苯基有机物在硅油类溶剂上的吸收传质性能实验探讨

Experimental Study on the Absorption and Mass Transfer Properties of Phenyl Organic Compounds in Silicone Oil Solvents

焦油脱除是生物质气化规模化应用的瓶颈之一,目前研究主要集中于焦油的脱除效果、吸收剂的筛选和吸收系统工艺的设计,对核心吸收单元的传质机理探索较少。搭建生物质焦油模拟物吸收评价装置,选取苯和甲苯为焦油模拟物,对硅油类为代表的吸收剂展开传质性能研究。初步探讨吸收性能与吸收剂所含基团之间的作用关系,分析不同黏度甲基硅油对吸收过程的影响。结果表明:硅油类吸收剂对两种模拟物具有较好吸收性能,苯甲基硅油、氨基硅油、甲基硅油、水性硅油对苯的单位吸收量由517 mg·L^(-1)降低到96 mg·L^(-1);对甲苯的单位吸收量由488 mg·L^(-1)降低到157 mg·L^(-1),氨基和苯环的存在可明显地改善焦油吸收量。甲苯的吸收能力随着黏度的增大呈现线性变化,而苯的吸收能力呈现指数性降低,拟合得到了体积吸收系数和黏度的关联曲线。

Tar removal is one of the bottlenecks in large-scale application of biomass gasification. The research mainly focuses on the removal effect of tar, the selection of absorbent and the design of absorption system process,while the mass transfer mechanism of core absorption unit is seldom explored. An absorption evaluation device for biomass tar mimics was built. Benzene and toluene were selected as tar mimics to study the mass transfer performance of silicon oil as representative of the absorbent. The relationship between the absorbent and the groups contained in the absorbent was preliminarily discussed,and the influence of different viscosity of methyl silicone oil on the absorption process was analyzed. The results showed that,silicone oil absorbents had good absorbability to the two kinds of simulants. The unit absorbance of benzene reduced from 517 mg·L^(-1)to 96 mg·L^(-1)by benzomethyl silicone oil, amino silicone oil, methyl silicone oil and water-based silicone oil. The unit absorption of toluene decreased from 488 mg·L^(-1)to 157 mg·L^(-1). The presence of amino and benzene rings significantly improved the tar absorption. The absorptive capacity of toluene changed linearly with the increase of viscosity, while that of benzene decreased exponentially. The correlation curve between volume absorption coefficient and viscosity was obtained by fitting.