KR20230078101A - Pyrolysis Apparatus for Waste Plastics and Preparing Method of Low Boiling Point Oil Using the Same - Google Patents

Abstract

The present invention relates to a waste plastic pyrolysis device and a method for producing low boiling point pyrolysis oil using the same, and more particularly, in order to increase the pyrolysis efficiency of waste plastic and improve the productivity of low boiling point pyrolysis oil, waste plastic is directly heated without contact with oxygen. The thermal decomposition unit and the thermal decomposition product generated in the thermal decomposition unit are separated, and the reaction distillation tower unit that additionally thermally decomposes undecomposed unreacted materials is combined in the lower part to continuously perform thermal decomposition of waste plastics in one device and at the same time, It relates to a waste plastic pyrolysis device characterized by recycling uncondensed gas and undecomposed unreacted material to a pyrolysis unit and a reaction distillation tower unit and a method for producing low-boiling pyrolysis oil using the same.

Description

Pyrolysis Apparatus for Waste Plastics and Preparing Method of Low Boiling Point Oil Using the Same}

The present invention relates to waste plastic recycling, and more particularly, to a waste plastic pyrolysis device capable of increasing the pyrolysis efficiency of waste plastic and improving the productivity of low boiling point pyrolysis oil, and a method for producing low boiling point pyrolysis oil using the same.

As the industrial society develops, the use of plastic is rapidly increasing, and accordingly, the amount of waste plastic, which is waste, is also greatly increasing. This trend is progressing throughout the life, industry and construction fields, and the treatment of waste plastics has emerged as a social problem.

Waste plastics that cannot be recycled are mainly landfilled or incinerated. Accordingly, in the case of incineration, its use is increasingly limited because it causes global warming and environmental pollution due to the generation of environmental hormones, the generation of odors and harmful gases, and the generation of carbon dioxide. In addition, in the case of landfilling, side effects such as landfill shortage and ecosystem destruction occur, and landfill conditions are gradually deteriorating. there is.

Accordingly, as a method of recycling waste plastics without incinerating or landfilling, a method for emulsifying waste plastics using pyrolysis is known, and research and development of the device is actively progressing.

Conventionally used pyrolysis devices include a batch type method in which waste plastic is charged into a pyrolysis reactor and heat is applied from the outside, and a method in which waste plastic is continuously introduced into a pyrolysis reactor and heat is applied from the outside is continuously pyrolyzed.

Since all of these heat the heat necessary for pyrolysis in a short time from the outside, there are problems in that coke is severely formed on the inner wall of the reactor, and pyrolysis is not properly performed due to poor heat transfer efficiency. Many problems such as not being able to operate were expressed.

In addition, in the pyrolysis device for pyrolyzing waste plastic, a distillation column is separately installed at the rear end of the pyrolysis reactor, and the pyrolysis gas is transferred to the distillation column through a pipe, and the pyrolysis gas transferred to the distillation column is transported to the distillation column to produce refined oil such as heavy oil according to the boiling point. However, in order to increase the production of pyrolysis oil, their scales must be maximized, and energy consumption is high in the process of raising and lowering the temperature of these devices, so there is an inherent risk of cost increase and safety accidents.

For example, in Korea Patent Registration No. 0787958, a distillation tower that produces refined oil according to the boiling point of pyrolyzed pyrolysis gas is vertically integrated at the top of the pyrolysis gas outlet of the pyrolysis chamber to continuously pyrolyze waste synthetic polymer compounds by indirect heating. Although a type pyrolysis system has been proposed, the continuous pyrolysis system also performs pyrolysis by an indirect heating method, so the heat transfer efficiency is lowered and the internal temperature of the pyrolysis chamber is low, so high boiling point materials or undecomposed products are produced in large quantities. There was a problem in that it was difficult to produce high-quality fuel.

Accordingly, in Korean Patent Registration No. 1180580, in order to solve the problem caused by indirect heating, molten thermoplastic resin is continuously injected into a fluidized bed cracker to directly pyrolyze the thermoplastic resin on a preheated catalyst, and the directly pyrolyzed decomposition steam is produced as an integrated process. It is continuously introduced into the fractionation column to continuously separate low-boiling oil and wax, and then the high-boiling waxes falling to the top of the fixed bed cracker at the bottom of the fractionation column are re-cracked on a catalyst to recover recycled oil converted to low molecular weight. technique was presented.

