Abstract
The objective of this research was to synthesize natural anionic surfactant from renewable material and use of this surfactant for ink removal from printed paper via flotation deinking in paper recycling process. The work included the preparation of the castor seed raw material, extraction of castor oil, preparation of anionic surfactant and deinking flotation of waste printed paper. Foamability and foam stability, critical micelle concentration and hydrophilic lipophilic balance of the surfactant was characterized and used to evaluate its fundamental deinking ability properties for the purpose of deinking flotation. The hydrophilic-lipophilic balance (HLB) of the fatty acid soap of 19.48, average Foamability height of 49cm and critical micelle concentration (CMC) of 0.0065M was obtained. Lab scale flotation deinking process was done and the basic flotation parameters like flotation time, fatty acid soap dosage and pH were optimized for evaluating deinking efficiency. The flotation deinking efficiency was probed by measuring the residual ink concentration of the hand sheet via Perkin Elmer spectroscopy before and after deinking flotation. The individual and interaction effects between the basic parameters were studied by using design Expert Software 6.0.8. For the deinking flotation, the maximum ink removal efficiency was determined to be 78.02% at the flotation time of 90min, fatty acid soap dosage of 1.5% and pH of 9. Increasing flotation time from 30min up to 90 min and decreasing fatty acid dosage from 3% to 1.5% and increasing of pH from 3 up to 9 were found to have increased the ink removal efficiency.
Highlights
Paper is a sheet of fibers with a number of added chemicals that affect the properties and quality of the sheet
Preparation of Anionic Surfactant Sodium stearate of the molecular formula CH3 (CH2)16COO-Na+ is anionic surfactant used for flotation deinking purpose
Hydrophilic-lipophilic balance values describe how the surfactant interacts with water soluble and water repellent substances
Summary
Paper is a sheet of fibers with a number of added chemicals that affect the properties and quality of the sheet. In Ethiopia both the local produced and the imported paper met the demand of the society. Due to the existence of only one paper factory in the country, i.e. Ethiopian Pulp and Paper Factory located at Wonji, the majority of the supply is from import. C, the best supply offered by the domestic manufacturer was 12,685 tons while the yearly average consumption during the same period was 146,296 tons [1]. To avoid this shortage of paper in the country, it is necessary to recycle the waste paper by removing its ink and other dirties from the fiber
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