Catalytic conversion method for producing low-carbon olefin from chlorine-containing plastic oil

Abstract

The invention relates to a catalytic conversion method for producing low-carbon olefin from chlorine-containing plastic oil, which comprises the following steps of: sequentially contacting the chlorine-containing plastic oil with a pretreatment catalyst and a dechlorinating agent in a fluidization reactor, and carrying out first catalytic conversion reaction and dechlorinating reaction to obtain a first reaction product containing the low-chlorine plastic oil and a first spent catalyst; preheated low-chlorine plastic oil is introduced from the lower part of the dilute-phase conveying bed reactor to be in contact with a catalytic conversion catalyst, a second catalytic conversion reaction is carried out, an obtained second reaction product and a semi-spent catalyst are fed into the dense-phase fluidized bed to be continuously subjected to a third catalytic conversion reaction, and a third reaction product and a second spent catalyst are obtained; separating a reaction product to obtain low-carbon olefin; the spent catalyst is recycled after being burnt and regenerated. According to the method, the chlorine-containing plastic oil is converted into high-value products such as low-carbon olefin, so that the pollution of the waste plastic to the environment is reduced, the high-value utilization of the waste plastic is realized, and the resource consumption is reduced.

Description

technical field [0001] The invention relates to a method for producing low-carbon olefins by catalytic conversion of chlorine-containing plastic oil. Background technique [0002] my country's plastic market demand is increasing year by year, and about 40 million tons of waste plastics are produced every year, but the recycling rate is only about 30%. With the improvement of environmental protection awareness and the continuous increase of environmental pressure, the main disposal methods of plastics are landfill and incineration, but the bulk density of plastic products is low, and it is not easy to decompose, so it is difficult to effectively achieve reduction and harmlessness in the short term. Chemical; incineration will produce a large amount of greenhouse gases, and release harmful gases such as dioxins. None of the above treatment methods can effectively solve the problem of "white pollution", and it is also a serious waste of petrochemical resources. Therefore, the ...

AI Technical Summary

Problems solved by technology

Landfilling is a simple and convenient method, but with the improvement of oil refining capacity, the amount of waste catalysts is increasing year by year, and waste catalysts usually contain metal elements such as Ni and V. Direct landfilling will inevitably result in waste of metal resources and pollution. environment, endangering human health

In the newly released "National Hazardous Waste List" in 2016, the waste catalytic cracking catalyst is classified as HW50 hazardous waste, which must be landfilled in accordance with the disposal requirements of hazardous solid waste, but the construction cost of hazardous solid waste landfill is relatively high

When producing fuel oil as the target product, hydrogenation technology is usually used as the main method to achieve the effect of dechlorination. However, hydrogenation technology has a complicated process due to hydrogen consumption and high requirements on equipment materials, which greatly increases the investment cost.

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