How to remove excess benzaldehyde in the picture?

The gap can be, the product should be solid

Cross

What is water soluble after the product is salt, and the good words can be purified by regulating acid alkali

Try the sodium hydrogen sulfite solution, it should be washed away benzaldehyde, and the product should be ketone should not be so easy to add salt.

Compared to product, benzaldehyde polarity is very small, and the column is worry-free, and fast.