硫酸氢钠催化合成二甲基丙烯酸新戊二醇酯

Synthesis of neopentyl glycol dimethacrylate catalyzed by sodium bisulfate

以甲基丙烯酸和新戊二醇为原料、硫酸氢钠为催化剂高效合成了二甲基丙烯酸新戊二醇酯，考察了影响酯收率的各种因素，确定最佳反应条件：n（甲基丙烯酸）：n（新戊二醇）=2．3：1；催化剂用量7．5％（占新戊二醇质量分数），带水剂环己烷用量60％，阻聚剂对苯二酚用量0．625％，反应温度（110-115）℃，反应时间2．0h，酯收率可达94％以上。比较了不同催化剂的催化活性，结果表明，硫酸氢钠具有催化活性好、可重复利用、不腐蚀设备和环境污染小等优点，是合成二甲基丙烯酸新戊二醇酯的优良催化剂。

Neopentyl glycol dimethacrylate was synthesized by esterification of methacrylic acid and neo- pentyl glycol over sodium bisulfate catalyst. Influence of reaction condition on the yield of esterification was investigated. The optimum condition was obtained as follows： methacrylic-acid-to-neopentyl-glycol molar ratio 2.3：1 ;dosage of sodium bisulfate --7.5% of neopentyl glycol; cyclohexane dosage =60% of neopentyl glycol; dosage of hydroquinone = 0. 625% of neopentyl glycol; reaction temperature 110 - 115 ~C ;reflux and water segregating for 2.0 h. neopentyl glycol dimethacrylate yield of over 94% was obtained under the optimao condition. The experimental results indicated that sodium bisulfate exhibited higher catalytic activity, non-corrosiveness, non-pollutiveness to the environment and repeated usability.