摘要 : Growing demand for high-value aromatic products means that many refiners and petrochemical companies are keen to maximise paraxylene(PX)and orthoxylene(OX)yields.Doing so cost effectively,however,is not straightforward.This is bec... 展开 Growing demand for high-value aromatic products means that many refiners and petrochemical companies are keen to maximise paraxylene(PX)and orthoxylene(OX)yields.Doing so cost effectively,however,is not straightforward.This is because more than 75% of PX and OX production costs originate from an increasingly expensive feed.An innovatively-engineered,new zeolite catalyst system could significantly improve the economics of aromatics conversion.This article will reveal how Shell Catalysts & Technologies'researchers unlocked significant activity and selectivity gains by deploying a dual-bed catalyst configuration,ground-breaking passivation technology,and a highly-selective novel metal function.Owing to the evolution of the chemical industry,PX demand has risen steadily at 6%/yr since 2009.A key driver is its'use in polyester plastics such as polyethylene terephthalate,or PET,which is widely us'ed for food and beverage packaging.Sustained demand is forecast for the next five years,with a 3% compound annual growth rate for xylene isomerisation predicted.1 Consequently,the ability to leverage oil to chemicals will be on the radar for many refiners.The challenge that emerges is to maximise PX and OX yields,per unit of refinery feed.while;using the lowest amount of energy. 收起