Coliquefaction of Waste Plastics with Coal

Taghiei, M. Mehdi; Feng, Zhen; Huggins, Frank E.; Huffman, G.P.

doi:10.1021/ef00048a010

Cited by 107 publications

(81 citation statements)

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“…However, the existence of non-catalytic synergistic effect remains controversial. Some researchers [43,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][101][102][103][104][105][106][107][108] have shown evidence of synergy between biomass and coal while others [44][45][46][47][48][49][50][51][52][53][54][55][56] found no evidence of synergy. Trevor and Kandiyoti [109] pointed out that the way biomass components are intermeshed affects the distribution of pyrolysis products.…”

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

“…Another investigation by Mastral et al [105] revealed that the slight synergy found can be due to the small free radicals from vulcanized rubber decomposition, which are able to stabilize coal radicals to light products. Taghiei et al [106] also conducted co-liquefaction of PE and mixed plastic waste with a bituminous coal, a subbituminous coal and lignite in a tubing bomb reactor. Co-liquefaction of mixed waste plastics with a bituminous coal exhibited higher oil yields than obtained by liquefaction of either the waste plastics or the coal alone implying synergistic effects.…”

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

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A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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Abstract:Biomass is relatively cleaner than coal and is the only renewable carbon resource that can be directly converted into fuel. Biomass can significantly contribute to the world's energy needs if harnessed sustainably. However, there are also problems associated with the thermal conversion of biomass. This paper investigates and discusses issues associated with the thermal conversion of coal and biomass as a blend. Most notable topics reviewed are slagging and fouling caused by the relatively reactive alkali and alkaline earth compounds (K 2 O, Na 2 O and CaO) found in biomass ash. The alkali and alkaline earth metals (AAEM) present and dispersed in biomass fuels induce catalytic activity during co-conversion with coal. The catalytic activity is most noticeable when blended with high rank coals. The synergy during co-conversion is still controversial although it has been theorized that biomass acts like a hydrogen donor in liquefaction. Published literature also shows that coal and biomass exhibit different mechanisms, depending on the operating conditions, for the formation of nitrogen (N) and sulfur species. Utilization aspects of fly ash from blending coal and biomass are discussed. Recommendations are made on pretreatment options to increase the energy density of biomass fuels through pelletization, torrefaction and flash pyrolysis to reduce transportation costs.

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Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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“…In addition to energy considerations, the development of improved methods for converting these low-cost waste polymers in an environmentally favorable way appears to be the best alternative route to plastics pyrolysis or recycling. With respect to present trends in finding cost-effective energy sources, recent research efforts have focused on the utilization of waste polymeric materials in reacting directly with coal [12,13]. This becomes possible since it is well established that waste plastics undergo depolymerization and degradation above 380˚C by a free radical chain reaction [14].…”

Section: Introductionmentioning

confidence: 99%

Environmentally Harmful Low Density Waste Plastic Conversion into Kerosene Grade Fuel

Sarker¹,

Mamunor²,

Sadikur³

et al. 2012

JEP

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Plastics wastes from a municipal solid waste (MSW) plant have a high-energy content and are suitable for fuel generation. Thermal cracking is one of the possible ways to obtain petrochemical feedstock from polymer wastes. Municipal waste plastic of LDPE conversion to kerosene grade fuel experiments were carried out under atmospheric conditions at temperatures between 150˚C and 420˚C. Low density polyethylene (LDPE) plastic waste (Code #2) was thermally depolymerized in batch process into stainless steel reactor without adding catalyst. The maximum kerosene grade fuel yield is 30%, other grade fuel 60%, light gas 6% and left over residue 4%. The composition, sulphur and Btu value of liquid products were determined by ASTM method. Produced fuel was analyzed by gas chromatography and mass spectrometer and FT-IR. Very high conversions from LDPE waste plastic to kerosene grade fuel (up to 35%) were obtained while using this technique. Detailed product analyses and characterization lead to a reasonable explanation of reaction pathways and mechanisms.

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“…One option for coprocessing is to react polymeric waste with coal under direct liquefaction conditions. [5][6][7] Coprocessing of polymeric waste with coal provides for simultaneous conversion of both feedstocks into high-valued fuels and chemicals.…”

Section: Introductionmentioning

confidence: 99%

Coal/Polymer Coprocessing With Efficient Use of Hydrogen

Broadbelt¹,

Witt²

1998

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Coliquefaction of Waste Plastics with Coal

Cited by 107 publications

References 1 publication

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

Environmentally Harmful Low Density Waste Plastic Conversion into Kerosene Grade Fuel

Coal/Polymer Coprocessing With Efficient Use of Hydrogen

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