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All Journal Eksergi: Chemical Engineering Journal Bulletin of Chemical Reaction Engineering & Catalysis Bulletin of Chemical Reaction Engineering & Catalysis
Ringgani, Retno
Chemical Engineering Department, Faculty Of Industrial Engineering, UPN Veteran Yogyakarta, Jalan SWK 104 (Lingkar Utara), Condongcatur, Yogyakarta || Indonesia Chemical Engineering Department, Faculty Of Engineering, Universitas Gadjah Mada, Jalan G
Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Kinetika Reaksi Isomerisasi α-pinene Retno Ringgani; Budhijanto Budhijanto; Arief Budiman
Eksergi Vol 13, No 1 (2016)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v13i1.1434

Abstract

Terpentin merupakan hasil hutan non kayu yang berasal dari pohon pinus. Terpentin diperoleh  dari hasil produk non kayu berupa getah pinus dengan kandungan tertinggi berupa α-pinene dengan cara didistilasi dan menghasilkan produk atas berupa terpentin dan produk bawah berupa gondorukem. Terpentin yang dipakai pada penelitian ini memiliki komposisi α-pinen 80,03 %, camphen 1,95%, β-pinen 2,78 %, ∆-caren 11,91% dan limonen 1,99%. Reaksi isomerisasi α-pinen merupakan reaksi paralel yang menghasilkan beberapa produk isomer, yaitu camphen, limonen,α-terpinen, γ-terpinen, dan terpinolen. Produk hasil isomerisasi α-pinen merupakan produk intermediate yang digunakan dalam industri farmasi, chemical fragrance, anti bakteri dan industri parfum. Pada penelitian ini, dipelajari reaksi isomerisasi α-pinen menggunakan katalis resin amberlyst 36. Reaksi isomerisasi α-pinen dilakukan pada reaktor batch berpengaduk dengan variasi suhu 70 - 1000C. Kinetika reaksi isomerisasi α-pinen dari terpentin didekati dengan reaksi order satu irreversible. Model kinetika yang diusulkan menunjukkan kesesuaian dengan hasil eksperimen baik. Dari hasil perhitungan diperoleh parameter faktor tumbukan (A) dan Energi Aktivasi (E) untuk masing-masing camphene, limonene, α-terpinene, γ-terpinene, terpinolene yaitu 0,825x105 dm.s-1; 0,0061x105 dm.s-1;0,0645x105 dm.s-1;0,0595x105 dm.s-1; 0,0645x105 dm.s-1 dan 27,93 kJ/mol; 19,67 kJ/mol; 18,53 kJ/mol; 19,25 kJ/mol; 4,28 kJ/mol.
Experimental and Kinetic Modeling of Galactose Valorization to Levulinic Acid Retno Ringgani; Muhammad Mufti Azis; Rochmadi Rochmadi; Arief Budiman
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 2 Year 2022 (June 2022)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.2.14032.451-465

Abstract

Levulinic acid, a versatile chemical building block, was derived from C6-sugar galactose using sulfuric acid as the catalyst. Galactose is monosaccharide of polysaccharides constituent that is mostly contained in third generation biomass, macro-microalgae. It currently receives high attention to be a source of renewable feedstock. The effect of temperature, catalyst concentration and initial substrate loadings were studied for 60 min, in the temperature range of 150–190 °C, acid concentration of 0.25–0.75 M and initial substrate loading of 0.05–0.25 M. The highest levulinic acid yield of 40.08 wt% was achieved under the following conditions: 0.05 M galactose, 0.75 M acid concentration, 170 °C temperature, and 40 min reaction time. The kinetic model was developed by first order pseudo-irreversible reaction. The results showed that the proposed model could capture the experimental data well. These results suggested that galactose, derived from macro- and micro-algae, can potentially be converted and applied for platform chemicals. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Experimental and Kinetic Modeling of Galactose Valorization to Levulinic Acid Retno Ringgani; Muhammad Mufti Azis; Rochmadi Rochmadi; Arief Budiman
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 2 Year 2022 (June 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.2.14032.451-465

Abstract

Levulinic acid, a versatile chemical building block, was derived from C6-sugar galactose using sulfuric acid as the catalyst. Galactose is monosaccharide of polysaccharides constituent that is mostly contained in third generation biomass, macro-microalgae. It currently receives high attention to be a source of renewable feedstock. The effect of temperature, catalyst concentration and initial substrate loadings were studied for 60 min, in the temperature range of 150–190 °C, acid concentration of 0.25–0.75 M and initial substrate loading of 0.05–0.25 M. The highest levulinic acid yield of 40.08 wt% was achieved under the following conditions: 0.05 M galactose, 0.75 M acid concentration, 170 °C temperature, and 40 min reaction time. The kinetic model was developed by first order pseudo-irreversible reaction. The results showed that the proposed model could capture the experimental data well. These results suggested that galactose, derived from macro- and micro-algae, can potentially be converted and applied for platform chemicals. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Co-Authors Arief Budiman Budhijanto Budhijanto Muhammad Mufti Azis Rochmadi Rochmadi