Thermal behavior and gas products of cold rolling oily sludge by TG-MS and Py-EGA/MS

Fu, Yali; Que, Zhigang; Shi, Jinming; Ai, Xianbin; Wu, Zou

doi:10.1016/j.egyr.2022.02.012

Cited by 12 publications

(5 citation statements)

References 28 publications

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“…For the wax products, CO 2 was released primarily at 400°C, which is regarded as the COOH bond breaking. The oxygen‐containing carbonyl functional group began to fracture with the increase of temperature, showing a strong peak around 500°C 49,50 . It can be found that oxygenate species increased with increasing the adsorption decolorization temperature when the temperature is higher than 130°C, and all these results are in well agreement with 1 H NMR analysis of waxes.…”

Section: Resultssupporting

confidence: 78%

Adsorption decolorization and composition analysis of high melting point Fischer–Tropsch waxes

Jiang

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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The decolorization and quality improvement of the high melting point Fischer-Tropsch wax were carried out by the method of adsorption refining, and the activated clay was selected as adsorbent. The effects of adsorption decolorization temperature on the wax products were evaluated by testing the saybolt color number and whiteness value of the waxes. Meanwhile, the influence of adsorption decolorization temperature on the composition of waxes was investigated by gas chromatography (GC), inductively coupled plasma (ICP), thermogravimetry/differential thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), thermogravimetric mass spectrometry (TG-MS), Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and X-ray fluorescence (XRF) characterizations of waxes and adsorbents activated clay before and after use. The results showed that the best adsorption decolorization temperature is 120 C, and the corresponding saybolt color number of decolorization waxes is +16. The reasons for the poor chromaticity of high melting point wax are not only the inorganic components mainly composed of residual ultrafine catalyst particles but also the organic components of unsaturated carbon-carbon double bonds and heteroatomic compounds containing oxygen, nitrogen, and sulfur. The oxidative deterioration of the unsaturated carbon-carbon double bond and hydrocarbons with low bond energy in waxes, as well as the oxidation of hydrocarbons containing oxygen and nitrogen heteroatoms, may be the main reasons for the yellowing of the wax products in the process of decolorization.

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Section: Resultssupporting

confidence: 78%

Adsorption decolorization and composition analysis of high melting point Fischer–Tropsch waxes

Jiang

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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“…In contrast to conventional feedstocks, the triglycerides in this study were extracted from CRS and therefore contained many impurities, including iron compounds, surfactant, etc. As a waste from the cold rolling process, CRS contains large amounts of iron compounds, some of which exist in the form of fatty acid metal salts 31 (ferric oleate, stearic acid iron, etc.). The extracted oil was characterized by XRD after ashed.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, NaCl-modified GCN catalysts were prepared by co-thermal polymerization of urea and NaCl for the transesterification of oil recovered from cold rolling sludge (CRS), which is a mixture of waste liquid and slag produced in the cold rolling process. − The N atoms in GCN have lone-paired electrons and therefore act as Lewis base sites. The doping of NaCl generated CN and Na–N species which enhanced the basicity of the catalyst .…”

Section: Introductionmentioning

confidence: 99%

Investigation of NaCl-Modified Graphitic Carbon Nitride for Efficient Biodiesel Production from Waste Oil via Transesterification: A Box–Behnken Design Approach

Hu,

Jiang,

Song

et al. 2024

ACS Omega

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NaCl-modified graphitic carbon nitrides (GCN) were applied in the base-catalyzed transesterification of recovered oil. GCN has been seen as a prospective heterogeneous catalyst for transesterification, but pristine-GCN has a narrow range of applications because of its weak basic sites and small surface area. To overcome these defects, NaCl-modified GCN was prepared through the co-thermal polymerization of NaCl with urea. The doping of NaCl generated C�N and Na−N species, which enhanced the basicity of the catalyst. Meanwhile, with the assistance of NaCl, GCN was decomposed and produced a large number of small pores of hundreds of nanometers, which contributed to the increase in specific surface area. In addition, the effects of transesterification parameters and their interactions on biodiesel yields were investigated by using Box−Behnken design, and the reaction conditions were optimized. A high biodiesel yield of 93.05% was achieved under the optimal conditions.

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“…Thereafter, thermodynamic assessment thermodynamic parameters (Agnihotri et al 2022, Fu et al 2022 were for thermodynamic evaluation.…”

Section: Kas Modelmentioning

confidence: 99%

Pyrolysis characteristics, kinetics, and biochar of fermented pine sawdust–based waste

Zhang

Cheng

et al. 2023

Environ Sci Pollut Res

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Pyrolysis characteristics, kinetics and modified biochar derived from pine sawdust after fermentation (FPD) were determined by Fourier Transform Infrared (FTIR), Thermogravimetric analysis (TG) and Scanning Electron Microscopy (SEM), and comparison was established with pine sawdust (PD). The pretreatment i.e. fermentation changed the properties of raw materials and improved the pyrolysis properties.The variation range of CPI values of FPD was 6.51×10 -7 -16.38×10 -7 % 2 •min -2 •°C -3 , significantly higher than that of untreated samples determined under the same experimental conditions. The average activation energy of FPD was 367.95 kJ/mol attained by Flynn-Wall-Ozawa (FWO) method, 389.45 kJ/mol by Kissinger-Akahira-Sonuse (KAS) and 346.55 kJ/mol attained by Starink method much higher than PD. Additionally, fermentation could enhance the adsorption capacity for methylene blue of biochar from 0.76 mg/g to 1.6mg/g due to the abundant surface functional groups and three-dimensional internal pore structure.The adsorption pattern of fermented pine wood shifted from chemisorption dominated to the synergetic adsorption of surface functional groups adsorption and intragranular filling. Pyrolysis kinetics and biochar determination provide an in-depth understanding of fermented pine sawdust pyrolysis behaviors and product characteristics, which is the basis for designing pyrolysis process and re-using fermentation residues.

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Thermal behavior and gas products of cold rolling oily sludge by TG-MS and Py-EGA/MS

Cited by 12 publications

References 28 publications

Adsorption decolorization and composition analysis of high melting point Fischer–Tropsch waxes

Adsorption decolorization and composition analysis of high melting point Fischer–Tropsch waxes

Investigation of NaCl-Modified Graphitic Carbon Nitride for Efficient Biodiesel Production from Waste Oil via Transesterification: A Box–Behnken Design Approach

Pyrolysis characteristics, kinetics, and biochar of fermented pine sawdust–based waste

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