However, in the multi-stage catalytic pyrolysis method, as waxes fall into the catalytic fixed-bed cracker provided at the bottom of the fractionation column, coking of the catalytic fixed-bed cracker is caused, so that the re-decomposition of waxes is not properly performed, and as an integrated process, the fluidized bed cracker By introducing only the gaseous pyrolyzed cracked steam into the fractionation column, the undigested liquid high boiling point material remaining in the fluidized bed cracker weakens the heat transfer of the fluidized bed cracker and hinders the pyrolysis reaction rate, thereby inhibiting the production of pyrolysis oil. There was a problem.

Due to this, despite the fact that a number of pyrolysis devices for waste plastics have been developed, pyrolysis efficiency is low and production of low boiling point pyrolysis oil that can be applied as high-quality fuel is low, so it is not properly put to practical use in industrial sites.

Korean Registered Patent No. 0787958 (published date: 2006.03.30) Korean Registered Patent No. 1180580 (published date: 2010.06.09)

The main object of the present invention is to solve the above-mentioned problems, and to increase the pyrolysis efficiency of waste plastic and improve the productivity of low boiling point pyrolysis oil for waste plastic pyrolysis device and low boiling point pyrolysis oil using the same It is to provide a manufacturing method.

In order to achieve the above object, one embodiment of the present invention is a melting unit provided with a transfer screw rotatably by a driving means to transfer and melt waste plastic in an oxygen-free atmosphere; a thermal decomposition unit for rapidly pyrolyzing the waste plastic melt supplied from the melting unit in a direct heating method to generate a thermal decomposition product; a residue discharge unit discharging solid residues generated after thermal decomposition in the thermal decomposition unit; a reaction distillation tower unit connected to the thermal decomposition unit through two passages of a gas flow path and a liquid flow path; a gas recirculation unit that heats the uncondensed gas separated from the upper part of the reaction distillation tower unit and then recycles it to the melting unit, the pyrolysis unit, and the reaction distillation tower unit; and a liquid phase recirculation unit for recirculating unreacted materials remaining in the lower part of the reaction distillation tower unit to the melting unit and the thermal decomposition unit, and the gas flow passage transfers the gas thermally decomposed in the thermal decomposition unit to the reaction distillation tower unit to reach the boiling point of the thermal decomposition product in the reactive distillation tower unit. The liquid flow path allows the undecomposed unreacted material to flow between the pyrolysis part and the reaction distillation tower part, and thermally decomposes the unreacted material in a direct heating method at the bottom of the reaction distillation tower part. A waste plastic pyrolysis device is provided.

In a preferred embodiment of the present invention, the temperature of the lower part of the reaction distillation tower may be characterized in that it is lower than the temperature of the thermal decomposition part.

In a preferred embodiment of the present invention, the reactive distillation column may be characterized in that a portion of the reactive distillation column is heated or cooled by a separate heating or cooling means to maintain an appropriate temperature distribution according to the height of the reactive distillation column.

In a preferred embodiment of the present invention, the uncondensed gas may include hydrogen.

In a preferred embodiment of the present invention, the pyrolysis unit may be characterized in that a fluidized bed reactor.

In a preferred embodiment of the present invention, the uncondensed gas supplied from the gas recirculation unit to the pyrolysis unit and the reactive distillation tower unit may be in direct contact with the melted material and unreacted material of the waste plastic.

In a preferred embodiment of the present invention, the refined oil may be a hydrocarbon oil having 5 to 12 carbon atoms.

Another embodiment of the present invention provides a method for producing low boiling point pyrolysis oil, characterized in that the low boiling point pyrolysis oil is produced using the waste plastic pyrolysis device.

According to the present invention, a pyrolysis unit for directly applying heat to waste plastic without contact with oxygen and a reaction distillation tower unit for separating thermal decomposition products generated in the thermal decomposition unit according to boiling points and additionally pyrolyzing undecomposed unreacted materials at the bottom are combined into one By continuously performing pyrolysis of waste plastics in an apparatus of , costs such as equipment and operating costs can be reduced, and energy consumption can be significantly reduced by causing component separation and pyrolysis reactions to occur in a complex manner.

In addition, the present invention can minimize the generation of tar by rapidly pyrolyzing the waste plastic by direct heating rather than the indirect heating method, and continuously introduces the thermal decomposition product in the gaseous phase generated by the thermal decomposition of the waste plastic to the reaction distillation tower to lower the boiling point. It is possible to continuously recover the high-quality refined oil separated according to the method, and the undecomposed unreacted material in the thermal cracking unit and the high-boiling point thermal decomposition product refluxed in the reaction distillation column are additionally thermally decomposed and converted into low molecules, resulting in complete thermal decomposition and high-quality low-boiling point The pyrolysis oil can be recovered in high yield.

