Sulfonated oil tail gas impurity removal system

The utility model discloses a sulfonated oil tail gas impurity removal system which comprises a feed preheater, the feed preheater conveys heated sulfonated oil to a rectifying tower, and a gas phase outlet in the top of the rectifying tower cools o-toluenesulfonyl chloride through a rectifying condenser and a rectifying cooler in sequence and conveys the o-toluenesulfonyl chloride to an o-chlorine receiving tank. The o-position chlorine receiving tank is used for conveying o-toluenesulfonyl chloride to an amination process; the acyl chloride tail gas is conveyed to the vacuum system by the top of the ortho-chlorine receiving tank through a pipeline; the vacuum system comprises a plurality of buffer filtering mechanisms, the buffer filtering mechanisms convey tail gas to a vacuum pump unit, and the vacuum pump unit conveys the tail gas to a waste gas incinerator through a fan to be incinerated. The buffer filtering mechanism is arranged in the vacuum system and adopts a plurality of cooling buffer filters, an