Protection of Alcohol I carried out an experiment and it goes like this:

2-bromoethanol + dihydropyran (DHP) ---> 2-(2-bromoethoxy)oxane

Acidic ion exchange resin was added alongside as a source of H+ ions (catalyst).

If, instead of using acidic ion exchange resin, a conventional acid such as p-toluenesulfonic acid was used as a catalyst. How can it be removed from the product?

I thought of using a weak base, but would there be any side products formed?
I have run this exact reaction with pTSA in CH2Cl2 many times. As @NotEvans says above, wash with saturated  sodium hydrogen carbonate solution, dry over anhydrous sodium sulfate, filter and concentrate under reduced pressure