A Simple Method for the Preparation of Glycine

Abstract

NOTES 2797and the Hagarsalk~wski~ tests for cholesterol, obtaining positive tests.

Phase Equilibria for the Glycine–Methanol–NH4Cl–H2O System

“…11−14,28−30 Prior to the comparison, standard deviations of all of the experimental points were calculated and are plotted in Figure 1. The maximum standard deviation for the solubility of glycine in NH 4 Cl aqueous solutions is about 0.10 in terms of the molality of glycine, that for the solubility of NH 4 Cl in glycine aqueous solutions is 0.12 in terms of the molality of NH 4 Cl, and that for the multiple saturation points is 0.20 on the basis of the molality of NH 4 Cl. As shown in Figures 2 and 3, which represent the solubilities of glycine and NH 4 Cl, respectively, in pure water at various temperatures, good agreement was found between the experimental data and the reported values.…”

“…The subscript glycine herein refers to the neutral species of glycine, which is also known as zwitterionic glycine with the formula + NH 3 CH 2 COO − . The newly obtained parameters were reported in Table 1, and a comparison between the regressed values and the experimental solubility in the glycine− NH 4 Cl−H 2 O system is presented in Figure 4. It is obvious that all of the regressed solubility data are in excellent agreement with the experimental values.…”

“…The HKF parameters (a 1 −a 4 , c 1 , c 2 , and ω) and the thermodynamic property data required for calculating K 2 and K 3 , together with relevant information for other main species in the glycine− NH 4 Cl−H 2 O system were taken from the OLI Databank (version 9.1) and are listed in Tables S1 and S2 in the Supporting Information.…”

“…The solubility of glycine in (NH 4 ) 2 SO 4 solution at 298.2 and 323.2 K was also measured by Ferreira et al, 15 in which a salting-in effect was found on the solubility of glycine in the presence of (NH 4 ) 2 SO 4 . It should be noted that, although the thermodynamic properties including solubility of glycine have been studied extensively, no data related to glycine in NH 4 Cl solution have been reported.…”

“…In the present study, the phase equilibrium of the glycine− NH 4 21 The effects of the temperature, the concentration of NH 4 Cl, and the pH on the distribution of glycine species in unsaturated solutions were analyzed. Interpretation of the separation process in the production of glycine is presented based on the phase diagram of the glycine−NH 4 Cl− H 2 O system.…”