Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
  • C10J3/72—Other features
  • C10J3/82—Gas withdrawal means
  • C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
  • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
  • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
  • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
  • C01B3/36—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using oxygen or mixtures containing oxygen as gasifying agents
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
  • C10J2300/0913—Carbonaceous raw material
  • C10J2300/0946—Waste, e.g. MSW, tires, glass, tar sand, peat, paper, lignite, oil shale
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
  • C10J2300/0953—Gasifying agents
  • C10J2300/0959—Oxygen
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
  • C10J2300/0953—Gasifying agents
  • C10J2300/0973—Water
  • C10J2300/0976—Water as steam
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
  • C10J2300/169—Integration of gasification processes with another plant or parts within the plant with water treatments
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
  • C10J2300/1846—Partial oxidation, i.e. injection of air or oxygen only
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
  • C10J2300/1861—Heat exchange between at least two process streams
  • C10J2300/1884—Heat exchange between at least two process streams with one stream being synthesis gas
• • 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
  • Y02P20/10—Process efficiency
  • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
• • 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 direct disposal of plastic wast by means of a method for chemical recycling of plastic material using the material as feed stock for petrochemical processes More specificly the invention concerns recycling of plastic wast as feed stock into the reactor unit of a partial oxidatio process operating at high temperatures and pressures in th presence of oxygen and with steam as a moderating agent.
• Th partial oxidation process comprises gasification, waste hea recovery and carbon removal in a scrubber unit during formatio of soot water slurry containing the unburned carbon and ash.
• recycled plastic waste is proposed to be used as feedstock fo hydrocarbon gasification processes making synthesis gas hydrogen and carbon monoxide. After purification of such a ra gas, which will be heavily loaded with impurities, it may be use as a raw material and feed for the production of basic chemical such as ammonia and ethanol.
• the temperature of the flui feedstock is between 50-150°C and the viscosity at least 300°cSt preferably 500°cSt and the pressure in the reactor is 15-35 bar
• the viscosity of the oil/plastic mixture depends on the amoun and type of plastics and the initial viscosity of the base oil Accordingly, for avoiding that the viscosity of the mixture get too high, any increase in plastic waste concentration must b balanced by a less viscous - more expensive base oil. Viscosit below 250-300°cSt is usually desired.
• the main object of the present invention was to provide a metho for chemical recycling of plastic waste where the above drawback are eliminated.
• Partial oxidation processes for hydrocarbon feedstocks were developed and commercialized during the 1950's.
• the best know processes such as the Shell gasification process and the Texac gasification process, have been utilized in a number of commer cial plants.
• the unburned carbon from the gasifier will be made int a carbon slurry, an aqueous suspension containing soot and significant amount of ash, depending on the feedstock, which ha to be further processed and recycled.
• the soot/ash slurry from the carbon separation step will at leas contain 0.5-3% unburned carbon and 0.1-2% ash.
• the ash may contain appreciable amounts of Ni, Fe and V as well as Cl pigments and other inorganic substances used in the productio of plastic materials.
• Such recirculation is avoided with an improved filtration step the soot/water slurry from the carbon/ash removal step i initially passing through a sedimentation step after flocculatin agents have been added to the solution.
• Filtration is carried ou at low temperatures below 80-75°C and preferably between 20-60" while confining the soot water slurry containing impurities fro the plastic material combustion between movable filter belt exerting a constant line pressure until the filtercake contains less than 80% water and is no longer soapy or pasty but i tranferred into flakes or agglomerates which are easily separate and well suited for subsequent transport and processing.
• Oil and plastic material are directl fed to the gasification reactor without any chemical or therma pretreatment breaking down the molecular chains.
• the oil feedstock may comprice various types of waste residue and oil, like highly aromatic oils, PCB and other waste product from petrochemical industries which to day are disposed of b high temperature incineration.
• Fig. 1 shows a general flow sheet of the gasification process comprising application of oil/plastic feedstock.
• Plastic waste material 15 and oil 12 are directly fed into th reactor 13 of the gasification unit. Gasification and partia oxidation is carried out at 40-60 bar and at a temperature o 1300-1500°C in the presence of oxygen 16 using steam 17 as moderating agent. After passing through a waste heat recover unit 14 the gases are passed through a carbon removal step 1 i which unburned carbon and ash are removed in a water wash. The resulting soot/ash water slurry emerging from the carbon/as separation stage 1 is initially passed through a cooler 2 t lower the temperature from approximately 95°C to 20-60°C.
• the slurry is then passed to a soot slurry tank 3 and thereafte through a mixer 4 to administer flocculation agents from a sourc 5.
• Two flocculants are used, one positively charged polyelectro lyte sold under the trade mark Praestol 611BC (cationic) and on negatively charged polyelectrolyte sold under the trade mar Praestol 2440 (anionic) , both being in the form of whit polyacrylamide granulates.
• the ratio between the two types o flocculants can be varied within wide limits, but shoul preferably be in the range of 1-5 : 0.5-2 cationic : anioni flocculant.
• the total amount of flocculants added was adjusted to betwee 60-100 ppm and the ratio of cationic : anion polyelectrolyte wa 1.5 : 1.
• the flocculants were added to the slurry in the form o a 0.1-0.3% solution in water.
• the resulting product 9 could be handled and further processe without any problems.
• the proportion of oil and recyclin plastics can be varied within wide limits and the upper limit of plastics can be 40-50% (by weight) or higher.
• the conten of impurities in the plastic waste is less critical than in know recycle processes. Even chlorine containing plastic materia (PVC) can be tolerated to a certain extent. Due to the hig temperatures, any type of organic chlorine compound will b desintegrated.
• the resulting hydrochloric acid is disposed o within the process according to the invention by neutralization.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Inorganic Chemistry (AREA)
• Processing Of Solid Wastes (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Applications Claiming Priority (2)

Publications (1)

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Citations (2)

• 1992
  • 1992-11-11 NO NO924337A patent/NO176669C/no unknown
• 1993
  • 1993-11-09 CA CA002149145A patent/CA2149145C/en not_active Expired - Lifetime
  • 1993-11-09 WO PCT/NO1993/000164 patent/WO1994011465A1/en active Application Filing
  • 1993-11-11 CN CN93121334A patent/CN1092097A/zh active Pending

Patent Citations (2)

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