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Submitted Chris Haslego, Nov 21 2011 11:21 AM | Last updated Nov 21 2011 01:29 PM




Category: Refining
Question: What is petroleum pitch?
Keywords: petroleum,pitch,definition,heavy,oil,residue,
Answer: Ind. Eng. Chem. Product Research and Development Vol. 2 No. 1 March 1963., p.p. 66-70 defined petroleum pitch as follows:Solid petroleum pitch is an asphalt concentrate from crude oil, where enough oil has been removed from the asphalt to produce a coal-like solid of high melting point?Ǫ Petroleum pitch differs from coal and petroleum coke in that it has a melting or softening point. This softening point is high enough, however (about 350 0F), to allow pitch to be stored in a 40 foot piles at 170 0F without the agglomeration of particles. Petroleum pitch is a concentrate of the asphaltic material in crude. By removing or eliminating oil which is included with normal vacuum ?Çô reduced crudes, a pitch can be produced whose asphaltene concentration is sufficiently high to impart hardness properties, which permit satisfactory handling, storing, grinding, and burning as a solid fuel. From certain crudes which have very hard asphalts, it possible to produce solid petroleum pitch by simply increasing the severity of normal refinery vacuum distillation by 50 to 100 0F (corrected to 760 mm of Hg). By varying the severity of distillation, pitches of varying softening point can be obtained; however, pitches of higher softening point are more difficult and costly to produce and the resulting gas oils have higher carbon residues and metals content. It is believed that pitches of 350 0F minimum softening point can be handled and burned in most burners designed for either coal or heavy fuel oil with but minor modifications, and it is possible that lower softening point (275 to 325 0F) pitches can be handled and burned in specially designed equipment.


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