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Irwan, I
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ANALYSIS OF COAL QUALITY IMPROVEMENT USING CHEMICAL METHODS FOR MEETS STANDARDS OF CALORIFIC VALUE Nahar, N; Ridwan, R; Irwan, I; Pardi, P
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.5423

Abstract

As a country with relatively large coal resources and reserves, Indonesia will face challenges that are not easy in the future. The large amount of coal resources and reserves as well as the continuity of the coal mining industry cannot be ignored. Coal consumption in the world is expected to continue from time to time, especially in the Asian region. Lignite coal reserves account for around 48% of total coal reserves in the world, meanwhile in Asia lignite coal reserves reach 30%, while in Indonesia they reach 60% of total coal reserves. Although the amount of lignite coal consumed accounts for around 30% of total world coal production. The amount consumed in Asia accounts for only 10% of its total coal production. Especially in Indonesia, mining practices tend to tend to be higher quality bituminous and sub-bituminous coal which is more widely mined and produced because producing lignite coal is less economical and cannot meet market criteria. Thus, it can be predicted that what will remain in the future will be a large amount of lignite coal reserves that cannot be utilized. Because the opportunity to fill the potential of the coal market is still wide open, whether used directly as an energy source in power plants or exported abroad, promotion of the use of lignite coal must be made as early as possible as a very important issue for Indonesia. To improve the quality of lignite coal to coal whose quality is like that of anthracite coal so that it can be used, therefore it is necessary to have technology to improve the quality of lignite coal, so the Industrial Innovation Research research will improve the quality of coal using the stirring method by varying the influence of temperature and mixing time. coal, residual oil and kerosene can reduce the water content contained in low rank coal by the adsorption process. The research results show that operating conditions greatly influence the distribution of coal products. Relatively good operating conditions were obtained at a temperature of 200o C and a reaction time of 70 minutes with the results of: oil: 25 ml, water content: 0.668%, ash content: 11.883%, volatile matter: 30.122%, fixed carbon: 57.377%, and calorific value : 6581 Kcal/kg. Key words: Coal; Quality; Kerosene; Calorific Value; Enhancement
TESTING CHEMICAL ZINC PHOSPHATE BASE AS A CORROSION INHIBITOR ON CARBON STEEL IN THE CORROSION MEDIA OF COOLING WATER, SEA WATER AND PDAM WATER Sariadi, S; Kenady, Rengga Rahmat; Irwan, I; Zaini, Halim
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.5620

Abstract

Zinc phosphate base corrosion inhibitor which aims to determine the effectiveness of the inhibitor to provide protection to carbon steel against the rate of corrosion, with variations in inhibitor concentration at 0, 20, 40 and 60 ppm.This research uses the weight loss method and studies the performance of zinc phosphate base chemical inhibitors in the mediacooling water, sea water and PDAM waterThis is done by carrying out SEM (Scanning Electron Microscopy) testing. The type of steel specimen used in the research is Carbon Steel and deepCorrosion media are cooling water, sea water and PDAM water.The addition of zinc phosphate base carbon steel inhibitor is effective in reducing the corrosion rate of carbon steel in PDAM water and sea water. in sea water media without inhibitors, a drastic reduction in the corrosion rate was seen from 119.0457 mpy to 1.7754 mpy and in PDAM water media without inhibitors, a drastic decrease in the corrosion rate was seen from 18.5873 mpy to 3.4163 mpy, after adding inhibitors with a concentration of 60 ppm. The efficiency of the zinc phosphate base inhibitor in cooling water corrosion media was 30.262% at a concentration of 40 ppm and a soaking time of 20 days. Keywords :Inhibition efficiency, Corrosion Inhibitors, Corrosion in sea water, Corrosion in cooling water, Corrosion Rate, Zinc Phosphate base.
ANALYSIS OF COAL QUALITY IMPROVEMENT USING CHEMICAL METHODS FOR MEETS STANDARDS OF CALORIFIC VALUE Nahar, N; Ridwan, R; Irwan, I; Pardi, P
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6331

