纯氧氧化液体石蜡制取低级脂肪酸

采用自制纳米级T iO2基催化剂,用纯氧作氧化剂,在密闭系统中对液体石蜡催化氧化制取脂肪酸的反应进行了研究,考察了激发温度、反应温度、反应时间、氧气流量等工艺条件的影响。实验结果表明,在催化剂用量为原料石蜡质量的1%、激发温度150~180℃、反应温度140~160℃、氧气流量0.04m3/(h.kg)的条件下,一次反应后氧化石蜡的总收率平均大于100%,经4次纯氧氧化后,C5~C13脂肪酸的总收率可达58.2%,另外有附加溶剂产出,收率为7.7%。该方法尾气排放量小,基本上解决了环境污染问题,具有较好的工业应用前景。

Synthesis of Lower Fatty Acids from Liquid Wax by Oxidizing with Pure Oxygen

Oxidation of liquid paraffin with pure oxygen to synthesize fatty acid on self-made nano-TiO_2 catalyst in a closed discontinuous batch system was studied.Effects of some reaction conditions including initiation temperature,reaction temperature,reaction time and oxygen flow on reaction were investigated.Average yield of oxidized wax was more than 100% after first oxidation under initiation temperature 150—180℃,reaction temperature 140—160℃,oxygen flow 0.04m~3/(h·kg),and catalyst dosage mass fraction 1% of feedstock.After four times of oxidation,total yield of C_5—C_(13) acid reached 58.2%,yield of solvent product was 7.7% and off-gas discharge amount was little.The technology might solve environment pollution problem.Its industrial application prospect seems to be bright.