Preparation And Application Of Tanning Ecological Problem - Chrome Tanning Agent

Tanning agent which converts skins or hides into leather is a chemical material having close relationship to ecology. Among all tanning agents, chrome tanning agent is the best one which has good performance that the others can not compete to it. hi a long time in the future, chrome tannage is still the most important tanning method.Two main ways in industry traditionally were used to prepare chrome tanning agents: one is using sugar as reducing agent, another is using sulfur dioxide. Chrome tanning agents prepared from sugar have some masking effect, but in fact sugar often is oxidized to very complicated middle outcomes in production process. This made qualities of the chrometan not stable and brought some trouble to tanning. When sulfur dioxide was used as reducing agent to produce chrome tanning agents, though production process is easily controlled and qualities of the product are stable, the tanning agent is lack of masking effect so that leather made with it is some tinny.To get over shortages of above tow reducing methods, a new preparation method is invented to produce chrome tanning agent in this paper, which is vitally important innovation.A systematic study was conducted to oxidation-reduction reaction of many kinds of small molecule alcohol with bichromate. A detailed analysis was conducted to reaction process. The drying process of chrome liquor was studied. The structure and property of chrome complex reducing by alcohol were analysed and tokened by many present well-rounded separation and analysis methods such as IR, UV-Vis Spectrum, IEC and pH potentiometry. Application tests of chrome tanning agents were conducted and tanning methods of tanning at high pH were studied. A systematic study was conducted on high alkalinity chrome tanning agents application in leather making process and possibility of clean chrome tanning was discussed.The results have indicated that chrome tanning agent with good tanning property and high utilization ratio can be gotten by selecting proper alcohol as reducing agents. This is a forceful promotion to tanning ecology.