A flexible vaseline liquid phase hydrogenation process

Abstract

The invention discloses a flexible vaseline liquid phase hydrogenation process. A vaseline raw material and circulating oil are mixed and enter a liquid-phase hydrofining reactor, and 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, entersa liquid-phase hydroisomerization reactor and is subjected to isomerization; the other material stream flows downwards through a hydrofining catalyst bed layer at the lower part; and an obtained hydrofining reaction material and an obtained hydroisomerization reaction material are subjected to gas-liquid separation and fractionation separately to obtain vaseline products with different specifications. The invention provides the liquid-phase hydrogenation process for simultaneously producing more than two types of vaseline products with different specifications on one set of hydrogenation process equipment for the first time, heat carried by part of hydrofined materials can be fully utilized, and coupling operation of the liquid-phase hydrofining reactor and the liquid-phase hydroisomerization reactor can be realized.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a petroleum jelly liquid-phase hydrogenation process for flexibly producing two high-quality petroleum jelly products. Background technique [0002] Vaseline is an ointment-like petroleum product with certain characteristics, and it is an important raw material for the production of pharmaceuticals, daily chemicals and other fine chemicals. Vaseline raw materials are mainly blended with residual oil wax paste and lubricating oil. The commonly used refining methods of Vaseline include acid-clay refining, aluminum trichloride refining and hydrogenation refining. Due to the low yield of the first two refining methods, a large amount of waste that is difficult to handle is generated, which leads to high production costs and serious environmental pollution, and has been gradually replaced by the hydrofining method. [0003] Due to the high content of sulfur, nitrogen com...

AI Technical Summary

Problems solved by technology

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

[0004] In summary, the existing petroleum jelly hydrogenation technology, including liquid-phase hydrogenation technology, can greatly reduce the content of impurities such as sulfur and nitrogen in petroleum jelly products, reduce the content of condensed ring aromatics, and improve the properties of petroleum jelly products through hydrogenation and refining. It is also possible to increase the content of isomeric hydrocarbons in petroleum jelly products and increase the stringiness of petroleum jelly products by using isomerization catalysts, but there is only one kind of petroleum jelly products produced by the above-mentioned process technology, and the product flexibility is poor

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