Vol. 6 No. 2 (2023)

Research Articles

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  Catalyst Lifetime Analysis for High-Temperature Shift Converter (104-D1) at Urea Factory

  DOI : 10.25273/cheesa.v6i2.15986.76-84

  Rahmatullah Rahmatullah ⁽¹⁾, Rizka Wulandari Putri ⁽²⁾, Bobi Mahendra ⁽³⁾, Hegar Tifal Arofi ⁽⁴⁾, Cecep Sumiratna Hadi ⁽⁵⁾

  (1) Universitas Sriwijaya, Indonesia ,

  (2) Universitas Sriwijaya, Indonesia ,

  (3) Universitas Sriwijaya, Indonesia ,

  (4) Universitas Sriwijaya, Indonesia ,

  (5) PT. Pupuk Sriwidjadja Palembang, Indonesia

  76-84

  Abstract : 119

  DOWNLOAD PDF : 105

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  DOI : 10.25273/cheesa.v6i2.15986.76-84
• 

  The Effect of NaOH Concentration and Acetylation Time on Synthesis of Kepok Banana Peel Cellulose Acetate

  DOI : 10.25273/cheesa.v6i2.17294.85-94

  Fia Kharisma Yasmin ⁽¹⁾, Ayu Pramita ⁽²⁾, Dodi Satriawan ⁽³⁾

  (1) Politeknik Negeri Cilacap, Indonesia ,

  (2) Politeknik Negeri Cilacap, Indonesia ,

  (3) Politeknik Negeri Cilacap, Indonesia

  85-94

  Abstract : 44

  DOWNLOAD PDF : 26

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  DOI : 10.25273/cheesa.v6i2.17294.85-94
• 

  Effect of EDTA Addition on Acidizing Treatment Process

  DOI : 10.25273/cheesa.v6i2.15647.95-104

  Reno Fitriyanti ⁽¹⁾, M.M. Lanny W. Pandjaitan ⁽²⁾, Lukas Lukas ⁽³⁾, Gilang Bagaskara Harlis ⁽⁴⁾, Agus Wahyudi ⁽⁵⁾, Muhrinsyah Fatimura ⁽⁶⁾

  (1) Universitas PGRI Palembang, Indonesia ,

  (2) Universitas Katolik Indonesia Atma Jaya, Indonesia ,

  (3) Universitas Katolik Indonesia Atma Jaya, Indonesia ,

  (4) Universitas PGRI Palembang, Indonesia ,

  (5) Universitas PGRI Palembang, Indonesia ,

  (6) Universitas PGRI Palembang, Indonesia

  95-104

  Abstract : 36

  DOWNLOAD PDF : 56

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  DOI : 10.25273/cheesa.v6i2.15647.95-104
• 

  Optimization of Chromium (VI) Adsorption using Microalgae Biomass (Spirulina sp.) and its Application in Leather Tannery Waste

  DOI : 10.25273/cheesa.v6i2.16315.105-117

  Nais Pinta Adetya ⁽¹⁾, Uma Fadzilia Arifin ⁽²⁾, Emiliana Anggriyani ⁽³⁾, Laili Rachmawati ⁽⁴⁾

  (1) Politeknik ATK Yogyakarta, Indonesia ,

  (2) Politeknik ATK Yogyakarta, Indonesia ,

  (3) Politeknik ATK Yogyakarta, Indonesia ,

  (4) Politeknik ATK Yogyakarta, Indonesia

  105-117

  Abstract : 72

  DOWNLOAD PDF : 40

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  DOI : 10.25273/cheesa.v6i2.16315.105-117
• 

  Optimization and Characterization of Adsorbent from Palm Kernel Shell Waste Using H3PO4 Activator

  DOI : 10.25273/cheesa.v6i2.15906.118-125

  M. Julian Herlambang ⁽¹⁾, Adityas Agung Ramandani ⁽²⁾, Devy Cendekia ⁽³⁾, Livia Rhea Alvita ⁽⁴⁾, Yeni Ria Wulandari ⁽⁵⁾, Shintawati Shintawati ⁽⁶⁾, Mawar Siti Purnani ⁽⁷⁾, Dimas Amirul Mukminin Nur Efendi ⁽⁸⁾

  (1) Politeknik Negeri Lampung, Indonesia ,

  (2) Yuan Ze University, Taiwan, Province of China ,

  (3) Politeknik Negeri Lampung, Indonesia ,

  (4) Politeknik Negeri Lampung, Indonesia ,

  (5) Politeknik Negeri Lampung, Indonesia ,

  (6) Politeknik Negeri Lampung, Indonesia ,

  (7) Politeknik Negeri Lampung, Indonesia ,

  (8) Politeknik Negeri Lampung

  118-125

  Abstract : 55

  DOWNLOAD PDF : 29

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  DOI : 10.25273/cheesa.v6i2.15906.118-125