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PERVAPORATION TECHNOLOGY DEVELOPMENT FOR ABSOLUTE ETHANOL PRODUCTION (ETHANOL FUEL GRADE) Aswan, Arizal; Yuliati, Selastia; Junaidi, Robert
KINETIKA Vol 3, No 3 (2012): KINETIKA 01112012
Publisher : Teknik Kimia Politeknik Negeri Sriwijaya

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Abstract

Membrane pervaporation of ethanol vapor is a purification process based on grade with a purity level is high enough, so that the resulting product is called fuel grade ethanol. Fuel grade the process of increasing ethanol used as a fuel alternative. In this study the ethanol content is done by pervaporation technology method that utilizes a cellulose nitrate membrane separation media. Studies have been conducted on the effect of pressure on the value of the permeate flux and membrane selectivity in pervaporation process. Results showed that operating conditions at a temperature of 100 - 140oC, linear flow rate of 2.5 m3/ h, the variation of permeate side pressure of 500 mbar, 550 mbar, 600 mbar, 650 mbar and 700 mbar produces flux and selectivity values are declining. Optimum conditions reached at permeate side pressure is 700 mbar with the flux values 3.4673 x 10-5 Kg/m2.h and selectivity 0.1257. In these conditions the produce fuel grade ethanol yield reached 99.48%. Ethanol is converted into fuel feed grade reaches ± 99%, with a total volume of 193 ml of the feed volume 200 ml.
UNJUK KERJA ROTARY DRYER PADA PROSES PENGERINGAN BIJI KOPI Yuliati, Selastia
KINETIKA Vol. 9 No. 3 (2018): KINETIKA 01112018
Publisher : Politeknik Negeri Sriwijaya

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Abstract

The dryingprocess is an important step of drying coffee. At present there are mechanical dryer for drying of coffee, oneof them is a rotary dryer for finned heater, as a heat source.Rotary system in this study was used to dry the coffee beans to a minimum water content of 12%, according to the SNI standard, calculate the thermal drying efficiency, calculate the heat transfer coefficient, and calculate the drying rate. The test parameters in this study were drying temperatures varied from 30 ËšC to 70 ËšC and a drying time of 6.5 hours. The results of this study are the value of thermal efficiency obtained ranged from 68.8 - 79%, with a decrease in water content from coffee beans ranging from 25.2 - 11.98%. The value of the heat transfer coefficient in the rotary dryer device is 390.49 - 481.63 kJ / hour. m2oC. The value of drying rate is 1.75 - 2.06 kg / hour.m2 . From the results of calculations and analysis, the optimal drying temperature to desired SNI standards is found at a drying temperature of 70ËšC with a drying time of 390 minutes. The performance of the rotary dryer is very good with thermal efficiency values above 60%
RANCANG BANGUN TRAY DRYER SISTEM HYBRID (SURYA-HEATER) UNTUK PENGERINGAN IKAN ASIN Yuliati, Selastia; Kalsum, Leila; Junaidi, Robert; HC, Fadarina; Azizah, Roro Rizqi Ramadhani; Utami, Winda Andea; Ningrum, Galuh Martiyah
KINETIKA Vol. 11 No. 2 (2020): KINETIKA 01072020
Publisher : Politeknik Negeri Sriwijaya

