Preparation method of 1-chloropropylene

https://patents.google.com/patent/CN105669359A/en (Embodiment 1)

I tried the above patent in reflux condenser. Not >95% converted. But there is conversion happens (exothermic condition) and obtained product. But if i delayed the addition of dichloropropane (time delay due to taking time for dissolving NaOH otherwise it will chock on reactor circulation), the reaction not proceeds, even if i give temperature - 80 degree (endothermic). I see salts formed but product not identified in GC.

My question is reaction proceeds in exothermic condition and not endothermic condition. Why?

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