CHEMICA: Jurnal Teknik Kimia

The Effect of Coffee Dregs Addition on the Manufacture of Corn Cob Briquettes with Variation of Adhesive Type

Mochammad Agung Indra Iswara, Sigit Hadiantoro, Susanto Susanto — Tue, 03 Dec 2024 00:00:00 +0000

Energy demand is rising while the availability of fossil fuels is declining. In order to reduce the use of fossil fuels, it is necessary to utilize biomass energy as an alternative. Agricultural waste, such as corn cobs and husks, is used as raw materials for making briquettes. This study uses the carbonization method to convert raw materials into charcoal. Tapioca flour and sago flour are used as binders in the briquettes. Evaluation for calorific value, ash content, and moisture content are performed according to SNI 01-6235-2000. The research results show that briquettes made from a 50% ratio of corn cobs and coffee husks with sago flour as a binder have a moisture content of 4.93%, ash content of 2.22%, and calorific value of 5404.27 cal/gram.

Evaluation of Carica Papaya Seed Activated Carbon as Basic Catalyst Support: Extent and Base Concentration

Sat, 30 Nov 2024 00:00:00 +0000

Carica Papaya or Papaya seed is one of the abundant agricultural residues that contain carbon atoms. This study evaluated the role of activated carbon as essential catalyst support. Papaya seeds were dried, crushed, and activated using sulfuric acid. After being chemically activated, carbon was physically activated through heating. At 110 ºC. The synthesized activated carbon was then impregnated with NaOH for contact time variation (180, 240, 300, and 360 minutes) with varying alkaline concentrations (30, 40, 50, and 60%). The synthesized supported catalyst on activated carbon was morphologically characterized through SEM. Additionally, the structure and elemental composition of the supported catalyst were analyzed with EDX. It was found that morphologically, concentration enhanced NaOH dispersion onto activated carbon in positive means with a 20% NaOH concentration increase by 0.6%. On the other hand, impregnation time displayed a maximum point, after which the impregnation process did not proceed significantly from 240 to 360 minutes by 1.25%. Moreover, impregnated activated carbon also presented an identical trend, with Sodium and Oxygen substances being impregnated in the same manner for both impregnation parameter variations. On top of that, the structure analysis through XRD depicted the potential heterogeneous solid catalytic performance of NaOH supported with activated carbon from papaya seed. The findings showed that activated carbon from Papaya seed with NaOH impregnation has the potential for Biodiesel production as a heterogeneous catalyst.

Energy Management and Conservation Industrial and Building Sectors: A Review

Nurmustaqimah Nurmustaqimah, Erna Astuti, Siti Jamilatun — Sat, 30 Nov 2024 00:00:00 +0000

Energy conservation is essential in tackling the rising worldwide energy consumption, particularly in the industrial and construction sectors. This study examines critical ways to reduce energy usage by altering user behavior, eliminating energy waste, and implementing efficient technologies. The industrial sector, responsible for a substantial share of worldwide energy consumption, can realize cost savings and enhanced profitability by adopting Energy Management Systems (EMS) and efficiency initiatives. Innovations in the construction industry, including thermal insulation, LED lighting, and efficient HVAC systems, yield substantial energy savings, as seen by case studies of commercial buildings and hotels. Furthermore, successful programs like renewable energy integration and sophisticated energy management systems illustrate the economic and environmental advantages of energy saving.