Deplasticization and dechlorination of flexible polyvinyl chloride in NaOH solution by microwave heating |
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Authors: | Fumio Osada Junzo Yana |
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Institution: | 1. Research and Development Group, Engineering Department, Industrial Solutions Factory, Nikkiso Co., Ltd., 2-16-2 Noguchi-cho, Higashimurayama, Tokyo, 189-8520, Japan 2. Business Development and Resource Management Center, Nikkiso Co., Ltd., Tokyo, Japan
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Abstract: | This study investigated the deplasticization and dechlorination of flexible polyvinyl chloride (PVC) containing 59.2% PVC, 29.7% dioctyl phthalate (DOP), and approximately 12% stabilizers. Flexible PVC was treated with NaOH solutions at concentrations in the range 2–16 mol/l and heated by microwaves to temperatures between 100° and 250°C for 0–120 min. DOP was extracted from flexible PVC into the NaOH solution as a phthalic acid salt; the remaining PVC was subsequently dechlorinated by increasing the temperature. On internal heating using microwaves, the plasticizer was 100% extracted during processing at 150°C for 30 min, whereas the chlorides were 100% removed during processing at 235°C for 30 min; the residue was converted into hydrocarbon compounds. The maximum weight loss ratio was 71% compared to the pretreatment state. It was also found that 100% deplasticization and dechlorination was possible using 8 mol/l NaOH solution, which is almost half the concentration employed when using conventional external heating systems. |
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