The Benefit of Cacao Peel’s Lignin as an Adhesive using Multi Function Extractor
University of Pembangunan Nasional “Veteran” Jawa Timur, Surabaya, Indonesia
Lignin of Cacao Peel can be used as lignin adhesive by cooking process with sodium hydroxide liquid in the multifunction extractor. The benefit of this study is to minimize the waste of cacao peel that is plentiful. Cacao peel was cleaned then dried and pounded. Powder of cacao peel (200 gr) was cooked with water at 70 °C for an hour and then leaked. Sodium hydroxide liquid 1000 mL is used in various concentration (%) ; i.e : 8,10,12 and 18 for different times (60, 90, 120 and 180 minutes). After that, the mixture of liquid and solid cooking was separated to get lignin and its deposit was disposed. The black liquor was added with water until it reached a pH of 8-9. The sedimentation process was then performed by adding Chloride acid 10 % until pH reached 2-3, during 8-10 hours. The Lignin formed is separated and dried. Lignin powder (5 gr) was mixed with 2.5 gr resorcinol and 10 mL of formaldehyde solution, agitated by adding NaOH 10% and 50 %, respectively, each of that 20 mL, until lignin gum is formed. The result showed that 600 mL of black liquor provided 29.8 gr lignin powder and lignin adhesive. It’s adhesive capacity is 3.54 kg/sq.Cm and the color is near to cacao peel’s color.
Key words: Cacao peel / black liquor / lignin adhesive
© Owned by the authors, published by EDP Sciences, 2016
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