In addition, according to the present invention, the non-condensed gas separated from the thermal decomposition product during the thermal decomposition of waste plastic is recycled to the thermal decomposition unit and the reaction distillation tower unit and used as a direct heating type heat transfer medium and decomposition catalyst, thereby maximizing the thermal contact area and increasing the thermal decomposition reaction rate. Not only can the pyrolysis efficiency of waste plastics be greatly improved by increasing, but also the heat transfer efficiency is increased and undecomposed by repeatedly recycling the high boiling point thermal decomposition products remaining in the pyrolysis unit and the reaction distillation tower unit to the pyrolysis unit after a certain residence time. It is possible to increase the efficiency of pyrolysis of waste plastics and improve the productivity of low-boiling point pyrolysis oil by establishing a circulation process capable of additionally decomposing the unreacted materials.

1 is a schematic process diagram of a waste plastic pyrolysis device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Terms or words used in the specification and claims of the present invention are not limited to the usual or dictionary meaning, and the inventor can properly define the concept of the term in order to explain his/her invention in the best way. Based on the principle, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention.

Terms such as “comprise”, “include” or “having” described in this specification indicate that there is a feature, numerical value, step, operation, component, part, or combination thereof described in the specification. It does not rule out the possibility that other features, figures, steps, operations, components, parts, or combinations thereof may exist or be added that have not been described.

Throughout the specification of the present invention, "A and/or B" means A or B, or A and B, and "thermal decomposition" means chemical substances included in the thermal decomposition target by heating the thermal decomposition target under conditions excluding oxygen. means to decompose

The present invention includes a melting unit in which a conveying screw is rotatably provided by a driving means to transport and melt waste plastic in an oxygen-free atmosphere; a thermal decomposition unit for rapidly pyrolyzing the waste plastic melt supplied from the melting unit in a direct heating method to generate a thermal decomposition product; a residue discharge unit discharging solid residues generated after thermal decomposition in the thermal decomposition unit; a reaction distillation tower unit connected to the thermal decomposition unit through two passages of a gas flow path and a liquid flow path; a gas recirculation unit that heats the uncondensed gas separated from the upper part of the reaction distillation tower unit and then recycles it to the melting unit, the pyrolysis unit, and the reaction distillation tower unit; and a liquid phase recirculation unit for recirculating unreacted materials remaining in the lower part of the reaction distillation tower unit to the melting unit and the thermal decomposition unit, and the gas flow passage transfers the gas thermally decomposed in the thermal decomposition unit to the reaction distillation tower unit to reach the boiling point of the thermal decomposition product in the reactive distillation tower unit. The liquid flow path allows the undecomposed unreacted material to flow between the pyrolysis part and the reaction distillation tower part, and thermally decomposes the unreacted material in a direct heating method at the bottom of the reaction distillation tower part. It relates to a waste plastic pyrolysis device.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Referring to FIG. 1, the waste plastic pyrolysis device 100 according to an embodiment of the present invention includes a melting unit 110, a pyrolysis unit 120, a residue discharge unit 130, a reaction distillation tower unit 140, and a gas recirculation unit. It includes a part 150 and a liquid phase recirculation part 160 as main components.

The melting unit 110 receives the waste plastic from the waste plastic supply unit 111, melts the waste plastic, and transfers the waste plastic to the thermal decomposition unit 120 to be described later. At this time, the waste plastic supplied to the melting unit may be pulverized in the form of flakes or granules in a separate device or process not shown in the drawing, or may be pretreated to facilitate thermal decomposition.

In the melting section 110, in order to prevent contact with oxygen of the waste plastic and maintain an oxygen-free atmosphere, purging is performed with inert gas and/or uncondensed gas recycled from the reaction distillation column, and oxygen is introduced when the waste plastic is introduced. The inlet of the melting unit is sealed to prevent inflow together, and the conveying screw 112 is rotatably provided by the driving means 113 so as to continuously convey and melt the waste plastic.

The melted material of the waste plastic transported while being melted by the conveying screw is introduced into the thermal decomposition unit 120, and the melted material is recycled in an inert gas such as nitrogen and/or in the reaction distillation tower unit 140 to be described later. It is brought into contact with the condensed gas to perform rapid pyrolysis.

