Article

Hydrotreating of waste cooking oil for biodiesel production. Part I: Effect of temperature on product yields and heteroatom removal.

Chemical Process Engineering Research Institute - CPERI, Centre for Research and Technology Hellas - CERTH, Thermi-Thessaloniki, Greece.
Bioresource Technology (Impact Factor: 5.04). 09/2010; 101(17):6651-6. DOI: 10.1016/j.biortech.2010.03.081
Source: PubMed

ABSTRACT Hydrotreating of waste cooking oil (WCO) was studied as a process for biofuels production. The hydrotreatment temperature is the most dominant operating parameter which defines catalyst performance as well as catalyst life. In this analysis, a hydrotreating temperature range of 330-398 degrees C was explored via a series of five experiments (330, 350, 370, 385 and 398 degrees C). Several parameters were considered for evaluating the effect of temperature including product yields, conversion, selectivity (diesel and gasoline), heteroatom removal (sulfur, nitrogen and oxygen) and saturation of double bonds. For all experiments the same commercial hydrotreating catalyst was utilized, while the remaining operating parameters were constant (pressure=1200 psig, LHSV=1.0 h(-1), H(2)/oil ratio=4000 scfb, liquid feed=0.33 ml/min and gas feed=0.4 scfh). It was observed that higher reactor temperatures are more attractive when gasoline production is of interest, while lower reaction temperatures are more suitable when diesel production is more important.

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    ABSTRACT: It is well known that the used cooking oil (UCO) is responsible for the high pollution found in groundwater, fact that leads to increase treatment cost of wastewater, moreover, the environmental problems produced by the use of diesel fuel increase the need of seeking alternatives to decrease this problems by means of the reuse of UCO, finding a cleaner alternative fuel. Biofuel such as biodiesel is considered as one of this alternative having environmental advantage due to decrease of pollutant emissions in diesel engines. Biodiesel from UCO is produced throughout the transesterification reaction, using alcohol and a catalyst. This paper reports the effect of temperature, alcohol/oil molar ratio, and catalyst amount used over the yield of the transesterification reaction using oil from hotel industry. The homogeneous catalysts was based in NaOH from 0.5 and 0.7% by weight, the range operation temperatures were between 50 and 60 °C, with molar ratio alcohol / oil 6/1 and 9/1. Quite high yield values were shown, among 83 and 95%, with a statistical error of less than 0.5.
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  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: It is well known that the used cooking oil (UCO) is responsible for the high pollution found in groundwater, fact that leads to increase treatment cost of wastewater, moreover, the environmental problems produced by the use of diesel fuel increase the need of seeking alternatives to decrease this problems by means of the reuse of UCO, finding a cleaner alternative fuel. Biofuel such as biodiesel is considered as one of this alternative having environmental advantage due to decrease of pollutant emissions in diesel engines. Biodiesel from UCO is produced throughout the transesterification reaction, using alcohol and a catalyst. This paper reports the effect of temperature, alcohol/oil molar ratio, and catalyst amount used over the yield of the transesterification reaction using oil from hotel industry. The homogeneous catalysts was based in NaOH from 0.5 and 0.7% by weight, the range operation temperatures were between 50 and 60 °C, with molar ratio alcohol / oil 6/1 and 9/1. Quite high yield values were shown, among 83 and 95%, with a statistical error of less than 0.5.
    International Conference on Renewable Energies and Power Quality (ICREPQ’13), Bilbao (Spain); 03/2013

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