WO2020250248A1 - An improved clog-free condensation system for pyrolysis vapour of pet containing polymer - Google Patents
An improved clog-free condensation system for pyrolysis vapour of pet containing polymer Download PDFInfo
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- WO2020250248A1 WO2020250248A1 PCT/IN2020/050523 IN2020050523W WO2020250248A1 WO 2020250248 A1 WO2020250248 A1 WO 2020250248A1 IN 2020050523 W IN2020050523 W IN 2020050523W WO 2020250248 A1 WO2020250248 A1 WO 2020250248A1
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- WIPO (PCT)
- Prior art keywords
- condenser
- pyrolysis
- oil
- liquid
- outlet
- Prior art date
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 79
- 238000009833 condensation Methods 0.000 title claims abstract description 33
- 230000005494 condensation Effects 0.000 title claims abstract description 33
- 229920000642 polymer Polymers 0.000 title claims abstract description 20
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000005711 Benzoic acid Substances 0.000 claims abstract description 50
- 229960004365 benzoic acid Drugs 0.000 claims abstract description 50
- 235000010233 benzoic acid Nutrition 0.000 claims abstract description 50
- 239000002904 solvent Substances 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000007791 liquid phase Substances 0.000 claims abstract description 14
- 239000012071 phase Substances 0.000 claims abstract description 11
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 64
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 64
- -1 Polyethylene terephthalate Polymers 0.000 claims description 22
- 230000001376 precipitating effect Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 5
- 238000005191 phase separation Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000003828 vacuum filtration Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 22
- 229920003023 plastic Polymers 0.000 abstract description 13
- 239000004033 plastic Substances 0.000 abstract description 13
- 229930195733 hydrocarbon Natural products 0.000 abstract description 12
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 12
- 239000002699 waste material Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 21
- 239000000047 product Substances 0.000 description 10
- 239000006227 byproduct Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 239000013502 plastic waste Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005188 flotation Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 230000034659 glycolysis Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000006140 methanolysis reaction Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 description 1
- 239000004299 sodium benzoate Substances 0.000 description 1
- 235000010234 sodium benzoate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/047—Breaking emulsions with separation aids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0093—Removing and treatment of non condensable gases
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
- C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/002—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal in combination with oil conversion- or refining processes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/10—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal from rubber or rubber waste
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1003—Waste materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
Definitions
- the present invention relates to a clog-free condensation system for pyrolysis vapour of Polyethylene terephthalate (PET) containing polymer that provides an efficient pyrolysis of feedstock containing Polyethylene terephthalate (PET) polymer. More specifically, the present invention provides an improved condensation system for preventing clogging of pyrolysis apparatus and smooth running of thermal degradation waste plastic comprising PET containing polymer. The present invention also relates to a method for pyrolysis of PET mixed plastic waste without formation of clog in apparatus and continuous recovery of Benzoic- acid and other condensable hydrocarbons as a value added products.
- PET Polyethylene terephthalate
- MLP multilayer packaging
- PET recycling includes different methods of hydrolysis, glycolysis and methanolysis to produce depolymerised product i.e. monomers of PET.
- PET Polyethylene terephthalate
- these processes demand pure PET waste and intensive cleaning steps even when only PET based plastic needs to process as pyrolysis system never works if Polyethylene terephthalate (PET) is present in the feedstock which results in clogging of the condenser, receiver, and internal piping used for condensing the post pyrolysis stream.
- PET Polyethylene terephthalate
- maintaining the purity of the flakes (waste PET flakes) is important for preserving the reclaimed plastic’s value, as non-reusable elements can reduce workability and, ultimately, profitability.
- used containers as received at the recycling plant ordinarily include PET bottles, aluminium caps and contaminants such as paper labels, adhesives holding the labels.
- the other polymers (polyolefin) and PET components are separated from one another.
- PET plastic reclamation procedures involving separation/sorting of different types of resin based on different density level or by chemical treatment in order to separate PET from non-usable elements.
