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CHEMICA Jurnal Teknik Kimia
Published by Universitas Ahmad Dahlan
ISSN : 2355875X     EISSN : 23558776     DOI : 10.26555
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy
CHEMICA Jurnal Teknik Kimia ISSN, 2355-875X (print) 2355-8776 (online) is a journal that publishes manuscripts or scientific papers in Chemical Engineering. The scope of this journal covers chemical reaction techniques, separation, optimization, process control, process system engineering, waste treatment, food and material technology. Journals are published in print and online twice a year, in June and December by Chemical Engineering Program, Faculty of Industrial Technology, Universitas Ahmad Dahlan Yogyakarta.
Arjuna Subject : -
Articles 189 Documents
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Biodegradable Plastic from Cassava and Organic Acid as a Synthetic Plastic Replacement Aji Ridho Pangestu; Raifa Tryas Shara; Zahrul Mufrodi
CHEMICA: Jurnal Teknik Kimia Vol 6, No 1 (2019): Juni 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i1.13721

Abstract

Currently plastic has been widely used for various purposes of packaging food and beverages. The use of synthetic plastic is increasingly then become a waste that cannot be degraded and pollute the environment. In Southeast Asia generates 379.198 million tons of plastic waste per year, meanwhile, Indonesia became the first contributor to the largest plastic waste producer which is 187.2 million tons per year. Biodegradable plastic can be an alternative the eco-friendly and easily degraded packaging materials as one way to replaced synthetic plastic. Cassava flour could utilized to make biodegradable plastic with cassava starch content reach 81.6 %. The addition of sorbitol plasticizer is as a giver of elastic properties to the material and chitosan as an amplifier and antimicrobial. The variation of weight ratio in gram that used is organic acids 50(1), 60(2), and 70(3). The variation of sorbitol are 3(A), 6(B), and 9(C). The variation of chitosan are 1(i), 3(ii), and 5(iii). The organic acids used are apple vinegar and rice vinegar with 2% acetic acid as a comparison. The research procedure begins with making cassava starch, making a film of biodegradable plastic, and sample testing. The film of biodegradable plastic has performed by tensile strength test analysis, elongation at break test, and biodegradable test. The results showed that the highest of percent biodegradable is on 2Ci with the results is 64.58%. The best of mechanical properties reached by using apple vinegar with the results of tensile strength is 105.98 kg/cm2 and elongation at break is 129.91%.
Ekstraksi Tanin dari Limbah Daun Teh pada Berbagai Suhu dan Waktu Itang Purnama; Jajang Gumilar; Kusmayadi Suradi
CHEMICA: Jurnal Teknik Kimia Vol 6, No 2 (2019): Desember 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i2.14724

Abstract

Green tea leaves old (camellia sinensis) is one of the agricultural waste products that has not been widely used and contains enough high tannin. This study aims to find the tannin content with qualitative and quantitative testing. The design used is a randomized block design with an extraction time of 30 minutes, 40 minutes, and a temperature of 60 °C, 70 °C, and 80 °C treatment repeated 4 times. The results showed that the highest tannin content obtained at the extraction time of 40 minutes at a temperature of 80 °C with a tannin content of 11.55%. The treatment that gave the best results obtained in 40-minute long treatment with a temperature of 70 °C with a tannin content of 10.90%, solubility 29.48% and a pH of 5.80.
Modifikasi Limbah Abu Layang menjadi Adsorben untuk Mengurangi Limbah Zat Warna pada Industri Tekstil Bachrun Sutrisno; Arif Hidayat; Zahrul Mufrodi
CHEMICA: Jurnal Teknik Kimia Vol 1, No 2 (2014): Desember 2014
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v1i2.3571

