Kinetics of Alkyl Lactate Formation from the Alcoholysis of Poly(Lactic Acid)
Kinetics of Alkyl Lactate Formation from the Alcoholysis of Poly(Lactic Acid)
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DOI：
10.3390/pr8060738
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发表时间：
2020-06-01
期刊：
影响因子：
3.5
通讯作者：
Wood, Joseph
中科院分区：
文献类型：
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作者：
Lamberti, Fabio M.;Roman-Ramirez, Luis A.;Wood, Joseph
乳酸烷基酯是一种绿色溶剂，已成功应用于制药、食品和农业等多个行业。它们被认为是石油衍生溶剂的有前景的可再生替代品，并且存在从废聚乳酸的化学回收中获得这些有价值的化学品的机会。聚乳酸与相应的线性醇催化醇解反应得到乳酸烷基酯（乳酸乙酯、乳酸丙酯和乳酸丁酯）。由乙二胺席夫碱合成的Zn络合物催化反应。反应在50-130 ℃范围内研究，取决于醇，在自生压力下。估计了乳酸盐形成的Arrhenius温度依赖性参数（活化能和指前因子）。醇解反应的活化能Ea（1）、Ea（2）和Ea（-2）分别为62.58、55.61和54.11 kJ/mol。与丙醇和丁醇相比，乙醇中的醇解进行得最快，并且在低至50摄氏度的温度下可以实现合理的速率。这是一个很有前途的反应，可用于回收寿命终止的聚乳酸，并有助于创造循环生产经济。
Alkyl lactates are green solvents that are successfully employed in several industries such as pharmaceutical, food and agricultural. They are considered prospective renewable substitutes for petroleum-derived solvents and the opportunity exists to obtain these valuable chemicals from the chemical recycling of waste poly(lactic acid). Alkyl lactates (ethyl lactate, propyl lactate and butyl lactate) were obtained from the catalysed alcoholysis reaction of poly(lactic acid) with the corresponding linear alcohol. Reactions were catalysed by a Zn complex synthesised from an ethylenediamine Schiff base. The reactions were studied in the 50-130 degrees C range depending on the alcohol, at autogenous pressure. Arrhenius temperature-dependent parameters (activation energies and pre-exponential factors) were estimated for the formation of the lactates. The activation energies (Ea(1), Ea(2) and Ea(-2)) for alcoholysis in ethanol were 62.58, 55.61 and 54.11 kJ/mol, respectively. Alcoholysis proceeded fastest in ethanol in comparison to propanol and butanol and reasonable rates can be achieved in temperatures as low as 50 degrees C. This is a promising reaction that could be used to recycle end-of-life poly(lactic acid) and could help create a circular production economy.