METHOD FOR CONVERTING PLASTIC INTO OIL

• Main Authors: OYOSHI HAJIME, KISO YOSHIHISA, SHIMAMOTO KENJI
• Format: Patent
• Language: English
• Published: 30.09.1997
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS BASED THEREON; CRACKING HYDROCARBON OILS; DESTRUCTIVE DISTILLATION OF CARBONAGEOUS MATERIALS FORPRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS; FUELS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LUBRICANTS; MAKING GRANULES OR PREFORMS; METALLURGY; MINERAL WAXES; ORGANIC MACROMOLECULAR COMPOUNDS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; TECHNICAL GASES CONTAINING CARBON MONOXIDE; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To make it possible to improve the productivity, to realize an oil conversion method wherein the product is liquid at room temperature, to reduce the corrosion of the apparatus by the formed hydrogen halide and to make the method suitable for industry by heat-decomposing a plastic into an oil in the presence of allophane. SOLUTION: Naturally occurring irregularly shaped or hollow-shaped amorphous or cryptocrystalline allophane which is a hydrated silicate mineral of aluminum and represented by the compositional formula: pSiO2 .qAl2 O3 .rH2 O (wherein p:q=(1-2):1) and having a water content as low as 0-20wt.%, desirably 5-13wt.% is used. Because usually available allophane has a water content higher than that, it is dehydrated to a desired water content by heating for 1-50hr at 70-200 deg.C. The plastic being the material to be treated may be a thermoplastic or thermosetting one, desirable e.g. a polymer or copolymer based on a polyolefin. The decomposition temperature is 250-500 deg.C, the reaction time is 0.1min to 5hr, and the amount of the allophane used is 0.1-5wt.% based on the plastic.