Unusually extended corrosion phenomena were detected in a distillation column, made of UNS S31803 duplex stainless steel, of a plant for the production of cellulose acetate. The process fluid was an aqueous solution of 80% acetic acid to separate by simple rectification. Corrosion was in the form of uniform attack mainly on downcomers and plates corresponding to the feedstock line. The phenomenon was a consequence of incomplete neutralization of sulphuric acid in the process fluid, used as a catalyst for the hydrolysis of esters. Controlled addition of H2O2 was proposed to solve the problem.

Corrosion of an UNS S31803 distillation column for acetic acid recovery / A. Colombo, S.P.M. Trasatti. - In: ENGINEERING FAILURE ANALYSIS. - ISSN 1350-6307. - 55(2015), pp. 317-326. [10.1016/j.engfailanal.2015.07.017]

Corrosion of an UNS S31803 distillation column for acetic acid recovery

A. Colombo;S.P.M. Trasatti
Ultimo
2015

Abstract

Unusually extended corrosion phenomena were detected in a distillation column, made of UNS S31803 duplex stainless steel, of a plant for the production of cellulose acetate. The process fluid was an aqueous solution of 80% acetic acid to separate by simple rectification. Corrosion was in the form of uniform attack mainly on downcomers and plates corresponding to the feedstock line. The phenomenon was a consequence of incomplete neutralization of sulphuric acid in the process fluid, used as a catalyst for the hydrolysis of esters. Controlled addition of H2O2 was proposed to solve the problem.
Acetic acid corrosion; Chemical-plant failure; Failure analysis; Process-plant failure; Materials Science (all); Engineering (all)
Settore ING-IND/23 - Chimica Fisica Applicata
2015
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/453961
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