초록 ▼

Coal, petroleum residuum and similar carbonaceous feed materials are subjected to hydroconversion in the presence of molecular hydrogen to produce a hydroconversion effluent which is then subjected to one or more separation steps to remove lower molecular weight liquids and produce a heavy bottoms s

Coal, petroleum residuum and similar carbonaceous feed materials are subjected to hydroconversion in the presence of molecular hydrogen to produce a hydroconversion effluent which is then subjected to one or more separation steps to remove lower molecular weight liquids and produce a heavy bottoms stream containing high molecular weight liquids and unconverted carbonaceous material. The viscosity of the bottoms streams produced in the separation step or steps is prevented from increasing by treating the feed to the separation step or steps with hydrogen sulfide gas prior to or during the separation step or steps. The viscosity of the heavy bottoms stream produced in the final separation step is also controlled by treating these bottoms with hydrogen sulfide gas. In a preferred embodiment of the invention, the effluent from the hydroconversion reactor is subjected to an atmospheric distillation followed by a vacuum distillation and the feeds to these distillations are contacted with hydrogen sulfide during the distillations.

대표청구항 ▼

In a process for the hydroconversion of a carbonaceous feed in the presence of molecular hydrogen in a hydroconversion zone wherein a hydroconversion effluent containing liquids and unconverted carbonaceous material is produced, and said effluent is subjected to one or more separation steps downstre

In a process for the hydroconversion of a carbonaceous feed in the presence of molecular hydrogen in a hydroconversion zone wherein a hydroconversion effluent containing liquids and unconverted carbonaceous material is produced, and said effluent is subjected to one or more separation steps downstream of said hydroconversion zone to remove lower molecular weight liquids from said effluent and thereby produce a heavy bottoms stream containing high molecular weight liquids and unconverted carbonaceous material, the improvement which comprises contacting the feed stream to said separation step or steps at a temperature between about 300°F. and about 700°F. with added hydrogen sulfide gas prior to or during said separation step or said separation steps, thereby reducing and controlling the viscosity of said heavy bottoms stream.