Mechanism of xanthation reaction in viscose process

被引：14
|
作者：
Gondhalekar, Sachin C. [1 ]
Pawar, Pravin J. [1 ]
Dhumal, Sunil S. [1 ]
Thakre, Shirish S. [1 ]
机构：
[1] Aditya Birla Sci & Technol Co Pvt Ltd, Fibre & Text Div, Taloja Midc, Maharashtra, India
来源：
CELLULOSE | 2019年 / 26卷 / 03期
关键词：
Xanthation kinetics; Bulk diffusion; Kinetics; Mass transfer; Avrami kinetics; KINETICS;
D O I：
10.1007/s10570-018-2213-5
中图分类号：
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号：
0805 ; 080502 ; 0822 ;
摘要：
Xanthation reaction in viscose process is heterogeneous reaction (gaseous CS2-wet alkaline cellulose) complicated with side reactions. Commercial requirement of CS2 in viscose process is 32-34%, which is significantly higher than the stoichiometric requirement (23.5% w/w of the cellulose) due to formation of byproducts. Detailed xanthation reaction kinetics study was performed to understand the xanthate and by-products formation mechanism along with effect of mass transfer and its possible impact on CS2 consumption. Heterogeneous nature of the xanthation reaction offers significant mass transfer resistance and was hypothesized to be driven by CS2 partitioning into wet alkali cellulose and its unstable complex (DTCdithiocarbonate) formation with alkali. Xanthation reaction mechanism in the form of physico-chemical process steps has been proposed with experimental justification. [GRAPHICS] .
引用
收藏
页码：1595 / 1604
页数：10
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