Organic chloride removal process

Abstract

Methods for a pre-treating process that removes organic chlorides from pyrolysis oils, vegetable oils, fats, or combinations thereof before they are sent to a processing unit are described, as well as an apparatus for the pre-treatment process. The pre-treatment process involves the catalytic hydrodechlorination of the pyrolysis oils, vegetable oils, fats, or combinations thereof. The pre-treatment process may include saturating dienes.

1 . A pre-treatment process for removing an organic chloride from an oil feed stream comprising pyrolysis oil, or vegetable oil, or fat, or combinations thereof and the organic chloride comprising:
 combining the oil feed stream with a first hydrogen stream to form a combined feed stream;   passing the combined feed stream through a catalytic hydrodechlorination reaction zone comprising a catalytic hydrodechlorination reactor containing a catalytic hydrodechlorination catalyst forming an effluent comprising dechlorinated pyrolysis oil, or vegetable oil, or fat, or combinations thereof and a gas phase comprising HCl;   introducing a caustic solution to the effluent to form a mixture comprising the dechlorinated pyrolysis oil, or vegetable oil, or fat, or combinations thereof and a solution comprising a chloride salt;   separating the mixture in a cold separator into a spent caustic stream comprising the chloride salt solution, a gas stream comprising hydrogen and HCl, and a dechlorinated oil stream comprising the pyrolysis oil, or vegetable oil, or fat, or combinations thereof having less than 10 ppmw organic chloride;   passing the dechlorinated oil stream to a processing unit.   
     
     
         2 . The process of  claim 1  further comprising:
 heating the combined feed stream to a temperature in a range of 285° C. to 375° C. before passing the combined feed stream to the catalytic hydrodechlorination reaction zone. 
 
     
     
         3 . The process of  claim 1  further comprising:
 saturating dienes in the combined feed stream before passing the combined feed stream through the catalytic hydrodechlorination reaction zone. 
 
     
     
         4 . The process of  claim 1  further comprising:
 cooling the mixture before separating the mixture. 
 
     
     
         5 . The process of  claim 1  further comprising:
 compressing a hydrogen feed stream to form a compressed hydrogen stream; and 
 dividing the compressed hydrogen stream into the first hydrogen stream and a second hydrogen stream. 
 
     
     
         6 . The process of  claim 5  further comprising:
 compressing the second hydrogen stream; and 
 introducing the compressed second hydrogen stream into the processing unit. 
 
     
     
         7 . The process of  claim 5  further comprising:
 introducing the second hydrogen stream into the processing unit. 
 
     
     
         8 . The process of  claim 5  further comprising:
 passing the gas stream from the cold separator through a bed comprising an HCl adsorbent to form a dechlorinated hydrogen stream. 
 
     
     
         9 . The process of  claim 8  further comprising:
 combining the dechlorinated hydrogen stream with the second hydrogen stream; or 
 combining the dechlorinated hydrogen stream with the hydrogen feed stream; or 
 both. 
 
     
     
         10 . The process of  claim 1  further comprising:
 filtering the oil feed stream to remove particulate matter before combining the feed stream with the first hydrogen stream. 
 
     
     
         11 . The process of  claim 1  further comprising:
 combining a portion of the dechlorinated oil stream with the oil feed stream. 
 
     
     
         12 . The process of  claim 1  further comprising:
 passing a mineral oil stream to the processing unit. 
 
     
     
         13 . An apparatus for removing an organic chloride from an oil feed stream comprising pyrolysis oil, or vegetable oil, or fat, or combinations thereof and the organic chloride comprising:
 an oil feed tank comprising an inlet and an outlet;   a first hydrogen compressor comprising an inlet and an outlet, the first hydrogen compressor inlet in downstream fluid communication with a source of hydrogen;   a catalytic hydrodechlorination reaction zone comprising a catalytic hydrodechlorination reactor containing a catalytic hydrodechlorination catalyst, the catalytic hydrodechlorination reaction zone having an inlet and an outlet, the inlet of the catalytic hydrodechlorination reaction zone being in downstream fluid communication with the oil feed tank outlet and the first hydrogen compressor outlet;   a cold separator having an inlet, a gas stream outlet, an oil outlet, and a spent caustic outlet, the cold separator inlet being in downstream fluid communication with the catalytic hydrodechlorination reaction zone outlet;   a source of caustic in fluid communication with a line between the catalytic hydrodechlorination reaction zone outlet and the cold separator inlet;   a processing unit comprising an oil inlet, the processing unit oil inlet being in downstream fluid communication with the cold separator oil outlet.   
     
     
         14 . The apparatus of  claim 13  further comprising:
 a heat source in thermal communication with a line between the oil feed tank outlet and the catalytic hydrodechlorination reaction zone inlet. 
 
     
     
         15 . The apparatus of  claim 13  further comprising:
 a diene saturation reactor positioned between the oil feed tank outlet and the catalytic hydrodechlorination reaction zone inlet. 
 
     
     
         16 . The apparatus of  claim 13  further comprising:
 a cooler positioned between the catalytic hydrodechlorination reaction zone outlet and the cold separator inlet. 
 
     
     
         17 . The apparatus of  claim 13  further comprising:
 a bed comprising an HCl adsorbent having an inlet and an outlet, the inlet in downstream fluid communication with the cold separator gas stream outlet. 
 
     
     
         18 . The apparatus of  claim 17  wherein:
 the first hydrogen compressor inlet is in downstream fluid communication with the HCl adsorbent bed outlet; or 
 the processing unit further comprises a hydrogen inlet and wherein the processing unit hydrogen inlet is in downstream fluid communication with the HCl adsorbent bed outlet; or 
 both. 
 
     
     
         19 . The apparatus of  claim 13  further comprising:
 a filter comprising an inlet and an outlet, the oil feed tank inlet being in downstream fluid communication with the filter outlet. 
 
     
     
         20 . The apparatus of  claim 13  further comprising:
 a mineral oil supply, the processing unit being in downstream fluid communication with the mineral oil supply.