草酸稀溶液高效分离废旧聚酯/棉混纺织物

doi:10.13475/j.fzxb.20210702709

纺织学报 ›› 2022, Vol. 43 ›› Issue (02): 140-148.doi: 10.13475/j.fzxb.20210702709

草酸稀溶液高效分离废旧聚酯/棉混纺织物

史晟¹^,²^,³, 王彦¹^,², 李飞²^,⁴, 唐建东²^,³, 高翔宇⁴, 侯文生¹^,², 郭红¹^,²(), 王淑花¹^,², 姬佳奇¹^,²

1.太原理工大学轻纺工程学院, 山西晋中 030600
2.纺织行业废旧涤棉纺织品清洁再生重点实验室,山西晋中 030600
3.际华三五四二纺织有限公司, 湖北襄阳 441000
4.安徽天助纺织科技集团股份有限公司, 安徽阜阳 236000

收稿日期:2021-07-07 修回日期:2021-12-03 出版日期:2022-02-15 发布日期:2022-03-15
通讯作者: 郭红
作者简介:史晟(1986—),男,讲师,博士。主要研究方向为纺织材料的循环利用。
基金资助:
国家自然科学基金项目(21802101);国家自然科学基金项目(51903184);山西省自然科学基金项目(20210302124058);山西省自然科学基金项目(20210302124492)

Efficient separation of polyester and cotton from waste blended fabrics with dilute oxalic acid solution

SHI Sheng¹^,²^,³, WANG Yan¹^,², LI Fei²^,⁴, TANG Jiandong²^,³, GAO Xiangyu⁴, HOU Wensheng¹^,², GUO Hong¹^,²(), WANG Shuhua¹^,², JI Jiaqi¹^,²

1. College of Textile Engineering, Taiyuan University of Technology, Jinzhong, Shanxi 030600, China
2. Key Laboratory of Waste Polyester Cotton Textiles for Cleaning and Regeneration in Textile Industry, Jinzhong, Shanxi 030600, China
3. Jihua 3542 Textile Co., Ltd., Xiangyang, Hubei 441000, China
4. Anhui Tianzhu Textile Science Technology Co., Ltd., Fuyang, Anhui 236000, China

Received:2021-07-07 Revised:2021-12-03 Published:2022-02-15 Online:2022-03-15
Contact: GUO Hong

摘要/Abstract

摘要：

针对废旧纺织品循环利用中聚酯纤维、棉纤维混纺纱线结构紧密缠绕,难以分离而无法加工的问题,采用环境友好的草酸体系选择性水解混纺织物中的棉纤维,从而释放聚酯纤维实现有效分离,并对草酸体系分离工艺进一步优化。研究表明:与无机酸相比,在相同反应条件下,草酸可达到与盐酸相当的分离效果且所得聚酯纤维形态更完整,棉纤维水解程度更低,水解产物分布更窄;在草酸浓度为0.07 mol/L、反应温度为130 ℃、反应时间为3 h的条件下,聚酯/棉混纺织物的分离效果最优;其中棉纤维水解为纤维素材料,得率为91.46%,另有小部分水解为葡萄糖或低聚糖;聚酯纤维回收率高达99.28%,且保留了原有聚酯纤维的性能,可直接生产加工;该反应体系可循环利用多次,实现了废旧聚酯/棉混纺织物的高效综合利用。

关键词: 废旧聚酯/棉混纺织物分离, 草酸, 选择性水解, 循环利用

Abstract:

In view of the problem that tightly twisted polyester and cotton fibers in blended yarns are difficult to separate and hence unable to be processed in the recycling of waste textiles, an environmentally friendly oxalic acid system was used to selectively hydrolyze the cotton fiber of blended fabric hence releasing the polyester fiber to achieve effective separation. The conditions of oxalic acid treatment were further optimized. The results show that oxalic acid can achieve the same separation effect as hydrochloric acid under the same reaction conditions, and the morphology of polyester fiber is more complete, the hydrolysis degree of cotton fiber is lower and the distribution of hydrolysate is narrower. When the oxalic acid concentration is 0.07 mol/L, the reaction temperature is 130 ℃ and the reaction time is 3 h, the separation effect of polyester and cotton in the blended fabric reach the best level, where the yield of cotton fiber hydrolyzed into cellulose reaches 91.46%, with a small part being hydrolyzed into glucose or other oligosaccharides. The recovery ratio of polyester fiber is as high as 99.28%, retaining the original physical and chemical properties, which can be directly processed for textile production. The reaction system can be used for many times, facilitating the high efficiency and comprehensive utilization of waste polyester/cotton blended fabrics.

Key words: separation of waste polyester/cotton fabric, oxalic acid, selective hydrolysis, recycling

中图分类号:

TS102.9

史晟, 王彦, 李飞, 唐建东, 高翔宇, 侯文生, 郭红, 王淑花, 姬佳奇. 草酸稀溶液高效分离废旧聚酯/棉混纺织物[J]. 纺织学报, 2022, 43(02): 140-148.

SHI Sheng, WANG Yan, LI Fei, TANG Jiandong, GAO Xiangyu, HOU Wensheng, GUO Hong, WANG Shuhua, JI Jiaqi. Efficient separation of polyester and cotton from waste blended fabrics with dilute oxalic acid solution[J]. Journal of Textile Research, 2022, 43(02): 140-148.

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编号	草酸浓度/ (mol·L^-1)	反应温度/℃	反应时间/h	编号	草酸浓度/ (mol·L^-1)	反应温度/℃	反应时间/h
1^#	0.01	150	3	12^#	0.49	150	3
2^#	0.03	150	3	13^#	1.40	150	3
3^#	0.05	150	3	14^#	0.07	120	3
4^#	0.07	150	3	15^#	0.07	130	3
5^#	0.09	150	3	16^#	0.07	140	3
6^#	0.11	150	3	17^#	0.07	160	3
7^#	0.14	150	3	18^#	0.07	130	1
8^#	0.21	150	3	19^#	0.07	130	2
9^#	0.28	150	3	20^#	0.07	130	4
10^#	0.35	150	3	21^#	0.07	130	5
11^#	0.42	150	3

编号	聚酯纤维回收率/%	纤维素得率/%	编号	聚酯纤维回收率/%	纤维素得率/%
1^#	^*	49.21	12^#	98.73	81.01
2^#	^*	84.96	13^#	98.73	70.85
3^#	^*	85.99	14^#	^*	77.83
4^#	98.92	89.26	15^#	99.28	91.46
5^#	98.73	87.70	16^#	99.04	89.64
6^#	98.54	83.57	17^#	98.41	76.85
7^#	98.33	84.20	18^#	^*	24.80
8^#	98.62	82.31	19^#	^*	88.41
9^#	98.36	84.54	20^#	99.22	88.93
10^#	98.69	82.88	21^#	99.12	88.11
11^#	98.46	82.43

草酸稀溶液高效分离废旧聚酯/棉混纺织物

Efficient separation of polyester and cotton from waste blended fabrics with dilute oxalic acid solution

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