Acidic deep eutectic solvent treatment for viscosity control and reactivity enhancement of bamboo dissolving pulp

Duan, Chao; Feng, Xiuli; Tian, Chaochao; Tian, Guodong; Nie, Shuai

doi:10.1007/s10570-023-05043-9

Cited by 11 publications

(3 citation statements)

References 40 publications

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“…However, after mechanical treatment of wheat straw, the CrI value decreased significantly, which may be due to the relative weakening of the hydrogen bond force between wheat straw fibers due to the force generated by the mechanical treatment process, resulting in the destruction of a part of the crystallization area [ 45 ]. Compared with mechanical treatment, the CrI value of the pulp increased after DES treatment, and the CrI value was 40.51% under the optimal conditions of 110 °C, 1:40, and 6 h. The increase in pulp crystallinity may be attributed to the removal of lignin and the acid hydrolysis of the non-crystalline regions of cellulose promoted by acidic DES, which increased the proportion of crystalline regions [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…Dugoni et al [ 19 ] used choline acetate (ChOAc) as a hydrogen bond acceptor (HBA) and glycolic acid (GlyA), levulinic acid (LevA), and imidazole (Im) as hydrogen bond donors (HBDs) to prepare three novel deep eutectic solvents (DESs); it was found that after ChOAc:LevA treatment, lignin was completely removed, and the hemicellulose decreased by 40–50%. Duan et al [ 20 ] investigated the effects of acidic, alkaline, and neutral DESs on the lignin-removal performance of bamboo dissolving pulp. The choline chloride/oxalic acid acidic DES system has the best delignification effect because many activated protons (H + ) in the acidic DES can destroy the fiber structure effectively and the addition of the acidic DES promotes the swelling of the fiber, which in turn improves accessibility.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Dissolving Pulp by Combined Mechanical and Deep Eutectic Solvent Treatment

Li,

Chen,

Wang

et al. 2023

Polymers

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Grasses are potential candidate to replace wood as a raw material for pulping and paper making, and several processes have been developed to produce grass pulp. In this study, wheat straw was used as raw material, and the possibility of sequential treatment with a mechanical method and deep eutectic solvent (DES) to prepare high-quality dissolving pulp was explored. Firstly, the wheat straw was mechanically treated, and then the wheat straw was delignified using a choline chloride–lactic acid deep eutectic solvent. The results showed that the optimal treatment conditions of deep eutectic solvent were 110 °C, 6 h, and a solid–liquid ratio (ratio of pulp to DES) of 1:40. The removal rate of lignin was 82.92%, the glucose content of pulp was increased by 11.42%. The DES recovery rate was further calculated, and the results showed that the DES recovery rate was more than 50% with rotary evaporation. The pulp viscosity after bleaching was 472 mL/g, and the α-cellulose accounted for 81.79%. This treatment has advantages in biomass refining, and the total utilization rate of wheat straw reaches 72%. This study confirmed that combined mechanical and deep eutectic solvent treatment can effectively remove lignin from wheat straw to produce high-quality wheat straw dissolving pulp.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of Dissolving Pulp by Combined Mechanical and Deep Eutectic Solvent Treatment

Li,

Chen,

Wang

et al. 2023

Polymers

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“…Moreover, the high viscosity and reclamation were still the defect. Similar to ILs, DESs also dissolve cellulose through hydrogen bonding competition, especially in dissolving pulp, which can significantly reduce viscosity and greatly improve reactivity [31,32] …”

Section: Dissolution Of Cellulosementioning

confidence: 99%

Cellulose Dissolution, Modification, and the Derived Hydrogel: A Review

Wu,

Li,

Zhang

et al. 2023

ChemSusChem

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The development of cellulose‐based hydrogel has occupied a pivotal position in almost all walks of life. However, the native cellulose can not be directly used for preparing hydrogel due to the complex non‐covalent interactions. Some literature has discussed the dissolution and modification of cellulose but has yet to address the influence of the pretreatment on the as‐prepared hydrogels. Firstly, the "touching" of cellulose by derivative and non‐derivative solvents was introduced, viz., the dissolution of cellulose. Secondly, the "conversion" of functional groups on the cellulose surface by special routes, viz., the modification of cellulose. The above‐mentioned two parts were intended to explain the changes in physicochemical properties of cellulose by these routes and their influences on the subsequent hydrogel preparation. Finally, we summarized the “reinforcement” of cellulose‐based hydrogels by physical and chemical techniques, viz., improving the mechanical properties of cellulose‐based hydrogels and the changes in the multi‐level structure of the interior of cellulose‐based hydrogels.

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Deep eutectic solvents as pretreatment to increase Fock’s reactivity under optimum conditions

Arce,

Llano,

Mowinckel

et al. 2023

Cellulose

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Acidic deep eutectic solvent treatment for viscosity control and reactivity enhancement of bamboo dissolving pulp

Cited by 11 publications

References 40 publications

Preparation of Dissolving Pulp by Combined Mechanical and Deep Eutectic Solvent Treatment

Preparation of Dissolving Pulp by Combined Mechanical and Deep Eutectic Solvent Treatment

Cellulose Dissolution, Modification, and the Derived Hydrogel: A Review

Deep eutectic solvents as pretreatment to increase Fock’s reactivity under optimum conditions

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