Flexible paraffin liquid phase hydrogenation process

Abstract

The invention discloses a flexible paraffin liquid phase hydrogenation process. A paraffin raw material and circulating oil enter a liquid-phase hydrofining reactor under a liquid-phase hydrogenationcondition; the material passing through an upper hydrofining catalyst bed layer is divided into two streams; one material stream is extracted out of the liquid-phase hydrofining reactor from the middle of the bed layer, and fed into a liquid-phase hydroisomerization reactor for isomerization reaction; the other material stream continues flowing downward to pass through a lower hydrofining catalystbed layer; and an obtained hydrofining reaction material and an obtained hydroisomerization reaction material are subjected to gas-liquid separation and fractionation separately to obtain paraffin products with different specifications. The invention provides the hydrogenation process for simultaneously producing more than two paraffin products with different specifications on one set of liquid-phase hydrogenation process equipment for the first time, heat carried by a part of hydrofined materials can be fully utilized, and coupling operation of the liquid-phase hydrofining reactor and the liquid-phase hydroisomerization reactor is realized.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a paraffin liquid-phase hydrogenation process for flexibly producing two high-quality paraffin products. Background technique [0002] Paraffin wax is a solid petroleum product obtained by solvent dewaxing and deoiling of vacuum distillate oil. It is an important raw material for medicine, daily chemical industry and other fine chemical industries. Paraffin wax can be roughly divided into paraffin wax, high melting point petroleum wax, microcrystalline wax and so on. Paraffin wax for these purposes needs to be deeply refined to remove sulfur, nitrogen compounds and condensed aromatic hydrocarbons contained therein, in order to be harmless to the human body. Paraffin refining includes clay refining and hydrofining, among which hydrofining technology is a process in which non-ideal components in raw materials are hydrogenated and converted under certain temperature, p...

AI Technical Summary

Problems solved by technology

However, the above-mentioned paraffin hydrogenation processes can only produce one kind of paraffin product, and the operation flexibility is poor.

[0004] In summary, the existing paraffin hydrogenation technology, including liquid-phase hydrogenation technology, can greatly reduce the content of impurities such as sulfur and nitrogen in paraffin products, reduce the content of polycyclic aromatic hydrocarbons, and improve the properties of paraffin products through hydrogenation and refining. It is also possible to increase the content of isomeric hydrocarbons in paraffin wax products by using heterogeneous catalysts, enhance the toughness of paraffin wax products, and solve the problem of fragility. However, there is only one kind of paraffin wax products produced by the above-mentioned process technology, and the product flexibility is poor.

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