- US 4,830, 188A discloses plastics separation and recycling methods wherein mixed flakes are placed into a flotation liquid so that each flake sinks or floats according to its density by maintaining the effective level of surfactant in the flotation liquid. Those flakes denser than the flotation liquid tend to sink, whereas those flakes less dense than the flotation liquid will tend to float. Each separated resin product is suitable for normal processing by conventional plastic molding and extrusion techniques.
- Polymer-based multilayer packaging materials are commonly used in order to combine the respective performance of different polymers i.e. combination of polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PC), acrylonitrile butadiene styrene (ABS), poly(methyl methacrylate) (PMMA), nylon, metallised PET etc.
- PET polyethylene terephthalate
- PS polystyrene
- PE polyethylene
- PP polypropylene
- PC polyvinyl chloride
- ABS acrylonitrile butadiene styrene
- PMMA poly(methyl methacrylate)
- nylon metallised PET etc.
- US 5,753,086A discloses an apparatus for pyrolysis (thermal decomposition 350 to 700° C) waste plastic in a diluent such as hot oil, acid and gases.
- a diluent such as hot oil, acid and gases.
- Municipal, health and industrial waste plastics are processed such as (but not limited to) polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polyurethane (PU), and polyvinyl chloride (PVC).
- PE polyethylene
- PP polypropylene
- PS polystyrene
- PET polyethylene terephthalate
- PU polyurethane
- PVC polyvinyl chloride
- the present invention has been made in consideration of the above- described pyrolysis apparatus clogging problem, and an objective thereof is to provide a system and method for preventing the sublimation of Benzoic-acid in condenser pipe and thereby preventing the clogging of pyrolysis apparatus when PET containing mixed plastic has been utilised as a feedstock. Accordingly, with the advent of more carefully design and configuration of condenser in post pyrolysis system, the clog formation is prevented and thereby feedstock containing PET polymer can be successfully pyrolyzed back into its oil/hydrocarbon components.
- One of the objectives of the present invention is to provide a condensation system with clog removal functionality useful in pyrolysis of PET containing plastics and method thereof.
- Second objective of the present invention is to provide the pyrolysis system suitable for conducting pyrolysis of feedstock containing PET polymer.
- Another objective of the present invention is to provide the method of condensation for isolation of Benzoic-acid from hydrocarbon condensable materials from PET containing plastics. Yet, one more objective of the present invention is to prevent the incineration or landfill of polymers such as PET containing plastic waste to safeguard an environment.
- the present invention has been made in order to solve the above- described problems at once, and a main object thereof is to make it possible to continuously run the pyrolysis reactor when Polyethylene terephthalate (PET) is contained in feedstock without making a system to stop to clean the condensers.
- PET Polyethylene terephthalate
- a pyrolysis reaction vapour condensation system is one suitable for clog-free pyrolysis of polymer such as Polyethylene terephthalate (PET) in pyrolysis feedstock that produces a vapour of pyrolysis oil and by-products including Benzoic-acid and its derivatives (Sodium benzoate etc), the system comprising of condenser for condensing a pyrolysis reaction vapour with direct stream of oil-immiscible solvent at an initial step followed by liquid-liquid separator for separating a phases of the said condensed stream, the said system further characterized in precipitating out a by-product of pyrolysis reaction and recirculating at least a part of oil immiscible solvent stream into the condenser at the initial step.
- the present invention also provides a method to operate the said system in detail.
- the present invention provides an improved clog -free condensation system for pyrolysis vapour to enable continuous pyrolysis reaction of polymer having fraction of Polyethylene terephthalate (PET) comprises of: a. a conduit (2) carrying vapor stream received from pyrolysis reactor
- Liquid-liquid phase separator (7) connected to outlet (5) of condenser (3) and having outlets (8 and 9) for separating two immiscible phases;
- the vapour stream coming in condenser (3) is humidified with stream of oil-immiscible solvent to obtain a liquid stream containing a mixture of pyrolysis oil with oil-immiscible solvent rich in Benzoic- acid and its derivatives before it solidifies into sticky powder and thereby avoiding a clog formation.
