生物质焦油的超临界萃取和分离纯化的模拟研究

发布时间：2018-07-09 21:36

本文选题：生物质焦油 + 超临界萃取　；参考：《武汉科技大学》2015年硕士论文

【摘要】：生物质焦油是一种复杂的混合物,具有用作液体燃料和化工原料的潜质,其深加工研究可以达到资源综合利用和源头防止污染的双重目的,研发低能耗、高效率、工艺简单和绿色清洁的生物质焦油加工技术,将成为促进生物质能源产业可持续发展的重要因素之一。本课题采用超临界乙醇萃取研究生物质焦油的分离预处理,采取软件模拟精馏来探索生物质焦油的清晰分离。其中,以酚油中的苯酚、对甲酚和萘油中的萘来模拟生物质焦油,通过超临界乙醇萃取三元组分,探究温度和压力对超临界萃取效果的影响和模拟生物质焦油的不同组分在超临界乙醇中的溶解分配规律。精馏操作的工艺条件对馏分组成有很大的影响,但常规条件下精馏参数的确定十分困难。因此我们用化工软件来模拟生物质焦油的精馏,确定初步工艺条件,再以再沸器热负荷最低值为优化条件来优化过程参数,并进行对比。研究表明,在模拟生物质焦油的超临界萃取实验中,三元组分的萃取规律较为接近,当温度为270oC、压力为13.4MPa时,萃取效果最佳,此时,对甲酚、苯酚和萘的萃取率分别为64.19%、63.02%、62.41%;模拟精馏结果表明,两次模拟,塔1和塔2最佳理论板数均为33、64,原生物质焦油的最佳进料板数为16、40,萃取后的焦油为15、39,此时两塔的再沸器热负荷最小。提高焦油的质量分数有利于焦油的精馏。超临界乙醇萃取三元组分和化工软件模拟三元组分的分离纯化的研究,能为生物质焦油绿色加工的工程化提供一定参考。
[Abstract]:Biomass tar is a complex mixture, which has the potential to be used as liquid fuel and chemical raw material. Its deep processing can achieve the dual purpose of comprehensive utilization of resources and prevention of pollution at source, and research and development of low energy consumption and high efficiency. Simple and green biomass tar processing technology will become one of the important factors to promote the sustainable development of biomass energy industry. In this paper, supercritical ethanol was used to separate and pretreat tar from graduate students, and software simulation distillation was used to explore the clear separation of biomass tar. Among them, phenol in phenolic oil, p-cresol and naphthalene in naphthalene oil were used to simulate biomass tar, and ternary components were extracted by supercritical ethanol. The effects of temperature and pressure on supercritical extraction were investigated and the dissolution and distribution of different components of biomass tar in supercritical ethanol were simulated. The process conditions of distillation operation have great influence on the composition of distillate, but it is very difficult to determine the distillation parameters under conventional conditions. Therefore, we use chemical software to simulate the distillation of biomass tar, determine the initial process conditions, and then optimize the process parameters with the minimum heat load of the reboiler as the optimization conditions, and compare the process parameters. The results show that the extraction law of ternary components is close in the supercritical extraction experiment of simulated biomass tar. When the temperature is 270oC and the pressure is 13.4 MPA, the extraction effect is the best. The extraction rates of phenol and naphthalene were 64.19 and 63.02and 62.41, respectively. The results of simulation distillation showed that the optimum theoretical plates of tower 1 and tower 2 were both 33 ~ 64, the optimum number of feeding plates of primary tar was 16 ~ 40, and that of tar after extraction was 1539. The reboiler heat load of two columns was the least. Increasing the mass fraction of tar is beneficial to the distillation of tar. The study on the separation and purification of ternary components by supercritical ethanol extraction and chemical software simulation can provide a certain reference for the engineering of biomass tar green processing.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028;TQ223.122

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