Method for separating organic zinc catalyst from polyalkylene carbonate polymerization solution
A polyalkylene carbonate and polyalkylene glycol technology, applied in the field of separation of organic zinc catalysts, can solve problems such as decomposition, polyalkylene carbonate pollution, and poor separation efficiency of catalyst particles
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Embodiment 1
[0047] Carbon dioxide and ethylene oxide were polymerized in the presence of an organozinc catalyst to synthesize a polyalkylene carbonate resin solution.
[0048] Then, carbon dioxide was removed from the polymerization reactor, and the polyalkylene carbonate resin including the solvent, the polyalkylene carbonate resin, the organozinc catalyst, and the like was additionally aged for one day while being stirred at 25° C. as it was.
experiment Embodiment 1
[0052] The states of the polymerization solutions obtained according to Comparative Example 1 and Example 1 were visually inspected. exist figure 1 In , photographic images showing the states of the polymerization solutions of Comparative Example 1 and Example 1 are shown. Such as figure 1 As shown, in the solution of Comparative Example 1 not subjected to aging treatment, the components were uniformly dispersed without phase separation, but on the contrary, in the solution of Example 1 subjected to aging treatment, phase separation was exhibited.
[0053] In addition, in order to confirm the composition, NMR analysis was performed on samples taken from the polymerization solution of Comparative Example 1 and the upper layer solution and the lower layer solution of the polymerization solution of Example 1. The analysis results are shown in [Table 1] below.
[0054] [Table 1]
[0055]
[0056] PEC: Polyethylene carbonate, PEG: Polyethylene glycol
[0057] As shown in [T...
experiment Embodiment 2
[0060] A filter pad of cellulose material was installed in a filter press, and the polymerization solutions of Comparative Example 1 and Example 1 were passed therethrough to conduct a filtration experiment. The polymerization solution was injected at a pressure of 7 bar and the filtered solution was placed in a glass vial for comparison of clarity. exist figure 2 In , a photographic image showing the state of the solution after filtration and put into a glass vial is shown. Such as figure 2 As shown, it was confirmed that the solution of Example 1 was transparent after filtration, but the solution of Comparative Example 1 was opaque after filtration because the organozinc catalyst was not separated but remained.
[0061] In addition, in order to check the remaining amount of catalyst in the filtered solution, the Zn metal content in the filtered solution was measured using an inductively coupled plasma (ICP) device. The measurement results are shown in [Table 2] below. ...
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