- the condensation system as per present invention includes a precipitating part for by-product to obtained in a pure powder form, wherein outlet (9) of phase separator is configured with precipitating bath (10) to precipitate out Benzoic -acid and its derivatives from oil-immiscible solvent.
- the outlet of precipitating bath (10) is configured with solid-liquid separator (11) to obtain a powder of Benzoic -acid and its derivatives at outlet (12) and liquid stream of oil-immiscible solvent at outlet (13).
- liquid-liquid phase separator (7) is positioned with parallelly placed second liquid-liquid phase separator (7’) having outlets (8’ and 9’) using flow diversion valve (22) to increase residence time of phase separation.
- the precipitating bath (10) is selected from the temperature controlled bath and bath having provision of supplying solution to the bath.
- the solid-liquid separator (11) is selected from Filter press, centrifuge , nutche filter, agitated nutche filter, pressure leaf filter, gravity filter and vacuum filtration system.
- the filtrate outlet of solid-liquid separator (11) is connected to inlet (4) of condenser (3) through a pump (14) and heat exchanger (15).
- the present invention relates to an improved condensation system wherein the condenser (3) is configured with additional condensers (16, 19) in series. Characterized in that condenser in series are selected and not limiting from shell and tube condenser, central flow condenser, down flow condenser, inverted flow condenser and evaporative condenser, Jet condenser, direct contact condenser or combination thereof.
- Figure No. 1 a schematic diagram illustrating the configuration of condensation system for clog-free pyrolysis of pet in the present embodiment.
- Figure No. 2 a schematic diagram illustrating the configuration of a precipitation bath and recirculation of oil-immiscible solvent stream in the present embodiment.
- Figure No. 3 a schematic diagram illustrating the configuration of a two liquid- liquid separators in the present embodiment.
- Figure No. 4 a schematic diagram illustrating the configuration of sequential condensers in the present embodiment.
- the present subject matter relates to an improved condensation system for clog -free pyrolysis of PET containing mixed plastic waste.
- pyrolysis vapours/gas is discharged through a pipeline.
- the fundamental pyrolysis reaction is very complex and provides several products in vapour; the main components of the pyrolysis gas are oils like different hydrocarbons, methane, hydrogen, carbon monoxide and carbon dioxide and different by-products depending on feedstock.
- the pyrolysis gas enters a condenser for condensation.
- Benzoic -acid is one of the product of pyrolysis of PET, which is coming mixed as vapor and when condensed in conventional pyrolysis system at temperature about 30 to 250 °C, forms a sticky mass due to having low solubility at low temperature.
- Boiling point of Benzoic- acid is about 250°C and melting point is about 122°C.
- solubility of Benzoic-acid in water is also temperature dependent i.e. at 40°C solubility is about 5g/L, at 75°C solubility is about 21g/L and 100°C solubility is about 56g/L. Therefore, when vapour of pyrolysis of PET are condensed at below 200 °C, it forms a sticky mass and adhere to internal lining of apparatus, which lead to clogging of entire pyrolysis system.
- the present invention has been made in order to solve the above- described problems at once, and a main object thereof is to make it possible to continuously run the pyrolysis reactor when Polyethylene terephthalate (PET) is contained in feedstock without making a system to stop to clean the condensers.
- PET Polyethylene terephthalate
- the novel and improved condenser system installation in pyrolysis of PET containing mixed plastic feedstock is effectively avoids the clogging of pyrolysis plant.
- a pyrolysis reactor (1) is provided which may be of conventional shape and of any suitable material.
- the present invention provides an improved clog-free condensation system to enable continuous pyrolysis reaction of polymer having fraction of Polyethylene terephthalate (PET) comprises of:
- the vapour stream coming in condenser (3) is humidified with stream of oil-immiscible solvent to obtain a liquid stream containing a mixture of pyrolysis oil with oil-immiscible solvent rich in Benzoic -acid and its derivatives before it solidifies into sticky powder and thereby avoiding a clog formation.
- the condensation system as per present invention includes a precipitating part for by-product to obtained in a pure powder form, wherein outlet (9) of phase separator is configured with precipitating bath (10) to precipitate out Benzoic -acid and its derivatives from oil- immiscible solvent.
