A kind of preparation method of catalytic cracking double metal passivator

Abstract

The application belongs to the technical field of refining aids, and in particular relates to a method for preparing a catalytic cracking bimetal passivator, comprising the following steps: mixing water, organic acid, and antimony trioxide in a certain proportion, adding hydrogen peroxide dropwise to the mixed solution In, antimony pentoxide hydrosol was obtained. Add organic amine to antimony pentoxide hydrosol, and then add system stabilizer to the system to obtain antimony-based passivation agent; add lanthanum carbonate, organic acid, and water to antimony-based passivator to obtain stable bimetallic passivation agent agent. The passivating agent prepared according to the invention has stable properties, strong universality, long shelf life and safe production process. The reagents used in the invention are all industrial-grade products, the production cost is reduced, energy is saved, and the invention is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of refining aids, and in particular relates to a preparation method of a catalytic cracking double metal passivator. Background technique [0002] Catalytic cracking is an important device for lightening raw oil. The processing cost of catalytic cracking and the yield of light oil are related to the market status of the entire oil industry. In the process of catalytic cracking, nickel compounds and vanadium compounds in raw oil are not only With strong dehydrogenation activity, it can reduce the hydrogen-to-carbon ratio of the product, resulting in poor catalyst selectivity, and can also reduce the activity of the catalyst, which in turn leads to an increase in the yield of coke, dry gas and hydrogen, and a decrease in the yield of light oil. [0003] Adding a suitable passivator is an economical and effective way to solve this problem. The existing passivators on the market include monometallic passivators ...

AI Technical Summary

Problems solved by technology

[0002] Catalytic cracking is an important device for lightening raw oil. The processing cost of catalytic cracking and the yield of light oil are related to the market status of the entire oil industry. In the process of catalytic cracking, nickel compounds and vanadium compounds in raw oil are not only With strong dehydrogenation activity, it can reduce the hydrogen-carbon ratio of the product, resulting in poor catalyst selectivity, and can also reduce the activity of the catalyst, which in turn leads to an increase in the yield of coke, dry gas and hydrogen, and a decrease in the yield of light oil

[0003] Adding a suitable passivator is an economical and effective way to solve this problem. The existing passivators on the market include monometallic passivators and bimetallic passivators. Bimetallic catalysts can play a role in nickel and vanadium pollution. Certain passivation protection effect, CN102513163B discloses a water-soluble catalytic cracking metal passivator and its preparation method, the preparation of the antimony pentoxide hydrosol adopts the method of directly adding hydrogen peroxide dropwise to the alcohol amine solution of antimony trioxide method, because hydrogen peroxide is easily decomposed under alkaline conditions, the risk level of multiple bumps during the reaction is high, and chemical accidents are prone to occur if you do not pay attention. safety

CN106475155A discloses a metal passivator and a preparation method thereof. The invention combines metal oxides, oxidants, organic amines, and solvents in a certain proportion to obtain an antimony-based passivator of pentavalent antimony. The metal nickel in the catalytic cracking raw material has a good effect, but the effect on the vanadium pollutants is not obvious, and it has a large selectivity to the catalytic cracking raw material index, and the universality is poor

The stability of traditional metal passivators is short, and the general storage period is 3 to 6 months. During long-term storage and use, a large amount of precipitation will occur, which will seriously even block the pipeline.