I&EC 72 |
| p-Aminophenol (PAP), also known as 4-aminophenol , is an important medicine, rubber and dye intermediate with wide uses and optimum application prospects. It is manufactured through several chemical methods. An alternative method is the electrolytic method, which has mild reaction conditions, high product purity and reduced waste. In this study, using Nafion 427 cation-exchange membrane as membrane, Monel alloy as cathode and Pb-Sb alloy as anode, the technology conditions for synthesizing PAP were investigated in a self-made plate and frame electrolyzer. The optimum technological conditions were that current density 500 A.m-2, reaction temperature 185 F, catholyte sulfuric acid concentration 20% (mass fraction, the same below), nitrobenzene apparent concentration 6.75%, emulsifying agent content in catholyte 0.12%, electric quantity 100 A.h. Using the optimum technological conditions, parallel test results showed that the mean current efficiency was over 78% and the mean yield of PAP was 80% or more, which were higher than the reported values in some references. |
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IEC Poster Session
8:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Industrial & Engineering Chemistry |