Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (02): 140-148.doi: 10.13475/j.fzxb.20210702709

• Dyeing and Finshing & Chemicals • Previous Articles     Next Articles

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. 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 Online:2022-02-15 Published:2022-03-15
  • Contact: GUO Hong E-mail:guo_hong_2012@163.com

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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

CLC Number: 

  • TS102.9

Tab.1

Different reaction conditions of separation process of oxalic acid system"

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

Fig.1

Comparison of separation effect of waste polyester/cotton blended fabric in hydrochloric acid and oxalic acid system"

Tab.2

Recovery rate of polyester fiber and yield of cellulose obtained under different reaction conditions"

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

Fig.2

SEM images of waste polyester/cotton blended fabric treated with oxalic acid under different reaction conditions"

Fig.3

SEM images of separated products(×500). (a) Waste polyester/cotton blended fabric; (b) Separated polyester fiber; (c)Separated cellulose"

Fig.4

FT-IR (a) and XRD (b) spectra of original sample and separated polyester fiber"

Fig.5

FT-IR (a) and XRD (b) spectra of cotton fiber and separated cellulose"

Fig.6

Thermogravimetric curves of original sample and separated polyester fiber"

Fig.7

Efficiency diagram of waste polyester/cotton blended fabric separated by oxalic acid system"

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