intheHydrogenationUnit1.Theopencarbonbondsaresaturatedbyhydrogenbecauseof
highhydrogenpressure,morethan10millionN/m2.Theliquidproductgoesthroughthe
distillationprocess.Anyleft-overinertmaterial,whichisnotseparatedandremovedinthe
depolymerizationstep,andtheunconvertedplasticportionarecollectedinthebottomof
thedistillationcolumnandremovedasaresidue,hydrogenationbitumen.Thefinalhigh-
qualityproducts,off-gasandsyncrude,areobtainedbyhydrotreatment(Hydrogenation
Unit2).Thesefinalproductsaresenttoconventionalpetrochemicalprocesses.
Themixedplasticwasteisconvertedintothefollowingproducts:80wt.%intoliquid
product,10wt.%intooff-gas(methano-butane),and10wt.%residue.Theliquidproductis
freeofchlorineandextremelylowinoxygenandnitrogen;85wt.%canbeusedascracker
feed(AssociationofPlasticsManufacturersinEurope,1997).Therest,dependingonthe
propertiesoftheplasticwaste,isethylbenzene,whichisanexcellentgasolinecomponent.
Thesolidresidue,whichcouldalsobeblendedwiththecoalforapowerplant,canbeused
toimprovethepropertiesofcoalforcokeproduction.
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