- the outlet of precipitating bath (10) is configured with solid- liquid separator (11) to obtain a powder of Benzoic-acid and its derivatives at outlet (12) and liquid stream of oil-immiscible solvent at outlet (13).
- Such configuration makes it possible to recover the pyrolysis by-products into a pure saleable compound.
- the filtrate outlet of solid-liquid separator (11) is connected to inlet (4) of condenser (3) through a pump (14) and heat exchanger (15).
- the precipitating bath (10) is selected from the temperature controlled bath and bath having provision of supplying solution to the bath.
- the solid-liquid separator (11) is selected from Filter press, centrifuge , nutche filter, agitated nutche filter, pressure leaf filter, gravity filter and vacuum filtration system.
- liquid-liquid phase separator (7) is positioned with parallelly placed second liquid-liquid phase separator (7’) having outlets (8’ and 9’) using flow diversion valve (22) to increase residence time of phase separation.
- the present invention relates to an improved condensation system wherein the condenser (3) is configured with additional condensers (16, 19) in series.
- condenser in series are selected and not limited to shell and tube condenser, central flow condenser, down flow condenser, inverted flow condenser and evaporative condenser, Jet condenser, direct contact condenser or combination thereof.
- the present invention also provides a method to operate the system as disclosed in figure no. 1-3.
- the method to operate system is comprising of condensation of pyrolysis vapour coming from pyrolysis reactor (1) through a conduit (2) comprising contacting a fraction of Benzoic-acid and it’s derivative with direct contact of oil-immiscible solvent stream received from inlet (4) with vapour stream in the condenser (3) at predetermined temperature, the pyrolysis oil and the Benzoic-acid and its derivative mix in oil-immiscible solvent such as water, alkaline water (pH 7-14), and then enter the outlet pipe (5) and passing uncondensed vapours at outlet (6).
- a liquid-liquid phase separator (7) is disposed of at this outlet.
- the liquid-liquid phase separator (7) is preferably arranged to two liquid phases (one phase is oil-immiscible solvent rich in dissolved Benzoic- acid and its derivative and second phase of pyrolysis oil), so that a stripping of Benzoic-acid along oil-immiscible solvent with an temperature and pH action due to the solubility of Benzoic -acid in oil-immiscible solvent causes the Benzoic-acid to stripping from the condensation region, reducing the interference caused to the vapour flow in said condenser.
- a portion of oil-immiscible solvent rich in dissolved Benzoic-acid and its derivative is separated out from pyrolysis oil that may be the main value added product of pyrolysis.
- the second liquid-liquid phase separator (7’) is placed parallel thereon to provide good residence time for phase separation like one or more Hr standby for each separator with the help of flow diversion of outlet (5) collection at valve (22).
- oil-immiscible solvent rich in dissolved Benzoic-acid and its derivative enters from the outlet (9) to a precipitation bath (10), and forms a precipitate of Benzoic-acid and derivatives due to the presence of acid like hydrochloric acid/sulphuric acid (between pH 0.001 to 7) or temperature is reduced below solubility point of Benzoic-acid in said oil- immiscible solvent.
- the said suspension then passes through a solid-liquid separator to separate the crystals of Benzoic -acid and its derivative at outlet (12).
- the fdtrate Oil -immiscible solvent collected at outlet (13) can be recirculated to condenser (3) via a heat exchanger (15) using pump (14).
- a multi -condenser (16, 3 and 19) configured in sequential manner are provided with aim to separate different condensable component of pyrolysis reaction coming out of pyrolysis reactor (1) in gaseous form and said approximate condensable are provided below: a) at First condenser (16): Condensates waxes (particularly hydrocarbons comprising mixture of maximum between C25 and above) at outlet (17) and pass the uncondensed vapour through conduit (18), b) at Middle Main condenser (3): Condensates mixture of hydrocarbons comprising maximum between C10-C25 and Benzoic-acid and its derivatives leaving uncondensed vapour through outlet (6), c) at Third condenser: Condensates oils (particularly hydrocarbons comprising mixture of maximum between C5 and CIO) at outlet (21) and pass the uncondensed vapour through conduit (20).
