Catalytic decomposition of polyolefins. III. Decomposition over the ZSM‐5 catalyst

Abstract

306 VASILE, ONU et al. : Catalytic decomposition of polyolefins. I11 FlieBverhalten der untersuchten PVC-Mischungen von der PE-Komponente bestimmt wird, die wahrscheinlich die SAN-Copolymerteilchen blockiert. Die Destruktionsvorgange bei PVC-Mischungen werden bekanntlich von einer partiellen Vernetzung begleitet, die in einer extremen Erhohung des Drehmoments bei der Untersuchung m i t einem Plasticorder Brabender z u m Ausdruck kommt. Aus d e n Werten fur die Destruktionsgeschwindiglceit (Tabelle 2) i s t ersichtlich, daB diese bei Steigerung der PE-Konzentration abnimmt, wobei die Abnahme zwischen 8 u n d 11% PE sprungartig erfolgt. Diese Ergebnisse lassen sich durch d e n niedrigeren PVC-Gehalt und die d a m i t verbundene geringere Wahrscheinlichkeit der Entstehung zwischenmolekularer Bindungen i n dem System erklaren. Auffallend ist (Versuche 4, 5, 3, 6), daB bei gleicher PE-Konzentration die SAN-Copolymer enthaltenden Mischungen eine hohere Destruktionsgeschwindigkeit aufweisen. Diese Ergebnisse lassen sich durch das Vorliegen stark verzweigter PE-SAN-Makromolekule i m System PVC/PE/SAN-Pfropfcopolymer er-

Preparation and Characterization of Dealuminated Metakaolin and Its Use in the Transformation of Waste Plastics to Aromatic Hydrocarbons

“…Catalytic transformation increases the rate of polymer decomposition (9) forming shorter chain (liquid) hydrocarbons (5,10) including high octane hydrocarbons such as iso-alkanes and aromatics (11). Currently, two distinct methods are used to study the effect of transformation agents on the product distribution from pyrolysis: (1) physical mixing of the polymer and catalyst (6,8,10,(12)(13)(14)(15)(16); and (2) the exposure of post pyrolysis gas streams to catalyst beds which are physically distant from the site of pyrolysis (3,5,7,9,11,(19)(20)(21).…”

Sunlight‐Mediated Degradation of Polyethylene under the Synergy of Photothermal CH Activation and Modification

“…Some comparative experiments were performed to verify further the role of DIAD and TBADT in the photothermal reaction (Table 1, entries [12][13][14]. When the feed ratio of [E]/[DIDA] was 1/2 without the addition of photocatalyst (entry 12), a small amount of DIAD would be grafted onto the polymer with no significant change in molecular weight, which might be the reason that DIAD could generate free radicals at 110 °C for modification of the polymer.…”

“…202100322 Heterogeneous catalysts such as amorphous silica-alumina, zeolites, and carbons could also be used for the pyrolysis of PE plastics at high temperatures. [12][13][14][15] Recently, Huang et al reported the degradation of PE plastics at 150 °C for 3 days using a tandem catalytic cross alkane metathesis process to obtain oil and wax products. [16] These degradation processes usually required high temperature, and the dagradation suffered from low energy efficiency.…”

Preparation and characteristics of cross‐linkable polysulfone having methylene methacrylate side‐chain

“…The UV-curable systems is notably demonstrated by the numerous studies published in this field over the past 15 years. [6][7][8][9][10][11][12][13][14] The main reasons for this interest are the considerable advantages offered by the UVcuring process of polymerization over more conventional processes such as thermal curing, including very high speeds of curing that lead to high productivity, lower energy consumption, reduction of volatile organic compounds emissions, and so forth. 6 Methacrylates of side chain are crosslinkable when exposed at UV radiation.…”