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Method for recycling liquid fuel oil by catalytically cracking waste polyolefin

A technology for catalytic cracking and waste polyolefin, applied in chemical recovery, chemical instruments and methods, molecular sieve catalysts, etc., can solve problems such as difficulty in controlling the deposition and distribution of silica, and the specific structure of silica has not been clearly stated, and achieve product Good shape and size uniformity, easy industrial production, and good process repeatability

Inactive Publication Date: 2016-02-10
QINGDAO LANNONGGU AGRI PROD RES & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific structure of silica has not been determined, and the above methods are difficult to control the deposition and distribution of silica on the surface of molecular sieves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for recovering liquid fuel oil from waste polyolefins by catalytic cracking is characterized in that it specifically comprises the following steps:

[0020] (1) Preparation of titanium-containing molecular sieve: mix titanium-containing molecular sieve with water according to the weight ratio of 1:10, adjust the pH value of the slurry with hydrochloric acid to be between 4-5, and add 0.4mol / L SnCl to the above slurry 2 2H 2 O solution and 0.5mol / L sodium silicate solution, the temperature is controlled at 120°C for hydrothermal crystallization for 15 hours, and then roasted in a muffle furnace at 500°C for 4 hours;

[0021] (2) Preparation of cerium formate: Add 3% cerium ammonium nitrate to the methanol solution, mix and stir evenly, heat and reflux the mixed solution for 1.8h, centrifuge and wash the white precipitate, and then dry it in an oven at 115°C 4h;

[0022] (3) Catalyst preparation: Dissolve the prepared cerium formate in ethylene glycol, impregna...

Embodiment 2

[0025] A method for recovering liquid fuel oil from waste polyolefins by catalytic cracking is characterized in that it specifically comprises the following steps:

[0026] (1) Preparation of titanium-containing molecular sieve: mix titanium-containing molecular sieve with water according to the weight ratio of 1:11, adjust the pH value of the slurry with hydrochloric acid to be between 4-5, and add 0.5mol / L SnCl to the above slurry 2 2H 2 O solution and 0.6mol / L sodium silicate solution, the temperature is controlled at 130°C for hydrothermal crystallization for 14h, and then roasted in a muffle furnace at 510°C for 3.5h;

[0027] (2) Preparation of cerium formate: Add cerium ammonium nitrate with a mass percentage of 5% to the methanol solution, mix and stir evenly, heat and reflux the mixed solution for 2 hours, centrifuge and wash the white precipitate, and then dry it in an oven at 118°C for 3.5 h;

[0028] (3) Catalyst preparation: Dissolve the prepared cerium formate ...

Embodiment 3

[0031] A method for recovering liquid fuel oil from waste polyolefins by catalytic cracking is characterized in that it specifically comprises the following steps:

[0032] (1) Preparation of titanium-containing molecular sieve: mix titanium-containing molecular sieve with water according to the weight ratio of 1:12, adjust the pH value of the slurry with hydrochloric acid to be between 4-5, and add 0.6mol / L SnCl to the above slurry 2 2H 2 O solution and 0.8mol / L sodium silicate solution, the temperature is controlled at 140°C for hydrothermal crystallization for 13 hours, and then roasted in a muffle furnace at 520°C for 3 hours;

[0033] (2) Preparation of cerium formate: Add cerium ammonium nitrate with a mass percentage of 6% to the methanol solution, mix and stir evenly, heat and reflux the mixed solution for 2.2 hours, centrifuge and wash the white precipitate, and then dry it in an oven at 120°C 3h;

[0034] (3) Catalyst preparation: dissolve the prepared cerium forma...

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PUM

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Abstract

The invention discloses a method for recycling liquid fuel oil by catalytically cracking waste polyolefin. The method is characterized by comprising the following steps: (1) preparing titanium-containing molecular sieves; (2) preparing cerium formate; (3) preparing a catalyst; (4) recycling liquid fuel oil. The preparation of titanium-containing molecular sieve is simple, the repeatability is good, the titanium-containing molecular sieves are modified in a mixed solution of SnCl2.2H2O and sodium silicate under an acidic condition, after modification, the hydrophobicity of the surface of the titanium-containing molecular sieves is prominently enhanced, and the catalytic oxidization activity of the molecular sieves is prominently improved. Cerium nitrate is taken as the raw material to synthesize cerium formate, the method is simple, cerium formate is used to synthesize the catalyst, the dispersity of active components of the catalyst is increased, the activity of the regenerated catalyst is improved therefore; the prepared catalyst is applied to the catalytic cracking reactions of waste polyolefin, the cracking rate of waste polyolefin and selectivity of liquid products are both improved, the stability is high during the catalytic cracking process, the technological repeatability is good, and the technology can be applied to industrial production.

Description

technical field [0001] The invention relates to the technical field of recovering liquid fuel oil, in particular to a method for recovering liquid fuel oil from catalytic cracking waste polyolefin. Background technique [0002] Among the waste plastics, polyethylene and polypropylene account for the largest proportion, accounting for about 70% of the total waste plastics. In order to implement the country's sustainable development strategy, how to deal with and recycle these waste plastics has become a matter of great concern. Among them, thermal cracking or catalytic cracking of waste plastics to recover liquid fuels or chemicals is a way with the most development potential. [0003] In the prior art, small-pore molecular sieves exhibit excellent selectivity for low-carbon olefins. However, small-pore molecular sieves have problems such as small catalyst pore size, easy coking, and rapid deactivation. It is necessary to solve the problem of short catalyst life of small-po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00B01J31/38B01J29/00C07C51/27C07C53/06
CPCY02P20/584
Inventor 宋波
Owner QINGDAO LANNONGGU AGRI PROD RES & DEV