In this paper, we report a process control strategy for the production of metastable R-form glycine crystals of a desired mean mass size by manipulating the alternating temperature profile and the final termination temperature. The seed crystals of the R-form glycine introduced were grown successfully to the size of the product with no fine crystals. Generation of the γ-glycine crystals (stable polymorph) was completely avoided. This crystallization method is flexible and easy to operate, because the alternating temperature profile can be determined on-site according to the transient supersaturation and particle count number data obtained from an in-situ ATR-FTIR spectrometer and an in-situ FBRM particle counter, respectively. The termination time or batch time was also determined on-site to a point that the residual supersaturation became zero. This on-site strategy-determination technique is expected to be applied widely for a variety of polymorphic systems other than the glycine-water system as a practical method for the selective crystallization of metastable polymorphs.

The grain morphology of tetrabenzoporphyrin (TBP) after solid-state crystallization by annealing from tetrabicycloporphyrin (CP) was found to be influenced by the annealing temperature, but the grain orientation was not significantly changed by the temperature. From the thin film XRD measurements, the b axis, which is the most favorite direction to enhance the carrier mobility, was found to grow in parallel to the substrate, but at high temperatures, the growth direction was slightly inclined from the substrate surface. The FET performance showed dependency on the annealing temperatures, showing that the carrier mobility was three times higher for the film prepared at lower temperature compared to that at higher temperatures.

Solubilities of 1,3‐butadiene and trans‐2‐butene are reported for a pressure of 101.325 kPa and temperatures ranging from 278 to 323 K in the solvents carbon disulfide, acetic acid, acetone, dimethyl formamide, dimethyl acetamide, and ethyl acetate. The solvents were chosen to attempt to elucidate the complex molecular interactions that occur with certain reactive gases and some commercial extractive distillation, as well as other solvents.

In this paper we describe a relatively simple apparatus for measuring gas solubilities In a corrosive solvent at various gas partial pressures, the main requirements for which are accurate pressure measuring devices. We summarize all the data for sulfur dioxide solubilities in aqueous sulfuric acid solutions available to us and present them In a form suitable for further comparison and possible applications. Finally we add to the data the results of our own work for two temperatures and a range of gas partial pressures for the acid concentration of 97.0 wt %.