Processing method of waste plastic

A treatment method and technology of waste plastics, applied in the direction of plastic recycling, recycling technology, etc., can solve the problems of complex product distribution, high reaction temperature, etc., and achieve the effects of simple process flow, lower reaction temperature, and simple preparation method

Active Publication Date: 2018-08-28
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the pyrolysis process itself requires high heat, the reaction temperature is usually high, and the distribution of its products is complex. Therefore, it is not only necessary to reduce the energy required for the decomposition

Method used

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preparation example Construction

[0023] The preparation method of modified catalyst A used in the embodiment is: take 1g of HZSM-5 and HY molecular sieve respectively and mix, then add concentration and be that in the sodium hydroxide aqueous solution of 0.2mol / L, carry out partial desiliconization treatment, treatment temperature is 60°C for 1 hour, then filter, wash, and dry at 100°C for 12 hours; weigh 0.2g of tin chloride and 0.015g of sodium silicate plus deionized water to make an aqueous solution, and then dip into The above-mentioned composite molecular sieves were dried at 100°C for 12 hours, and then calcined at 450°C for 3 hours to obtain the modified catalyst A powder, which was pressed into tablets and sieved to obtain solid particles with a particle size of 40 mesh to 60 mesh. The particles were used as modified catalyst A.

[0024] The preparation method of modified catalyst B used in the embodiment is: change the tin chloride of 0.2g in the preparation method of modified catalyst A into the ti...

Embodiment 1

[0028] Get 2g polyethylene terephthalate plastics (PET) and join in the catalytic cracking reactor as the waste plastic raw material of reaction, and add modified catalyst A and reaction solvent, reaction solvent is 30wt% tetralin and 70wt% n-hexadecane A mixture of alkanes, wherein the amount of modified catalyst A added is 10% of the waste plastic mass, and the amount of reaction solvent is 2g. After mixing evenly, the reaction is carried out under the following reaction conditions: the reaction temperature is 250 ° C, and the reaction time is 180 minutes. The reaction was carried out under stirring with a stirring rate of 700 rpm, hydrogen gas was introduced into the reaction, and the hydrogen partial pressure was 5.6 MPa. The obtained cleavage product is separated by gas-liquid-solid to obtain liquid phase product, gas and insoluble matter; and then the obtained liquid phase product is extracted through cyclohexane and tetrahydrofuran respectively to obtain cyclohexane solu...

Embodiment 2

[0029] Change modified catalyst A in embodiment 1 into modified catalyst B, and others are the same as embodiment 1. The reaction results are shown in Table 1.

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Abstract

The invention discloses a processing method of waste plastic. The method comprises the following steps: adding the waste plastic, a modified catalyst and a reaction solvent into a catalytic pyrolysisreactor, so as to be uniformly mixed, and then performing catalytic pyrolysis reaction. The modified catalyst adopts a modifier oxide modified HZM-5 and HY composite molecular sieve, a modifier is selected from one or more in Sn, Fe, Ti and Zn, and the reaction solvent adopts a mixture of tetrahydronaphthalene and n-hexadecane. The conditions of the catalytic pyrolysis reaction are as follows: thereaction temperature is 150 to 300 DEG C; the reaction time is 120 to 240 minutes; the reaction is performed under stirring; the stirring speed is 600 to 1000 revolutions per minute; hydrogen is fedduring reaction; hydrogen partial pressure is 4 to 7MPa. The method obviously reduces the catalytic pyrolysis temperature of waste plastic on the promise of guaranteeing a high conversion rate, and saves energy.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, in particular to a treatment method for waste plastics. Background technique [0002] Energy shortage and environmental pollution are two major problems China is currently facing. The waste generated by the use of a large number of plastic products not only seriously pollutes the environment, but also causes a waste of resources. At present, the consumption of plastic products is huge, 80% of which are olefin polymers, and a large amount of waste plastics are produced every year, and the recycling rate of plastics is generally low, resulting in a huge waste of resources. In addition to burial, incineration and other methods that seriously pollute the environment, waste plastic pyrolysis technology is an important technology for the resource utilization of waste plastics. However, the pyrolysis process itself requires high heat, the reaction temperature is usually high, and the dist...

Claims

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Application Information

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IPC IPC(8): C08J11/20C08J11/16
CPCC08J11/16C08J11/20C08J2323/06C08J2367/02Y02W30/62
Inventor 刘清龙罗明生张绍伟
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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