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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (4): 9-16.doi: 10.3969/j.issn.0253-2417.2020.04.002

• 研究报告 • 上一篇    下一篇

生物油典型含氧化合物在分子蒸馏过程中的分离特性研究

刘翊希(),戴贡鑫,张兴,王凯歌,王树荣*()   

  1. 浙江大学 能源清洁利用国家重点实验室, 浙江 杭州 310027
  • 收稿日期:2020-03-14 出版日期:2020-08-28 发布日期:2020-08-21
  • 通讯作者: 王树荣 E-mail:yixiliu@zju.edu.cn;srwang@zju.edu.cn
  • 作者简介:刘翊希(1995-),女,江西新余人,硕士生,主要从事生物油分离提质方面的研究工作; E-mail:yixiliu@zju.edu.cn
  • 基金资助:
    国家自然科学基金创新研究群体项目(51621005)

Separation Characteristics of Typical Oxygenate Components of Biomass Pyrolysis Oil in Molecular Distillation

Yixi LIU(),Gongxin DAI,Xing ZHANG,Kaige WANG,Shurong WANG*()   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • Received:2020-03-14 Online:2020-08-28 Published:2020-08-21
  • Contact: Shurong WANG E-mail:yixiliu@zju.edu.cn;srwang@zju.edu.cn

摘要:

对棉花秆热解得到的生物油进行了一系列不同蒸发面温度和压力条件下的分子蒸馏实验,探究蒸馏产物的宏观特性以及典型含氧化合物在不同蒸馏条件下的分离特性。研究发现:馏出组分具有较高的氢碳比和氧含量,残余组分具有较高热值和碳含量,但n(H):n(C)接近1:1。引入分离因子(αi,n)对典型含氧化合物的蒸出能力进行半定量评估,结果表明:乙酸、1,1-二甲氧基丙烷、2,5-二甲氧基四氢呋喃等小分子化合物在实验条件下极易被蒸出,3-甲基-1,2-环戊二酮的蒸出能力受实验中蒸馏条件的影响较高;大分子化合物中,单酚类化合物的蒸出能力突出,其中愈创木酚在1 500 Pa下的蒸出能力最强,苯酚受温度变化影响较小;二酚的蒸出能力远低于单酚,其中苯二酚在2 500 Pa/50℃下蒸出能力极差,但进一步降低压力可大幅提升其蒸出性能;长链酯类和糖类化合物的蒸出能力受蒸馏温度和压力变化的影响较小。

关键词: 生物质, 生物油, 分子蒸馏, 分离特性, 分离因子

Abstract:

In order to investigate the separation characteristics of typical oxygenate components of biomass pyrolysis oil in both macro- and micro-level, a series of molecular distillation experiments were conducted under different evaporation temperature and operation pressure using cotton stalk pyrolysis oil as raw material. It showed that the distilled fractions had higher H/C molar ratios and contained higher oxygen content than the residual fractions, while the residual fractions contained higher carbon contents with higher heating value and their H/C molar ratios was close to 1. The separation factor(αi, n) was defined based on previous study and was used to evaluate the separation characteristics of typical compounds in micro-level. It showed that compounds with light molecular weights such as acetic acid, 1, 1-dimethoxy-propane, tetrahydro-2, 5-dimethoxy-furan were very easy to be distilled under all experiment conditions, while the distillation of 3-methyl-1, 2-cyclopentanedione was highly affected by the temperature and pressure in the experiment.It also indicated that monophenol compounds such as guaiacol, syringol and phenol could be distilled more easily than other compounds with large molecular weight, among which guaiacol was the easiest one to be distilled under 1 500 Pa and the phenol was less affected by temperature changes. It was much harder to distill diphenol than monophenol, among them, benzenediol showed comparatively poor distillation characteristics under the conditions of 2 500 Pa/50 ℃ especially. However, further lower the operation pressure could facilitate the evaporation of benzenediol largely. The changes of evaporation temperature and operation pressure had less effect on distillation of long-chain esters and carbohydrates than other compounds with large molecular weight.

Key words: biomass, biomass pyrolysis oil, molecular distillation, separation characteristics, separation factor

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