Precipitated Silica from Sodium Silicate by CO₂ on Fixed Bed Column

Abstract

The precipitated silica prepared by reaction of sodium silicate and gas CO2 on fixed bed column have been production successfully. In this study, silica from bagasse was extraction by sodium hydroxide 2N solution to produce sodium silicate solution. The sodium silicate solution was dilute by demineralize water to produce some concentration in the range of 0.33-0.98 %SiO2. Fixed bed column has a diameter of 7.5 cm with a height of 50 cm and a pH control apparatus. CO2 gas and sodium silicate liquid are both flowed from under of the column with a specified flow rate. The precipitate process was carried out on a fixed bed column with high of bed in the range of 10-30 cm. The effect of silica concentration and the high of the bed on the characterize of the precipitated silica product have been studied. The precipitated silica product characterized by XRF, XRD, SEM-EDX and BET. The quality of precipitated silica produced in the range concentration of 95-98 w% SiO2, surface area (BET) in the range of 46.1 – 58.8 m2/g.

Bubble formation phenomenon on the absorber column for CO2 absorption and to produce precipitated silica sodium carbonate

“…9 In previous studies, it was also found that the pH of sodium silicate aqueous solution decreased as the absorbed CO 2 increased. 21,22 It can be stated that the CO 2 absorption experiment with codes A, B, and C for 5 min performed with 2% v sodium silicate aqueous solution was less than optimal. Even though the small bubbles are evenly distributed, the CO 2 barely reacts with the sodium silicate solution; as a result, there is still a lot of gas that escapes from the surface of the liquid.…”

CO2 Capture using Sodium Silicate Solution in a Packed Bed Column

“…In addition to TEOS sodium silicate is commonly used as an ingredient for the production of mesoporous silica and silica aerogels [11,12]. The packed columns with cylindrical packing for silica precipitation have been studied previously [13]. This experiment uses spherical packing with a focus on the absorption of CO2 into * Corresponding author : sriemuljani.tk@upnjatim.ac.id sodium silicate solution by controlling the gas flow rate.…”