High pressure vegetable tanning of sheepskins using supercritical carbon dioxide

Onem, Ersin; Gülümser, Gürbüz; Renner, Manfred; Yeşil-Çeliktaş, Özlem

doi:10.1016/j.supflu.2015.07.002

Cited by 15 publications

(11 citation statements)

References 15 publications

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“…Various seeds and spices like mustard, ginger, fennel and pepper contain large amounts of phenolic acids [40], and curcuminoids can be found in turmeric [27]. Lignin is the major component of the cell wall of vascular plants [41], while tannins can be found in the seed and skin of grapes [42] and in other exotic fruits [43], but also in the leaves and barks of woods [44]. 8…”

Section: Classification Sourcementioning

confidence: 99%

Natural antioxidants as stabilizers for polymers

Kirschweng

Tátraaljai

Földes

et al. 2017

Polymer Degradation and Stability

157

126

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Section: Classification Sourcementioning

confidence: 99%

Natural antioxidants as stabilizers for polymers

Kirschweng

Tátraaljai

Földes

et al. 2017

Polymer Degradation and Stability

157

126

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“…In the tanning process, vegetable/synthetic tannins or mineral agents (aluminum, chromium, and zirconium) are applied in order to avoid skin putrefaction ( Laurenti et al, 2016 ). These compounds provide greater durability of leather and stabilization of the collagen present in animal skin, avoiding chemical, thermal, and microbiological degradation ( Onem et al, 2015 ). The finishing stage includes rinsing the tanned leather, drying, cutting, and concluding the final aspects to improve its commercial value ( Mosca Angelucci et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Immobilization of the Tannase From Aspergillus fumigatus CAS21: Screening the Best Derivative for the Treatment of Tannery Effluent Using a Packed Bed Reactor

Cavalcanti

Maestrello

Guimarães³

2021

Front. Bioeng. Biotechnol.

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Enzyme immobilization is an important alternative to stabilize enzyme properties favoring the efficiency of derivatives (enzyme + support/matrix) for different purposes. According to this, the current study aimed to immobilize the Aspergillus fumigatus CAS21 tannase and the use of the derivatives in the treatment of the effluent produced by the tannery industry. The tannase was immobilized on sodium alginate, DEAE-Sephadex, amberlite, and glass pearls as supports. Calcium alginate was the most adequate support for tannase immobilization with 100% yield and 94.3% for both efficiency and activity. The best tannase activity for the calcium alginate derivative was obtained at 50°C–60°C and pH 5.0. Thermal and pH stabilities evaluated for 24 h at 30°C–60°C and pH 4–7, respectively, were improved if compared to the stability of the free enzyme. Considering the reuse of the calcium alginate derivative, 78% of the initial activity was preserved after 10 catalytic cycles, and after the 9-month storage at 4°C, the activity was maintained in 70%. This derivative was applied in a packed bed reactor (PBR) for the treatment of tannin-rich effluents from the tannery industry. The reduction of the tannin content was effective reaching degradation of 74–78% after 48 h of PBR operation. The concentration of total phenolic compounds was also reduced, and the color and clarity of the effluent improved. In conclusion, the calcium alginate derivative is an attractive alternative as biocatalyst for large-scale treatment of the effluents from the tannery industry.

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“…SCCO 2 has been reported for use as a medium for the extraction of drugs and for extraction of amino acids, bio-oil, and bioactive components . In leather processing attempts have been made to use SCCO 2 for the vegetable tanning and chrome tanning processes, which resulted in a reduction of time and solid and liquid wastes compared to the conventional tanning process. , SCCO 2 is also used for the recovery of natural fat from the leather industry solid wastes …”

Section: Introductionmentioning

confidence: 99%

“…19 In leather processing attempts have been made to use SCCO 2 for the vegetable tanning and chrome tanning processes, which resulted in a reduction of time and solid and liquid wastes compared to the conventional tanning process. 20,21 SCCO 2 is also used for the recovery of natural fat from the leather industry solid wastes. 22 In this present work, SCCO 2 is applied to achieve deliming without the use of any additional chemicals or water.…”

Section: ■ Introductionmentioning

confidence: 99%

Chemical/Water-Free Deliming Process Using Supercritical Carbon Dioxide: A Step toward Greener Leather Manufacture

Ariram

Sathish

Madhan

2020

ACS Sustainable Chem. Eng.

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Sustainable management plays a vital role in the emerging world, reproducing a pollution-free environment and leading to sustainable growth. In that aspect, leather industries are cornered toward greener leather processes to reduce chemical and water usage. On the same path, deliming is one of the significant steps in the pretanning process to drive into a greener process because the conventional deliming process requires 4% ammonium salts and 100% water, which leads to an enormous amount of ammonium salts in wastewater, leading to eutrophication which adds to the pollution load. To reduce the pollution load, in this work a chemical and water-free deliming process is performed using supercritical carbon dioxide (SCCO 2 ) as a medium as well as deliming agent to remove the lime content from goat skin at 75 bar pressure within 10 min. Also, the utilized CO 2 is collected and reused for the subsequent set of processes. The morphological analysis shows no grain damage on delimed pelts processed using SCCO 2 , and leathers post-tanned from this system exhibit better organoleptic and mechanical strength properties. The developed process opens newer vistas for sustainable development in leather manufacture.

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High pressure vegetable tanning of sheepskins using supercritical carbon dioxide

Cited by 15 publications

References 15 publications

Natural antioxidants as stabilizers for polymers

Natural antioxidants as stabilizers for polymers

Immobilization of the Tannase From Aspergillus fumigatus CAS21: Screening the Best Derivative for the Treatment of Tannery Effluent Using a Packed Bed Reactor

Chemical/Water-Free Deliming Process Using Supercritical Carbon Dioxide: A Step toward Greener Leather Manufacture

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