Apparatus for thermal cracking of or heating of hydrocarbons
AssigneeShowa Denko K.K.
InventorsYoji Watanabe, Toshio Morimura, Yukio Toyoda
Life of this patent
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Abstract
In the thermal cracking of or heating of hydrocarbons, for example naphtha, a carbonization reaction incidentally takes place due to the fact that Ni, Fe and Co contained in, for example, the conduits of the thermal cracking apparatus have a catalytically carbonizing action. The aim of the present invention is to effectively suppress carbon deposition promoted by these elements, to provide for the incorporation of an inhibitor element, e.g. Li, Na, Ba, Be, Ca, Mg or their oxides, into the heat-resistant alloy, and to form on the surface of this alloy a carbon deposition suppressing layer which comprises an inhibitor element.
Claims6
An apparatus for heating of hydrocarbons, comprising a radiation chamber for thermal cracking of starting hydrocarbons, a convection chamber communicating with said radiation chamber, a preheating conduit for starting hydrocarbon extending from a source of starting hydrocarbons into said convection chamber, a steam conduit communicating with said preheating conduit, a thermal cracking reaction conduit having at least the inner surface thereof made of one of a heat resistant material selected from the group consisting of non-ferrous nickel-chrome alloys and nickel-chrome steels for preheated starting hydrocarbons located in said radiation chamber, and a heat recovery device made of one of a heat resistant material selected from the group consisting of non-ferrous nickel-chrome alloys and nickel-chrome steels communicating with said cracking reaction conduit via an intermediate conduit made of one of a heat resistant material selected from the group consisting of non-ferrous nickel-chrome alloys and nickel-chrome steels, wherein a carbon-deposition-suppressing amount of at least one member selected from the group consisting of an alkali metal, an alkaline earth metal, an alkali metal-oxide and an alkaline earth metal-oxide is incorporated, as one of a solid solution and dispersed phase into at least an inner surface portion of said one of a heat resistant material selected from the group consisting of non-ferrous nickel-chrome alloys and nickel-chrome steels of said thermal cracking reaction conduit, said heat recovery device and said intermediate conduit.
Dependencies are inferred from the claim text.