The uncondensed gas recycled in the reaction distillation tower unit 140 contains hydrocarbon components such as hydrogen and methane, especially hydrogen, so when it is directly brought into contact with the waste plastic melt after heating, it acts as a heat transfer medium in a direct heating method and decomposes Since it can act as a catalyst, it can increase the pyrolysis efficiency of waste plastics and at the same time reduce the amount of expensive inert gas or catalyst.

In one embodiment, the thermal decomposition unit may be a fluidized bed reactor in which a heat transfer medium is fluidized, and the waste plastic pyrolysis device according to an embodiment of the present invention including such a thermal decomposition unit may be of a batch type or a continuous type. ), etc., but continuous operation may be preferable in terms of pyrolysis oil production.

In addition, in a specific embodiment of the present invention, the waste plastic melt flowing into the pyrolysis unit may contain a catalyst capable of increasing the pyrolysis efficiency. In this case, the catalyst may be selected from known thermal decomposition catalysts such as inexpensive sand, loess, or zeolite, but is not particularly limited thereto.

As described above, the melted waste plastic introduced into the pyrolysis unit 120 is directly heated and pyrolyzed by being contacted with the high-temperature inert gas and/or the recycled high-temperature uncondensed gas. In this case, the temperature of the high-temperature inert gas and/or the uncondensed gas may vary depending on the type of waste plastic, but may be 300° C. to 600° C. near normal pressure. If the temperature of the high-temperature inert gas and/or uncondensed gas is less than 300 ° C, the waste plastic melt is not properly thermally decomposed, and if it exceeds 600 ° C, the waste plastic melt is carbonized at a high temperature and the recovery rate of pyrolysis oil is increased. Deterioration problems may occur.

On the other hand, solid residues remaining after thermal decomposition in the pyrolysis unit can weaken heat transfer and hinder the pyrolysis reaction rate, thereby hindering the production of pyrolysis oil. can As the residue discharge unit 130, a residue discharge unit of a known pyrolysis device may be applied, and for example, a transfer screw or a hopper unit equipped with a scraper may be applied.

The thermal decomposition product generated by the thermal decomposition of the waste plastic melt in the thermal decomposition unit 120 is supplied to the reaction distillation tower unit through the gas flow path 121, and the undecomposed liquid unreacted material in the thermal decomposition unit passes through the liquid flow path 122. It is supplied to the bottom of the reaction distillation column.

The thermal decomposition product (shown by the dotted line arrow) introduced into the reaction distillation column through the gas flow path 121 is partially condensed according to the boiling point of the thermal decomposition product by maintaining the temperature distribution of the reaction distillation column within an appropriate range to form liquid thermal decomposition products and gaseous thermal decomposition products. Separated. At this time, at least a part of the liquid thermal decomposition product is refluxed to the bottom of the reaction distillation column unit, and gas-liquid contact occurs with the gaseous thermal decomposition product flowing into the reaction distillation column unit. In this state, component separation occurs simultaneously according to the boiling point of the thermal decomposition product, The reaction distillation column is directed upward, and the high boiling point pyrolyzate is directed downward, so that refined oil according to the boiling point can be recovered. The recovered refined oil may be further cooled or separated and purified at a later stage depending on the purpose of use.

In the present invention, a decomposition catalyst (not shown) may be included in the reaction distillation column and used to more efficiently convert the thermal decomposition product to a low boiling point. As the decomposition catalyst that can be used in the present invention, any material capable of accelerating the decomposition reaction of thermal decomposition products may be used, and metal catalysts such as nickel, copper, and aluminum, and catalysts such as alumina and zeolite may be used. Further, in a broad sense, catalysts such as platinum and palladium for removing harmful substances such as chlorides and nitrides contained in thermal decomposition products, and adsorbents such as activated carbon may be included.

On the other hand, the liquid unreacted material (double line arrow) introduced to the lower part of the reactive distillation column through the liquid distribution passage 122 is decomposed into low molecules by performing a repyrolysis reaction together with the liquid high-boiling point thermal decomposition product separated in the reactive distillation column. let it Like the pyrolysis reaction performed in the pyrolysis unit, the repyrolysis reaction performed in the lower part of the reaction distillation column directly contacts the unreacted material with the high boiling point pyrolysis product by using high-temperature inert gas and/or recycled uncondensed gas as a heat transfer medium. It can be done by heating method.

