Heat integration with aqueous heat transfer medium for chemical recycling facilities
AssigneeExxonMobil Product Solutions Company
InventorsMichael Gary Polasek, Daryl Bitting, Xianchun Wu, David Eugene Slivensky, Avery L. Anderson
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Abstract
A heat integration process and system for a chemical recycling facility is provided that can lower the carbon footprint and global warming potential of the facility. More particularly, one or more heat transfer media may be used to recover heat energy from a waste plastic pyrolysis effluent and redistribute the recovered heat energy throughout the chemical recycling facility. Thus, the global warming potential of the chemical recycling facility may be optimized and lowered due to the heat integration process and system herein.
Claims20
A pyrolysis process comprising:
- (a) pyrolyzing waste plastic at a temperature of 650° C. to 1,100° C. in a pyrolysis reactor to thereby provide a pyrolysis effluent;
- (b) heating an aqueous heat transfer medium (HTM) in a heat transfer medium loop via indirect heat exchange with at least a portion of the pyrolysis effluent to thereby provide a heated aqueous HTM exhibiting a pressure of at least 700 psi;
- and
- (c) heating at least a portion of the waste plastic upstream of the pyrolysis reactor with at least a portion of the heated aqueous HTM via indirect heat exchange, wherein the aqueous heat transfer medium (HTM) is not mixed with the pyrolysis effluent or the waste plastic.
A pyrolysis process comprising:
- (a) providing a first aqueous heat transfer medium (HTM) in a first heat transfer medium (HTM) loop and a second aqueous HTM in a second heat transfer medium (HTM) loop;
- (b) liquifying waste plastic in a liquification vessel to thereby form a liquefied waste plastic, wherein the liquifying includes heating at least a portion of the waste plastic via indirect heat exchange with a heated second aqueous HTM in the liquification vessel and/or upstream of the liquification vessel, wherein the second aqueous heat transfer medium (HTM) is not mixed with the at least portion of the waste plastic;
- (c) heating at least a portion of the liquefied waste plastic downstream of the liquification vessel via indirect heat exchange with a heated first aqueous HTM to thereby provide a heated liquified waste plastic;
- (d) pyrolyzing at a temperature of 650° C. to 1,100° C. at least a portion of the heated liquefied waste plastic in a pyrolysis reactor to thereby form a pyrolysis effluent;
- (e) heating at least a portion of the first aqueous HTM with a higher temperature portion of the pyrolysis effluent to thereby form the heated first aqueous HTM, wherein the heated first aqueous HTM has a pressure of at least 700 psi;
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- (f) heating at least a portion of the second aqueous HTM with a lower temperature portion of the pyrolysis effluent to thereby form the heated second aqueous HTM, wherein the heated second aqueous HTM has a pressure of less than 700 psi.
A pyrolysis process comprising:
- (a) heating a waste plastic in a liquification vessel to thereby form a liquefied waste plastic;
- (b) pyrolyzing at a temperature of 650° C. to 1,100° C. the liquefied waste plastic in a pyrolysis reactor to form a pyrolysis effluent;
- and
- (c) supplying heat energy to the waste plastic and/or the liquefied waste plastic via indirect heat exchange with an aqueous heat transfer medium (HTM) in a heat transfer medium loop wherein the heat energy supplied by the aqueous HTM is obtained by heat recovery from the pyrolysis effluent.
Dependencies are inferred from the claim text.