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首页> 外文会议>The 18th international drying symposium >MATHEMATICAL MODELING OF DRYING KINETICS OF HANDMADE RECYCLED PAPER WITH ADDITION OF NATURAL DYES
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MATHEMATICAL MODELING OF DRYING KINETICS OF HANDMADE RECYCLED PAPER WITH ADDITION OF NATURAL DYES

机译：除天然染料外的手撕再生纸干燥动力学的数学模型

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摘要

This paper aims to analyze the forced convective drying of handmade recycled paper dyed with natural extracts derived from the turmeric plant (Curcuma longa) and the cochineal insect (Dactylopius coccus).This research intends to find new uses to waste paper,besides alternative uses to natural dyes produced in Brazil,creating new products that can be produced by small cooperatives of paper recycling.The source of cellulose fibers for the manufacture of recycled paper was printed used paper (A4 size).The flotation system was carried out to remove toner ink particles of the pulp by adding of ethanol and hydrogen peroxide.Besides these reagents,cassava starch and carboxymethyl cellulose were added to improve physical and mechanical properties of the paper,and natural dyes have also been added.Different formulations of cellulose pulp using natural extracts were evaluated.These pulps were characterized by the length of the cellulose fibers using the techniques of optical microscopy and scanning electronic microscopy (SEM) and the concentration of solids in the pulp by the gravimetric method.The drying of the paper was carried out in a convective dryer under drying controlled conditions such as temperature (70 oC,80 oC and 90 oC) and velocity of drying air (0,3 m/s,0,5 m/s and 0,7 m/s),according to a two-factor central factorial design of experiments.The drying curves obtained were analyzed and fitted to mathematical models of Fick,Page,Page modified (considering the nonlinear Fick effect),Henderson and Pabis (Fick’s modified equation) and Midilli’s model.The empirical kinetic models represented well the experimental data.
机译：本文旨在分析用姜黄植物（Curcuma longa）和胭脂虫（Dactylopius coccus）的天然提取物染色的手工再生纸的强制对流干燥。本研究旨在寻找废纸的新用途，以及除废纸以外的其他用途。巴西生产的天然染料，创造了可以由小型纸张回收合作社生产的新产品。用于生产再生纸的纤维素纤维的来源是用过的纸张（A4尺寸）印刷的。进行了浮选系统以除去墨粉通过添加乙醇和过氧化氢使纸浆颗粒破碎。除这些试剂外，还添加了木薯淀粉和羧甲基纤维素以改善纸张的物理和机械性能，还添加了天然染料。这些纸浆使用光学显微镜和扫描技术通过纤维素纤维的长度进行表征通过重量法测定纸浆中的固体浓度。在对流干燥机中，在温度（70 oC，80 oC和90 oC）和速度等干燥控制条件下进行纸的干燥干燥空气（0,3 m / s，0,5 m / s和0,7 m / s）的设计基于两因素中心因子设计实验。 Fick，Page，Page修改（考虑了非线性Fick效应），Henderson和Pabis（Fick的修改方程）和Midilli模型。经验动力学模型很好地代表了实验数据。

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  • 来源
  • 会议地点 Xiamen(CN)
  • 作者

    N.D.Lopez; S.B.Badra; M.L.Verzola; S.C.S.Rocha; M.G.A.Vieira;

  • 作者单位

    School of Chemical Engineering,Unicamp Av.Albert Einstein,500,Cidade Universitaria “Zeferino Vaz”,Campinas,13083-852,Brazil;

    School of Chemical Engineering,Unicamp Av.Albert Einstein,500,Cidade Universitaria “Zeferino Vaz”,Campinas,13083-852,Brazil;

    School of Chemical Engineering,Unicamp Av.Albert Einstein,500,Cidade Universitaria “Zeferino Vaz”,Campinas,13083-852,Brazil;

    School of Chemical Engineering,Unicamp Av.Albert Einstein,500,Cidade Universitaria “Zeferino Vaz”,Campinas,13083-852,Brazil;

    School of Chemical Engineering,Unicamp Av.Albert Einstein,500,Cidade Universitaria “Zeferino Vaz”,Campinas,13083-852,Brazil;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 空气处理;
  • 关键词

    drying modeling; convective drying; paper drying; paper recycling; turmeric; cochineal;

    机译：干燥模型;对流干燥;纸张干燥;纸张回收;姜黄;胭脂红;

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