Industrialized method for producing fuel oil by using waste plastics

Abstract

The present invention relates to an oil refining technology by utilizing waste plastic, in particular to an industrialized fuel oil producing method by utilizing the waste plastic. The present invention solves the shortcoming existed in the prior art that the effect for using the waste plastic to produce the fuel oil is bad. The steps includes: dehydrated mineral oil is used as the medium of liquidized waste plastic to be put into a reactor, the mineral oil being used for liquidizing the waste plastic is preheated in the reactor, the waste plastic is put into the reactor, the waste plastic in the reactor is stably heated and time-lapsed cracked, gaseous hydrocarbon produced from the reaction is fed into a flash distillation column, light distillated oil produced from the flash distillation column is distilled in the normal atmosphere. The present invention adopts molten salt as the heat-conducting medium, so as to enable the plastic being heated evenly, the operation temperature is controlled at 500 DEG C, the liquid liquidoid temperature inside the reactor is controlled at 370 DEG C for delaying the cracking operation and stabilizing the cracking temperature, the liquid inside the reactor is cracked under the stable condition, so as to overcome disadvantages in the prior art that using the coal fire to burn directly, the stability of the oil product is bad and the yield of the liquid is low.

Description

technical field [0001] The invention relates to a technique for refining oil by using waste plastics, in particular to a method for industrially using waste plastics to produce fuel oil. Background technique [0002] Since the 1970s, many scientific researchers around the world have devoted a lot of manpower and material resources to the research of using waste plastics to produce fuel oil. There are about 200 patent documents published in my country alone, and it is unanimously recognized that waste plastics are used to produce fuel oil. Fuel oil is a better method for recycling waste plastics. According to the current published patent documents, the existing method of refining oil from waste plastics basically applies two technical solutions of thermal cracking and catalytic cracking in petroleum refining. Theoretically speaking, it seems reasonable to transplant these two technologies to the oil refining process using waste plastics, but it has been proved by practice that...

AI Technical Summary

Problems solved by technology

As far as the currently published patent documents and examples are concerned, there are no plastic liquefaction measures before thermal cracking and catalytic cracking. Most of the examples use extruders to push waste plastics into reactors for heating and cracking, or at the same time, catalysts Put it into the reaction kettle in a certain proportion for catalytic cracking. As we all know, plastics have poor thermal conductivity and have the characteristics of gradual endothermic liquefaction. Even after liquefaction, the liquid does not exist as molecular monomers of different sizes like petroleum hydrocarbons.

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