Water-Washed Recycle Pyrolysis Oil for Cracker Feed

Abstract

A variety of methods and systems that include water washing of a recycle pyrolysis oil for feed to a cracker are disclosed, including, in one embodiment, a method including: contacting a recycle pyrolysis oil with water to produce a purified pyrolysis oil; and cracking the purified pyrolysis oil to produce a product.

What is claimed is: 
     
         1 . A method comprising:
 contacting a recycle pyrolysis oil with water to produce a purified pyrolysis oil; and   cracking the purified pyrolysis oil to produce a product.   
     
     
         2 . A method comprising:
 reducing the total acid number of a recycle pyrolysis oil to yield a purified pyrolysis oil comprising a TAN, as determined by ASTM D664, of about 1.5 mg KOH/g or less; and   cracking the purified pyrolysis oil to produce a product.   
     
     
         3 . A method comprising:
 removing nitrogen from a recycle pyrolysis oil to yield a purified pyrolysis oil comprising a total nitrogen content of about 850 wppm or less; and   cracking the purified pyrolysis oil to produce a product.   
     
     
         4 . A method comprising:
 removing chlorides from a recycle pyrolysis oil to yield a purified pyrolysis oil comprising a total chloride content of about 150 wppm or less; and   cracking the purified pyrolysis oil to produce a product.   
     
     
         5 . The method of  claim 2 , comprising contacting the recycle pyrolysis oil with water to yield the purified pyrolysis oil. 
     
     
         6 . The method of  claim 2 , wherein cracking the purified pyrolysis oil to produce a product comprises steam cracking the purified pyrolysis oil in the presence of steam. 
     
     
         7 . The method of  claim 2 , wherein cracking the purified pyrolysis oil is performed in the presence of a hydrocarbon co-feed. 
     
     
         8 . The method of  claim 7 , further comprising:
 admixing the purified pyrolysis oil with the co-feed to yield a mixed feed; and   cracking the mixed feed.   
     
     
         9 . The method of  claim 8 , wherein the cracking the mixed fixed is performed in a steam cracking furnace, and wherein the method comprises cracking a second hydrocarbon feed in the steam cracking furnace, wherein the second hydrocarbon feed is segregated from the purified pyrolysis oil in the steam cracking furnace. 
     
     
         10 . The method of  claim 9 , wherein the hydrocarbon co-feed is heavier than the second hydrocarbon feed that is segregated. 
     
     
         11 . The method of  claim 7 , wherein the cracking the purified pyrolysis oil is performed in a steam cracking furnace, wherein the purified pyrolysis oil and the hydrocarbon co-feed are separately fed to the steam cracking furnace. 
     
     
         12 . The method of  claim 11 , wherein the purified pyrolysis oil is fed to the steam cracking furnace downstream of the hydrocarbon co-feed. 
     
     
         13 . The method of  claim 11 , wherein the purified pyrolysis oil is fed to the steam cracking furnace downstream of the steam. 
     
     
         14 . The method of  claim 7 , wherein the hydrocarbon co-feed and the purified pyrolysis oil are present in a purified pyrolysis oil to hydrocarbon co-feed weight ratio of about 1:100 to about 1:2. 
     
     
         15 . The method of  claim 7 , further comprising:
 admixing the purified pyrolysis oil with the hydrocarbon co-feed to yield a mixed feed;   cracking the mixed feed in at least first and second steam cracker furnaces to yield a first product; and   cracking a separate hydrocarbon feed stream to yield a second product.   
     
     
         16 . The method of  claim 7 , wherein the hydrocarbon co-feed comprises at least one hydrocarbon selected from the group consisting of ethane, propane, butane, asphaltenes, resid, pitch, crude oil, naphtha, gas oil, liquefied petroleum gas, condensate, and combinations thereof. 
     
     
         17 . The method of  claim 7 , further comprising removing oxygen-containing compounds from the recycle pyrolysis oil. 
     
     
         18 . The method of  claim 1 , wherein the recycle pyrolysis oil further comprises methanol and the method further comprising removing at least a portion of the methanol from the recycle pyrolysis oil. 
     
     
         19 . The method of  claim 1 , wherein the recycle pyrolysis oil further comprises at least one additional contaminant selected from the group consisting of fluorine, a fluorine containing compound, bromine, a bromine containing compound, phosphorous, a phosphorous containing compound, and combinations thereof, and wherein the method further comprises removing at least a portion of the at least one additional contaminant from the pyrolysis oil. 
     
     
         20 . The method of  claim 2 , wherein the product comprises at least one hydrocarbon selected from the group consisting of an olefin, an aromatic, and combinations thereof. 
     
     
         21 . The method of  claim 2 , wherein the recycle pyrolysis oil comprises about 95% by weight or greater of hydrocarbons having at least carbon atoms, wherein the recycle pyrolysis oil comprises olefins in an amount of about 50% by weight or less, wherein the recycle pyrolysis oil comprises aromatic in an amount of about 20% by weight or less, and wherein the recycle pyrolysis oil has a final boiling point of about 400° C. to about 600° C. 
     
     
         22 . The method of  claim 2 , wherein the water has a pH of about 7 to about 10. 
     
     
         23 . The method of  claim 2 , wherein the TAN of the purified pyrolysis oil is about 0.5 to about 1.5 mg KOG/g, as determined by ASTM D664, wherein the total nitrogen content of the purified pyrolysis oil is about 400 wppm to about 850 wppm, and wherein the total chloride content of the purified pyrolysis oil is about 75 wppm to about 150 wppm. 
     
     
         24 . The method of  claim 2 , wherein the recycle pyrolysis oil is at least partially derived from plastic waste. 
     
     
         25 . The method of  claim 2 , wherein the recycle pyrolysis oil is at least partially derived from post-consumer use plastics.