皂脚热解-催化气态加氢制备生物燃料  

Producing biofuels from soapstock via pyrolysis and subsequent catalytic vapor-phase hydrotreating process

作　　者：李栋先 王佳 蒋剑春[1,2] LI Dongxian;WANG Jia;JIANG Jianchun(College of Chemical Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China;Institute of Chemical Industry of Forest Products,Chinese Academy of Forestry,Nanjing 210042,Jiangsu,China)

机构地区：[1]南京林业大学化学工程学院,江苏南京210037 [2]中国林业科学研究院林产化学工业研究所,江苏南京210042

出　　处：《化工进展》2023年第6期2874-2883,共10页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(52006106);国家重点研发计划(2019YFB1504001)。

摘　　要：皂脚的资源化、高值化利用对减少环境污染和实现碳中和具有重要的意义。本文以皂脚为原料,采用双级加压固定床为反应器,对其进行热解-催化气态加氢处理以制备生物燃料。研究了皂脚热解-非催化和催化气态加氢处理对产物正构烷烃的影响,并提出了皂脚热解-催化气态加氢制备正构烷烃的反应机理。以最大化生成正构烷烃为目标,又对热解温度和气态加氢温度工艺参数进行了优化处理。实验结果表明,与非催化条件相比,在Ni/Al_(2)O_(3)-SiO_(2)催化剂的作用下,热解初级中间体被完全脱氧和氢化,使得C5~C17正构烷烃的相对含量由15.8%增加至97.3%。随着热解温度的升高,正构烷烃的产量先升高再降低,550℃时产量最高;随着气态加氢温度的升高,正构烷烃的产量逐渐降低,300℃时产量最高。Chemical upcycling soapstock into biofuels is of great significance to reduce environmental pollution and achieve carbon neutrality.Biofuels were produced from soapstock by pyrolysis and subsequent catalytic vapor-phase hydrotreating in a pressurized two-stage fixed bed reactor.The effects of soapstock pyrolysis,non-catalytic and catalytic vapor-phase hydrotreating on the production of n-alkanes were explored.The reaction mechanism of n-alkanes obtained from the pyrolysis and catalytic vapor-phase hydrotreating of soapstock was proposed.To maximize the production of n-alkanes,the process parameters including pyrolysis temperature and hydrogenation temperature were optimized.Experimental results indicated that the primary intermediates of pyrolysis were completely deoxygenated and hydrogenated with Ni/Al_(2)O_(3)-SiO_(2) catalyst,and the relative content of C5—C17 n-alkanes increased from 15.8%to 97.3%,compared with that of the non-catalytic.The yield of n-alkanes initially increased and then decreased with increase of pyrolysis temperature,and the highest yield was observed at 550℃.The yield of n-alkanes gradually decreased with increase of hydrogenation temperature,and the highest yield was observed at 300℃.

关 键 词：皂脚 热解 加氢 生物燃料 正构烷烃 

分 类 号：TS229[轻工技术与工程—粮食、油脂及植物蛋白工程] TK6[轻工技术与工程—食品科学与工程] TE667[动力工程及工程热物理—生物能]