At this time, by maintaining the temperature of the lower part of the reaction distillation tower at a lower temperature than the temperature of the thermal cracking part, excessive secondary decomposition reaction in the thermal cracking part can be prevented, and carbonization of waste plastics or conversion to uncondensed gas can be minimized. At this time, the temperature of the lower part of the reaction distillation column may be less than the temperature of the thermal decomposition part within the range of 300 ° C to 500 ° C.

The gaseous pyrolyzate re-pyrolyzed at the bottom of the reaction distillation column is moved to the top of the reaction distillation column and separated according to the boiling point to produce refined oil, and the remaining liquid unreacted material and solid residue are recycled as thermal decomposition products and further pyrolyzed. and external discharge proceeds.

The temperature distribution of the reaction distillation column unit 140 as described above may vary according to the boiling point of the components of the final refined oil, like the known temperature distribution of the distillation column, and the height of the reaction distillation column unit, the composition and temperature of introduced thermal decomposition products and unreacted products, It can be determined by various variables such as the pressure of the reaction distillation column and the reflux condition of the reaction distillation column. In order to obtain a temperature distribution within a desired range, the above variables must be appropriately adjusted, and regardless of this, a method of separately heating or cooling the reaction distillation column may be used to control the temperature distribution arbitrarily.

The upper part of the reaction distillation column can be applied without limitation to any structure as long as it has a component separation function by efficient gas-liquid contact, for example, a plate-type column that is a gas-liquid contact means generally used in chemical processes ( Plate column or packed column (column internal) can be used as the reaction distillation tower part of the present invention as it is, and the lower part of the reaction distillation tower part can be applied without limitation to any structure as long as it is a direct heating type pyrolysis reactor structure. And, preferably, it may be a fluidized bed reactor structure.

The uncondensed gas having less than 5 carbon atoms that is not condensed in the upper part of the reaction distillation column is heated through the gas recirculation part 150, and then the lower part of the melting part 110, the pyrolysis part 120 and the reaction distillation tower part 140 Either one can be recycled.

The gas recirculation unit 150 may include a storage unit (not shown) capable of storing uncondensed gas for a certain period of time and/or a heating unit 151 that heats the uncondensed gas. At this time, the storage unit and the heating unit of the gas recirculation unit may be a general storage unit and a heating unit, and may be provided in plural numbers according to the recirculated place, and may be operated by adjusting according to conditions of the recirculated uncondensed gas such as heating temperature.

Meanwhile, the high boiling point unreacted material remaining in the lower portion of the reaction distillation column may be supplied to the melting unit 110 and/or the thermal decomposition unit 120 through the liquid phase recirculation unit 160 to perform additional thermal decomposition.

As described above, the waste plastic pyrolysis device according to the present invention recirculates the high-temperature uncondensed gas separated from the thermal decomposition product during the thermal decomposition of waste plastic to at least one of the melting section, the thermal decomposition section, and the reaction distillation tower section, thereby providing a direct heating method. By using it as a heat transfer medium and a decomposition catalyst, the thermal decomposition efficiency of waste plastics can be greatly improved by maximizing the thermal contact area and increasing the thermal decomposition reaction rate. It is possible to increase the heat transfer efficiency and additionally decompose the undecomposed unreacted materials by repeatedly recirculating the melting section and/or the pyrolysis section to increase the pyrolysis efficiency of waste plastics and improve the productivity of low boiling point pyrolysis oil having 5 to 12 carbon atoms. there is.

In the apparatus of FIG. 1 having such a configuration, an operation of supplying and thermally decomposing waste plastic to produce low-boiling pyrolysis oil will be described in detail.

In the waste plastic pyrolysis device according to the present invention, when the waste plastic is supplied to the melting unit, the conveying screw is rotated by the driving means to melt the waste plastic, and the molten waste plastic melt is transferred to the pyrolysis unit. The melt of the waste plastic transferred to the pyrolysis unit is rapidly pyrolyzed in a direct heating method by high-temperature uncondensed gas and inert gas recycled from the reaction distillation tower unit to produce pyrolysis products, undecomposed unreacted materials and solid residues, The resulting solid residue is discharged to the residue discharge unit. At this time, the thermal decomposition product (dotted line arrow) generated in the thermal decomposition unit flows into the reaction distillation tower unit through the gas flow path, and the introduced thermal decomposition product is separated according to the boiling point of the thermal decomposition product in the reactive distillation tower unit to produce refined oil. Meanwhile, the undecomposed unreacted material (double line arrow) generated in the thermal decomposition unit flows into the lower portion of the reaction distillation tower unit through the liquid distribution passage. The introduced unreacted material is re-pyrolyzed in a direct heating method by high-temperature non-condensed gas and inert gas recycled at the bottom of the reaction distillation column to produce thermal decomposition product, undecomposed unreacted material, and solid residue. The generated thermal decomposition product is separated according to the boiling point in the reaction distillation column to produce refined oil, and undecomposed unreacted materials and solid residues are recycled to the thermal decomposition unit.

