Production of hydrocarbons by pyrolysis of methyl esters from rapeseed oil

Abstract

The pyrolysis of a mixture of methyl esters from rapeseed oil has been studied in a tubular reactor between 550 and 850°C and in dilution with nitrogen. A specific device for the condensation of cracking effluents was used for the fractionated recovery of liquid and gaseous effluents, which were analyzed on-line by an infrared analyzer and by gas chromatography. The cracking products in the liquid effluent were identified by gas chromatography/mass spectrometry coupling. The effects of temperature on the cracking reaction were studied for a constant residence time of 320 ms and a constant dilution rate of 13 moles of nitrogen/mole of feedstock. The principal products observed were linear 1-olefins, n-paraffins, and unsaturated methyl esters. The gas fraction also contained CO, CO 2, and H 2. The middle-chain olefins (C10-C14 cut) and short-chain unsaturated esters, produced with a high added value, had an optimum yield at a cracking temperature of 700°C.

Synthesis of Transportation Fuels from Biomass: Chemistry, Catalysts, and Engineering

“…333,334 Table 29 shows the molar carbon selectivity for the pyrolysis reaction of rapeseed oil from 600 to 800°C. 335 As shown in Table 29, zeolite upgrading is a nonselective process making a range of compounds and undesired coke and lighter alkanes from vegetable oils. Zeolite catalysts also can produce aromatic compounds, and Twaiq et al observed that upgrading of palm oil with ZSM-5 produced a yield of 28, 9, and 5% gasoline, kerosene, and diesel fuel, respectively.…”

Biodiesel production from non-edible plant oils

“…To reduce of the high viscosity of vegetable oils, microemulsions with immiscible liquids such as methanol and ethanol and ionic or non-ionic amphiphiles have been studied (Billaud et al, 1995).…”

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“…Solantausta et al (1994) have tested the feasibility of using pyrolysis oil (from sawmill wastes) in a diesel engine with a pilot injection system, which proved to be successful for a short-term use. Other researchers (Billaud et al 1995;Jones et al 2009) have also reported the success of using pyrolysis oil blended with PD (whose characteristics were close to those of biodiesel) in diesel engines.…”