Utilization of Petroleum Waste in Coal Liquefaction

Ramdoss, Prakash K.; Kuo, C.H.; Tarrer, A.R.

doi:10.1021/ef9600117

Cited by 6 publications

(1 citation statement)

References 12 publications

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“…Comparing the references above, one can roughly note the different temperature ranges between the pyrolysis and incineration processes. Other studies included the utilizations of petroleum waste, waste oil, and petroleum vacuum resid in coal liquefaction. − Coprocessing of coal with petroleum wastes that contained dispersant additives could improve the dispersion of the coal particles and the catalysts during liquefaction. Coal conversions in excess of 90% were obtained, with conversion to oil of 50%.…”

Section: Introductionmentioning

confidence: 99%

Major Products Obtained from the Pyrolysis of Oil Sludge

et al. 2000

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Oil sludge, if unused, is one of the major industrial wastes that needs to be treated for the refinery or petrochemical industry. It contains a large portion of combustible components with high heating values. Obviously, the conversion of oil sludge to various useful materials such as lower molecular weight organic compounds and carbonaceous residue via pyrolysis not only solves the disposal problem but also matches the appeal of resource utilization. In this study, the oil sludge from the oil storage tank of a typical petroleum refinery plant located in northern Taiwan is used as the raw material of pyrolysis. Its heating value of dry basis and low heating value of wet basis are about 10681 and 5870 kcal/kg, respectively. The pyrolysis of oil sludge is conducted by using nitrogen as carrier gas in the temperature range 378-873 K. The pyrolytic reaction is complex and significant in the range 450-800 K. The residues of pyrolysis of oil sludge exhibit very high viscous form below 623 K (pyrolysis temperature), while low viscous or solid form above 713 K. The major gaseous products (noncondensable gases at 298 K) excluding N 2 are CO 2 (50.88 wt %), HCs (hydrocarbons, 25.23 wt %), H 2 O (17.78 wt %), and CO (6.11 wt %). The HCs mainly consist of low molecular weight paraffins and olefins (C 1 -C 2 , 51.61 wt % of HCs). The temperature corresponding to the maximum production rate of HCs is 713 K. The distillation characteristics of liquid product (condensate of gas at 298 K) from the pyrolysis of oil sludge is close to diesel oil. However, it contains a significant amount of vacuum residue of about 9.57 wt %. The heating value of liquid product is about 10840 kcal/kg. All this information is useful not only to the proper design of a pyrolysis system but also to the better utilization of liquid oil product and understanding of gaseous emission.

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Section: Introductionmentioning

confidence: 99%

Major Products Obtained from the Pyrolysis of Oil Sludge

et al. 2000

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Resources recovery of oil sludge by pyrolysis: kinetics study

Shie

Chang

Lin

et al. 2000

J. Chem. Technol. Biotechnol.

104

103

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Oil sludge, if unused, is one of the major industrial wastes requiring treatment from petroleum re®nery plants or the petrochemical industry. It contains a large amount of combustibles with high heating values. The treatment of waste oil sludge by burning has certain bene®ts; however, it cannot provide the useful resource ef®ciently. On the other hand, the conversion of oil sludge to lower molecular weight organic compounds by pyrolysis not only solves the disposal problem but also has the appeal of resource utilization. The major sources of oil sludge include the oil storage tank sludge, the biological sludge, the dissolve air¯otation (DAF) scum, the American Petroleum Institute (API) separator sludge and the chemical sludge. In this study, the oil sludge from the oil storage tank of a typical petroleum re®nery plant located in northern Taiwan is used as the raw material of pyrolysis. Its heating value of dry basis and low heating value of wet basis are about 10681 kcal kg À1 and 5870 kcal kg À1 , respectively. The removal of the moisture from oil sludge signi®cantly increases its heating value. The pyrolysis of oil sludge is conducted by the use of nitrogen as the carrier gas in the temperature range of 380±1073 K and at various constant heating rates of 5.2, 12.8 and 21.8 K min À1 . The pyrolytic reaction is signi®cant at 450±800 K and complex. For the sake of simplicity and engineering use, a onereaction kinetic model is proposed for the pyrolysis of oil sludge, and is found to satisfactorily ®t the experimental data. The activation energy, reaction order and frequency factor of the corresponding pyrolysis reaction in nitrogen for oil sludge are 78.22 kJ mol À1 , 2.92 and 9.48 Â 10 5 min À1 , respectively. For precise use, the two-and three-reaction models are proposed to describe the pyrolysis results. Among the three models proposed, the three-reaction model gives the best ®t. These results are very useful for the proper design of the pyrolysis system of the oil sludge under investigation.

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High-temperature liquefaction of waste plastics

Ramdoss

Tarrer

1998

Fuel

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Utilization of Petroleum Waste in Coal Liquefaction

Cited by 6 publications

References 12 publications

Major Products Obtained from the Pyrolysis of Oil Sludge

Major Products Obtained from the Pyrolysis of Oil Sludge

Resources recovery of oil sludge by pyrolysis: kinetics study

High-temperature liquefaction of waste plastics

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