多级逆流液液萃取法浓缩糠醛的研究

Concentration of furfural by multi-stage countercurrent liquid-liquid extraction method

分别选择1,1,1-三氯乙烷和四氯化碳为萃取溶剂,研究液液萃取法浓缩糠醛过程,以UNIQUAC方程为平衡模型,建立逆流模拟计算框图,计算结果表明1,1,1-三氯乙烷和四氯化碳是糠醛浓缩的有效溶剂,在N=4时,分离后糠醛质量分数达99.3%以上,萃余液中糠醛质量分数可降至0.07%以下,以1,1,1-三氯乙烷为萃取剂,分离后糠醛质量分数达99.9%以上,收率达到98.5%以上;在模拟计算的基础上,建立液液萃取装置并进行试验,试验和模拟结果基本一致,研究结果为进一步放大试验研究提供了有效的依据。

1, 1,1-Trichloroethane and carbon-tetrachloride were selected as extractive solvents, the concentration process of furfural was studied by liquid-liquid extractive method, the UNIQUAC equation was regarded as equilibrium model, the countercurrent frame-chart of simulation calculation was established, and the countercurrent separation results were simulated. The results indicate that 1,1,1-trichloroethane and carbon-tetrachloride are effective solvents. When N = 4, the mass fraction of furfural reaches more than 99.3% and less than 0.07% in surplus phase; when taking 1,1,1-trichloroethane as solvent, the mass fraction of furfural reaches more than 99.9%, the yield of furfural reaches more than 98.5%. The liquid-liquid extraction apparatus was established and the experiment was made on the basis of the simulation. Its results are consistent with the simulation results, and can provide an effective basis for the further scale-up research.