Based on carbon dioxide properties and its solubility in water, carbon dioxide deliming principle and mass transfer were analyzed, respectively. Economics The economics of the process are affected by prolonged production times and the cost of CO 2 and alternative bates as compared with the cost of ammonium salts. The use of carbon dioxide eliminates this effect, as it does not cause a sudden drop in the pH, since it is added in small doses either continuously or intermittently, thus reducing the pH gradually to the desired level. The addition of sodium hydrogen sulphite or hydrogen peroxide at the beginning of the deliming can prevent the emission of hydrogen sulphide gas. You can change the cookie settings in your browser.
A tannery processing 25 tonnes of raw hides per day would need to invest about EUR The time required is the same or even less than with the conventional deliming processes approximately Fielded search Clean technology denomination. Hydrogen peroxide can be corrosive to wooden drums. Review Carbon dioxide deliming in leather production: If the pH at the end of the deliming process is below or above the pH recommended for optimal activity of conventional bating enzymes, the subsequent bating step may require adaptation by using different bating enzymes with optimal activity in the lower pH range.
The way the CO 2 is introduced into the float depends on the type of vessel used. The main driving force for the implementation of this technique is a need or wish to reduce the discharge of ammoniacal nitrogen in the effluent. Fielded search Carbon dioxide deliming in leather production a literature review technology denomination. Achieved environmental benefits CO 2 deliming can reduce nitrogenous discharges.
Problems arise when CO 2 deliming is applied to ovine skins which have been dewooled using sulphides, since the amount of sulphide used is greater than that for bovine hides. Technical description Carbon dioxide deliming is generally regarded as a practicable technique that can considerably reduce the environmental impact of this operation.
Carbon dioxide deliming in leather production: a literature review – ScienceDirect
Additionally this review provided the possible ways forwards of this technology. Also, bates with a lower content of ammonium are available. For more information, visit the cookies page.
Cross media effects If the final pH of deliming is lower than the pH after ammonium deliming, there is a risk of hydrogen sulphide being generated. You’re going to remove this assignment.
The use of ammonium compounds in deliming is replaced partially or completely by the injection carbon dioxide deliming in leather production a literature review carbon dioxide gas.
Problems arise when CO 2 deliming is applied to ovine skins which have been dewooled using sulphides, since the amount of sulphide used is greater Thin or split hides less than 1. Recommended articles Citing articles 0. Abstract In this article, carbon dioxide deliming development in leather process was comprehensively reviewed.
In this article, carbon dioxide deliming development in leather process was comprehensively reviewed.
The complete replacement of ammonium compounds by CO2 deliming cannot be applied to the processing of materials whose thickness is over 1. The tannery usually leases the container. Assign to other user Search user Invite. The portal can access those files and use them to remember the user’s data, such as their chosen settings screen view, interface language, etc. If the pH of the CO 2 deliming float is lower than that obtained using ammonium salts, special bates can be used.
The addition of sodium hydrogen sulphite or hydrogen peroxide at the beginning of the deliming can prevent the emission of hydrogen sulphide gas. Relevant keywords air pollutant carbon dioxide deliming in leather production a literature review chromium halogenated pollutant industrial effluent industrial efluent industrial efluents volatile organic compound waste recovery water saving.
You have to log in to notify your friend by e-mail Login or register account. Search by free text. It was creative to reuse CO 2 with available absorption and desorption technology. Abstract In this article, carbon dioxide deliming development in leather process was comprehensively reviewed.
However, sodium hydrogen sulphite releases sulphur dioxide. Substitution of ammonium compounds by CO2 The use of ammonium compounds in deliming is replaced partially or completely by the injection of carbon dioxide gas.
However, considerable savings can be achieved if deliming using organic acids is replaced with carbon dioxide deliming.
A disadvantage with conventional deliming is carbon dioxide deliming in leather production a literature review acid is added in concentrated form, which causes a localised pH drop, forcing open the pores and making the finished hide much coarser.
If CO 2 is used in the deliming, the final pH at the end of the process can be somewhat lower pH 6. CO 2 deliming can reduce nitrogenous discharges.