Abstract

Abundant supplies of coal make this compound as alternative fuels, especially for the industry. However, using of coal has shortcomings; incomplete combustion of coal produces solid waste that often called the fly ash. Results of mineral analysis showed that fly ash contain metal oxides such as silica (SiO2), alumina (Al2O3) and iron (Fe2O3). The presence of silica and alumina components allows fly ash to be synthesized into materials that have structure similar to zeolite. This material is known as zeolite like materials (ZLM).This study aims to synthesize ZLM of fly ash as adsorbent material. To determine the successful of synthesis also has been analyzed physicochemical properties of zeolite-like material. Then the results are used as adsorbent of textile dyes.The results showed that fly ash can be synthesized into zeolite-like material, this is indicated by the increasing of physicochemical properties. The experiment shown that the adsorption ability of fly ash in the reduction of textile dyes after modifiedis better.
Recent Catalyst Technology Development in Residue Catalytic Cracking Unit: A Mini Review Suhendra Suhendra; Zen Adi Laksana; Dhenok Widiastuti; Tita Griya Melyta
CHEMICA: Jurnal Teknik Kimia Vol 6, No 2 (2019): Desember 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i2.14810

Abstract

The use of fuel oil from year to year until now has experienced a rapid increase, due to increasing population growth in vehicle operations and the development of industries that require fuel. The position of renewable energy has not been able to shift the position of petroleum fuels to the needs of the world market. The RCC unit is secondary processing that converts heavy fraction hydrocarbons to light fraction hydrocarbons with the help of using catalysts into high-value petroleum products such as Naphtha, LPG, and Light Cycle Oil. RCC unit has three main parts of the process, namely riser, stripper, and regenerator, with the use of the main raw material of residue and using a catalyst. This paper aims at reviewing recent journals concerning the catalyst applied in the RCC unit. The basis of the RCC unit to be reviewed is from an existing RCC unit in Indonesia. The development of research on catalysts and regeneration technology in the RCC unit has experienced rapid development until now. It is expected that this paper can contribute to the future development and application of catalysts for the RCC unit, both for national and international levels.
Pengaruh Komposisi Gypsum Terhadap Setting Time Pada Proses Produksi Semen PCC Mala Hayati Nasution; Nevybryanti Bunga Nurcahyo Putri; Lukmilayani Candra
CHEMICA: Jurnal Teknik Kimia Vol 6, No 1 (2019): Juni 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i1.13804

Abstract

Cement is a national strategic commodity. Based on data from the Ministry of Industry of the Republic of Indonesia in 2017, the total installed capacity of the national cement industry is 92.7 million tons per year with a consumption rate of 65 million tons per year. The raw materials for the cement production process are limestone, iron sand, clay, silica sand, and gypsum. A comparison of the composition of each raw material influences the type and characteristics of the cement produced. Gypsum is a raw material that affects the quality of the final cement product. Gypsum acts to regulate the hardening time and inhibits the binding time so that it can be used for a long time. This research was conducted to study the effect of gypsum composition on setting time in the Portland Composite Cement (PCC) production process. Gypsum was Tanjung Jati gypsum. Variation of gypsum composition were 0-5% -weight.  Based on SNI 15-2049-2004, the minimum initial setting time is 45 minutes and the maximum final setting time is 375 minutes. Based on the results of the research, PCC cement with 0 - 5%--weight gypsum met these standards. Increased gypsum composition causes an increase in both initial and final setting time.
Engineering and Economic Evaluation Perspective in the Production of NiO Nanoparticles Friska Apriliana; Asep Bayu Dani Nandiyanto
CHEMICA: Jurnal Teknik Kimia Vol 6, No 2 (2019): Desember 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i2.14567

Abstract

Nickel oxide (NiO) nanoparticles have been proven and can be used in a variety of important applications. The purpose of this research was to evaluate the production process of NiO nanoparticles using the industrial co-precipitation method in terms of engineering and economic evaluation. Specifically, research was conducted by varying raw materials, product selling prices (GPM), equipment prices, and number of employees, which are compared with several economic parameters such as total investment cost (TIC), gross profit margin (GPM), break even point (BEP), payback period (PBP), net present value (NPV), and cumulative net present value (CNPV). The results showed that the PBP analysis showed that the investment would be profitable after more than 4 years with minimum product sales (GPM) of at least 90% and an increase in the price of raw materials no more than 15% of the ideal price. From this economic evaluation analysis, we can conclude that this project is feasible to run.
Optimalisasi Penggunaan Gipsum dan Batu Kapur pada Pembuatan Semen Putih Ahmad Riyanto; Devi Yuliani; Laeli Rizki Amalia; Erna Astuti
CHEMICA: Jurnal Teknik Kimia Vol 6, No 2 (2019): Desember 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i2.14629

