熔融盐裂解木焦油的初步研究

以木焦油为原料,在自制的反应器上利用ZnCl2和KCl混合盐分别在300、350、400、450和500℃下,对木焦油进行裂解试验,利用GC-MS分析木焦油裂解前后组成的变化。结果表明:木焦油的主要成分为愈创木酚、4-乙基愈创木酚、4-甲基愈创木酚、间甲酚及二丙酮醇等。较高的熔融盐温度、较低的进料速率有利于木焦油的裂解,在裂解温度为500℃,进料速率为1 g/min时,二次裂解焦油的得率为16.47%。在高温熔融盐作用下,酸、酮、酯及菲都有较明显的减少,酚类的转化较少,并且还存在其它组分向酚类的转化。

Preliminary Study on Pyrolysis of Wood Tar in Molten Salt Media

Catalytic cracking reactions was performed using wood tar as raw material under the catlysis of molten salt in fixed-bed cracking reactor.The influence of cracking temperature on the components of product was investigated.The chemical components of wood tar and secondary cracking products were analyzed using gas chromatograph with mass selective detector(GC-MS).It was found that the wood tar is mainly compsed of guaiacol,4-ethyl guaiacol,4-methyl guaiacol,3-methyl phenol,diacetone alcohol etc.Combination of high cracking temperature and low feed rate are beneficial to the cracking reaction of tar.The secondary cracking of tar yield could reach 16.47% under the reaction conditions of temperature 500℃ and the feeding rate 1 g/min.Under the effect of molten salt,the amount of acids,ketones,esters and phenanthrene was significantly reduced.The conversion of phenol is lower than other fractions,and other fractions can be converted phenolic fractions.