Dissertation > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic carboxylic acid and its derivatives

Study on the Polymorphism and Caking Mechanism of Glycine

Author WangMing
Tutor YinQiuXiang
School Tianjin University
Course Chemical Engineering
Keywords Glycine Polymorphs Crystal transition Caking
Type Master's thesis
Year 2007
Downloads 192
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Glycine is the most simple of the amino acid of a structure , a very broad field of applications . So far found three kinds of crystal form : α , β , and γ-type crystal has a glycine . Of glycine producing countries , but due to crystallization technical backwardness , not required to control the products polymorphs , α- product in the production of glycine are metastable products during storage and transport due to crystal transition easy caking is very inconvenient to use . In this paper, the problems in China 's glycine production on the crystallization conditions of the common α and γ polymorphs of glycine and its transformation mechanism system . , Its crystal structure was determined by X-ray single - crystal diffractometer , and the molecular packing of the crystals analyzed by a single crystal of the α and γ crystal form obtained in different solution environments glycine . X-ray powder diffraction measurement, the α and γ crystal type monocrystalline method determined by powder XRD patterns glycine mixed crystal of the α and γ crystal content . Using laser dynamic method the effects of α-type and γ-type glycine in the purified water, and contains a certain amount of NaOH , a solubility in the aqueous solution of NaCl . Van't-Hoff equation , and Grant equation for glycine in pure water solubility data of the association, the association of the two kinds of equations results were satisfactory. A crystal transition glycine thermodynamic analysis . DSC determination of the thermodynamic properties of the α and γ- glycine crystal transition and melting process . Glycine crystallization process of different polymorphs experiments explore the mechanism of crystallization of different polymorphs of glycine , while factors affect glycine crystal transition , and combined with glycine recrystallization and crystal transformation of glycine caking mechanism analysis . The glycine polymorph crystallization and the crystal type changes , determine the specific crystalline form of glycine crystallization process and the factors influencing the process of crystal transformation , for the realization of the the glycine polymorphs of control and avoid product storage and transport process crystal transition basis .

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