Quinones as corrosion inhibitor in distilling alkanoic acids

Details Quinones as corrosion inhibitor in distilling alkanoic acids Quinones as corrosion inhibitor in distilling alkanoic acids

1974-06-17

1976-06-01

Ribando, Curtis P.

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

For scale inhibiting or corrosion preventing

203 57, 203 86, 260540, 260541, 260542, C23F 1402

Patent

active

039606716

ABSTRACT:
A process is disclosed for distilling corrosive carboxylic acids free of olefinic unsaturation in distillation apparatus constructed of corrodible metal, which includes the steps of introducing a crude dilute solution of such a corrosive acid into the distillation zone, distilling in the presence of an effective amount of p-benzoquinone or of 1,4-naphthoquinone, and recovering the concentrated corrosive acid outside the distillation zone. The amount of p-benzoquinone or of 1,4-naphthoquinone is such as to effectively prevent or reduce to acceptable limits the corrosion of the metal distillation apparatus by such acids, and also to permit this distillation process to be effectuated at those high acid vapor temperatures which otherwise would not be feasible because of the heightened degree of corrosiveness exhibited by the acids at such temperatures.

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C. R. Noller, Chemistry of Organic Compounds, 1951, pp. 506-509.

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