预计到2004年,世界邻二甲苯需求的年增长率为4.2％,2004年将达到3 300 kt。2001年美国对邻二甲苯的需求达450.5 kt。邻二甲苯衍生物邻苯二甲醛(PA)可用于制备邻苯二甲酸酯增塑剂。邻二甲苯是从炼厂或烯烃装置生产芳烃中C_6～C_8物流转化生产的几种二甲苯异构体之一。混合二甲苯物流含邻、间和对二甲苯。这些组分可用抽提蒸馏分离或将它们异构化为对二甲苯。 2000年全球邻二甲苯总生产能力为2 800 kt。按地区分布,亚洲占49％,西欧占23％,北美占18％,南美占9％,其他地区占6％。在邻二甲苯的用途中,邻苯二甲酸 It is estimated that by 2004, the annual growth rate of the demand for ortho-xylene in the world will be 4.2%, and in 2004 it will reach 3,300 kt. In 2001, the demand for o-xylene in the United States reached 450.5 kt. O-xylene derivatives Phthalaldehyde (PA) can be used to prepare phthalate plasticizers. Ortho-xylene is one of several xylene isomers produced from the conversion of C_6 to C_8 streams from the production of aromatics in refineries or olefin plants. The mixed xylene stream contains o-, m-, and p-xylene. These components can be separated by extractive distillation or they can be isomerized to paraxylene. Global o-xylene production capacity in 2000 was 2 800 kt. In terms of geographical distribution, Asia accounts for 49%, Western Europe accounts for 23%, North America accounts for 18%, South America accounts for 9%, and other regions account for 6%. In the use of o-xylene, phthalic acid