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Purification process of erythritol in industrial production are currently composed of multiple steps. To improve the purification efficiency and to operate the working condition precisely, the solubility property of erythritol should be monitored. In this study, the erythritol solubilities in aqueous solvents including methanol, ethanol and 2-propanol were experimentally measured by using the gravimetric method within the temperature range of 273.15 K to 283.15.15 K (with 2 K interval) anddoi:10.13005/ojc/340129 fatcat:2l2oo3pfkrgljhauu7lpclpuqy
more »... 5 K to 323.15 K (with 10 K interval). The experimental results showed that erythritol solubility increased due to the increase of temperature but decrease of mass fraction of organic solvent. The solubility was also depended on polarities of solvents. The lowest solubility was obtained when using aqueous ethanol. To generate solubility model of erythritol, Apelblate equation, Buchowski-Ksiazaczak λh equation and Van't Hoff model were applied to explain correlation and behavior of erythritol solubility. Based on statistical analysis, Apelblate equation obtained the best correlation to the experimental data compared to Buchowski-Ksiazaczak λh equation and Van't Hoff model. The solubility model with the estimated parameters could be further applied for optimizing purification processes of erythritol in industries.
Anaerobic digestion (AD) process has been generally applied in factories for wastewater treatment and energy recovery. For the AD processes, the continuously stirred tank reactor (CSTR) with recirculation are typically applied in industries for methane production from wastewater treatment. Since the recycle stream affects the inlet concentration of the reactor, the control performance of traditional PI and PID controllers used to manipulate control actuators may be limited. Additionally, thedoi:10.1051/e3sconf/202014101007 fatcat:bspnvczi5bfhlpdpp7cxy43eji
more »... cess control loops related to biochemical reactions are generally employed the operational experiences without process dynamic consideration. A control system based on input/output (I/O) linearization control technique for an anaerobic digestion (AD) process was developed in this work. The control system applied the concept of the I/O linearization technique, which followed dynamic behaviors of the reactor with a two-step (acidogenesis-methanogenesis) kinetic model. The volatile fatty acid (VFA) concentration was regulated by manipulation of the dilution rate to achieve the requested trajectories. Control performances of the closed-loop system were investigated by a simulation under servo and regulatory problems. The simulation results showed that the developed control scheme successfully forced the controlled output to achieve the desired set points and handled the introduced control problems.
2019 Research, Invention, and Innovation Congress (RI2C)
Tawai 14.45-15.00 RI2C-0085 Performance and ethanol crossover of passive direct ethanol fuel cell stack Panuwat Ekdharmasuit 15.00-15.15 Coffee Break 15.15-15.30 RI2C-0144 Preliminary analysis ... Anucha Hirunwat 14.30-14.45 RI2C-0061 Input/output Linearization Control Technique for Anaerobic Digestion Reactor with Recirculation Sura Srisuddee, Malinee Sriariyanun, Chanin Panjapornpon, and Atthasit ...doi:10.1109/ri2c48728.2019.8999918 fatcat:3mmuib7ftvgkrcapiqilt7rol4