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All Journal Jurnal Teknik Kimia USU

Rosdanelli Hasibuan

Departemen Teknik Kimia, Fakultas Teknik Universitas Sumatera Utara

Author-ID : 4065332

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

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PENENTUAN EFISIENSI INHIBISI KOROSI BAJA MENGGUNAKAN EKSTRAK KULIT BUAH KAKAO (Theobroma cacao) Sri Hermawan; Yuli Rizky Ananda Nasution; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 1 No. 2 (2012): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Cocoa peel extract is a natural inhibitor that can be used to inhibit the corrosion reaction rate. This research begins by extracting cocoa pods by maceration followed by evaporation on rotary vacuum evaporator and extracts used as the inhibitor with concentration 600, 800 and 1000 ppm, using steel 1 × 2 cm and the thickness is 0,1 cm to determine the corrosion rate and corrosive medias are sea water, rainwater and sulfuric acid 1 M . The highest inhibition efficiency generated is 93,06% with concentration of 600 ppm inhibitor in rainwater corrosive media; which means that cocoa peel extract more efficiently used in rainwater corrosive media.

PENENTUAN EFISIENSI INHIBISI REAKSI KOROSI BAJA MENGGUNAKAN EKSTRAK KULIT BUAH MANGGIS (Garcinia mangostana L) Yuli Rizky Ananda Nasution; Sri Hermawan; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 1 No. 2 (2012): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Garcinia mangostana peel extract is a natural inhibitor that can be used to inhibit the corrosion reaction rate. This research begins by extracting Garcinia Mangostana pods by maceration followed by evaporation and extracts used as the inhibitor with concentration 600, 800 and 1000 ppm, with the test sample of corrosion is steel 1 × 2 cm with the thickness is 0,1 cm and corrosive medias are sea water, rain water and sulfuric acid 1 M. The highest inhibition efficiency generated is 99,22% with ethanol solvent at concentration of 800 ppm inhibitor in rain water corrosive media; which means that Garcinia mangostana peel extract more efficiently used in rain water corrosive media.

PENENTUAN KONDISI OPTIMUM SUHU DAN WAKTU KARBONISASI PADA PEMBUATAN ARANG DARI SEKAM PADI Satriyani Siahaan; Melvha Hutapea; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 2 No. 1 (2013): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Charcoal is a solid porous material containing 80 - 90 % of carbon being produced from combustion at high temperatures (carbonization ), that the material only carbonized and not oxidized become carbon dioxide. The research is aimed to know the optimum conditions on the process of carbonization from the rice husks. The carbonization process conducted in temperatures 400 oC, 500 oC, and 600 oC with variations in time 30 minutes, 60 minutes, 90 minutes and 120 minutes. Optimum conditions carbonization for rice husk at temperature 400 oC for 120 minutes with a carbon content 41,3 %, moisture content 6,1 %, ash content 32,6 % and volatile matter content 20,5 %.

PENGARUH ASAM STEARAT TERHADAP SIFAT KETEGUHAN PATAH/MODULUS OF RUPTURE PAPAN PARTIKEL TERMOPLASTIK BEKAS BERPENGISI TEMPURUNG KELAPA Muh. Hendra S Ginting; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 3 No. 1 (2014): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

The utilization of former thermoplastic and coconut shell as particle board is one way to reduce plastic waste packaging, the ratio of the former as a thermoplastic matrix and coconut shells as fillers 60:40. Purpose of this study was to determine the effect of stearic acid on properties of modulus of rupture former thermoplastic particle board filler of coconut shell. Method of shell particle board manufacturing using the extruder, starting with the modification of coconut shell particles (size 80 mesh) with stearic acid (0 g, 3 g, 6 g and 9 g in 60 ml of ethanol ) and then dried in an oven at a temperature 70oC . Matrix and coconut shell ( 60:40 ) mixed in the extruder and then printed with hot press at a temperature of 170oC, until forming particle board with a size of 200 mm x 200 mm x 10 mm. Particle board analyzed the modulus of rupture in accordance with SNI 03-2105-2006. The results showed an increase in modulus of rupture properties. The modulus of rupture is 37.402 MPa greatest.

EKSTRAKSI KATEKIN DARI DAUN GAMBIR (Uncaria gambir roxb) DENGAN METODE MASERASI Desta Donna Putri Damanik; Nurhayati Surbakti; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 3 No. 2 (2014): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Catechins are a major components in the plant gambier. Beside catechins, there are several other components such as acid catechu tannat, quersetin, red catechu, gambier flouresin, fats and waxes. More than 80% of gambier production in Indonesia comes from the province of West Sumatra and North Sumatra, mainly in Limapuluh and Pakpak Bharat. Extraction of catechins from gambir leaf was performed by means of maceration that is soaking with a solvent polar. Maceration is carried out by temperature variations, 30°C, 40°C, 60°C and 80°C; maceration of time that is 1 hour, 6 hours, 12 hours, and 24 hours; and the type of solvent is aquadest, 96% ethanol, 95% ethyl acetate, and a mixture of 96% ethanol and 95% ethyl acetate (1:1). The results were filtered to obtain the filtrate which is then concentrated by rotary vacuum evaporator to test the levels of catechins, moisture content, and ash content. Based on this research the highest levels of catechins obtained the maceration temperature operating conditions of 60 ° C with a time of 6 hours maceration and used 95 % ethyl acetate as solvents in the amount of 87.14 % to 0.925 % moisture content and ash content of 0.04 % .

PENGARUH PENAMBAHAN GLISEROLTERHADAP SIFAT KEKUATAN TARIK DAN PEMANJANGAN SAAT PUTUS BIOPLASTIK DARI PATI UMBI TALAS Rinaldi Febrianto Sinaga; Gita Minawarisa Ginting; M. Hendra S Ginting; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 3 No. 2 (2014): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Bioplastics are a type of plastic made from renewable biomass sources, such as vegetable oil, corn starch, pea starch, and microbiota. Starch from tubers of talas (Colocasia esculenta) as a potential raw material for bioplastics by using glycerol as plastizicer. The purposes of the research are to know effect of adding glycerol to the properties of tensile strength and elongation at break bioplastic from starch taro tubers. In this research, the manufacture of bioplastics using casting methode with variations of starch solution (0,2 w/v, 0,3 w/v, and 0,4 w/v). The next additions to vary the volume of glycerol (1 % v, 2 % v, and 3 % v) and heating temperature of gelatin formation (60oC, 70oC, and 80oC). The results showed that bioplastics made from taro tuber starch has gelatinization temperature of 70oC. The addition of glycerol volume effect value of tensile strength and elongation at break of bioplastics. Increasing volume of glycerol will decrease tensile strength but increase elongation at break value. The best of bioplastics in this research is a variation of starch bioplastic 0,3 w/v, addition of 1 % v glycerol at a temperature of 70°C with a value of tensile strength is 18,4992 MPa and elongation at break value is 2,1290%.

Co-Authors Desta Donna Putri Damanik Gita Minawarisa Ginting Melvha Hutapea Muhammad Hendra S Ginting Nurhayati Surbakti Rinaldi Febrianto Sinaga Satriyani Siahaan Sri Hermawan Yuli Rizky Ananda Nasution

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