Pyrolysis of some whole plastics and plastics–coal mixtures

Ishaq, Mohammad; Ahmad, Imtiaz; Shakirullah, Mohammad; Khan, Mudassar Nawaz; Rehman, Habib ur; Bahader, Ali

doi:10.1016/j.enconman.2006.02.019

Cited by 36 publications

(19 citation statements)

References 22 publications

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“…Synergetic effect favored the formation of gas and tar products. As discussed above, the higher H/C and O/C molar ratios and AAEMs contents in biomass can increase the volatile yields from coal (Ishaq et al, 2006;Sharypov et al, 2007;Straka et al, 2004).…”

Section: Product Yieldsmentioning

confidence: 87%

Co-pyrolysis of pine sawdust and lignite in a thermogravimetric analyzer and a fixed-bed reactor

Song

Tahmasebi

2014

Bioresource Technology

127

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Section: Product Yieldsmentioning

confidence: 87%

Co-pyrolysis of pine sawdust and lignite in a thermogravimetric analyzer and a fixed-bed reactor

Song

Tahmasebi

2014

Bioresource Technology

127

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“…This problem seems to arise due to low surface area per volume of the plastic particles as explained in Section 3.1. At high temperature, free radicals are more mobile and cleavage of C-C bonds intensifies, which subsequently produce more free radicals 49) .…”

Section: Resultsmentioning

confidence: 99%

Yield and Composition of Bio-oil from Co-Pyrolysis of Corn Cobs and Plastic Waste of HDPE in a Fixed Bed Reactor

Supramono

Kusrini

Yuana

2016

J. Jpn. Inst. Energy

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Pyrolysis, a thermal cracking process in inert environment, may be used to produce bio-oil from biomass and plastic waste thus accommodating the use of renewable energy. Abundant amount of biomass wastes in Indonesia are not utilised and plastic wastes are not well processed for clean environment. The aim of present work was to evaluate effect of mass ratio of plastic material to biomass in the feed blend of corn cobs and high density polyethylene (HDPE) of co-pyrolysis on bio-oil yield and chemical composition of bio-oil products. The heating rate of the co-pyrolysis was kept low and residence time was in the order of seconds to accommodate high yield of oil originating from plastic pyrolysis. Corn cobs have high cellulose and hemicellulose content (84%) which is potential to produce bio-oil. The pyrolysis was conducted in a laboratory-scale using a fixed bed reactor with final temperature of 500 °C, heating rate 5 °C/min, flow rate N2 750 mL/min, total weight of biomass and plastic material of 20 g, and hold time after peak temperature of 30 min. Mass ratio of plastics to biomass in the feed blend was varied 0:100, 25:75, 50:50, 75:25 and 100:0. It was found that by increasing HDPE content up to 100% in the feed blend above, the yields of bio-oil decreased, i.e. 28.05, 21.55, 14.55, 9.5, and 6.3 wt%, respectively. Furthermore, for the same variation of the mass ratio, yields of the non-oxygenate mixture of paraffins, olefins and cycloalkanes contained in bio-oil increased, i.e. 0, 28.35, 40.75, 47.17, and 67.05 wt%, respectively. Analysis of the synergetic effect indicates that this effect did work effectively both in bio-oil and non-oxygenate yields due to improper conductive heat transfer from N 2 gas to melting plastics, which contained biomass particles. By increasing composition of HDPE in the feed blend, viscosity and pH of bio-oil changed approaching to those of commercial diesel oil.

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“…In the temperature range from 400 to 500 °C a certain interaction between polymers and coal can occur. In the given temperature range coal is in a plastic state and the structure of polymers is cleaved to radicals of low hydrocarbons [3]. The mechanism of co-pyrolysis is described as the cleaving of coal structure: R-R  2R and the interaction with polymers: polymer-H + R  polymer + R-H [4].…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of co-pyrolysis is described as the cleaving of coal structure: R-R  2R and the interaction with polymers: polymer-H + R  polymer + R-H [4]. The formation and stabilisation of free radicals by hydrogen transport depends on the material and temperature used [3].…”

Section: Introductionmentioning

confidence: 99%

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Study of Pyrolysisis of Polymers and Coal and Co-Pyrolysis of Their Blends, Kinetics of the Process

Mikulová¹,

Večeř²,

Frantík³

2012

TransVSBms

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Amount of polymer waste increase every year and for this reason upgrading of this waste is a necessity. Nowadays waste disposal and incineration of polymers waste are the most frequently used methods which (i) did not allowed chemical and energy utilization and (ii) are not environmentally friendly. Pyrolysis and co-pyrolysis provide an attractive way to dispose of and convert polymer waste and coal into higher value fuel and the specific benefits of this method potentially include many environmental friendly advantages. Pyrolysis and co-pyrolysis has been studied using termogravimetry apparatus NETZCH TG-DTA STA 409 EP. The pyrolysis of all polymers except for scrap tyres was a one-step process and temperature range was narrower than for coal pyrolysis. The overlapping temperature range for pyrolysis of polymers and coal was 200-600°C. The synergic effect and kinetics of co-pyrolysis of polymers and coal has been studied in the given temperature range. The addition of polymers to coal led to (i) the enhancement of weight loss of brown coal, (ii) the shift of temperature of the max pyrolysis speed and (iii) the slight influence of E A of coal pyrolysis. AbstraktMnožství odpadních polymerů každoročně stoupá a jejich recyklace je velmi důležitá. V dnešní době je největší část těchto odpadů ukládána na skládky nebo spalována. Tyto dvě metody však nejsou příliš vhodné (nedochází k chemickému ani energetickému využití materiálu) a nejsou ani šetrné k životnímu prostředí. Pyrolýza a ko-pyrolýza jsou vhodné recyklační metody umožňující přeměnu odpadních polymerů a uhlí na paliva s vyšším energetickým obsahem a jsou šetrné k životnímu prostředí. Pyrolýza a ko-pyrolýza vybraných polymerních materiálů s hnědým uhlím byla studována pomocí dynamické termogravimetrie na přístroji LECO TG-DTA STA 409 EP firmy NETZCH. Pyrolýza polymerů, kromě odpadních pneumatik, probíhala v jednom stupni a v užším teplotním intervalu než pyrolýza uhlí. Teplotní interval, kdy docházelo k pyrolýze polymeru i uhlí byl 200-600°C. V tomto teplotním intervalu byla rovněž studována kinetika ko-pyrolýzy a synergický efekt studovaných polymerů a hnědého uhlí. Nejvyšší pozitivní synergický efekt vedoucí ke zvýšení hmotnostního úbytku hnědého uhlí a rychlejší pyrolýzy při nižších teplotách měl ze studovaných polymerů polypropylen.

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Pyrolysis of some whole plastics and plastics–coal mixtures

Cited by 36 publications

References 22 publications

Co-pyrolysis of pine sawdust and lignite in a thermogravimetric analyzer and a fixed-bed reactor

Co-pyrolysis of pine sawdust and lignite in a thermogravimetric analyzer and a fixed-bed reactor

Yield and Composition of Bio-oil from Co-Pyrolysis of Corn Cobs and Plastic Waste of HDPE in a Fixed Bed Reactor

Study of Pyrolysisis of Polymers and Coal and Co-Pyrolysis of Their Blends, Kinetics of the Process

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