Purification of crude lactide to polymerization grade purity by molt recrystallization methodстатья
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Дата последнего поиска статьи во внешних источниках: 27 января 2018 г.
Аннотация:Waste polymer materials are a greater threat to the environment, as a result it becomes necessary the development and production of biodegradable polymers. The process of purification of crude lactide by the method of melting impurities to polymerization grade L-lactide purity was investigated. Design and methodology for the process on a laboratory research installation was proposed. It is established that the yield and degree of purity of L-lactide are affected by two main parameters: the heating rate and nitrogen flow rate. It is found that under optimum conditions of purification of L-lactide from its major impurities is possible to obtain the product with polymerization grade purity with a yield of about 50 %. Optimal temperature profile of the process of the melting impurities were found. Wherein the total time of the stage of purification is reduced for 1.5 h with a sufficient reduction of energy consumption.