- the condensation temperature for each of the condenser is set as follows:
- the present invention provides a system and method, having a Benzoic-acid-separation step at middle condenser (3), wherein benzoic acid is inline separated from thermally decomposed gaseous matters by contacting the oil immiscible solvent at temperature about 80 to 95 °C and thereby absorbing the vapour of Benzoic-acid in said solvent and diverting optionally to agitator (not shown in figure), followed by in decanters/phase separator(7, T).
- agitator not shown in figure
- Each Decanter will separate the oil (hydrocarbons) and Benzoic -acid solution.
- Benzoic- acid is precipitated out by chilling the solution using heat exchanger (15) and filtering the pure precipitate to get crystals of Benzoic-acid in separator (7). Filtrate, thus can be recirculate back to middle condenser for reusing using pump (14) and heat exchanger (15).
- the inventor of the present invention developed an improved sequential condensation system for clog free pyrolysis of PET containing mixed plastic waste.
- the type and number of condensers employed in accordance with this invention can vary over a single condenser if it is direct contact condenser like Spray/jet condenser and two condensers if it is indirect contact condenser (Shell and tube condenser), depending on the efficiency of the particular condenser employed and the particular feedstock used.
- an in-line separation of Benzoic -acid is adapted using a middle condenser to restrict the deposition of sticky mass in the internal wall of vapour stream.
- a direct contact of oil-immiscible solvent in condenser is bringing the communication with vapour stream coming from first condenser or directly from pyrolysis reactor and taking away the traces of Benzoic -acid and some of the condensable hydrocarbons to separating step followed by precipitation of pure Benzoic -acid and collecting clear oil -immiscible solvent at the end.
- the oil immiscible solvent collected as filtrate can thus be recirculated back into a middle condenser and reused.
- the uncondensed vapor leaving the middle condenser further condensed at lower temperature in third condenser (19) to form condensate of oils and leaving non-condensable gases to vent (20) or for recirculation within the system.
- plurality of conduits to circulate hot gases, liquid attached with two way and three way valves, heat exchangers and recirculation conduits for temperature control which forms a part hereof and which are shown by way of illustration of embodiments and not limited to the description set forth.
- the improved clog free pyrolysis employs PET mixed feedstock including mixture of but not limited to polyethylene (PE), polypropylene (PP), polystyrene (PS), polyurethane (PU), and polyvinyl chloride (PVC) etc. which are thermally degraded to form value added products such as one or more waxes, hydrocarbon oil, pure Benzoic-acid and gases.
- PET mixed feedstock including mixture of but not limited to polyethylene (PE), polypropylene (PP), polystyrene (PS), polyurethane (PU), and polyvinyl chloride (PVC) etc. which are thermally degraded to form value added products such as one or more waxes, hydrocarbon oil, pure Benzoic-acid and gases.
- a middle condenser best described as a direct condenser is provided to dissolve a Benzoic-acid and some of the hydrocarbons in oil immiscible solvent used in the direct condenser, and is effectively and selectively separating away the Benzoic-acid from remaining vapor to allow in-line separation step for Benzoic-acid and preventing deposition of the same and thereby preventing clogging of the pyrolysis system.
