Preparation of liquid chemical feedstocks by co-pyrolysis of electronic waste and biomass without formation of polybrominated dibenzo-p-dioxins

Liu, Wujun; Tian, Ke; Jiang, Hong; Zhang, Xuesong; Yang, Guang-Xi

doi:10.1016/j.biortech.2012.10.160

Cited by 71 publications

(25 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For inert conditions, there was a main degradation step from 573 to 650 K, which can be attributed to the decomposition of BFR and the polymer with low polymerization degree. Beyond 650 K, the degradation still continues but the rate decreases, due to the decomposition of the polymer with high polymerization degree, around 30 wt.% of char product remaining at 1273 K. These results are in concordance with those obtained by Liu et al [26] for the thermal degradation of electronic waste in inert atmosphere. Nickel addition in inert atmosphere degradation can be said to have no significant effect.…”

Section: Vessel Experiments In the Presence Of Lnk-carbonate Mixturesupporting

confidence: 94%

“…However, many studies have shown that pyrolysis oil contains mainly aromatic compounds like benzofurans, phenols and phosphate compounds from the decomposition of flame retardants such as tetrabromobisphenol A and triphenyl phosphate [22][23][24][25]. Therefore, additional steps must be added to the process to upgrade the pyrolysis oil [26]. Some authors studied a two-step degradation process for printed circuit board wastes based on pyrolysis (573-723 K) and catalytic hydrotreatment (743 K) [27].…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Steam gasification of printed circuit board from e-waste: Effect of coexisting nickel to hydrogen production

Salbidegoitia

Fuentes-Ordóñez

González-Marcos

et al. 2015

Fuel Processing Technology

View full text Add to dashboard Cite

Section: Vessel Experiments In the Presence Of Lnk-carbonate Mixturesupporting

confidence: 94%

Section: Introductionmentioning

confidence: 98%

Steam gasification of printed circuit board from e-waste: Effect of coexisting nickel to hydrogen production

Salbidegoitia

Fuentes-Ordóñez

González-Marcos

et al. 2015

Fuel Processing Technology

View full text Add to dashboard Cite

“…The pyrolysis of waste PCB appears to be one of the most promising technologies, leading to the production of valuable gas, liquid, and solid products from waste PCB (Barontini et al, 2005;Grause et al, 2008;Guan et al, 2008;Guo et al, 2010;Quan et al, 2010;Liu et al, 2013). In addition, the initial state of the metals used for manufacturing PCBs can be recovered by the pyrolysis process and can be reused as the raw materials for PCBs after minimal pre-treatment processes.…”

Section: Introductionmentioning

confidence: 96%

Pyrolysis Reaction Pathways of Waste Epoxy-Printed Circuit Board

Kim

Lee

et al. 2013

Environmental Engineering Science

View full text Add to dashboard Cite

This article elucidates pyrolysis reaction pathways of waste epoxy-printed circuit boards (e-PCBs). Non-isothermal thermogravimetric analyses showed that waste e-PCBs decomposed via a series of reactions distinguished by three apparent reaction regions. The first-stage reaction ( <250°C) can be accounted for by the cleavage reaction of N-containing cross-linkage between brominated epoxy resin (BER) and non-brominated epoxy resin (NBER). Evolved gas analysis-mass spectrometry (EGA-MS) showed that the second-stage reaction (250-500°C) can be represented by two independent decomposition reactions of BERs and NBERs to yield thermally stable intermediates. BERs decomposed more rapidly (250-350°C), whereas NBERs decomposed over broader temperature regions (250-500°C) with slower decomposition rates. Multi-shot gas chromatography/mass spectrometry also indicated that brominated compounds, brominated phenol and brominated bisphenol A, are generated mainly at lower temperature zones of the second-stage region, whereas phenols and branched phenols are generated at higher temperature zones. Steady but slow conversion of intermediates was carried out over the conversion of 0.9. At the third-stage reaction, thermally stable intermediates were converted slowly to char as a result of HBr release from intermediates.