Abstract

ABSTRACT As a country with relatively large coal resources and reserves, Indonesia will face challenges that are not easy in the future. The large amount of coal resources and reserves as well as the continuity of the coal mining industry cannot be ignored. Coal consumption in the world is expected to continue from time to time, especially in the Asian region. Lignite coal reserves account for around 48% of total coal reserves in the world, meanwhile in Asia lignite coal reserves reach 30%, while in Indonesia they reach 60% of total coal reserves. Although the amount of lignite coal consumed accounts for around 30% of total world coal production. The amount consumed in Asia accounts for only 10% of its total coal production. Especially in Indonesia, mining practices tend to tend to be higher quality bituminous and sub-bituminous coal which is more widely mined and produced because producing lignite coal is less economical and cannot meet market criteria. Thus, it can be predicted that what will remain in the future will be a large amount of lignite coal reserves that cannot be utilized. Because the opportunity to fill the potential of the coal market is still wide open, whether used directly as an energy source in power plants or exported abroad, promotion of the use of lignite coal must be made as early as possible as a very important issue for Indonesia. To improve the quality of lignite coal to coal whose quality is like that of anthracite coal so that it can be used, therefore it is necessary to have technology to improve the quality of lignite coal, so the Industrial Innovation Research research will improve the quality of coal using the stirring method by varying the influence of temperature and mixing time. coal, residual oil and kerosene can reduce the water content contained in low rank coal by the adsorption process. The research results show that operating conditions greatly influence the distribution of coal products. Relatively good operating conditions were obtained at a temperature of 200o C and a reaction time of 70 minutes with the results of: oil: 25 ml, water content: 0.668%, ash content: 11.883%, volatile matter: 30.122%, fixed carbon: 57.377%, and calorific value : 6581 Kcal/kg.Key words: Coal; Quality; Kerosene; Calorific Value; Enhancement
PEMANFAATAN EKSTRAK DAUN TANJUNG SEBAGAI INHIBITOR KOROSI BAJA KARBON DALAM LINGKUNGAN GARAM KLORIDA Irwan, I
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.6364

Abstract

ABSTRAK Pengendalian korosi dengan menggunakan inhibitor merupakan salah satu metoda yang lebih murah untuk menghambat laju korosi dibandingkan dengan metoda yang lain. Penggunaan ekstrak daun tanjung sebagai inhibitor korosi untuk baja karbon dalam lingkungan garam klorida telah dilakukan di laboratorium menggunakan metoda perendaman dengan variasi konsentrasi ekstrak daun tanjung 1 ml/L, 2 ml/L, 3 ml/L, 4 ml/L, dan 5 ml/L dan waktu perendaman 4 hari, 8 hari, dan 12 hari. Hasil penelitian menunjukkan bahwa semakin tinggi konsentrasi ekstrak daun tanjung dan semakin lama waktu perendaman maka laju korosi semakin rendah. Efisiensi inhibisi mengalami peningkatan dengan peningkatan konsentrasi ekstrak daun tanjung dan waktu perendaman. Efisiensi inhibisi maksimum sebesar 95,85 % diperoleh pada konsentrasi ekstrak daun tanjung 5 ml/L dan waktu perendaman 12 hari.Kata kunci : ekstrak daun tanjung, inhibitor, korosi, metoda perendaman.
KOROSI BAJA TULANGAN BETON AKIBAT PENETRASI ION KLORIDA Irwan, I
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.6424

Abstract

ABSTRAK Korosi baja tulangan beton akibat penetrasi ion-ion klorida merupakan penyebab utama kerusakan struktur beton bertulang yang terpapar di lingkungan laut. Korosi baja tulangan dalam beton dimulai dengan larut/pecahnya lapisan pasif protektif akibat serangan ion-ion klorida yang menembus selimut beton hingga di permukaan baja tulangan. Perpindahan ion-ion klorida dari lingkungan ke dalam beton dapat berlangsung dengan mekanisme difusi, permeasi dan absorpsi kapiler.Kata Kunci: Korosi, Baja tulangan, Beton, Penetrasi ion klorida, Bentonite, Chitosan
TESTING CHEMICAL ZINC PHOSPHATE BASE AS A CORROSION INHIBITOR ON CARBON STEEL IN THE CORROSION MEDIA OF COOLING WATER, SEA WATER AND PDAM WATER Sariadi, S; Kenady, Rengga Rahmat; Irwan, I; Zaini, Halim
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6329

