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All Journal Jurnal Teknik Kimia USU

Rosdanelli Hasibuan

Departemen Teknik Kimia, Fakultas Teknik, Universitas Sumatera Utara

Author-ID : 4065309

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

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Articles

PEMBUATAN BIOGAS DARI BERBAGAI LIMBAH CAIR PABRIK KELAPA SAWIT Irvan; Irma Suraya; Hari Tiarasti; Bambang Trisakti; Rosdanelli Hasibuan; Yoshimasa Tomiuchi
Jurnal Teknik Kimia USU Vol. 1 No. 1 (2012): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

The purpose of this research is to determine the effect of Fe level as trace metal on the quantity of biogas produced from the fermentation of palm oil mill effluent (POME). Materials used in this study included POME from one of the palm oil factories belong to PTPN IV, hydrochloric acid, sodium bicarbonate, and trace metal. Observed variables were volume of biogas, concentration of Fe in fermentor, rate of degradation total solid (TS) and volatile solid (VS), and CO2at Hydraulic Retention Time (HRT) 6 days. Before HRT of 6 days reached, initial trace metal composition of Fe added were 25.2 mg / L, Co 0.42 mg / L and Ni 0.49 mg/ L. After that, composition of trace metal were consisted only Co and Ni. The results of this study showed that Fe as a trace metal did not affect the production or quantity of biogas and concentration Fe on level > 330 mg/L decreased the value of CH4, total solid (TS) and volatil solid (VS). Thus, Fe in the trace metal is no longer required if there is a high content of Fe in POME because it can be toxic for microorganism in the fermentation of biogas.

PEMANFAATAN FLAVONOID EKSTRAK DAUN KATUK (Sauropus androgynus (L) Merr) SEBAGAI ANTIOKSIDAN PADA MINYAK KELAPA Indah Cikita; Ika Herawati Hasibuan; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 5 No. 1 (2016): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

In this research, the katuk leaves (Sauropus androgynus (L) Merr) extracted for get flavonoid which used as antioxidant for the coconut oil. This research aims to determine the effect of the extraction time, the volume of the solvent, and the type of solvent for the yield and total flavonoid concentration of the katuk leaves extract and then to determine the effect of total flavonoid concentration and contact time the flavonoid of katuk leaves extract as antioxidants in coconut oil. The process used is extraction of katuk leaves used the solvent such as ethanol, n-heksana and etil asetat then extract will be analysed the yield and total flavonoid concentration of the katuk leaves extract. Then extract with the total flavonoid concentration 6,668%, 7,748% and 27,909% was used as a sample and contacted in the coconut oil with the contact time of 2, 4 and 6 days. Then, analysis is done of the coconut oil is the acid number, the iodine number and the peroxide number. The result obtained in this research is the best extraction time of 6 hours with solvent volume of 1250 ml with the best type of solvent is ethanol, the yield of extract is 0,243% and total flavonoid concentration is 27,909%. The total flavonoid concentration increasing cause a decrease the acid number, the iodine number increase and decrease the peroxide number which proved that katuk leaves extract can be used as antioxidants in the coconut oil with the best result is the total flavonoid concentration in 27,909% where the acid number is 0,962 mg KOH/g, the iodine number is 38,705 g I2/100 g and the peroxide number is 13,333 Meq/kg. The contact time of flavonoid in the coconut oil which increasing cause oil properties is getting worse but the results are better than the oil without the addition of extract.

PEMBUATAN BRIKET DARI KULIT KAKAO MENGGUNAKAN PEREKAT KULIT UBI KAYU Rosta Natalia Sinaga; Rosdanelli Hasibuan
Jurnal Teknik Kimia USU Vol. 6 No. 3 (2017): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

This study aims to determine the effect of temperature variation carbonization, carbonization time and adhesive variation to charcoal characteristics of cocoa skin using cassava skin adhesive. Briquette is usually made using binder. Binder can embed charcoal each other to form strong and compact briquettes. Some other variables beside binder that influence the quality of briquettes include raw material, compacting presseure and carbonization process. This research used cocoa leather as raw material with cassava skin leaves as binder. All variables affect the content of fixed carbon of the briquettes that influence the caloricvalue of the briquettes. The caloricvalue is the most important factor for determining the quality of the briquettes. In this research, the highest caloricvalue of the briquettes was 4.375 cal/g. It was achieved when cocoa leather were carbonized by method 1 with compaction pressure of 85 kg/cm2 and binderconcentration of 15% where as raw material with particle size of 100 mesh. The caloricvalue of the briquettes was still very low and did not meet the qualification of Indonesian standard for briquettes. Based on the strength test, cassava skin leaves couldn’t be used as briquette’s binder. The produced briquettes that used cassava skin leaves as binder had soft structure and easily destroyed.

