棕榈酸2-乙基己酯的催化合成研究

Study on catalytic synthesis of palmitic acid 2-ethylhexyl ester

利用硝酸铁和硝酸钴为原料制备纳米固体超强酸SO24-/CoFe2O4催化剂,透射电镜(TEM)测量结果表明,自制催化剂颗粒粒径在20～50nm左右,实验探讨了硫酸铵浸渍浓度、催化剂焙烧温度、焙烧时间对催化剂催化活性的影响.并以纳米固体超强酸SO24-/CoFe2O4为催化剂,研究棕榈酸与异辛醇合成棕榈酸2-乙基己酯过程中,影响酯化率的主要因素,实验确定的最优合成条件是:醇酸物质的量比为2.0∶1,催化剂用量为反应物总质量的0.50%,反应时间为3.0h,在此条件下反应的酯化率可达97.4%.

Nanosized solid superacid SO4^2-/CoFe2O4 was prepared with Fe （NO3 ）3 and Co （NO3 ）2 as materials. The spectrum of TEM indicated that self - synthetical catalyst particle size was approximately 20 - 50nm. Effects of （ NH4 ） 2 SO4 concentration, calcination temperature and calcination time on catalytic activity, of nanosized solid superacid were studied. The palmitic acid 2 - ethylhexyl ester was synthesized with palmitic acid and iso - octanol by nanosized solid superacid SO4^2-/CoFe2O4. The main influential factors of reaction were investigated. The optimal reaction conditions were obtained as follows： the molar ratio of isooctanol to palmitic acid was 2.0： 1, the dosage of catalyst was 0.5% （ based on total mass of reactants）, reaction time was 3. Oh and water - carrying reagent was added. Under these condition, the yield of palmitic acid 2 - ethylhexyl ester could reach 97.4 %.