Garuda - Garba Rujukan Digital

p-Index From 2020 - 2025

P-Index

This Author published in this journals

All Journal Jurnal Teknik Kimia USU

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

Published : 6 Documents Claim Missing Document

Claim Missing Document

Articles

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.

EKSTRAKSI MULTI TAHAP KURKUMIN DARI KUNYIT (Curcuma domestica Valet) MENGGUNAKAN PELARUT ETANOL Rajian Sobri Rezki; Dwimas Anggoro; Siswarni MZ
Jurnal Teknik Kimia USU Vol. 4 No. 3 (2015): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Curcumin is a pigment in Curcuma domestica Valet, which has an orange-yellow crystal appearance, and commonly being used as a colouring agent. Extraction method which is used in extracting curcumin from Curcuma domestica Valet is one stage extraction. This research studied a multi stages extraction of curcumin from Curcuma domestica Valet. The purposes of this research is to find the best condition in extracting curcumin using multi stages extraction method, to increase the efficiency rate in curcumin extraction. This research used ethanol as a solvent, and effect from variables such as extraction time, solvent concentration, and number of extraction stages are observed. Extraction times are 60 minutes, 120 minutes, and 180 minutes. Variations of ethanol concentration are 50%, 70%, and 96%. Stage numbers of extraction are two stages extraction and three stages extraction. Extracts of curcumin are examined with qualitative analysis and quantitative analysis. The best condition of multi stages curcumin extraction is determined based on yield and content of curcumin. The maximum yield obtained in this study was 12% with conditions 180 minutes extraction time, 96% ethanol concentration, and two stages extraction. The highest content of curcumin obtained is 16% with conditions 180 minutes extraction time, 96% ethanol concentration, and three stages extraction. Content means a fraction of yield. These results show that increase in extraction time, solvent concentration, and stage numbers of extraction will increase the yield and content of curcumin extracted from Curcuma domestica Valet.

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.

EKSTRAKSI MINYAK DARI BIJI ALPUKAT (Persea Americana Mill) MENGGUNAKAN PELARUT N-HEPTANA Atikah Risyad; Resi Levi Permadani; Siswarni MZ
Jurnal Teknik Kimia USU Vol. 5 No. 1 (2016): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Avocado production is quite high in Indonesia led to increased waste avocado seed. Avocado seeds have an oil content large enough to potentially be used as a source of vegetable oil. A commonly used solvent for the extraction process is hexane. However, hexane proved to have an alarming danger if it is used for the extraction of food ingredients, necessitating alternative solvents such as n-heptane. This study was conducted to evaluate the effect of variable research on avocado seed oil extraction using n-heptane. The method used in this study is Response Surface Methodology-Central Composite Design (RSM-CCD) by varying the time of extraction, extraction temperature, avocado seed mass and volume of the solvent n-heptane. ANOVA with 95% confidence level (p <0.05) showed that the variables have a significant influence on the yield of avocado seed oil produced by the value of R2 = 94.24% at constant temperature and R2 = 93.95% at constant time. Characteristics of avocado seed oil is a orange color, density amounted to 0.71 g/ml, viscosity amounted to 0.43 cP, and FFA amounted to 2.76%. Analysis of fatty acid composition of avocado seed oil showed fatty acid component is predominantly polyunsaturated fatty acids as linoleic acid of 47.3531% (w/w), saturated fatty acids such as palmitic acid amounted to 20.3439% (w/w), and monounsaturated fatty acids as oleic acid amounted to 15.8823% (w/w).

PEMBUATAN KARBOKSIMETIL SELULOSA DARI KULIT PISANG KEPOK DENGAN VARIASI KONSENTRASI NATRIUM HIDROKSIDA, NATRIUM MONOKLOROASETAT, TEMPERATUR DAN WAKTU REAKSI Saputri Ayuningtiyas; Feni Dwi Desiyana; Siswarni MZ
Jurnal Teknik Kimia USU Vol. 6 No. 3 (2017): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Carboxymethyl cellulose (CMC) is a derivative cellulose which is soluble an in water (hydrophilic colloid). This material effective to bind water to provide a uniform texture and increase viscosity. The aim of this study is to utilize banana peel as a raw material to synthesis CMC and determine the best conditions in the process of synthesis CMC from banana peel. The materials used were banana peel, water, aquades, NaOH, Natirum monochloroacetat and glacial acetic acid. The variables in this study were NaOH concentration, natirum monochloroacetat mass, temperature and reaction time. In this research consists of four stages there are preparation of raw materials, alkalization, carboxymethylation, and neutralization. The results of this research shows the variatioon NaOH concentration 20% and temperature of 45oC degree, mol rasio of cellulose:sodium monochloroacetat 1:1,6 with a reaction time of 120 minutes obtained the highest substitution degree of 0,73-0.812. The FTIR analysis shows the presence of the O-H, C-H, C = O, C-0, CH2 and 1,4 β-glycoside function groups known to have the same function groups as the commercial carboxymethyl cellulose.

Co-Authors Atikah Risyad Bella Simbolon Dwimas Anggoro Fatimah Rahmayani Feni Dwi Desiyana Indra Surya, Indra Kartini Pakpahan Rajian Sobri Rezki Resi Levi Permadani Saputri Ayuningtiyas

Title

Found 6 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 6 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 6 Documents
Search