A reaction unit for catalytic conversion of a hydrocarbon or hydrocarbon containing feedstock to a petrochemical mixture, the reaction unit comprising: a housing comprising a bottom port arranged on a bottom of the housing and configured to provide fluidization gas into the housing, a feeding pipe passing through a top of the housing, and a top port arranged on a side of the housing near the top of the housing and configured to allow a product within the housing to be removed from the reaction unit; a fluid bed distributor plate located at a bottom of the housing; an emulsifying device coupled to a first end of the feeding pipe and configured to provide dispersed oil droplets inside a continuous water phase to the feeding pipe; a fluidization valve arranged in the bottom port and configured to control an amount of fluidization gas entering the housing; a feedstock valve arranged in the feeding pipe and configured to control an amount of feedstock emulsion from the emulsifying device into the feeding pipe; a effluent gas valve arranged in the top port and configured to control an amount of effluent gas exiting the housing; a controller, which is coupled to the fluidization valve, the feedstock valve, and the effluent gas valve and which is configured to control heat generated from burning coke in the housing by independently controlling the fluidization valve, the feedstock valve, and the effluent gas valve; a regeneration zone and a stripping zone located above the fluid bed distributor plate, in which catalytic particles are housed; a reaction zone located above the stripping zone; and a condensation zone located above the reaction zone, in which a petrochemical product fluid is condensed. a housing comprising a bottom port arranged on a bottom of the housing and configured to provide fluidization gas into the housing, a feeding pipe passing through a top of the housing, and a top port arranged on a side of the housing near the top of the housing and configured to allow a product within the housing to be removed from the reaction unit; a fluid bed distributor plate located at a bottom of the housing; an emulsifying device coupled to a first end of the feeding pipe and configured to provide dispersed oil droplets inside a continuous water phase to the feeding pipe; a fluidization valve arranged in the bottom port and configured to control an amount of fluidization gas entering the housing; a feedstock valve arranged in the feeding pipe and configured to control an amount of feedstock emulsion from the emulsifying device into the feeding pipe; a effluent gas valve arranged in the top port and configured to control an amount of effluent gas exiting the housing; a controller, which is coupled to the fluidization valve, the feedstock valve, and the effluent gas valve and which is configured to control heat generated from burning coke in the housing by independently controlling the fluidization valve, the feedstock valve, and the effluent gas valve; a regeneration zone and a stripping zone located above the fluid bed distributor plate, in which catalytic particles are housed; a reaction zone located above the stripping zone; and a condensation zone located above the reaction zone, in which a petrochemical product fluid is condensed.