Two-Step Soda Pulping Process of Rice Straw for The Recycle Papermaking

Sapei, Lanny and Purwanto, Edy and Suseno, Natalia (2014) Two-Step Soda Pulping Process of Rice Straw for The Recycle Papermaking. In: PROCEEDING BALI INTERNATIONAL SEMINAR ON SCIENCE AND TECHNOLOGY (BISSTECH) II 2014. Fakultas Teknik UPN "Veteran" Surabaya, Surabaya.

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The demand of papers is increasing with the population increase. This will definitely increase the need of wood fibers as the main raw material. However, due to the wood shortages, there have been many attempts to use non-wood fibers as substitutes for papermaking. Rice straw is abundantly produced in Indonesia as one of byproducts of rice milling. In this experiment, delignified rice straw was mixed with used paper in order to make recycle papers with acceptable properties. Two-step soda pulping process of rice straw was carried out to remove out lignin. First delignification was conducted using 7% NaOH at 70oC for 1 hour. NaOH concentrations (4%, 6%, 8%) and temperatures (40-80oC) were varied during the second pulping process. The tensile strength of resulting pulp was increased with the increase of NaOH concentration and temperature until the optimum condition and then decreased. The optimum condition was achieved at the NaOH concentration of 6% and temperature of 50oC. Tensile strength, water uptake and kappa number obtained on this optimum condition were 4.641 N/mm2; 0.0184 g/cm2; and 10.02, respectively. Two-step soda pulping process improved the quality of recycle paper in terms of mechanical properties, water resistance.

Item Type: Book Section
Uncontrolled Keywords: soda pulping, tensile strength, water uptake, kappa number
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Eko Setiawan 194014
Date Deposited: 11 Sep 2014 07:21
Last Modified: 24 Mar 2021 14:54

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