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机构地区:[1]长江大学化学与环境工程学院,湖北荆州434023
出 处:《农药》2007年第6期372-373,384,共3页Agrochemicals
摘 要:采用固体超强酸SO42-/ZrO2-TiO2为催化剂,α-萘乙酸和甲醇为原料,结合甲醇精馏回收工艺,合成了α-萘乙酸甲酯(MENA)。催化剂制备和MENA合成最佳工艺条件为:硫酸浸渍液浓度为0.5~0.55mol/L,焙烧温度550℃~600℃,焙烧时间4.0h,催化剂用量为2.0%~2.5%(占总投料量质量分数),甲醇与萘乙酸投料比为7.0∶1(体积比),回流反应,反应时间2.5h,产品收率达93.6%,催化剂重复使用7次,其产品收率仍在90%以上,催化剂再生容易。A complex catalyst system SO4^2-/ZrO2-TiO2 was prepared and used in the reaction for the synthesis of methyl 1-naphthylacetate (MENA) with the material of naphthylacetic acid and methanol and the process of methanol distillation recovery. The optimal conditions were as follows: the concentration sulphuric acid impregnation solution 0.5-0.55 mol/L, calcinations temperature 550-600 ℃, calcinations time 4.0 h, catalyst dosage 2.0-2.5% (the mass fraction of the total material), ratio of methanol and naphthylacetic acid was 7.0 : 1, reflux reaction time about 1.5 h, the yield of ester is 93.6%, after the catalyst reuse seven times, the yield of ester is above 90%. The catalyst regenerative is easy.
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