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All Journal Dinamik IPTEK The Journal for Technology and Science Jurnal Teknik Kimia International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Raka Selaksa Charisma Muchammad
Chemical Engineering Department, Faculty Of Engineering And Science, Universitas Pembangunan Nasional “Veteran” Jawa Timur
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Study of Extraction Calophyllum inophyllum L using Microwave Hydrodiffusion Gravity And Chemical Extraction method Raka Selaksa Charisma Muchammad; Mahfud Mahfud; Lailatul Qadariyah
IPTEK The Journal for Technology and Science Vol 31, No 1 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (652.483 KB) | DOI: 10.12962/j20882033.v31i1.5629

Abstract

In this study, the oil extraction of Calophyllum inophyllum L using microwave hydro-diffusion gravity method and chemical extraction method were elaborated. The Microwave Hydrodiffusion Gravity (MHG) method is a new green technique which combines microwave-assisted technology and gravitation. It is used to produce oil yield faster and at a low cost. In comparison, a chemical extraction method is a conventional method. The raw material pretreatment, extraction time, microwave power, and the material size have become a crucial factor of extraction. In general, the MHG method yields a higher yield than the chemical extraction method. The MHG method is simple and less solvent. It requires faster extraction time and produces higher oil yield.
Mini-Review on Renewable Production of Green p-Xylene Muchammad, Raka Selaksa Charisma; Saputro, Erwan Adi; Rohmah, Aisyah Alifatul Zahidah
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.135

Abstract

The sustainable and renewable production of p-xylene (PX), a crucial component for polyethylene terephthalate (PET), is increasingly important as an alternative to fossil-based processes. This review examines biomass-derived routes for PX synthesis, emphasizing the use of bio-px production pathways to feasible for commercialization. While bio-PX production offers reduced greenhouse gas emissions, challenges remain in cost, catalyst stability, and energy requirements. Recent innovations in catalyst regeneration and hierarchical structures enhance stability and minimize coke formation. Life-cycle assessments confirm bio-PX’s environmental advantages, suggesting that further research into biomass sources and catalyst efficiency will advance bio-based PX production toward commercial viability in a sustainable bioeconomy.
Evaluasi Kinerja Cooling Tower CT-2211A-B Unit Utilitas Produksi IA PT Petrokimia Gresik Muchammad, Raka Selaksa Charisma; Nurmawati, Ardika; Saputro, Erwan Adi; Juwana, Krishna Rahmad; Handy, Febry Widiatniko; Pinandita, Indrawan
Dinamik Vol 30 No 1 (2025)
Publisher : Universitas Stikubank

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35315/dinamik.v30i1.9885

Abstract

Setiap industri membutuhkan air pendingin (cooling water) sebagai unit pendukung dalam proses produksinya, termasuk industri petrokimia yang memerlukan air pendingin (cooling water) agar proses produksinya dapat berjalan dengan lancar. Untuk meningkatkan serta menjaga penggunaan air pendingin (cooling water) , maka digunakan alat cooling tower yang berfungsi untuk me-recycle air kondensat menjadi air pendingin (cooling water) kembali. Penggunaan alat cooling tower ini dinilai sangat penting, sehingga diperlukan analisa evaluasi kinerja alat untuk mengetahui kondisi cooling tower dan mencegah kerusakan dikemudian hari. Evaluasi tersebut berdasarkan nilai efisiensi kerja serta termal cooling tower dan perhitungan neraca massa pada sistem cooling tower CT-22111 A-B. Analisa evaluasi ini dapat menjadi hal yang di pertimbangan oleh teknis pihak industri untuk melakukan perawatan lebih lanjut serta operasional. Dari Analisa data lapangan serta data pendukung didapatkan hasil aktual yang menunjukkan di mana cooling tower pada unit utilitas departemen produksi IA diperoleh sebesar 71% untuk desain dan 77% untuk aktual serta untuk efisiensi termal masih direntang 67% - 81% tidak terlalu berbeda dengan data desain untuk efisiensi termal. Dengan demikian, kinerja cooling tower menunjukkan bahwa masih beroperasi dengan cukup baik.
STUDY OF KINETIC MODELING FOR SEA WATER IMPURITIES REMOVAL (SO4) USING DISODIUM PHOSPHATE (NA2HPO4) AND CALCIUM CHLORIDE (CACL2) Pujiastuti, Caecilia; Rohmah, Aisyah Alifatul Zahidah; Muchammad, Raka Selaksa Charisma; Sumada, Ketut
Jurnal Teknik Kimia Vol 19, No 2 (2025)
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i2.5157

Abstract

Salt is an essential mineral for human life, typically containing NaCl along with various impurities such as Mg²⁺, SO₄²⁻, and K⁺. The production of industrial-grade salt can be achieved through chemical treatments to bind these impurities. This study aims to investigate the kinetics of Sulphate (SO4) precipitation in order to lower impurities concentrations in seawater (Mg²⁺, SO₄²⁻, and K⁺), which is used as raw material for salt production, by adding chemical agents disodium phosphate (Na₂HPO₄) and calcium chloride (CaCl₂), each at a concentration of 2N. The research was conducted using continuous stirred tank technology with a stirring speed of 100 rpm and a solution pH of 9. The kinetics of impurity reduction in seawater were simulated using mathematical formulations, specifically pseudo-first-order and pseudo-second-order models. The results indicated that the process achieved the best outcomes with the addition of SO₄ solution, resulting in the highest removal value of 757.86 mg/L compared to others. Additionally, this correlated with an R² value close to 1 for the second-order kinetics, specifically 0.9871.
Co-Authors Aisyah Alifatul Zahidah Rohmah Ardika Nurmawati, Ardika Erwan Adi Saputro Handy, Febry Widiatniko Juwana, Krishna Rahmad Ketut Sumada Lailatul Qadariyah Mahfud Mahfud Pinandita, Indrawan Pujiastuti, Caecilia