Chemical recycling of bio-based polymer poly(3-hydroxybutyrate) (PHB) by methanolysis was discussed in detail from the perspective of biological refining. The results of methanolysis transformed PHB into ester monomer successfully by using some ionic liquids. PHB was depolymerized into methyl 3-hydroxybutyrare (M3HB) at lower degradation temperatures in the presence of Brønsted-Lewis acidic ionic liquid 1-(3-sulfonic acid)-propyl-3-methylimidazole ferric chloride ([MIMPS]FeCl₄) as catalyst. Obtained M3HB from this reaction can be used in many areas, which is consistent with the principles of sustainable development. Then, the influences of reaction parameters on PHB methanolysis were investigated and the optimum conditions were obtained. Under the optimum conditions, the conversion of PHB and yield of M3HB was 98.5% and 87.4%, respectively. This catalyst could be recycled up to 6 times with no apparent decrease in catalytic activity. At the same time, the methanolysis mechanism of PHB is proposed through the experiments. In addition, kinetic study indicated that this reaction was pseudo-first-order reaction with activation energy of 24.74 kJ/mol.

从生物精制的角度详细讨论了通过甲醇裂解对生物基聚合物聚（3-羟基丁酸酯）（PHB）进行化学回收的方法。甲醇裂解的结果是，通过使用某些离子液体成功地将PHB转化为酯单体。在Brønsted-Lewis酸性离子液体1-（3-磺酸）-丙基-3-甲基咪唑三氯化铁（[MIMPS] FeCl ₄）作为催化剂。从该反应中获得的M3HB可用于许多领域，这与可持续发展的原则是一致的。然后，研究了反应参数对PHB甲醇分解的影响，并确定了最佳条件。在最佳条件下，PHB的转化率和M3HB的产率分别为98.5％和87.4％。该催化剂可以循环使用多达6次，而催化活性没有明显降低。同时通过实验提出了PHB的甲醇分解机理。另外，动力学研究表明该反应是伪一级反应，活化能为24.74 kJ / mol。