Riedl Pfleiderer process

Later, development by Riedl and Pfleiderer with BASF led to the replacement of hydrazobenzenes with alkylated anthrahydroquinones [5]. The first plants employing the Riedl-Pfleiderer process - the technological basis for all modern AO processes [6] - were developed by BASF between 1935 and 1945 but dismantled at the conclusion of World War II. 

A major environmental drawback in the use of as a selective oxidant comes from its industrial production in processes such as the anthra-quinone oxidation (AO)/ Riedl-Pfleiderer process, which is currently the dominant production method [136]. The AO process involves sequential... 

This process is known as the Riedl-Pfleiderer process, having been first discovered by them in 1936. The overall equation for the process is deceptively simple ... 

Hydrogen peroxide, which is produced worldwide in quantities of 800,000 tpa is manufactured by wet-chemical processes based on barium peroxide, electrochemical processes and organic autoxidation processes. Hydrogen peroxide production by autoxidation was developed to industrial viability by BASF in the 1930 s, in the form of the hydrazobenzene process. The hydrazobenzene process, however, was characterized by the disadvantage that sodium amalgam had to be used to reduce azobenzene to hydrazobenzene. Georg Pfleiderer and Hans-Joachim Riedl then used alkylated anthraquinones in place of azobenzene. The first plant to use this process to produce H2O2 was started in Memphis, Tenn. by Du Pont in 1953. 

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