Fig. 12. Comparative results of GWP and GNE-617 consumption for both new and traditional tanning processes (lower acetone losses).Figure optionsDownload full-size imageDownload as PowerPoint slide
The dehydrated hides can be transformed into stabilised leather by immersing the hides in an aqueous solution of chemical products after a short period of application.
The quality and the properties of the leathers manufactured with the new system are similar to those obtained with the traditional one.
When assessing the environmental impact of the new system, consumption of chemical products, water and process time with the new system in respect to the conventional process, there are reductions of 30.6% in water use, 50.2% in chemical use and 16.4% in process time. In addition, a reduction of 27.3% in wastewater and a reduction of 47.5% of thermal energy consumption are obtained. However, this new system presents an increase in electricity consumption of 63.03% and an increase in gaseous emissions of 75% due to the use of acetone in the dehydration process and the 0.5% losses of acetone during the process. Based on these results, the proposals of improvements in the prototype have been presented to reduce the losses of acetone during the process.