Sofi, Fikriyatus (2026) Pemisahan dan Identifikasi Struktur Asetin (Mono-, Di-, dan Tri-) Hasil Esterifikasi Gliserol dengan Etil Asetat Menggunakan KLT Preparatif dan Spektroskopi 1H NMR. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Peningkatan produksi biodiesel menyebabkan akumulasi gliserol sebagai produk samping dalam jumlah besar sehingga diperlukan upaya konversi menjadi produk bernilai tambah, salah satunya asetin (monoasetin, diasetin, dan triasetin). Pada penelitian ini dikembangkan metode sederhana untuk pemisahan dan identifikasi struktur asetin hasil transesterifikasi gliserol dengan etil asetat menggunakan kombinasi KLT preparatif dan spektroskopi 1H NMR. Sintesis
dilakukan pada perbandingan molar gliserol:etil asetat 1:10 menggunakan katalis H2SO4 10% mol gliserol selama 12 jam, menghasilkan produk asetin sebanyak 53,1772 g dengan rendemen 75,21%. Pemantauan reaksi menggunakan KLT menunjukkan terbentuknya monoasetin, diasetin, dan triasetin secara bertahap hingga gliserol habis bereaksi pada jam ke-12. Pemisahan dengan KLT preparatif menghasilkan tiga fraksi dengan nilai Rf berturut-turut 0,55 (monoasetin), 0,79 (diasetin), dan 0,91 (triasetin), serta %recovery masing-masing sebesar 33,22%, 23,86%, dan 10,65%. Hasil %recovery keseluruhan senyawa sebesar 67,73%. Karakterisasi 1H NMR mengonfirmasi keberadaan campuran isomer 1- dan 2-monoasetin pada fraksi 1, campuran isomer 1,2- dan 1,3-diasetin pada fraksi 2, dan fraksi 3 merupakan senyawa triasetin. Pola spektrum yang diperoleh tidak menunjukkan adanya campuran senyawa yang berbeda pada
masing-masing fraksi sehingga dapat mengonfirmasi keberhasilan pemisahan dan identifikasi senyawa asetin.
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The increase in biodiesel production has led to the accumulation of large amounts of glycerol as a by-product, necessitating efforts to convert it into value-added products, one of which is acetin (monoacetin, diacetin, and triacetin). In this study, a simple method was developed for
the separation and structural identification of acetins resulting from the transesterification of glycerol with ethyl acetate using a combination of preparative TLC and 1H NMR spectroscopy. The synthesis was carried out at a glycerol : ethyl acetate molar ratio of 1:10 using H2SO4 at
10% molar concentration of glycerol for 12 hours, yielding 53.1772 g of acetins with a 75.21% yield. Monitoring the reaction via TLC showed the gradual formation of monoacetin, diacetin, and triacetin until the glycerol was completely consumed at the 12-hour mark. Separation by preparative TLC yielded three fractions with Rf values of 0.55 (monoacetin), 0.79 (diacetin), and 0.91 (triacetin), respectively, and recovery percentages of 33.22%, 23.86%, and 10.65%,
respectively. The overall recovery percentage for the compounds was 67.73%. 1H NMR characterization confirmed the presence of a mixture of 1- and 2-monoacetin isomers in fraction 1, a mixture of 1,2- and 1,3-diasetin isomers in fraction 2, and triacetin in fraction 3. The obtained spectral patterns did not indicate the presence of mixtures of different compounds in each fraction, thus confirming the successful separation and identification of the acetin
compounds.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Gliserol, asetin, monoasetin, diasetin, triasetin,KLT preparatif, 1H NMR =========================================================== Glycerol, Acetin, Monoacetin, Diacetin, Triacetin, Preparative TLC, 1H NMR |
| Subjects: | Q Science > QC Physics > QC451 Spectroscopy Q Science > QD Chemistry Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry Q Science > QD Chemistry > QD305.A2 O73 Esterification Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas Q Science > QD Chemistry > QD481 Chemical structure. Q Science > QD Chemistry > QD75.2 Chemistry, Analytic |
| Divisions: | Faculty of Natural Science > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Fikriyatus Sofi |
| Date Deposited: | 04 Aug 2026 08:35 |
| Last Modified: | 04 Aug 2026 08:35 |
| URI: | http://repository.its.ac.id/id/eprint/143522 |
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