Document Type : Research Paper

Authors

• Mohammad Ahmadi ¹
• Mohammad mehdi Faezipoor ²
• Ahmad Jahan latibari ³
• Sahab Hejazi ⁴

¹ M.Sc , Wood and Paper Science, College of Natural Resources, University of Tehran

² prof., wood and paper science and technology, College of Natural Resources, University of Tehran

³ Associate Prof. Wood and paper science and technology Dept. Islamic Azad University, Karaj Branch

⁴ Assistant Prof, Wood and paper science and technology, College of Natural Resources, University of Tehran

Abstract

Neutral sulfite semi chemical pulping of Canola residues has been investigated. Canola residues collected from research farm at Agriculture and Natural Resources, University of Tehran, in Karaj. Chemical composition of Canola residues including cellulose, lignin, extractives soluble in ethanol-acetone and ash were determined using relevant TAPPI standard test methods. Fiber dimensions of Canola residues were also measured. Then neutral sulfite semi chemical pulps were produced from Canola residues applying following conditions: Cooking time at 3 levels(20,40,60min),chemical charge at 5 levels(8,10,12,14,16 %), Cooking temperature was kept constant for all cooks at 175ċ , Na₂SO₃ to Na₂CO₃ ratio was 3:1,and liquor to Canola residues at 8:1. Each pulping was repeated tree times. At the end of each cooking, initial defibration was carried out using a laboratory disc refiner. Total yield before defibration and yield after defibration and screened yield were determined.  The highest yield (72%) was obtained at treatment combination of  and the lowest yield (58.7%) was in treatment of .Both factors, time and chemical charge, had significant effect on yield and increasing these two factors caused lower yield.

Keywords

• Canola residues
• Neutral Sulfite Semi Chemical
• total yield
• screened yield
• pulp

Main Subjects

• Pulp and paper