The high recovery rate at the top of sieve plate distillation operation leads to unqualified products. What is the fastest and most effective way to return to normal?

For this kind of D/F is too large, the heat load at the bottom of the tower can be kept constant, the feed and discharge at the bottom of the tower can be increased, and the extraction rate at the top of the tower can be reduced, so that the extraction rate at the top of the distillation column is