthraquinones and hydrogen peroxide.[0002] In the anthraquinone process this oxidation was initially performed cocurrently in gas distribution towers connected in series using fresh air in each tower, which was both technically complicated and uneconomic. Although the oxidation rate could be increased in a cocurrent flow of air and working solution according to U.S. Pat. No. 3,073,680 whilst retaining specific bubble sizes, obtainable by means of fine-pore gas distributor organs and specific cross-sectional loads, problems arose with the removal of the resulting foam and with the gas-liquid phase separation.[0003] U.S. Pat. No. 2,902,347 descr...

Claims

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Application Information

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IPC IPC(8): B01J4/04B01J10/00B01J19/24B01J19/26C01B15/023
CPCB01J4/04B01J10/002B01J19/2465B01J19/26C01B15/023B01J2219/00096B01J2219/185B01J2219/1943B01J2219/00033
Inventor MAURER, BERNHARD
Owner DEGUSSA AG
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