稀土固体超强酸催化合成草酸二丁酯

Synthesis of Dibutyl Oxalate Catalyzed by Rare Earth Solid Catalyst

以稀土固体超强酸La3 + /TiO2 /SO42 -为催化剂 ,催化酯化合成草酸二丁酯。考察了酯化温度、正丁醇与草酸物质的量比、带水剂苯用量、反应时间、催化剂用量等因素对反应的影响。结果表明 :在 12 0℃ ,正丁醇与草酸物质的量比为 4 ,带水剂苯用量为 15mL/ 0 1mol草酸 ,反应时间为 2 5～ 3h ,催化剂用量为 0 .8g/ 0 .1mol草酸的条件下 ,草酸二丁酯收率大于 93.7%。

A rare-earth solid superacid catalyst La 3+ /TiO 2/SO 4 2- was prepared and used in the esterification of oxalic acid and but anol to obtain dibutyl oxalate.5 influence factors were examined,they are temperature,molar ratio of alcohol to acid,catalyst weight,solvent dosage and reaction time.The best conditionis:temperature at 120℃;molar ratio,4;solvent dosage,15mL/0.1 mol oxalic acid;time,3.0 h;weight of catalyst,0.8 g/0.1 mol oxalicacid.Under the optimum condition,the yield was over 93.7%.