Method for preparing high-quality ethylene raw material with petroleum naphtha hydrogenation

Abstract

The invention relates to a method for generating the high quality ethylene raw material through naphtha hydrogenation. The method takes naphtha fraction and animal and vegetable oil as the raw material oil, under the condition of hydrofining, the raw material oil and hydrogen are mixed and passed through a hydrofining reaction area, the hydrogen-rich gas recycling utilization can be acquired through separating the hydrofining generated oil, and low Sulfur, low hydrogen and low aromatic naphtha can be acquired through removing hydrogen sulfide of the separated liquid with an air stripping tower. Compared with the prior art, the method has the advantages that the oil is mixed in the naphtha hydrogenation raw material, the quality of the product as the ethylene cracking raw material, in particular to aromatic long chain hydrocarbon nC16 to 18 and propane acquired through the animal and vegetable oil hydrogenation, can be remarkably improved, the cracking furnace ethylene output can be increased and the cracking furnace life can be prolonged through adding the aromatic long chain hydrocarbon nC16 to 18 and propane in the ethylene cracking raw material.

Description

Technical field [0001] The invention relates to a method for naphtha hydrofining to provide high-quality ethylene raw materials. Background technique [0002] At present, the main ethylene raw materials used in the world are: ethane, propane, butane, liquefied petroleum gas, condensate, naphtha, hydrocracking tail oil and diesel. Among them, ethane and naphtha are the raw materials for ethylene cracking. The two main ones. The proportion of light hydrocarbons and gaseous raw materials in foreign ethylene raw materials is relatively high, especially the high-quality and cheap raw materials in the Middle East; domestic ethylene raw materials are mainly naphtha. Due to the high content of unsaturated hydrocarbons, sulfur, nitrogen and heavy metal impurities in naphtha, and its poor stability, it is difficult to be used as the feed for the next process. It must be hydrofinished to improve its stability and remove impurities. It is used as ethylene feed, synthetic ammonia feed, refo...

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Problems solved by technology

Although the aromatics can be reduced to less than 1%, since the dearomatization catalyst is a nickel or noble metal catalyst, in order to prevent the catalyst from being poisoned by sulfur, a two-stage process must be adopted, the process is complicated, and the operating conditions are relatively harsh

[0006] CN92104407.0 introduces a catalyst for hydrogenation of unsaturated fats and oils, the process of partially or completely hydrogenating the double bonds in unsaturated fats and fats, which cannot be directly used as diesel oil