Abstract

White Portland cement is a fine, gray or white powder, which consists of a mixture of hydraulic cement materials consisting mainly of calcium silicate, aluminate, and aluminoferrite. The manufacture of white portland cement requires special raw material requirements and manufacturing processes, such as raw materials containing very low iron oxides and manganese oxides. Various tests were carried out to obtain white cement of good quality and meet Indonesian National Standards or Standar Nasional Indonesia (SNI). The tests included raw material testing (Lost on Ignition test, LOI) on various compositions and LOI test, % SO3 test, and color test on white Portland cement. The results showed that the greater the % SO3, the strength of white Portland cement will decrease and the greater the LOI, the white Portland cement will be easily damaged. So from the results of the study obtained a good raw material composition for white Portland cement is 89% white slag, 4% limestone, and 7% gypsum. All test results meet Indonesian National Standards or SNI.
Validasi Metoda Analisa Kadar Logam Pb pada Rambut Karyawan SPBU jln. Juanda Kota Padang Dyna Putri Mayaserli; Retnowati Retnowati
CHEMICA: Jurnal Teknik Kimia Vol 6, No 1 (2019): Juni 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i1.13347

Abstract

Development in the health sector is the achievement of optimal public health degrees. People who are often exposed to air pollution, one of them is a gas station officer, for example lead metal (Pb). One of the objectives of this study was to determine differences in the cost (Pb) in the hair of gas station workers on Jl. Ir. Juanda is based on the length of the working period by using an experimental type of research to analyze Pb metal on gas station employees. The population and sample of the study were 3 gas station employees' hair containing 3 people. The sampling technique is based on the length of work. The results of this study found that the longer the employee's working period the higher the Pb level in the employee's hair and the percentage recovery value for the method of wet destruction using HNO3 and HCLO4 had an average recovery of 96.23% where the precision test was 4.01%. It is recommended that the next validation test use another method, namely dry destruction and review of parameters about age, place of birth date and lifestyle.
Pemisahan Hidrokarbon dalam Limbah Katalis Asam (Spent Acid) Proses Alkilasi Olefin dan Isoparafin dengan Proses Presipitasi Elda Melwita; Syukron Habibie; Abdul Apandi
CHEMICA: Jurnal Teknik Kimia Vol 6, No 2 (2019): Desember 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i2.14550

Abstract

Alkylation of olefin and isoparaffin produces spent acid waste containing high concentration of hydrocarbon. The content of sulphuric acid and hydrocarbon in spent acid put this waste into hazardous waste classification, therefore must be treated to avoid environmental pollution. Hydrocarbon separation can be carried out using precipitation. Two precipitation methods were applied to precipitate hydrocarbon, namely neutralization, and antisolvent precipitation. Neutralization was conducted using NaOH, CaCO3, and CaO. Meanwhile, antisolvent precipitation was performed using water. Precipitation of hydrocarbon using CaCO3 and CaO showed very satisfying results. On the other hand, NaOH was failed to precipitate hydrocarbon. Hydrocarbon was also precipitated using water as antisolvent at ratio of spent acid:water (g/ml) of 200.
Karakteristik Fisiko-Kimia Tepung Ubi Jalar Ungu dengan Proses Perendaman Menggunakan Asam Sitrat Imam Santosa; Acnes Meyta Puspa; Delvi Aristianingsih; Endah Sulistiawati
CHEMICA: Jurnal Teknik Kimia Vol 6, No 1 (2019): Juni 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v6i1.12061

Abstract

A study has been made in making purple sweet potato flour through the hydrolysis process using dilute citric acid. Sweet potatoes cut 3-5 mm, soaked in citric acid in various concentrations for a certain period, washed and drained. Sweet potatoes were then roasted at 70 degrees Celsius for 24 hours and then sieved with a mesh size of 200. The sieve results were analyzed for their physical, physicochemical content and compared with wheat flour. Soaking purple sweet potato using 0.01% citric acid produces purple sweet potato flour which is brightly colored, fine flour, decreasing the ash content with a very slight acid flour odor. The carbohydrate content of sweet potatoes is almost the same as wheat flour, and the fiber content of sweet potatoes is higher.

Page 12 of 19 | Total Record : 189

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