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All Journal Eksergi: Chemical Engineering Journal Techno LPPM
Gogot Haryono
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Steam Distillation of Essential Oil from Lemongrass (Cymbopogon citratus) using Microwave Pretreatment Sri Wahyu Murni, Ir., MT; Tutik Muji Setyoningrum; Gogot Haryono
Eksergi Vol 17, No 1 (2020)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v17i1.3300

Abstract

Essential oils from lemongrass (Cymbopogon citratus) containing citral are very potential to be used in food and pharmacy industries. The process of isolating essential oils is still constrained by its low yield. In order to increase yield, in this research, isolation of essential oil by steam distillation method was carried out using microwave pretreatment. The results showed that pretreatment using microwave for 2 minutes had the effect of increasing yield up to 1.4 times compared to without pretreatment. The essential oil produced using microwave pretreatment had physical properties (colour, odor, density, and refractive index) similar to those without pretreatment. Composition analysis by GC-MS showed that essential oils extracted using microwave pretreatment and without pretreatment contain geranial (Ecitral or citral-a), neral (Z-citral or citral-b) and mircena as the main components.
EKSTRAKSI FLAVONOID DARI TANAMAN OBAT SEBAGAI ANTI OKSIDAN Gogot Haryono
Techno LPPM Vol 1, No 1 (2015)
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

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Abstract

Flavonoids are phenolic compounds found in many plants and some species canact as antioxidants. Antioxidants are a substance very easily oxidized, so that when thereis an air / oxygen would oxidize antioxidants first before oxidize other substances.Penilitian result of various crops showed varying levels of antioxidants in each plant.This study aims to determine the levels of flavonoids in several medicinal plants arewidely consumed by humans is the parasite tea, red betel leaves, soursop leaves, fruit andleaves of gotu kola gods crown. From the research results for the five materials tested,mistletoe tea has the highest concentration of flavonoids. Research carried out by theextraction time of 120 minutes, the concentration of ethanol 96%, stirrer speed of 300rpm and a temperature of 70 ° C solution obtained parasite tea flavonoid concentrationof 0.575 g / L, the mass transfer coefficient (Kca) is calculated based on the results ofexperiments for the extraction of tea flavonoids parasite 0.00863382 min-1.Keywords: flavonoids, extraction, plant
Pengaruh Aktivasi Bentonit Wonosegoro terhadap Perbaikan Sifat Fisis Minyak Pelumas Bekas Industri Gogot Haryono
Eksergi Vol 9, No 1 (2008): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7548

Abstract

Bentonit is a kind of ore which has a high adsorption power due to its hígh content of montmorilonit. Its wìdely used in many applications as well as an activated carbon. In fact, activated bentonit can improve physical properties of used lubrícant oil partially its Rëdwood vìscocity, flash point and carbon residue. In this research, the activation procceses including heating, pressurizing and acíd methods. Such methods were conducted ìn a muffle burner (at temperature of 280, 300, 320, 340, 360 and 38 degree C, ín a pressure vessel (at pressures of 1.75; 2.23; 2.54; 2,66; and 3.02 atm), and three neck bottles (at acid concentrations of 0.1; 0.2; 0.3; 0.4 and 0.5 N), respectìvely. The activated bentonit was thereafter tested to absorp a quantity of sample used lubricant oil. From these experiments, it was concluded that activated bentonit can increase the Redwood viscocity and flash poínt of used lubrícant oil and also decrease its carbon residue. The optimum temperature, pressure and acidconcentratíon obtainedwere 36tC, 2.66 atm and 0.4 N, respectively. At this condition, the used lubricant oil had a Redwood víscocity 125.9 cP, flash point of 112 degree C and carbon residue of 22.05%.
Oksidasi Larutan Kalium Thiosulfat dalam Ekstrak Abu Tandan Sawit dengan Udara Gogot Haryono
Eksergi Vol 9, No 1 (2008): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7555

Abstract

Potossium sulphate is a kínd offertilizer whích nowadrys is still imported. The efortþr producing itfromdiferentfeedstockwås irwestigatedby many researchers. ThÍs researchwas an ahernativeway toproducepotassium sulphatefrom ash of empty palm-bunch. This objective ofthis researchwas particularly to studythe kinetic ofoxidationreaction ofpotassium sulphate productionfrom actract of ash ofempty palm-bunch,The æperíment was conducted by/ìlling the reactor with a potassium thiosulphate solution and thereþrebubbling air from bottom of the reactor with specitìed flow røe until steady condition was attained Theproductwas ønd analyzed at several certain time intervals. Iodometric methodwas appliedþr thiosulplwteanalysis and grartimetric method for sulphate analysis The øcperimental results showed that oxidationreaction rate of thiosulphate to sulphate was controlled by the reaction step, Temperature dependence ofthe rate constant consìdered by Arrhenius'
Koefisien Perpindahan Massa pada Ekstraksi Tanin dari Putrimalu (Mimosa Pudika) Tjukup Marnoto; Gogot Haryono
Eksergi Vol 9, No 1 (2009): Versi Cetak
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v9i1.7581

Abstract

Koefisien Perpindahan Massa pada Ekstraksi Tanin dari Putrimalu (Mimosa Pudika)
Co-Authors Sri Wahyu Murni, Ir., MT Tjukup Marnoto Tutik Muji Setyoningrum