化工进展

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汽爆法生产糠醛新工艺

李志松1,朱 斌2   

  1. 1湖南化工职业技术学院化学工程系,湖南 株洲 412004;2华南理工大学分析测试中心,广东 广州 510640
  • 出版日期:2012-05-05 发布日期:2012-05-05

Study on a new furfural preparation process based on steam-explosion way

LI Zhisong,ZHU Bin   

  1. 1Hunan Chemical Industry Professional Technology College,Zhuzhou 412004,Hunan,China; 2Analytical and Testing Center,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Online:2012-05-05 Published:2012-05-05

摘要: 研究了用汽爆法取代糠醛生产工艺中的酸解步骤,得出了新工艺的最佳工艺参数。取玉米秸秆20 g在1.4 MPa压力、维压时间4 min下汽爆,所得物料用60 mL热水(80 ℃)水提2 h,水提液中木糖含量可达9.96 g/L,木糖浸出率为2.79%。取350 mL水提液,加入甲苯30 mL、5%稀硫酸10 mL,于165 ℃反应精馏3 h,糠醛得率可达84%,糠醛总的质量收率为2.2%。结果表明,本工艺产生的三废量大幅减少。

关键词: 糠醛, 木糖, 汽爆, 反应精馏, 二步法

Abstract: It was studied that a steam-explosion way instead of an acid hydrolysis step was used in furfural production process. And the optimal parameters were obtained for the new process. Corn stalk 20 g was treated by steam-explosion under 1.4 MPa pressure and pressure-maintaining time for 4 min. The obtained material was extracted by 60 mL hot water(80 ℃)lasting 2 h. Xylose concentration was 9.96 g/L in the extraction water. The extraction ratio of xylose was 2.79%. The extraction water 350 mL,toluene 30 mL and 5% dilute sulfuric acid 10 mL were mixed and treated by reaction distillation under 165℃ for 3h.The furfural yield was 84%. The total mass yield of furfural was 2.2%. The three waste amounts produced from the said process were decreased largely.

Key words: furfural, xylose, steam-explosion, reaction distillation, two-step process

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