CONVERSION OF PLASTIC INTO OIL

• Main Authors: OYOSHI HAJIME, KISO YOSHIHISA, SHIMAMOTO KENJI
• Format: Patent
• Language: English
• Published: 25.11.1997
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS BASED THEREON; CRACKING HYDROCARBON OILS; FUELS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LUBRICANTS; METALLURGY; MINERAL WAXES; ORGANIC MACROMOLECULAR COMPOUNDS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; 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; THEIR RELEVANT APPARATUS; TRANSPORTING; WORKING-UP

PROBLEM TO BE SOLVED: To efficiently convert plastics, esp. mixed plastics containing polyolefin(s) and polystyrene, into oil. SOLUTION: Plastics are catalytically pyrolyzed to obtain an oily product in the presence of a synthetic silica-alumina catalyst having the following characteristics: degree of crystallinity calculated by the formula described below based on the diffraction line spectrum intensity determined by powder X-ray diffractometry is <=5%; weight ratio: silica/alumina (SiO2 /Al2 O3 ) is (90:10) to (65:35); and, acid value is <=0.4mgKOH/g. the formula is: degree of crystallinity = [S1 /[S1 +S2 )] × 100(%) [S1 is the area of such spectrum that the range of diffraction angle 2θ falls between 22 and 42; S2 is the area of such spectrum that the range of diffraction angle 2θ falls between 20 and 70].