As described above, the present invention increases energy consumption efficiency according to the operation of facilities for producing pyrolysis oil by producing pyrolysis oil using the above-described pyrolysis device for waste plastic, increases pyrolysis efficiency of waste plastic, and productivity of low boiling point pyrolysis oil. can improve

Above, a preferred embodiment of the waste plastic pyrolysis device according to the present invention and the manufacturing method of low boiling point pyrolysis oil using the same has been described, but this is described as at least one embodiment, whereby the technical idea of the present invention and its configuration and operation are limited. It does not, and the scope of the technical idea of the present invention is not limited / limited by the drawings or the description referring to the drawings. In addition, the concepts and embodiments of the present invention presented in the present invention can be used by those skilled in the art as a basis for modifying or designing other structures to achieve the same purpose of the present invention. However, the modified or changed equivalent structure by a person skilled in the art to which the present invention belongs is bound by the technical scope of the present invention described in the claims, and the spirit or scope of the invention described in the claims. Various changes, substitutions and changes are possible within the limits that do not deviate from the above.

100: waste plastic pyrolysis device
110: melting section
111: waste plastic supply unit
120: pyrolysis unit
121: gas distribution path
122: liquid distribution path
130: residue discharge unit
140: reaction distillation column
150: gas recirculation unit
151: heating unit
160: liquid recirculation unit

Claims (8)

a melting unit in which a conveying screw is rotatably provided by a driving means to transport and melt waste plastics in an oxygen-free atmosphere;
a thermal decomposition unit for rapidly pyrolyzing the waste plastic melt supplied from the melting unit in a direct heating method to generate a thermal decomposition product;
a residue discharge unit discharging solid residues generated after thermal decomposition in the thermal decomposition unit;
a reaction distillation tower unit connected to the thermal decomposition unit through two passages of a gas flow path and a liquid flow path;
a gas recirculation unit that heats the uncondensed gas separated from the upper part of the reaction distillation tower unit and then recycles it to the melting unit, the pyrolysis unit, and the reaction distillation tower unit; and
A liquid phase recirculation unit for recycling unreacted materials remaining at the bottom of the reaction distillation tower unit to the melting unit and the thermal decomposition unit,
The gas flow passage transfers the gas thermally decomposed in the thermal decomposition section to the reaction distillation column section, and separates the gas thermally decomposed from the reaction distillation column section according to the boiling point of the thermal decomposition product to produce refined oil. The pyrolysis device of waste plastic, characterized in that in the lower part of the reaction distillation column, the unreacted material is thermally decomposed by a direct heating method.
According to claim 1,
The thermal decomposition device of waste plastic, characterized in that the temperature of the lower part of the reaction distillation column is less than the temperature of the thermal decomposition unit.
According to claim 1,
The pyrolysis device of waste plastic, characterized in that the reactive distillation column unit heats or cools a part of the reactive distillation column unit by a separate heating or cooling means to maintain an appropriate temperature distribution according to the height of the reactive distillation column unit.
According to claim 1,
The pyrolysis device of waste plastic, characterized in that the uncondensed gas contains hydrogen.
According to claim 1,
The pyrolysis device of waste plastic, characterized in that the pyrolysis unit is a fluidized bed reactor.
According to claim 1,
The pyrolysis device of waste plastic, characterized in that the non-condensed gas supplied from the gas recirculation part to the pyrolysis part and the reaction distillation tower part directly contacts the melt and the unreacted material of the waste plastic.
According to claim 1,
The refined oil is a pyrolysis device for waste plastic, characterized in that hydrocarbon oil having 5 to 12 carbon atoms.
A method for producing low boiling point pyrolysis oil, characterized in that the low boiling point pyrolysis oil is produced using the waste plastic pyrolysis device according to any one of claims 1 to 7.

Images