Calcium carbonate precipitation from gas-field brine under the influence of methanol was experimentally investigated in the present study. Precipitation in gas pipelines arises problems of scale formation, corrosion, and pressure drop. The experimental results of this study showed that the induction time for precipitation increased from 39 minutes for a brine solution containing 40 wt(percent) methanol to 53 minutes for a solution containing 60 wt(percent) methanol. A higher concentration of methanol resulted in more mass of precipitates and larger size particles. The produced precipitates of 5.33 g solid from one kg water in the absence of methanol rose to 5.92 g solid from one kg water in the presence of 60 wt(percent) methanol indicating an increase of 11percent. Methanol also revealed to be influential in the morphology of precipitates by gradually changing calcite to vaterite at higher concentrations of methanol. The results of this research may be used in the petroleum industry to predict the scale formation of calcium carbonate in the field brine of gas production processes.
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