The solution-mediated transformation of anhydrous L-phenylalanine in a saturated solution of monohydrate L-phenylalanine has been studied and the transformation rate quantified using the powder X-ray diffraction technique. It has been demonstrated that the anhydrous form is not stable below 37 °C (transition point) in the presence of additives, as previously reported (Sato, T.; Sano, C. European Patent 0703214A2, 1995), and that the additives (ammonium sulfate and dextrose) affect only the transition rate but not the thermodynamic stability or the transition point.

No abstract

An experimental study of the pressure swing adsorption (PSA) process, which separates CO2 from the flue gas of the power plant, was investigated. Three adsorption columns packed with activated carbon were used and pressurization, adsorption, pressure equalization, rinse, and evacuation steps were applied in a cyclic process. Two cases of the rinse method were used with various feed and product flow rates, and also two kinds of recycle methods were introduced for enhancing the recovery. As a result, the PSA process that separates CO2 at a purity of 99% and recovery of 55% from the gas mixture similar to the flue gas of a power plant was obtained.