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US5210283A Synthesis of tetrahydrofuran polymers using calcined silica-alumina or beaching earth catalysts 失效
使用煅烧二氧化硅 - 氧化铝或沙滩土催化剂合成四氢呋喃聚合物

Synthesis of tetrahydrofuran polymers using calcined silica-alumina or
beaching earth catalysts
摘要:
Tetrahydrofuran is polymerized in the presence of a carboxylic acid anhydride and a solid acid catalyst that has been calcined at a temperature greater than about 600.degree. C. Calcined bleaching earth catalysts give THF polymer products having a narrow molecular weight distribution; calcining amorphous silica-aluminas improves their activity toward THF polymerization.
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