Catalyst for catalytic cracking mixed waste plastic and preparation method thereof

Abstract

The invention discloses a catalyst for manufacturing fuel oil through catalytic pyrolysis of mixed-waste plastics, and a preparation method thereof, and relates to catalytic thermal cracking for manufacturing the fuel oil through waste plastic cracking and a second stage catalyst in thermal cracking catalytic reforming. A first stage catalyst comprises a metallic oxide of 2.0wt percent to 30.0wt percent and carclazyte or montmorillonite of 70.0wt percent to 98.0wt percent; the first stage catalyst is innoxious and cheap, increases the reaction velocity of plastic cracking, reduces the temperature in the scission reaction, improves the selectivity of decomposition products, and is dechlorinated and transformed into innocuous substances. The second stage catalyst is composed of ferric oxide, molybdenum oxide, zinc oxide, cerium oxide, lanthana, nickel oxide or copper oxide, and ZSM-5, MCM-22, USY, REY, Beta or MOR molecular sieves; the second stage catalyst performs the second catalytic pyrolysis and isomerization and the aromatization reversion reactions on pyrolysis gas in the first stage, to increase the distillate rate of pyrolysis gasoline and gas oil. The catalyst and the preparation method thereof have good selectivity, and the raw material does not need classification, washing and drying; the operation is flexible, and the running cost is low; the method is particularly applied to the fuel oil manufacture through the cracking of the mixed-waste plastics in the urban and rural domestic refuse, the composition is complicated; the oil yield of the qualified fuel oil can reach up to more than 70 percent calculated on the basis of the waste plastic.

Description

technical field [0001] The invention relates to a second-stage catalyst for catalytic thermal cracking and thermal cracking catalytic modification for producing fuel oil by cracking waste plastics. The catalytic cracking catalyst of the invention has good controllability, and the oil yield of qualified fuel oil can be as high as 70% based on waste plastics. Above, the oil quality is good, the gasoline is No. 90, and the diesel oil is No. O to minus 20. Background technique [0002] A large amount of waste and old plastics produced in daily garbage seriously endanger the living environment of human beings, and are called "white garbage". White garbage is also the most troublesome environmental governance problem for governments of all countries. In the past ten years, there have been many reports on the method of using waste plastics to crack fuel oil, and many waste plastics cracking and fuel oil plants have been established in China. In the gap or semi-gap kettle operation...

AI Technical Summary

Problems solved by technology

The use of the catalyst of the present invention can solve the problem that the catalyst existing in the catalytic cracking of mixed waste plastics to oil has strict requirements on the pre-selection and pretreatment of waste plastics, and the processing operation is complicated, especially for the cracking and oiling of garbage mixed waste plastics with a small amount of sundries. It is difficult to control; the distribution range of waste plastic cracking products is too wide, a large amount of heavy oil and gas are produced, the ratio of light oil is low, and it is easy to secondary pollution, as well as the problem of low oil yield and unstable quality