Abstract: An apparatus for pyrolysis of hydrocarbon starting products comprises a horizontally split casing for molten heat carrier. At least one injector having a nozzle for feeding hydrocarbon starting products to the casing and at least one pipe for removal of pyrolysis products are mounted in the upper part of the casing. The apparatus also has means for supplying heat to the heat carrier. According to the invention, the injector is mounted in such a manner that the outlet section of its nozzle is spaced apart from the surface of the heat carrier at a distance which is sufficient for the formation of a hydrodynamic crater in this surface under the action of a jet of hydrocarbon starting products flowing from the nozzle. Means for supplying heat to the heat carrier is arranged within the casing in such a manner that heat is supplied directly within the heat carrier.

Abstract: Pyrolysis of hydrocarbon starting products is carried out in a cylindrical casing containing a liquid heat carrier at a predetermined level in the casing. The casing is split into a heating zone and a pyrolysis zone by a cylindrical baffle which extends a small distance below the surface of the heat carrier. A jet directs a gaseous heating agent onto the surface of the heat carrier in the heating zone. Another jet directs hydrocarbon starting products onto the surface of the heat carrier in the pyrolysis zone where pyrolysis products are formed.