Abstract
In this study, sugarcane bagasse ash (SCBA) as waste from sugarcane factory was extracted into silica powder. This powder was then used as adsorbent for ethanol purification. Prior to used, the SCBA was washed using HCl solution. The silica extraction was conducted using various NaOH concentrations (0.5; 1; 1.5 and 2 mol/L) as well as extraction times (30, 60 and 90 minutes). After that the mixture was precipitated using HCl solution. The solution was filtrated through a paper filter and its solid particle was dried until its weight was constant. The particle was grounded and sieved using 18 mesh sieves. The silica powder obtained was analysed using FTIR and its result showed that the powder has silica functional groups. The silica yield increases with increasing of concentration of NaOH solution as well as extraction time. The highest silica yield (45.5% w/w) was achieved at 2 mol/L NaOH solution at 90 min. The surface area, pore diameter, and pore volume of silica powder were measured to be 407 m2/g, 3.81Å, and 2.76 dm3/g, respectively. From application of silica powder as adsorbent in adsorptive-distillation, ethanol concentration can reach 99.3% w/w which indicates azeotropic point can be passed.
Highlights
A sugarcane factory produces sugarcane bagasse ash (SCBA) as by-product
The silica powder produced was tested for characteristics of functional groups and surface area (m2/g), pore diameter (Å), and pore volume using Fourier Transform Infrared (FTIR) spectroscopy Perkin Elmer Spectrum Version 10.03. 06 and Brunauer, Emmet, Teller (BET) Quantachrome Nova 1200e
The production of silica tends to increase in line with NaOH concentration (0.5 to 2 mol/L) at all extraction times tested in this study
Summary
A sugarcane factory produces sugarcane bagasse ash (SCBA) as by-product. Indonesia’s sugarcane production reaches 2.6 tonnes in 2015 [1]. About 280 kg wet bagasse is produced from 1 tonne of cane processed [2]. Sugarcane bagasse used as boiler fuel will result in SCBA as waste (8-10% w/w). SCBA has high silica content (53.1% w/w) [3, 4]. The silica extraction process will produce silica crystal that can be used as hydrophilic adsorbent with surface area between 200800 m2/g [5]. The silica powder production process is performed through major steps: raw material preparation, silica extraction, and silica precipitation [6]. The operation condition to obtain the highest silica yield is at 600°C, 3 hours, and using 91.57% HCl solution [7, 8]
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