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Drying process on salted fish is one of the factors that determine the quality of the products produced. Conventional drying has many weaknesses, namely fluctuating heat, poor hygiene and requires a large enough space and can affect product quality. One of alternatives in drying salted fish is using a hybrid system tray dryer with a solar energy source with additional electrical energy (heater). This study aimed to design a tray dryer with hybrid system (solar-heater), obtained the performanced of the dryer based on drying rate, heat transfer and heat efficiency of the hybrid system tray dryer (solar-heater), and obtained salted fish that met the water content standards based on SNI No. 01-2721- 2009. The treatments varied were drying time of 60 minutes, 120 minutes, 180 minutes, 240 minutes and 300 minutes and the variations of drying temperature of 60oC, 70oC and 80oC. The results showed that the optimum drying conditions were drying using temperature of 70oC with a drying time of 300 minutes, a moisture content of 31.2%, a drying rate of 0.1492 kg/hour m2, a conduction heat transfer rate is 52.01 J, a convection heat transfer rate is 71.15 J, a radiation heat transfer rate is 0.048 J and heat efficiency of 53.28%.
PENGOLAHAN AIR PAYAU MENJADI AIR BERSIH MENGGUNAKAN METODE ELEKTROKOAGULASI Kaslum, Leila; ., Fadarina; Meidinariasty, Anerasari; Yuliati, Selastia; Syakdani, Adi; Pratama, M.Bagas; Alpitansyah, Rachmad Bayu; Alnafrah, Fenty; Ismareni, Pepi
KINETIKA Vol. 12 No. 1 (2021): KINETIKA 01032021
Publisher : Politeknik Negeri Sriwijaya

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Abstract

The limitation of clean water resources in coastal areas is related to the scarcity of fresh water. Water that has too high a salinity can cause harm if it is used for certain activities, for example, it is dangerous for health when used as drinking water, causing crop failure for agriculture, corrosion for equipment and buildings made of metal elements. In order to be used as clean water and suitable for daily household use, brackish water needs special treatment with the aim of reducing the mineral content in it, especially in reducing salinity levels. For this purpose brackish water treatment has been made into clean water which works based on the electrocoagulation process. The performance test was carried out by filling 10 liters of brackish water into the electrocoagulation reactor and using an electric current of 10 volts, 12 volts and 14 volts for each test. The observation times for each test were 60, 120 and 180 minutes. Measurement of salinity, iron, sulfate and organic substances for each test was carried out using a potentiometer, atomic absorption spectrophotometer, turbidimeter, and titrimetry. The optimum results of the test show that the use of 14 volts of electricity and contact time for 120 minutes can reduce iron levels from 1.41 mg / l to 0.98 mg / l, and sulfate levels from 301.97 mg / l to 235.84 mg. / l, levels of organic substances from 3.05 mg / l to 2.25 mg / l and salinity levels from 16.25 ppt to 10.07 ppt.
RANCANG BANGUN ALAT TIPE SPRAY DRYER UNTUK PROSES PENGERINGAN SUSU BUBUK BERBASIS JAGUNG MANIS (Zea mays saccharata) Putri, Astri Oktaviana; Mentari, Inez Artemisia; Julyantiya, Robby Try; Yuliati, Selastia; Dewi, Erwana
KINETIKA Vol. 12 No. 3 (2021): KINETIKA 01112021
Publisher : Politeknik Negeri Sriwijaya

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Abstract

Drying is one of techniques used in food preservation. Spray Dryer is a type of dryer that can change the feed from a fluid state into granules and then convert again into particles which are dried continuously in hot drying media. Spray dryer uses liquid atomization to form droplets, then the droplets formed are dried using dry air with high temperature and pressure. This 31emperat aims to produce high quality corn porridge milk. The drying process is carried out by a batch process where the material is put into a spray dryer and the process is allowed for a certain period of time. The heat transfer process that occurs in this tool is the main variable to determine the efficiency and performance of the tool produced. The drying process of milk powder was carried out at a temperature of 150° C and 160°C in 75 minutes. Based on the analysis, the calculation of heat transfer rate, drying rate, and thermal efficiency obtained a powdered milk product of 0.8 grams with a convection heat transfer rate of 1.6924 kJ, a conduction heat transfer rate of 1.299 kJ, a drying rate of 31.594 kg / hour. And thermal efficiency of 35%.
Co-Authors ., Fadarina Alnafrah, Fenty Alpitansyah, Rachmad Bayu Anerasari Meidinariasty Arizal Aswan Azizah, Roro Rizqi Ramadhani Erwana Dewi HC, Fadarina Ismareni, Pepi Julyantiya, Robby Try Kalsum, Leila Kaslum, Leila Mentari, Inez Artemisia Ningrum, Galuh Martiyah Pratama, M.Bagas Putri, Astri Oktaviana Robert Junaidi Syakdani, Adi Utami, Winda Andea