水热辅助酸法的革屑脱铬研究  

Study on Chromium Removal of Leather Scraps by Hydrothermal Assisted Acid Method

作　　者：王邵腾 陈慧[1] 单志华[1] WANG Shaoteng;CHEN Hui;SHAN Zhihua(National Engineering Laboratory for Clean Technology of Leather Manufacture,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学制革清洁技术国家工程室,四川成都610065

出　　处：《皮革科学与工程》2022年第2期26-31,共6页Leather Science and Engineering

基　　金：企业委托项目(基于污泥低铬及可循环利用的制革工艺及关键材料研究19H0921)。

摘　　要：采用草酸钠脱铬率达到94.9%后革屑表面形貌和热稳定性发生了显著变化。进一步用水热法处理脱铬革屑制得革屑水解物。结果表明在脱铬革屑固含量为10%,温度为110℃条件下,于水热釜中反应7 h,得到重均相对分子质量M_(w)=2.86×10^(5),灰分含量为0.530%,铬含量为944 mg/kg的革屑水解物。可见采用草酸钠浸出铬和水热法联用的方式可以得到相对分子质量较高、灰分较低的革屑水解物,为铬革屑资源化提供新途径。The surface morphology and thermal stability of leather scraps were significantly changed by using sodium oxalate to remove chromium 94.9%.The hydrolysate of collagen was further prepared by hydrothermal treatment of dechromed leather scraps.The results showed that the collagen hydrolysate with a heavy average molecular weight M_(w)=2.86×10^(5) g/mol,an ash content of 0.530%and a chromium content of 944 mg/kg was obtained by reacting the dechromated leather scraps at a solid content of 10%and a temperature of 110℃for 7 h in a hydrothermal reactor.It can be seen that the combination of chromium leaching by sodium oxalate and hydrothermal method can obtain collagen hydrolysate with high molecular weight and low ash content,which can provide a novel way to resource the chromium leather scraps.

关 键 词：制革工业 铬革屑 革屑水解物 资源化利用 

分 类 号：TS59[轻工技术与工程—皮革化学与工程]