show abstract

“…It is found that the oil yield from the pyrolysis of sawdust alone was 46.5% (i.e. run #10), which is consistent with the reported yield rates of sawdust pyrolysis in many literatures (Fei et al, 2012;Liu et al, 2013). Less liquid oil yield (i.e., 35.3%) was obtained from the pyrolysis of oily sludge alone (i.e.…”

Section: Pyrolysis Proceduressupporting

confidence: 78%

“…for 8 h to remove moisture, respectively (Liu et al, 2013;Tian et al, 2014). The sawdust was ground in a high-speed rotary cutting mill and then screened into particles of about 1 mm in diameter.…”

Section: Experiments 621 Materialsmentioning

confidence: 99%

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

Hu¹

View full text Add to dashboard Cite

Oily sludge is one of the most significant wastes generated in the petroleum industry.It is a complex emulsion of various petroleum hydrocarbons (PHCs), water, metals, and fine solids. Due to its hazardous nature and increased generation quantities around the world, the effective treatment of oily sludge has attracted widespread attention. The complexity of its composition and diversity of its origin sources make oily sludge management a difficult and costly undertaking. Many methods have been developed for the treatment of oily sludge through oil recovery or sludge disposal approaches, but no single specific process can be considered as a panacea since each method is associated with different advantages and limitations. Efforts should focus on the improvement of current technologies and the combination of oil recovery with sludge disposal in order to comply with both resource reuse recommendations and environmental regulations. The object of this study was to develop novel combined methods for oil recovery treatment on different refinery oily sludges. The investigation focused on the oil recovery performance of combined methods based on four individual treatment processes including ultrasonic irradiation, solvent extraction, freeze/thaw, and pyrolysis in oily sludge treatment.Firstly, the oil recovery and salt removal effects of ultrasonic irradiation on oil refinery tank bottom sludge were investigated, together with those of direct heating.Ultrasonic power, treatment duration, sludge-to-water ratio, and initial sludge-water slurry temperature were examined for their impacts on sludge treatment. It was found that the increased initial slurry temperature could enhance the ultrasonic irradiation performance, especially at lower ultrasonic power level (i.e., 21 W), but the application of higher-power ultrasonic irradiation could rapidly increase the bulk temperature of slurry. Ultrasonic 2 irradiation had a better oil recovery and salt removal performance than direct heating treatment. More than 60% of PH Cs in the sludge was recovered at an ultrasonic power of 75 W, a treatment duration of 6 min, an initial slurry temperature of 25 °C, and a sludgeto-water ratio of 1 :4, while salt content in the recovered oil was reduced to <5 mg/L, thereby satisfying the salt requirement in refinery feedstock oil. In general, ultrasonic irradiation could be an effective method in terms of oil recovery and salt removal from refinery oily sludge, but the separated wastewater still contains relatively high concentrations of PH Cs and salt which requires proper treatment.Two types of ultrasonic assisted extraction (UAE) treatment including UAE probe (UAEP) system and UAE bath (UAEB) system were investigated for oil recovery from refinery oily sludge. Their oil recovery efficiencies were compared to that of mechanical shaking extraction (MSE). Three solvents including cyclohexane (CHX), ethyl acetate (EA), and methyl ethyl ketone (MEK) were examined as the extraction solvents. The influence of experimental factors on oil an...

show abstract

Preparation of liquid chemical feedstocks by co-pyrolysis of electronic waste and biomass without formation of polybrominated dibenzo-p-dioxins

Cited by 71 publications

References 33 publications

Steam gasification of printed circuit board from e-waste: Effect of coexisting nickel to hydrogen production

Steam gasification of printed circuit board from e-waste: Effect of coexisting nickel to hydrogen production

Pyrolysis Reaction Pathways of Waste Epoxy-Printed Circuit Board

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

Contact Info

Product

Resources

About