Long chain paraffin hydrogenation heterogeneous condensation freezing point depressing method and catalyst thereof

Abstract

The invention relates to a long chain paraffin hydrogenation heterogeneous condensation freezing point depressing method and a catalyst thereof and belongs to the technical field of energy. A single-section or two-section serial connection hydrogenation heterogeneous process is adopted; raw oil and hydrogen pass through a hydrogenation heterogeneous catalyst bed layer, wherein the raw oil comprises vegetable oil, Fischer-Tropsch wax oil or waste lubricating oil which are hydrogenated; and an obtained hydrogenation heterogeneous product has the characteristics of low freezing point, high cetane number and the like. An adopted hydrogenation heterogeneous condensation freezing point depressing catalyst is a molecular sieve catalyst, and comprises a molecular sieve carrier and a metal active component. The total weight of a molecular sieve is 20 weight percent to 90 weight percent of the weight of the molecular sieve carrier, and the weight of the metal active component is 0.05 weight percent to 0.5 weight percent of the total weight of the total catalyst. The process is simple, the operation is stable, the freezing point of the raw oil can be effectively reduced to 10DEG C below zero to 20DEG C below zero by selecting appropriate hydrogenation heterogeneous conditions, so that the fluidity of an oil product at low temperature is ensured, and wide industrial application prospect is realized.

Description

technical field [0001] The invention belongs to the technical field of energy, and relates to a method for decondensation through hydroisomerization of long-chain alkanes. More specifically, molecular sieve catalysts are used to hydroisomerize long-chain alkanes in hydrotreated vegetable oil or coal tar under suitable process conditions to reduce the freezing point of oil products so that they can be processed in low temperature environments. be more widely used. Background technique [0002] Hydroisomerization of alkanes is one of the important reactions in the petroleum refining process, and it is mainly used in the production of high-quality fuel oil and high-grade lubricating oil. Among them, the hydroisomerization of light alkanes can produce high-octane gasoline blending components, while the hydroisomerization of long-chain alkanes is mainly used to improve the quality of middle distillates (jet fuel and diesel) and lubricating oils. low temperature flow properties....

AI Technical Summary

Problems solved by technology

Generally speaking, the combination of ZSM-48 and other molecular sieves (such as Beta) can obtain better hydroisomerization performance, but the current research is only to apply the molecular sieve catalyst mainly based on ZSM-48 to the production of lubricating oil

Hydrotreated vegetable oil contains a large amount of long-chain alkanes, which can be added to gasoline and diesel oil as a blending component. Since the long-chain alkanes are mainly straight-chain alkanes, the freezing point is not low enough, which greatly limits the use in cold regions. usage of

Chinese patent 201110425819.9 introduces the hydrogenation treatment of vegetable oil. Although the patent also involves the isomerization depressing treatment of gasoline and diesel components after hydrogenation, the effect is not too obvious.

However, the use of ZSM-48 as the main molecular sieve catalyst to carry out isomerization and depreciation of gasoline and diesel components obtained after vegetable oil hydrotreating has not yet been reported.

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