Journals Information
Universal Journal of Chemistry(CEASE PUBLICATION) Vol. 2(1), pp. 6 - 10
DOI: 10.13189/ujc.2014.020102
Reprint (PDF) (558Kb)
Acid Cleaning of Corrosive Kraft Digesters and Evaporators
Moses Wekesa 1, Md. Jamal Uddin 1,*, Pablo Conde 2, Preet Singh 2
1 Coppin State University, Department of Natural Sciences, Baltimore, MD, USA
2 Georgia Institute of Technology, Institute of Pulp and Paper Science & Technology, Atlanta, USA
ABSTRACT
During scheduled shut downs of Kraft evaporator and digester, acid cleaning is required to remove scales that precipitate from chemical species present in liquors. Acid cleaning can affect the base metal of the Kraft equipment leading to significant localized corrosion, which can lead to unexpected failures. Burkeite was deposited on the carbon steel coupons and the x-ray diffractometer pattern of the scale was taken. 20% sulfamic acid solution with 0.5% inhibitor B was found to be effective in scale removal at either 25℃ or 50℃.The rate of scale removal increased by either increasing the temperature or the rate of stirring (flow rate). Also changing the scale morphology was another way of enhancing its removal.
KEYWORDS
Kraft Equipment, Sulfamic Acid, Inhibitor, NH2SO3H
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Moses Wekesa , Md. Jamal Uddin , Pablo Conde , Preet Singh , "Acid Cleaning of Corrosive Kraft Digesters and Evaporators," Universal Journal of Chemistry(CEASE PUBLICATION), Vol. 2, No. 1, pp. 6 - 10, 2014. DOI: 10.13189/ujc.2014.020102.
(b). APA Format:
Moses Wekesa , Md. Jamal Uddin , Pablo Conde , Preet Singh (2014). Acid Cleaning of Corrosive Kraft Digesters and Evaporators. Universal Journal of Chemistry(CEASE PUBLICATION), 2(1), 6 - 10. DOI: 10.13189/ujc.2014.020102.