Abstract

ABSTRACT Zinc phosphate base corrosion inhibitor which aims to determine the effectiveness of the inhibitor to provide protection to carbon steel against the rate of corrosion, with variations in inhibitor concentration at 0, 20, 40 and 60 ppm.This research uses the weight loss method and studies the performance of zinc phosphate base chemical inhibitors in the mediacooling water, sea water and PDAM waterThis is done by carrying out SEM (Scanning Electron Microscopy) testing. The type of steel specimen used in the research is Carbon Steel and deepCorrosion media are cooling water, sea water and PDAM water.The addition of zinc phosphate base carbon steel inhibitor is effective in reducing the corrosion rate of carbon steel in PDAM water and sea water. in sea water media without inhibitors, a drastic reduction in the corrosion rate was seen from 119.0457 mpy to 1.7754 mpy and in PDAM water media without inhibitors, a drastic decrease in the corrosion rate was seen from 18.5873 mpy to 3.4163 mpy, after adding inhibitors with a concentration of 60 ppm. The efficiency of the zinc phosphate base inhibitor in cooling water corrosion media was 30.262% at a concentration of 40 ppm and a soaking time of 20 days.Keywords : Inhibition efficiency, Corrosion Inhibitors, Corrosion in sea water, Corrosion in cooling water, Corrosion Rate, Zinc Phosphate base.
STRATEGI PENGENDALIAN UNTUK MEMINIMALISASI DAMPAK KOROSI Irwan, I
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.6425

Abstract

ABSTRAK Korosi merupakan proses pengrusakan bahan akibat interaksi dengan lingkungannya yang terjadi secara alamiah dan tidak dapat dicegah namun dapat dikendalikan. Korosi menimbulkan kerugian secara ekonomi dan sosial baik langsung maupun tidak langsung dalam berbagai sektor. Besarnya kerugian akibat korosi mencapai 3 sampai 4 % dari GNP. Pengendalian korosi merupakan salah satu cara untuk mengurangi dampak korosi. Strategi pengendalian korosi dilakukan dengan dua pendekatan yaitu pendekatan non teknis dan teknis. Pendekatan non teknis lebih ditekankan pada perubahan pandangan, pemahaman, pola pikir, aturan-aturan di dalam masyarakat terhadap korosi dan pengendaliannya. Sedangkan pendekatan teknis lebih diutamakan untuk mengembangkan metodologi untuk memprediksi korosi, perbaikan praktek disain dalam manajemen korosi, dan pengembangan teknologi pengendalian korosi.Kata Kunci: Pengendalian Korosi, Dampak Korosi, Non-Teknis, Teknis.
PEMBUATAN MEMBRAN SELULOSA ASETAT DARI TANDAN KOSONG KELAPA SAWIT Putra, Alfian; Irwan, I
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6343

Abstract

ABSTRACT Membran selulosa asetat dapat dibuat dari Tandan Kosong Kelapa Sawit (TKKS), dengan mengkonversi TKKS menjadi pulp, dilanjutkan dengan pembentukan selulosa asetat yang akan dibuat menjadi membran. Proses pembuatan selulosa asetat dari pulp TKKS adalah dengan melakukan reaksi asetilasi selulosa, yaitu menggunakan asetat anhidrat dan asetat glasial. Metode yang digunakan adalah dengan cara inversi fasa. Kondisi optimum pada proses asetilasi didapat pada suhu 1000C dengan kadar selulosa asetat 61,4% dan kadar asetil 36,39%. Temperatur dan waktu pengadukan berpengaruh terhadap kekuatan tarik dan elongasi membran. Kekuatan tarik dan elongasi membran terbaik didapat pada kadar asetil 36,32% dengan kekuatan tarik 4,61 kgf/cm2 dan elongasi 5,23%.Kata Kunci: Pulp, asetil, inversi fasa, membran selulosa asetat.
Co-Authors Alfian Putra Halim Zaini, Halim Kenady, Rengga Rahmat Nahar, N Pardi, P R Ridwan Sariadi, S