The high-boiling alcohol degumming paves an innovative approach to the environment-friendly and high-efficiency preparation of ramie fiber, while it remains challenging to the high reagent cost and discharge of black liquor. In this work, the possibility of glycol recycling degumming and solvent recovery was investigated, and the influence of recycling times of degumming liquid on fiber structure and physical properties, recovery rate of solvents and functional groups in black liquor solids was appraised. The results revealed that each cycle of degumming removed all the wax and pectin in ramie, achieved above 95.5 % of cellulose, and reached 71.3 ∼ 73.5 % of fiber yield, 4.9 ∼ 6.0 dtex of linear density, 5.5 ∼ 8.7 cN/dtex of tenacity, respectively, which fulfilled the requirement of spinning process. Hence, it suggested that degumming solution could be reused at least five times in the recycling degumming process of ramie, of which the first, second and third cycles of degumming gained the best physical properties of fiber. Furthermore, solvent recovery rate reached 99.41 % after the first degumming, and still as high as 98.93 % after the fifth cycle of degumming, indicating a superior solvent recovery. A relatively complete structure of lignin was contained in the black liquor solid, and the contents of lignin and hemicellulose gradually accumulated with the increase of the number of degumming cycles. To sum up, the recycling degumming of ramie with glycol has the prominent feasibility of reducing reagent cost, environmental pollution, and realizing resource recycling, which raised the application prospects of natural fiber isolation.

高沸点酒精脱胶为to麻纤维的环保，高效制备铺平了道路，同时仍然对高试剂成本和黑液排放提出了挑战。在这项工作中，研究了乙二醇循环脱胶和溶剂回收的可能性，并评估了脱胶液体的循环时间对纤维结构和物理性能，黑液固体中溶剂和官能团的回收率的影响。结果表明，每个脱胶周期都除去了麻中的所有蜡和果胶，纤维素含量达到95.5％以上，纤维产量达到71.3〜73.5％，线密度为4.9〜6.0 dtex，强度为5.5〜8.7 cN / dtex。分别满足纺丝工艺要求。因此，这表明脱胶溶液可以在of麻的循环脱胶过程中重复使用至少五次，其中第一，第二和第三循环脱胶获得了纤维的最佳物理性能。此外，第一次脱胶后的溶剂回收率达到99.41％，而在第五次脱胶循环后仍高达98.93％，表明溶剂回收率较高。黑液固体中含有相对完整的木质素结构，并且随着脱胶循环次数的增加，木质素和半纤维素的含量逐渐积累。综上所述，glycol麻与乙二醇的循环脱胶具有降低试剂成本，环境污染，实现资源循环利用的显着可行性，提高了天然纤维分离的应用前景。