A column for consecutive extractive distillations, in particular of crude hydrocarbon mixes comprising aromatic, naphthene and paraffin hydrocarbons. The invention also relates to methods for separating and recovering the components of a crude hydrocarbon mix comprising aromatic, naphthene and paraffin hydrocarbons by consecutive extractive distillations provided by means of the column for consecutive extractive distillations, to which the invention also relates.

A column for consecutive extractive distillations, in particular of crude hydrocarbon mixes comprising aromatic, naphthene and paraffin hydrocarbons. The invention also relates to methods for separating and recovering the components of a crude hydrocarbon mix comprising aromatic, naphthene and paraffin hydrocarbons by consecutive extractive distillations provided by means of the column for consecutive extractive distillations, to which the invention also relates.

Nanocatalysts and methods of using the same to obtain aromatic hydrocarbon compounds from a source of carbon atoms and a source of hydrogen atoms in a single reaction step is provided. The catalyst comprises an Fe/Fe.sub.3O.sub.4 nanocatalyst that may be supported on a non-reactive support material such as a zeolite or alumina CO.sub.2 and H.sub.2 are preferred sources of carbon and hydrogen atoms for the reaction. The aromatic hydrocarbon compounds produced are suitable for direct usage as fuel without need for further refining.

Concentrates containing specific functionalized diblock copolymers serve as effective additives for improving the cold flow behavior of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

The invention relates to the use of a compound of Formula (I) as described herein and its effective dose in the prevention and/or treatment of fibrosis diseases. The compound can effectively prevent and/or treat a fibrosis disease without cytotoxicity or genotoxicity.

The invention relates to the use of a compound of Formula (I) as described herein and its effective dose in the prevention and/or treatment of fibrosis diseases. The compound can effectively prevent and/or treat a fibrosis disease without cytotoxicity or genotoxicity.

A method for preparing p-xylene is provided. Raw materials containing methanol, naphtha and CO.sub.2 are introduced into a reactor filled with a catalyst for a reaction to produce p-xylene. By adding the methanol, the product distribution is adjusted, and the selectivity of p-xylene is obviously improved. In addition, components containing benzene and toluene in aromatic hydrocarbon products are returned to a reaction system and co-fed with the raw materials for a reaction to produce p-xylene, so that cyclic utilization of the raw materials is achieved, and the method has extremely high economic benefits. The method has a simple process and high feasibility, can greatly improve the selectivity and yield of p-xylene, has an important application value, and provides a new way for large-scale utilization of CO.sub.2.