以制革废弃物制备的复合氨基酸材料及其清洁脱灰

doi:10.19677/j.issn.1004-7964.2022.06.003

皮革科学与工程 ›› 2022, Vol. 32 ›› Issue (6): 13-18.doi: 10.19677/j.issn.1004-7964.2022.06.003

以制革废弃物制备的复合氨基酸材料及其清洁脱灰

王浩¹, 雷超², 曾运航^1,*, 石碧^1,2

1.四川大学制革清洁技术国家工程实验室,四川成都 610065;
2.四川大学皮革化学与工程教育部重点实验室,四川成都 610065

收稿日期:2022-05-23 出版日期:2022-12-28 上线日期:2022-11-22
通讯作者: * 曾运航（1985-）,女,教授,主要研究方向为制革生物技术和制革清洁技术,E-mail:zengyunhang@scu.edu.cn。
作者简介:王浩（1997-）,男,硕士研究生,E-mail:wanghao6180001@163.com。
基金资助:
国家自然科学基金（21878193）

Compound Amino Acids Prepared by Using Leather Waste for Clean Deliming

WANG Hao¹, LEI Chao², ZENG Yunhang^1,*, SHI Bi^1,2

1. National Engineering Laboratory for Clean Technology of Leather Manufacture,Sichuan University, Chengdu 610065, China;
2. Key Laboratory of Leather Chemistry and Engineering, Ministry of Education,Sichuan University, Chengdu 610065, China

Received:2022-05-23 Online:2022-12-28 Published:2022-11-22

摘要/Abstract

摘要： 传统脱灰工序使用的大量铵盐是制革氨氮（NH₃-N）污染的主要来源。用无氨脱灰剂替代铵盐脱灰是从源头消除NH₃-N污染的有效途径,但现有的无氨脱灰剂或pH缓冲性差、渗透慢,或成本较高,或具有毒性。用制革过程产生的废弃牛毛和生皮边角料作为原料,制备了高效价廉的复合氨基酸脱灰剂。通过优化硫酸水解条件制得的脱灰剂中游离氨基酸含量约40%。用上述脱灰剂对浸灰牛皮进行脱灰,结果表明：复合氨基酸能与浸灰裸皮内的碱性物质作用形成pH 9左右的缓冲体系,快速渗透裸皮,并有效脱除裸皮中的石灰。与硫酸铵脱灰相比,复合氨基酸脱灰废液的NH₃-N和总氮浓度分别下降了94%和64%以上。

关键词: 皮革, 脱灰, 氨氮, 氨基酸, 牛毛, 生皮边角料

Abstract: The large amount of ammonium salts used in the conventional deliming process is the main source of ammonia nitrogen (NH₃-N) pollution in the leather manufacture. Replacing the ammonium salts with ammonia-free deliming agents for the deliming is an effective way to eliminate the NH₃-N pollution from the source. However, the existing ammonia-free deliming agents have inadequate pH buffering capacity, slow penetration, high cost, or toxicity. The bovine hair waste and hide scraps from the leather-making processes were used as raw materials to prepare compound amino acids for clean deliming. The deliming agents with amino acid content of approximately 40% were obtained by optimizing sulfuric acid-hydrolyzing conditions. The obtained deliming agents were then used to delime limed cattle hides. Results showed that the compound amino acids formed a buffer of pH approximately 9 after reacting with the alkali in the limed hide, penetrated the hide rapidly, and removed the lime from the hide effectively. The concentrations of NH₃-N and total nitrogen in the deliming effluents by using the compound amino acids were decreased by more than 94% and 64%, respectively, compared to those of ammonium sulfate deliming effluent.

Key words: leather, deliming, ammonia nitrogen, amino acid, bovine hair, hide scraps

中图分类号:

TS541

王浩, 雷超, 曾运航, 石碧. 以制革废弃物制备的复合氨基酸材料及其清洁脱灰[J]. 皮革科学与工程, 2022, 32(6): 13-18.

WANG Hao, LEI Chao, ZENG Yunhang, SHI Bi. Compound Amino Acids Prepared by Using Leather Waste for Clean Deliming[J]. Leather Science and Engineering, 2022, 32(6): 13-18.

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以制革废弃物制备的复合氨基酸材料及其清洁脱灰

Compound Amino Acids Prepared by Using Leather Waste for Clean Deliming

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