光稳定剂间苯二酚单苯甲酸酯的合成

研究了以苯甲酰氯和间苯二酚为原料、液碱为除酸剂,酯化合成然后精制得间苯二酚单苯甲酸酯的工艺.研究了酯化反应中温度、物料配比、pH、间苯二酚水溶液的浓度和反应时间等条件对反应的影响,获得了较佳的酯化工艺条件:苯甲酰氯与间苯二酚的摩尔比为1.15∶1;pH值为7.5;反应温度为25℃;反应时间为1.5 h;间苯二酚溶液的质量分数为10%.酯化反应收率为88.6%.考察了结晶溶剂配比、温度对产品质量和收率的影响,经实验评估得到了较佳的结晶工艺条件:结晶溶剂甲苯的体积(/mL)与初产物的质量(/g)之比为2.5∶1,结晶温度为30℃,结晶收率为95.0%.优化工艺条件下产品的总收率为84.2%.

The synthesis of light stabilizer resorcinol monobenzoate

A new process for preparation of resorcinol monobenzoate starting from benzoyl chloride and resor -cinol by esterification, extraction and crystallization was studied .The influence of temperature , pH, reaction time, resorcinol solution concentration and molar ratio of reactants on the yield of esterification was investiga -ted.The optimum reaction conditions were evaluated and selected as follows：the molar ratio of benzoyl chlo-ride to resorcinol was 1.15∶1, the pH value was 7.5, reaction temperature was 25 ℃, reaction time was 1.5 h, resorcinol solution concentration was 10%, under the optimum condition the yield of esters was about 88 .6%.The dosage of crystallization solvent and the temperature of crystallization were experimented also . The results of the experiments showed that the temperature of crystallization was 30 ℃.The ratio of solvent and reaction product was 2 .5∶1 .The yield of esterification product was about 95 .0%.The total yield was 84 .2%.