摘要
以高酸值桐油毛油为原料,采用预酯化、加氢、酯交换的工艺方法制备生物柴油,得到了各反应过程在适宜反应条件下的结果。其中,预酯化的反应条件为:反应温度75℃,反应压力0.8 MPa,醇油比8∶1,体积空速2 h^(-1),反应产物酸值为0.3 mg KOH/g;加氢反应条件为:反应温度140℃,反应压力3.0 MPa,氢油摩尔比200,液体体积空速1 h^(-1),反应产物碘值125.5 gI_2/(100 g);酯交换反应条件为:反应温度120℃,醇油比10∶1,催化剂质量分数6%(以油质量计),反应时间3 h,转化率99.49%;产品精制条件为:塔底再沸器温度190~235℃,塔顶温度120~180℃,真空度300~400 Pa,回流比3~5,产品收率80.2%,脂肪酸甲酯质量分数97.70%。得到的桐油生物柴油产品的酸值、十六烷值等指标均满足国家标准要求。
Biodiesel was prepared from Tung oil of high total acid number（TAN） by the process of preesterification,hydrogenation and transesterification. The reaction results of these reaction processes under the optimal reaction conditions have been obtained. The optimal reaction conditions of pre-esterification are that：the reaction temperature is 75 ℃,the reaction pressure is 0. 8 MPa,the molar ratio between ethanol and Tung oil is 8∶ 1,the volumetric space velocity of Tung oil is 2 h^-1,and the total acid number（TAN） of reaction product is 0. 3 mg KOH/g; The optimal reactions of hydrogenation are that： the reaction temperature is140 ℃,the reaction pressure is 3. 0 MPa,the molar ratio between hydrogen and Tung oil is 200,and the volumetric space velocity of Tung oil is 1 h^-1 and the iodine number is 125. 5 gI2/（100 g）; The optimal reaction conditions of transesterification are that： the reaction temperature is 120 ℃,the molar ratio between methanol and Tung oil is 10∶ 1,the catalyst dosage is 6% of the mass of Tung oil,the reaction time is 3 hrs and the conversion of Tung oil is 99. 49%; The optimal conditions of product refining are that： the temperature of bottom reboiler is 190 - 235 ℃,the overhead temperature of tower is 120 - 180 ℃,the vacuum degree is 300 -400 Pa,the reflux radio is 3 - 5 and the product yield and the fatty acid methyl ester content of product are80. 2% and 97. 70% respectively. The specifications of bio-diesel product from Tung oil like total acid number,cetane number,etc meet Chin national standards.
出处
《炼油技术与工程》
CAS
2017年第12期32-36,共5页
Petroleum Refinery Engineering
关键词
桐油
生物柴油
预酯化
加氢
酯交换
Tung oil, biodiesel, pre-esterification, hydrogenation, transesterification
