1. Department of Chemical Engineering, Politeknik Teknologi Kimia Industri, Medan 20228, Indonesia
2. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia
3. Department of Palm Oil Agribusiness, Politeknik Teknologi Kimia Industri, Medan 20228, Indonesia
4. Department of Mechanical Engineering, Politeknik Teknologi Kimia Industri, Medan 20228, Indonesia