Effect of Benzoic Acids on Barite and Calcite Precipitation

Autor:	Franca Jones, and Allan Oliviera, Sandra R. Freeman, William R. Richmond, Mark I. Ogden
Rok vydání:	2006
Předmět:	Calcite chemistry.chemical_classification Precipitation (chemistry) Inorganic chemistry General Chemistry Condensed Matter Physics chemistry.chemical_compound Phthalic acid chemistry Humic acid General Materials Science Mellitic acid Carboxylate Trimesic acid Benzoic acid
Zdroj:	Crystal Growth & Design. 6:2579-2587
ISSN:	1528-7505 1528-7483
DOI:	10.1021/cg060186z
Popis:	The effect of various benzoic acids on the precipitation of barite (BaSO4) and calcite (CaCO3) was investigated. The acids varied in the number of carboxylate groups, from dibenzoic acids (phthalic, isophthalic, and terephthalic) through to the hexabenzoic acid (mellitic acid). It was found that the stereochemistry of the dibenzoic acids was important, as was the pH of the solution (trimesic acid was used as a test case and showed that greatest inhibition was achieved with all carboxylate groups deprotonated). Interestingly, for both the calcite and barite systems, mellitic acid was found to be both a potent inhibitor and a significant crystal growth modifier. In the case of barite, the presence of mellitic acid produced nanoparticles that agglomerated. The nanoparticles were found to be ∼20 nm in size from X-ray diffraction (XRD) line width analysis and 20−50 nm from transmission electron microscopy (TEM). Humic acid was also tested and found to form bundled fibers of barium sulfate.
Databáze:	OpenAIRE
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