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Your search keyword '"Syed Ismail, Sharifah Nafisah"' showing total 10 results
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9. Epoxidation of Palm Oil Catalyzed by Titanium-Grafted Silica Catalyst

Author

Mohamed Rahmah, Yhaya Firdaus, Ahmad Faiza Mohd, Syed Ismail Sharifah Nafisah, Dzaraini Kamarun, and Fauzi Roslinda

Subjects
chemistry.chemical_compound, Hydrolysis, Degree of unsaturation, Materials science, chemistry, Batch reactor, General Engineering, Organic chemistry, Organic synthesis, Nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, Hydrogen peroxide, Catalysis
Abstract

Epoxidation reaction is an important reaction in organic synthesis because the formed epoxides are intermediates that can be converted to a variety of products. Catalytic palm oil epoxidation using titanium-grafted silica, hydrogen peroxide, and peroxoformic acid was carried out at 60 °C in a fixed batch reactor. Titanium-grafted silica with different percentages of silica content was prepared through sol-gel hydrolysis and was utilized in epoxidation of palm oil. Titanium-grafted silica particles and Epoxidized palm oil were characterized by techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscope (FESEM) and Nuclear Magnetic Resonance (NMR). The TiOSi bonds were detected at 960 cm-1in Ti-Si 0.5 and exhibited highest yield of epoxidized palm oil (EPO) in the epoxidation process which is 84% conversion of unsaturation in palm oil to epoxy groups. New peaks observed in the range of δ 2.4 ppm to 3.6 ppm in the NMR spectrum of EPO belong to protons of the epoxy cyclic ring group, CH-O-CH confirming successful epoxidation of palm oil using the prepared catalyst.

Published
2013

10. PALF/Skin Extracted Pineapple Juice: New Potential as Pulping and Bleaching Agent in Papermaking and Its Effect on Mechanical and Physical Properties.

Author

Jamal, Siti Noorashikin, Abdul Rahman, Wan Aizan Wan, Majid, Noor Aishatun, and Syed Ismail, Sharifah Nafisah

Subjects
PINEAPPLE juice, EXTRACTION (Chemistry), PULPING, BLEACHING (Chemistry), PAPERMAKING
Abstract

Pineapple has been known for a number of beneficial biological activities such as anti-oxidative and antibrowning. Some of these bioactivities are contributed by enzymatic complex in pineapple and it can be found mainly in the skin extracted pineapple juice. The purpose of this study is to determine the effect of the pineapple juice as a pulping and bleaching agent in the process of papermaking. During pulping of pineapple leaf fibre, the mixture of pineapple juice/water was added together with a constant amount of 3% Sodium Hydroxide (NaOH) at various concentration of pineapple juice (0%, 20%, 40%, 60% and 80%). Pineapple leaf fibre (PALF) was soaked several times with pineapple juice and NaOH during pulping and bleaching process in order to get the optimum results of the paper sheet obtained. The mechanical and physical properties of paper sheet were studied by measuring its tensile strength, tear resistance and water absorption. Comparatively, paper sheet produced from NaOH pulping shows better mechanical and physical properties than the mixture pulping of NaOH and pineapple juice. Additionally, pulping with higher concentration of pineapple juice tends to give long fibre rather than short fibre. Overall, the results of this study can be used as an alternative way in the production of paper and it also opens a door to utilize wisely the waste residue of pineapple in other sectors. [ABSTRACT FROM AUTHOR]

Published
2018
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