Preparation and application of heavy metal pollution-resisting dual functional solid cocatalyst

Abstract

The invention relates to preparation and application of a dual functional solid cocatalyst which can resist pollution of vanadium and nickel in the process of cracking and converting heavy oils. The solid cocatalyst is characterized by being prepared from the following components in percentage by weight: 10 to 50 percent of high-activity lanthanum oxide, 0.1 to 20 percent of fine-grained antimonyoxide, 1 to 30 percent of high-activity Y molecular sieves of which the outer surfaces are modified with rare earth, and the balance of aluminum oxide-based binder which consists of acidified pseudoboehmite and / or alumina sol, wherein the high-activity lanthanum oxide is formed through gradual decomposition of the lanthanum carbonate which is directly added under the action of high temperature inpreparation and using processes; and the fine-grained antimony oxide is prepared from antimony trioxide and / or pentavalent colloidal antimony oxide which are / is directly added and have / has the average diameter of less than 1 micron. After the solid composition slurry is homogeneously ground, the slurry is subjected to spray drying to form a microspheric solid cocatalyst which comprises uniformly distributed heavy metal pollution-resisting active components with multiple apertures, and a cracking activity center to which macromolecules can get close. When the dual functional solid cocatalyst is used in the cracking and conversion process of catalytic cracking / pyrolysis of the heavy oil, toxication of the vanadium and the nickel in heavy fed stock on a catalyst in a system can be reduced, the distribution of a reaction product can be improved simultaneously, and the conversion efficiency of a heavy fed material and the yield of light hydrocarbon in the product are effectively improved.

Description

technical field [0001] The invention relates to the preparation and application of a heavy metal pollution-resistant co-catalyst, in particular to the preparation and application of a dual-functional solid co-catalyst for resisting vanadium and nickel pollution in the cracking and conversion process of heavy oil. Background technique [0002] In recent years, due to the heavy and inferior quality of crude oil worldwide, heavy and inferior crude oil has inevitably become part or even all of the raw materials in the refining process of refineries. The heavy and inferior quality of crude oil makes the content of heavy metals in the heavy oil (>350°C fraction) increase significantly. In the past, China's heavy oil has high nickel content, such as crude oil produced in Daqing, Shengli, Liaohe and other oilfields, etc., have encountered raw oil with high nickel content. In recent years, the amount of high-vanadium crude oil imported from the Middle East by China has increased ...

AI Technical Summary

Problems solved by technology

In this way, it has not really overcome the poisoning problem caused by the use of liquid blunt nickel additives, and due to its own insufficient cracking activity and the introduction of alkaline earth metals, it is easy to cause insufficient equilibrium conversion rate of the device system when adding and using, which affects the operation. proceed smoothly

[0015] At present, the hydrorefining capacity of my country's refineries is limited and the cost is high, which is far from meeting the needs of actual production. The national conditions make most of my country's refineries limited in the selection of raw material oil, resulting in a period of time. heavy metal content will remain high