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Siswarni MZ

Departemen Teknik Kimia, Fakultas Teknik Universitas Sumatera Utara

Author-ID : 4065361

Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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PEMANFAATAN LIMBAH BATANG JAGUNG SEBAGAI ADSORBEN ALTERNATIF PADA PENGURANGAN KADAR KLORIN DALAM AIR OLAHAN (TREATED WATER) Fatimah Rahmayani; Siswarni MZ
Jurnal Teknik Kimia USU Vol. 2 No. 2 (2013): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Various result of agricultural waste that contain high cellulose can be used as an alternative adsorbent. One of them was derived from dried corn stalks which traditionally burnt after harvest that lead to environmental pollution. It is necessary to produce the value-added materials from corn stalks waste as an alternative adsorbent to reduce the level of chlorine in treated water. This process was performed by using various level of sulfuric acid concentration 1%, 3% and 5%, particles size 50 and 70 mesh in 105 oC with adsorbtion time 30, 60 and 90 minutes. The most favorable activation result was obtained at 5% concentration, with particle size 70 mesh, adsorbtion time 90 minutes and the iodine value was 482 mg/l with level of adsorbed chlorine was 96,08%. Based on this findings, we concluded that the corn stalks waste can be used as an alternative adsorbent in reducing the level of chlorine in treated water.

KAJIAN PEMANFAATAN BIJI KOPI (ARABIKA) SEBAGAI BAHAN BAKU PEMBUATAN BIODIESEL Bella Simbolon; Kartini Pakpahan; Siswarni MZ
Jurnal Teknik Kimia USU Vol. 2 No. 3 (2013): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

This research aims to exploit the coffee seed oil as raw material for biodiesel by esterification process, then followed by transesterification process and studied the influence of variations in the weight ratio of solvent: ground coffee beans in the coffee bean oil extraction process. The methodologies of this researchare conducted on the process of preparation of raw materials, extraction, and testing phase. Extraction is done with a variety of types of solvent n-hexane (C6H14) and toluene (C7H8 (C6H5CH3)) and a variety of solvents through a ratio of 1:5, 1:6, 1:7 and 1:8 against the mass of each run, which is 40 gram. Another variable is still 2 hours extraction time and temperature solvent extraction with n-hexane (C6H14) (boiling point 690C) is 70-75 0c and the solvent toluene (C7H8 (C6H5CH3))(boiling point 1100C) is 110-1150C. Testing phase is done bythe use of coffee oil esterification process in the molar ratio of methanol: free fatty acid catalyst H2SO4 = 3:1 with 1% v / v for 1hour with stirring 600 rpm and transesterification process at a molar ratio of methanol: oil = 9:1 coffee with 1.75% NaOH catalyst for 2 hours with stirring 600 rpm. Esterification process as conducted preliminary due to high levels of free fatty acids coffeeoils, which is 22.2%. Extraction results include the maximum yield of the coffee oils 17.73% in toluene weight ratio: coffee powder= 6:1, and coffee oil data in the form of the density 93.75 g / ml, viscosity 59.326 cP and fatty acid composition of the highest linoleic acid 40.8765% and palmitic acid 37.4492%. The results of esterification and transesterification obtained by the methyl ester equal to 39.63% with density 0.915 g / ml, 22.5498 cSt kinematic viscosity and flash point 130 0C.

EFFECT OF EPOXIDIZED NATURAL RUBBER AS A COMPATIBILIZER IN SILICA-FILLED STYRENE BUTADIENE RUBBER COMPOUND Indra Surya; Siswarni MZ
Jurnal Teknik Kimia USU Vol. 3 No. 2 (2014): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

By using a semi-efficient vulcanization system, the effect of Epoxidized Natural Rubber (ENR) as a compatibilizer in silica-filled Styrene Butadiene Rubber (SBR) compound was carried out. The ENR was incorporated into the silica-filled SBR compound at 5.0 and 10.0 phr. An investigation was carried out to examine the effect of ENR on cure characteristics and tensile properties of the silica-filled SBR compound. It was found that ENR gave enhanced cure rate to the silica-filled SBR compound. ENR also exhibited a higher torque difference, tensile modulus, and tensile strength up to 10.0 phr. The study of rubber - filler interaction proved that the addition of ENR to the silica-filled SBR system improved the rubber - filler interaction.

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