Effect of poly(aspartic acid) on the removal rates of brushite deposits from stainless steel tubing in turbulent flow

Felicia Littlejohn, Christine S. Grant, Yu Ling Wong, Avelino E Saez

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This research investigates the effect of poly(aspartic acid) (PASP) and its sodium salt on the removal of brushite (dicalcium phosphate dihydrate, DCPD) deposits from stainless steel tubing in turbulent flows. In the absence of PASP, DCPD removal is dominated by the abrasion of solid particles from the deposit by fluid shear and is influenced by the kinetics of the interfacial dissolution process. The presence of PASP promotes DCPD removal for pHs between 4 and 10, with an optimum enhancement at pH 5. A decrease in the sensitivity of the removal rate to shear forces indicates that PASP inhibits solids detachment from the deposit for pH < 5. At higher pHs, PASP appears to reduce the shear stress required to remove particles from the deposit. A model for the interfacial dissolution process that includes mass transfer, adsorption equilibria, and the kinetics of acid dissolution and surface complexation is used to explain the trends of the experimental data on removal rates.

Original languageEnglish (US)
Pages (from-to)4576-4584
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume41
Issue number18
StatePublished - Sep 4 2002

Fingerprint

aspartic acid
Stainless Steel
Tubing
turbulent flow
Aspartic Acid
Turbulent flow
Stainless steel
steel
dissolution
Acids
Dissolution
kinetics
abrasion
Phosphates
Phosphate deposits
complexation
shear stress
mass transfer
phosphate
sodium

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

Effect of poly(aspartic acid) on the removal rates of brushite deposits from stainless steel tubing in turbulent flow. / Littlejohn, Felicia; Grant, Christine S.; Wong, Yu Ling; Saez, Avelino E.

In: Industrial and Engineering Chemistry Research, Vol. 41, No. 18, 04.09.2002, p. 4576-4584.

Research output: Contribution to journalArticle

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