PENGARUH SUHU REAKSI, KECEPATAN PENGADUKAN DAN WAKTU REAKSI PADA PEMBUATAN SABUN PADAT DARI MINYAK KELAPA (Cocos nucifera L.) Rosdanelli Hasibuan; Fransiska Adventi; Rahmad Parsaulian Rtg
Jurnal Teknik Kimia USU Vol. 8 No. 1 (2019): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Soap is a cleanser made by chemical reactions between sodium hydroxide or potassium hydroxide with fatty acids from vegetable oils or animal fats. Soaps can be made by several methods, namely saponification and neutralization methods, in this study carried out by saponification method. In the saponification method there are several problems namely operating conditions which include reaction temperature, stirring speed and stirring time. Therefore, need to do research to determine the best conditions of saponification reaction, namely reaction speed, operating temperature and reaction time using an impeller type multiple pitch blade turbine with research variables reaction temperature 60 oC, 70 oC, and 80 oC, stirring speed 300 rpm,400 rpm and 500 rpm and reaction time of 45minutes, 60 minutes, and 75 minutes. Saponification reaction is carried out by heating coconut oil and inserting 30% NaOH slowly and then stirring with a multiple pitch blade stirrer. The product will be analyzed by testing alkaline levels, moisture content and pH of the soap. The best operating conditions obtained from this study were at a temperature of 70 oC, reaction time of 60 minutes, stirring speed of 400 rpm with a pH value of 9.4 and an alkaline level of 0.073 and a moisture content of 9.8.

EFEKTIFITAS JENIS DESIKAN DAN KECEPATAN UDARA TERHADAP PENYERAPAN UAP AIR DI UDARA Rosdanelli Hasibuan; Ivo Dian Sari Marbun
Jurnal Teknik Kimia USU Vol. 7 No. 1 (2018): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Dry air is widely used in many fields, but the excessive water vapor in the air will make some problem and should be minimized to get the required dry air. The purpose of this research to observe the effect of air velocity and various of desiccants on the absorption of water vapor in the air on the tray dryer. The process of absorption of water vapor in the air performed with variations of the normal air velocity, 1.2 m/s, 2.3 m/s, and 3.6 m/s or volumetric rate of 0.059 m3/s; 0.113 m3/s; 0.178 m3/s and the type of desiccant of silica gel, alumina, and zeolite. Adsorption of water vapor in the air by desiccant was done by weighing the mass of desiccant before and after being crossed by air every interval of 60 minutes for 3 hours. Humidity measurement are performed on the upstream and downstream of the tray dryer to obtain a decrease in air humidity. The highest moisture adsorption using silica gel was obtained at velocities of 2.3 m/s and 3.6 m/s with adsorption of 0.266 grams water vapor / grams adsorbent and 0.264 grams water vapor / grams adsorbent as well as humidity of final air of 0.0194 kg water vapor/ kg dry air and 0.0198 kg water vapor/ kg dry air . The highest adsorption of water vapor using alumina was obtained at velocities of 2.3 m/s and 3.6 m/s with adsorption of 0.147 grams water vapor / gram adsorbent and 0.140 grams water vapor / gram adsorbent and the final humidity of 0.0207 kg water vapor / kg dry air and 0.0194 kg water vapor / kg dry air and the highest water vapor adsorption using zeolite was obtained at 3.6 m/s with the adsorption capacity of 0.130 grams water vapor / grams adsorbent and the final humidity of 0.0193 kg water vapor / kg dry air. Silica gel was the best desiccant in the process of moisture adsorption in air compared to alumina and zeolite.

Co-Authors Bambang Trisakti Fransiska Adventi Hari Tiarasti Ika Herawati Hasibuan Indah Cikita Irma Suraya Irvan Ivo Dian Sari Marbun Rahmad Parsaulian Rtg Rosta Natalia Sinaga Yoshimasa Tomiuchi

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