The invention provides a powder-gas heat exchanger for exchanging heat between a powder stream and a gas stream in counter-current flow comprising a powder stream mass flow rate substantially equal to a gas stream mass flow rate in a vertical shaft heat exchanger. A hot gas stream may be adapted for use in heating a cool solids stream, or a cool gas stream may be adapted for use in cooling a hot solids stream.

The present disclosure relates to a catalytic reactor for cracking wax of pyrolysis oil generated from waste plastic pyrolysis emulsification process, a catalytic composition and a production method thereof. Particularly, the present disclosure relates to a catalytic composition for cracking wax, including: a support that includes zeolite containing silicon oxide and aluminum oxide, and silica; and an active metal that includes iron and zinc, and is immersed in the support, thereby cracking carbides with C14 or more included in wax of pyrolysis oil generated during waste plastic emulsification process.