Resumo

BOLIVAR, Genaro; COLINA, Marinela; DELGADO, Blas  e  MENDIZABAL, Eduardo. The Effect of Carboxymethyl Chitosan on Calcium Carbonate Precipitation in Synthetic Brines. J. Mex. Chem. Soc [online]. 2021, vol.65, n.1, pp.109-117.  Epub 04-Jun-2021. ISSN 1870-249X.  https://doi.org/10.29356/jmcs.v65i1.1429.

When oil production by natural flow of reservoirs decreases, it is necessary to increase the production by using improved recovery processes, such as water injection. Injection of incompatible water can cause the formation of saline deposits of calcium and magnesium carbonates. The use of chemical inhibitors to treat incrustations involves the use of chemicals with functional groups such as carboxylic acids (R-COOH) or phosphonates (R-PO3 2-). A new ecological scale inhibitor, carboxymethyl chitosan (CMC1), has been synthesized and its capacity to modify the CaCO3 crystalline phases obtained in the solid residue was compared with that obtained when using a commercial carboxymethyl chitosan (CMC2) and a commercial poly(acrylic acid). The results show that under the used conditions, the CMC´s produce a slightly larger amount of crystalline phases than the synthetic inhibitor. Using the X-ray powder diffraction technique, calcite, vaterite, and aragonite were identified in the residual solid. The ratio of these phases was modified by increasing the concentration of the inhibitor. Using Scanning Electron Microscopy (SEM), it was observed that increasing the concentration of the CMC´s the modifies the crystal´s morphology from plates to spheres.

Palavras-chave : X-ray diffraction; scanning electron microscopy; optical emission spectroscopy of inductively coupled plasma (ICP); scale inhibitor; carboximethyl chitosan.

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