scholarly journals Studi Pengaruh Adisi H2O Terhadap Konversi Alfa-Pinen Menjadi Terpineol Menggunakan Katalis H2SO4

2018 ◽  
Vol 1 (1) ◽  
pp. 38-43
Author(s):  
Mila Nurmila ◽  
Tatang Shabur Julianto ◽  
Dwiarso Rubiyanto

The study of addition H2O to the alpha-pinene conversion into terpineol using H2SO4 catalyst has been carried out. The conversion process carried out using a hydration reaction for 4 hours with the variation of the number of water. The mole ratio of alpha-pinene to water l:5, 1:10,1:15, 1:20,1:25. While the H2SO4 as catalyst concentration has equated to the concentration of alpha-pinene for all conditions. The mixture which are alpha-pinene, with varying amounts of water, sulfuric acid catalyst and a fixed cancentration equivalent to the concentration of alpha-pinene and acetone as media refluxed at a temperature of 80-85°C during 4 hours. Hydration products were analyzed using GC-MS ond GC instrument.The results showed that the ratio of alpha-pinene reaction conditions: water l:10, alpha pinene converting as much as 30,29% with selectivity terpineol products as much as 30,395%. 

2015 ◽  
Vol 8 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Olga V. Yatsenkova ◽  
◽  
Anna I. Chudina ◽  
Nikolay V. Chesnokov ◽  
Andrey M. Skripnikov ◽  
...  

Konversi ◽  
2016 ◽  
Vol 3 (2) ◽  
pp. 1
Author(s):  
Primata Mardina ◽  
Hendry Agusta Prathama ◽  
Deka Mardiana Hayati

Abstrak- Jerami padi merupakan salah satu limbah yang mengandung hemiselulosa yang salah satu komponen utamanya adalah pentosan. Pentosan dapat diubah menjadi furfural dengan suatu reaksi hidrolisis berkatalis asam. Penelitian ini bertujuan untuk mengetahui pengaruh waktu reaksi hidrolisis dan konsentrasi katalisator H2SO4 terhadap yield furfural dari jerami padi. Sintesis furfural dari jerami padi dilakukan dengan cara menghaluskan jerami padi, kemudian menghidrolisisnya dalam larutan asam sulfat dengan konsentrasi yang berbeda (1%, 3%, dan 5% v/v) dan dengan variasi waktu 1 jam, 2 jam, 3 jam, 4 jam, dan 5 jam. Cairan hasil hidrolisis didistilasi untuk memisahkan furfural dari larutan asam sulfat. Hasil penelitian menunjukkan bahwa yield furfural yang diperoleh dari hidrolisis jerami padi berbanding terbalik dengan konsentrasi katalisator asam sulfat dan waktu hidrolisis. Yield furfural tertinggi diperoleh pada konsentrasi katalisator asam sulfat 1% dan waktu hidrolisis 1 jam, yaitu 5,441 %. Kata kunci: jerami padi, hidrolisis, hemiselulosa, pentosa, furfural Abstract-Rice straws are one of the hemicellulose-contained wastes, which one of its main components is pentosan. Pentosan can be reacted into furfural with acid catalytic hydrolysis reaction. This research is intended to find out the effect of hydrolysis durations and sulfuric acid (H2SO4) catalyst concentrations towards yield of furfural from rice straws. The synthesis of furfural from rice straws is conducted by refined the rice straws, then hydrolyze it with different concentrations of sulfuric acid solution (1%, 3%, and 5% v/v) and with different durations of hydrolysis reaction (1 hour, 2 hours, 3 hours, 4 hours, dan 5 hours). This hydrolisis reaction produced liquid, which are distilled to separate furfural from sulfuric acid solution. The results of this research show the yield of furfural from rice straws hydrolysis is inversely proportional to sulfuric acid catalyst concentration and hydrolysis duration. The best yield of furfural was 5,441%, which obtained with 1% sulfuric acid catalyst concentration and 1 hour hydrolysis duration.Keywords: rice straws, hydrolysis, hemicellulose, pentosa, furfural


2011 ◽  
Vol 236-238 ◽  
pp. 334-340
Author(s):  
Hao Feng ◽  
Zhi Feng Zheng ◽  
Yuan Bo Huang ◽  
Yun Wu Zheng

The liquefaction of cellulose in the presence of phenol without or with sulfuric acid as catalyst was investigated. The liquefied products were characterized by GC/MS and FTIR. Results showed that reaction temperature and reaction time had obvious effects on liquefaction of cellulose. Sulfuric acid showed an excellent catalytic degradation. The chemical compositions of the liquefied products produced using sulfuric acid catalyst or not were almost identical, and the majority of the identified liquefied products were methylene bisphenol and its isomers. During the process of liquefaction, the degradation of cellulose and condensation polymerization occurred at the same time. The last liquefied products were greatly dependent on the reaction conditions.


2011 ◽  
Vol 236-238 ◽  
pp. 247-252
Author(s):  
Yuan Bo Huang ◽  
Zhi Feng Zheng ◽  
Ji You Gu ◽  
Yun Wu Zheng ◽  
Qing Li Qin ◽  
...  

The liquefaction of cellulose in the presence of phenol without or with sulfuric acid as catalyst was investigated. The liquefied products were characterized by GC/MS and FTIR. Results showed that reaction temperature and reaction time had obvious effects on liquefaction of cellulose. Sulfuric acid showed an excellent catalytic degradation. The chemical compositions of the liquefied products produced using sulfuric acid catalyst or not were almost identical, and the majority of the identified liquefied products were methylene bisphenol and its isomers. During the process of liquefaction, the degradation of cellulose and condensation polymerization occurred at the same time. The last liquefied products were greatly dependent on the reaction conditions.


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