Kinetic model of the thermal pyrolysis of chrome tanned leather treated with NaOH under different conditions using thermogravimetric analysis

Bañón, Elena; Marcilla, A.; García, A N Jesús; Martínez, Pascual; León, Milagros

doi:10.1016/j.wasman.2015.10.012

Cited by 54 publications

(12 citation statements)

References 40 publications

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“…Meanwhile, the comparison of DTG curves reveals that crosslinking has a significant impact on the thermal degradation behavior of leather fiber. In the study of Bañón et al, a shoulder peak in DTG curve was observed too [30]. In the case of Caballero et al, however, no shoulders were found at high temperatures in the DTG curves of tannery waste [18].…”

Section: Deconvolution Methodsmentioning

confidence: 89%

“…The shoulder peak provided significant hints on the complexity of the thermal decomposition of the leather fiber. Bañón et al similarly reported the emergence of shoulder peak in the DTG curve of chrome tanned leather [30]. Marcilla et al evaluated the effect of tanning process on pyrolysis of tannery wastes and a shoulder peak could be clearly seen on the DTG curves of leathers tanned with different tanning agents [28].…”

Section: The Overall Tg/dtg Curvesmentioning

confidence: 96%

“…The main step of mass loss from 150 to 600°C (region 2) is assigned to the decomposition of the collagen. It was reported that the gas released from leather sample by pyrolysis under N 2 atmosphere included H 2 , CH 4 , CO, CO 2 , C 2 H 4 , C 2 H 6 , SO 2 , NH 3 , toluene and other hydrocarbons [28][29][30]. The TG curve in Fig.…”

Section: The Overall Tg/dtg Curvesmentioning

confidence: 96%

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Kinetics and mechanism of thermal degradation of vegetable-tanned leather fiber

Liu

Luo

et al. 2019

J Leather Sci Eng

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Thermal degradation of vegetable-tanned leather fiber (VLF) was investigated by thermogravimetric analysis aiming to know the exact kinetics and degradation mechanism. The thermogravimetric (TG) and differential thermogravimetric (DTG) curves showed that decomposition of the VLF occurs mainly in the range of 150-600°C, and the latter exhibits asymmetrical peak with a pronounced shoulder. The decomposition process was first analyzed by deconvolution of the experimental DTG curves, followed by reconstruction of the weight loss profiles of two individual processes. Several common isoconversional approaches were applied to calculate the activation energy over a wide range of conversion for the sample, including modified Kissinger-Akahira-Sunose (MKAS), Friedman, and Flynn-Wall-Ozawa. The average activation energy of vegetable-tanned leather fiber was found to be 241.9 kJ mol − 1 by MKAS method. The activation energy values obtained for the pseudocomponents representing highly-crosslinked and low-crosslinked collagen in VLF were given as 190.6 and 124.8 kJ mol − 1 , respectively. Generalized master plots results suggested that the reaction mechanism for highly-crosslinked collagen follows the random nucleation and growth process at conversion values lower than 0.5. When the conversion is higher than 0.5, the mechanism tends to random scission model. For low-crosslinked collagen, the degradation is mainly governed by random nucleation and nuclei growth. The gaseous products of VLF thermal degradation were analyzed with an online-coupled TG-Fourier transform infrared spectroscopy system.

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Section: Deconvolution Methodsmentioning

confidence: 89%

Section: The Overall Tg/dtg Curvesmentioning

confidence: 96%

Section: The Overall Tg/dtg Curvesmentioning

confidence: 96%

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Kinetics and mechanism of thermal degradation of vegetable-tanned leather fiber

Liu

Luo

et al. 2019

J Leather Sci Eng

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“…The high Cr content leads to challenges in terms of waste treatment, and heavy pollution is associated with the treatment of tanned leather scrap and tanning baths. Hence, finding alternative uses of waste chromium‐containing leather is of interest . In this respect, some processes have recently been developed to recycle leather and use it in different applications (e.g., pigments) .…”

Section: Introductionmentioning

confidence: 99%

“…Hence, finding alternative uses of waste chromium-containing leather is of interest. [29][30][31][32][33][34][35] In this respect, some processes have recently been developed to recycle leather and use it in different applications (e.g.,p igments). [36,37] With respectt oc atalysis, chromium-tanned leather can be regarded as ah eterogeneous chromium-based catalyst embedded in an organic support composed of collagen and other skin components (proteins, amino acids;see Scheme 2f or at entative structure of the Cr complex formed with leather;o ther types of cross-linking Cr species may also be present).…”

Section: Introductionmentioning

confidence: 99%

Leather‐Promoted Transformation of Glucose into 5‐Hydroxymethylfurfural and Levoglucosenone

et al. 2019

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Steam explosion as pretreatment to increase gelatin extraction yield from chromium tanned leather wastes

Scopel

Restelatto

Baldasso

et al. 2018

Env Prog and Sustain Energy

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Alkaline hydrolysis of chromium tanned leather wastes (CTLW) is a promising process that allows turning this waste into valuable materials, especially into protein, recovered as gelatin. Steam explosion, which is a fast, chemical‐free, and efficient process, was tested in this work as a pretreatment to open up the fibrous structure of CTLW and ease gelatin extraction through subsequent alkaline hydrolysis, increasing the process yield. Two steam explosion temperatures (130 °C and 150 °C) and residence times (5 and 15 min) were tested. The gelatin extracted in aqueous medium was characterized according to its dry mass content, ash content, viscosity, protein content, chromium content, and helix‐to‐coil transition temperature. CTLW steam exploded in more aggressive conditions (150 °C, 15 min) allowed the extraction of three times more protein when compared to CTLW without any pretreatment. However, samples treated at 150 °C produced lower‐quality (partially degraded) gelatin. Steam explosion performed at 130 °C for 15 min almost doubled protein extraction and resulted in a better quality gelatin. This is a promising process for the proper use of CTLW as raw material for the production of high added‐value products. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 367–373, 2019

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Kinetic model of the thermal pyrolysis of chrome tanned leather treated with NaOH under different conditions using thermogravimetric analysis

Cited by 54 publications

References 40 publications

Kinetics and mechanism of thermal degradation of vegetable-tanned leather fiber

Kinetics and mechanism of thermal degradation of vegetable-tanned leather fiber

Leather‐Promoted Transformation of Glucose into 5‐Hydroxymethylfurfural and Levoglucosenone

Steam explosion as pretreatment to increase gelatin extraction yield from chromium tanned leather wastes

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