以下为句子列表：
英文: A process approaching 3-and 4-chlorophthalic anhydride in high purity via chloriation of o-xylene, oxidation of monochloro-o-xylene by air in gas phase, and separation of 3-and 4-chlorophthalic anhydride afterwards by distillation is described.
中文: 摘要介绍由邻二甲苯氯代，再经空气氧化及异构体分离合成氯代苯酐中试规模的合成路线。
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