Abstract
A series of various readily water soluble esters were synthesized by a very efficient procedure. These compounds can be useful as thermosensitive tracers for studying the cooling progress in a low enthalpy georeservoir exploitable by double flash geothermal power plant systems. The kinetics of their hydrolysis was investigated. Acylation of primary alcohols or phenols was carried out by a method based on a single-phase solvent system consisting of ethyl acetate acting as an organic solvent and triethylamine acting as a catalyst. Products were characterized by 1H-NMR, and 13C-NMR.
Highlights
Compounds susceptible to undergoing hydrolysis have raised interest as thermosensitive tracers in geothermal applications [1,2]
We examined the esterss and their hydrolysis products for their fluorescence spectrum and fluorescence intensities, water solubility, detection limit by fluorescence spectroscopy depending on the temperature, sorption behavior, pH and temperature dependence of their hydrolysis kinetics, and their chemical reactivity
We have developed a very simple, inexpensive, nontoxic, and environmentally friendly method for the acylation of primary alcohols and phenols
Summary
Compounds susceptible to undergoing hydrolysis have raised interest as thermosensitive tracers in geothermal applications [1,2]. By knowing their kinetic hydrolysis parameters it becomes possible to track thermal fronts in geothermal reservoirs and predict the thermal drawdown of the georeservoir over time. The biggest advantages of these new tracers are their high water solubility due to free sulfonic groups, an absence of geogenic background concentrations, and no fluorescence emission from esters, while at least one of the hydrolysis reaction products shows fluorescence. While amides [4] allow the study of high enthalpy systems and have long residence times, esters [5]
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