Method for making a heavy wax composition
AssigneesChevron U.S.A. Inc., University of Kentucky Research Foundation
InventorsStephen J. Miller, Gerald P. Huffman, Naresh Shah
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Abstract
The invention includes a process of making a wax composition including: a process for making a heavy wax composition including the steps of (1) contacting a waste plastics feed containing primarily polyethylene in a pyrolysis zone at sub-atmospheric pressure, whereby at least a portion of the waste plastics feed is cracked, thereby forming a pyrolysis zone effluent including 1-olefins and n-paraffins; and (2) passing the pyrolysis zone effluent to a hydrotreating zone, for contacting with a hydrotreating catalyst at catalytic conditions.
Claims19
A process for making a heavy wax composition comprising the steps of:
- (a) passing a waste plastics feed comprising polyethylene to a pyrolysis zone, having a sub-atmospheric pressure, whereby at least a portion of said waste plastics feed is cracked, thereby forming a pyrolysis zone effluent comprising 1-olefins and n-paraffins;
- (b) passing at least a portion of said pyrolysis zone effluent to a catalytic hydrotreating zone wherein at least a portion of said pyrolysis zone effluent is contacted with a hydrotreating catalyst at hydrotreating conditions, thereby producing a hydrotreated pyrolysis zone effluent;
- and
- (c) wherein said hydrotreated pyrolysis zone effluent comprises a wax having a melting point of at least about 100.degree. C.
A process for making a heavy wax composition comprising the steps of:
- (a) passing a waste plastics feed comprising polyethylene to a pyrolysis zone having a temperature of from about 600.degree. C. to about 700.degree. C. and pressure not greater than about 0.75 atm., whereby at least a portion of said waste plastics feed is cracked, thereby forming a pyrolysis zone effluent comprising 1-olefins and n-paraffins;
- (b) passing said pyrolysis zone effluent, to a separation zone, thereby separating said pyrolysis zone effluent into at least a one heavy fraction and one middle fraction, said middle fraction comprising normal alpha olefins, to a separation zone;
- wherein said pyrolysis effluent heavy fraction portion is separated from said pyrolysis effluent middle fraction;
- (c) passing pt least a portion of said pyrolysis effluent heavy fraction to a catalytic hydrotreating zone wherein at least a portion of said pyrolysis effluent heavy fraction is contacted with a hydrotreating catalyst at hydrotreating conditions, thereby producing a hydrotreated pyrolysis effluent heavy fraction;
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- (d) wherein said hydrotreated pyrolysis effluent heavy fraction comprises a wax having a melting point of at least about 100.degree. C.
Dependencies are inferred from the claim text.