- Example 1 Effect on pressure developed on condenser with and without process developed as per present invention and recovery of Benzoic-acid and its derivatives:
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Combustion & Propulsion (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Sustainable Development (AREA)
- Polymers & Plastics (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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CA3141090A CA3141090A1 (en) | 2019-06-12 | 2020-06-12 | An improved clog-free condensation system for pyrolysis vapour of pet containing polymer |
GB2118987.3A GB2599826A (en) | 2019-06-12 | 2020-06-12 | An improved clog-free condensation system for pyrolysis vapour of pet containing polymer |
US17/618,460 US20220297026A1 (en) | 2019-06-12 | 2020-06-12 | Clog free condensation system for pyrolysis vapor of pet containing polymer |
EP20823569.7A EP3983503A4 (en) | 2019-06-12 | 2020-06-12 | An improved clog-free condensation system for pyrolysis vapour of pet containing polymer |
AU2020291828A AU2020291828A1 (en) | 2019-06-12 | 2020-06-12 | An improved clog-free condensation system for pyrolysis vapour of PET containing polymer |
ZA2022/00408A ZA202200408B (en) | 2019-06-12 | 2022-01-07 | An improved clog-free condensation system for pyrolysis vapour of pet containing polymer |
Applications Claiming Priority (2)
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IN201921023312 | 2019-06-12 | ||
IN201921023312 | 2019-06-12 |
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WO2020250248A1 true WO2020250248A1 (en) | 2020-12-17 |
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PCT/IN2020/050523 WO2020250248A1 (en) | 2019-06-12 | 2020-06-12 | An improved clog-free condensation system for pyrolysis vapour of pet containing polymer |
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Country | Link |
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US (1) | US20220297026A1 (en) |
EP (1) | EP3983503A4 (en) |
AU (1) | AU2020291828A1 (en) |
CA (1) | CA3141090A1 (en) |
GB (1) | GB2599826A (en) |
WO (1) | WO2020250248A1 (en) |
ZA (1) | ZA202200408B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023285472A3 (en) * | 2021-07-13 | 2023-02-16 | Indaver Plastics2Chemicals | "method for producing purified fractions of a liquid crude pyrolysis oil from a hydrocarbon based waste plastic" |
Citations (2)
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US20030196883A1 (en) * | 2000-02-29 | 2003-10-23 | Tokyo Ertec Co., Ltd. | Method and system for pyrolyzing plastic and pyrolysate product |
WO2018085934A1 (en) * | 2016-11-09 | 2018-05-17 | Handa, Janak H. | System and process for converting plastic waste to oil products |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2538611C2 (en) * | 1975-08-29 | 1983-09-08 | Linde Ag, 6200 Wiesbaden | Process for cooling a raw gas mixture containing different boiling hydrocarbons |
US4252543A (en) * | 1979-07-25 | 1981-02-24 | General Electric Company | Process for quenching and cleaning a fuel gas mixture |
US8193403B2 (en) * | 2006-08-24 | 2012-06-05 | Agilyx Corporation | Systems and methods for recycling plastic |
-
2020
- 2020-06-12 US US17/618,460 patent/US20220297026A1/en active Pending
- 2020-06-12 AU AU2020291828A patent/AU2020291828A1/en not_active Abandoned
- 2020-06-12 EP EP20823569.7A patent/EP3983503A4/en active Pending
- 2020-06-12 GB GB2118987.3A patent/GB2599826A/en not_active Withdrawn
- 2020-06-12 CA CA3141090A patent/CA3141090A1/en active Pending
- 2020-06-12 WO PCT/IN2020/050523 patent/WO2020250248A1/en unknown
-
2022
- 2022-01-07 ZA ZA2022/00408A patent/ZA202200408B/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030196883A1 (en) * | 2000-02-29 | 2003-10-23 | Tokyo Ertec Co., Ltd. | Method and system for pyrolyzing plastic and pyrolysate product |
WO2018085934A1 (en) * | 2016-11-09 | 2018-05-17 | Handa, Janak H. | System and process for converting plastic waste to oil products |
Non-Patent Citations (1)
Title |
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See also references of EP3983503A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023285472A3 (en) * | 2021-07-13 | 2023-02-16 | Indaver Plastics2Chemicals | "method for producing purified fractions of a liquid crude pyrolysis oil from a hydrocarbon based waste plastic" |
Also Published As
Publication number | Publication date |
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GB2599826A (en) | 2022-04-13 |
AU2020291828A1 (en) | 2022-02-03 |
ZA202200408B (en) | 2022-09-28 |
EP3983503A1 (en) | 2022-04-20 |
US20220297026A1 (en) | 2022-09-22 |
EP3983503A4 (en) | 2023-02-15 |
GB202118987D0 (en) | 2022-02-09 |
CA3141090A1 (en) | 2020-12-17 |
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