Dichlorotoluene isomeride rectification separation method based on light component solvent

The invention relates to the technical field of toluene chloride isomeride separation, in particular to a dichlorotoluene isomeride rectification separation method based on a light component solvent. The invention relates to a dichlorotoluene isomeride rectification separation method based on a light component solvent. The method comprises the following steps: carrying out rectification treatment on a dichlorotoluene isomeride mixture and an entrainer in a rectification tower B1; the mixture of the 2, 6-dichlorotoluene and the entrainer collected at the top of the rectifying tower B1 is fed into a rectifying tower B3 to be rectified, a 2, 6-dichlorotoluene product is collected in a tower kettle of the rectifying tower B3, the rectifying tower B3 is used for separating the mixture of the 2, 4-dichlorotoluene and the 2, 5-dichlorotoluene from the tower kettle of the rectifying tower B1, and the rectifying tower B4 is used for obtaining the 2, 4-dichlorotoluene product. According to the technical scheme, the sep