竹炭基固体酸加压催化高酸值油脂的降酸效果

 选取4年生的慈竹和浓硫酸为原料制备竹炭基固体酸催化剂,考察用该催化剂催化油酸和甲醇酯化反应,以模拟高酸值油脂的酯化降酸效果,并研究了醇油比、催化剂用量、反应温度、反应时间及重复利用性等因素对转化率的影响.通过单因素试验确定甲醇和油酸体积比为1∶1,催化剂用量为2%,反应温度为120 ℃,反应时间为4 h的条件下,其油酸转化率为94.70%,通过和无催化剂对照试验对比,油酸转化率提高50%,催化剂重复使用到第5次时,油酸转化率仍可达到72.47%.

Carbon-based solid catalyzed esterification reaction of oleic acid and methanol with effects of reducing high-acid value

Carbon-based solid acid was synthesized from four-year old bamboo powder and 98% sulphuric acid.Oleic acid acted as raw material to simulate the high-acid value oils in the esterification reaction,using the carbon-based solid acid as catalyst to reduce the acid value of the product.Different reaction conditions and the catalyst performance were evaluated by esterification ratio of oleic acid by the single factor tests.The conversion ratio of oleic acid was 94.70% when the esterification reaction under the following conditions:reaction temperature was 120 ℃,reaction time was 4h,volume ratio of methanol to oleic acid was 1∶ 1 and catalyst content was 2% of the total mass of methanol and oleic acid.The conversion ratio maintained 72.47% after repeatedly using of catalyst 5 times,which was still much higher than 62.82%,the conversion ratio of the comparation experiment without catalyst under the same reaction conditions.