AN INVESTIGATION ON THE FORMATION OF CALCIUM NAPHTHENATE FROM COMMERCIAL NAPHTHENIC ACID SOLUTIONS BY THERMOGRAVIMETRIC ANALYSIS

A. P. D. Moreira, A. M. R. F. Teixeira

Abstract


Thermogravimetry (TG) is an excellent technique to measure the content of volatile compounds, and can be used in the analyses of derivative samples of petroleum. In order to investigate calcium naphthenate formation and try to understand its precipitation mechanism, thermogravimetric analysis were applied in the characterization of petroleum and naphthenic acid samples. Naphthenates are solids formed by mixing oil and water. They are insoluble in either phases and are deposited at oil/water interfaces, causing serious problems to the oil industry. The results showed that calcium naphthenate is produced together with calcium sulfate and calcium carbonate under different pH’s. Thermogravimetry analysis showed that it is possible to distinguish individual compounds in the same sample, giving evidence that it is a good tool for naphthenate characterization.

Keywords


naphthenate; naphthenic acid; thermogravimetry; precipitation

Full Text:

PDF