| 摘要 |
<p><PICT:0897586/III/1> In the process of the parent Specification, wherein hydrocarbons such as petrol, benzene, gas oil, and the like are catalytically hydrogenatively refined in the presence of hydrogen or a hydrogencontaining gas by vaporizing the hydrocarbon in a double or more effect vaporizer through which effects they pass in succession in admixture with the hydrogen before being refined, and which in the course of their vaporization are maintained in circulation through each vaporizer offset by the action of the hydrogen as in an air-lift pump in such manner that only the liquid phase flows through the heating system of the vaporizer, characterized in that the vaporizers are heated by the gas-vapour mixture emerging from the hydrogenating refining after the said mixture has transferred some heat preferably to the gas-vapour which is about to be refined, in such manner that the gas vapour mixture which serves as the heating medium flows in succession through the heating systems of the several vaporizers in countercurrent to the hydrocarbon to be vaporized and hydrogen, the present invention introduces the additional step of treating the residue which is withdrawn from the final vaporizer with fresh circulation gas, which gas is then passed to the first vaporizer, thereby recovering hydrocarbons and heat from the residue. The Figure illustrates a suitable plant for carrying out the process of the invention, wherein the residues are located in column 69, 70, 71 with fresh circulating gas via line 68, which gas leaves via line 60 and enters the first vaporizer 7.</p> |
