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Method for homogeneously derivatizing plant fiber raw material by taking ionic liquid as medium

A plant fiber and ionic liquid technology, applied in the direction of organic chemistry, can solve problems such as process complexity, environmental pollution, and difficulty in effective solvent recovery, and achieve the effects of simple process, easy dissolution and recovery, and strong industrial application prospects

Inactive Publication Date: 2012-06-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The pretreatment of raw materials and the addition of catalysts will complicate the process, cause environmental pollution, and bring difficulties to the effective recovery of solvents

Method used

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  • Method for homogeneously derivatizing plant fiber raw material by taking ionic liquid as medium
  • Method for homogeneously derivatizing plant fiber raw material by taking ionic liquid as medium
  • Method for homogeneously derivatizing plant fiber raw material by taking ionic liquid as medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh about 0.5 g of pine sawdust and 50.0 g of ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl), put them into a round-bottomed flask, heat to 110°C with microwave, and vigorously stir mechanically for 2 hours. After the dissolution, use a 300-mesh stainless steel filter to filter and separate.

[0040] Add 1.4 g of acetic anhydride to the filtrate, heat at 70° C. for 2 h, and add water to precipitate the product after the reaction is complete. Filtration, washing, and drying yielded a derivatized product with a WPG value of 156%.

Embodiment 2

[0042] Weigh about 0.5 g of pine sawdust and 50.0 g of ionic liquid 1-ethyl-3-methylimidazolium acetate (EmimAc), put them into a round-bottomed flask, heat to 100°C with microwave, and vigorously stir mechanically for 2 hours. After the dissolution, use a 400-mesh stainless steel filter to filter and separate.

[0043] Add 0.7 g of acetic anhydride to the filtrate, heat at 70° C. for 3 h, and add water to precipitate the product after the reaction is complete. Filter, wash, and dry to obtain a derivatized product with a WPG value of 95%.

Embodiment 3

[0045] Weigh about 0.5 g of pine sawdust and 50.0 g of ionic liquid 1-butyl-3-methylimidazolium chloride (BmimCl), put them into a round-bottomed flask, heat to 100°C with microwave, and vigorously stir mechanically for 3 hours. After the dissolution, use a 280-mesh stainless steel filter to filter and separate.

[0046] Add 2.3 g of acetic anhydride to the filtrate, heat at 80° C. for 24 h, and add water to precipitate the product after the reaction is completed. Filtration, washing and drying yielded a derivatized product with a WPG value of 149%.

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Abstract

The invention relates to a method for homogeneously derivatizing a plant fiber raw material by taking an ionic liquid as a medium. The method comprises the following steps of: (1) adding the plant fiber raw material into the ionic liquid; (2) dissolving at the temperature of 80-140 DEG C for 0.5-48 hours to obtain a reaction mixed solution; (3) leaching and separating the reaction mixed solution with a stainless steel filer screen; (4) adding a derivatization reagent into a filtrate, and undergoing an acylation reaction at the temperature of 70-130 DEG C for 1-10 hours; (5) after reacting, adding a precipitant into the mixed solution to separate a product out, filtering and drying to obtain a plant fiber derivatized product; and (6) distilling the filtrate under reducing pressure and recovering to obtain the ionic liquid. The method disclosed by the invention is simple and practicable, and the obtained plant fiber has a high derivatization degree.

Description

technical field [0001] The invention relates to a plant fiber treatment method, in particular to a method for homogeneous derivatization of plant fiber raw materials using ionic liquid as a medium. Background technique [0002] The increasing shortage of petrochemical resources and the severe environmental pollution caused by petrochemical processing have made people gradually turn their attention to the clean production of renewable biomass resources. Plant fiber raw materials are abundant in nature and have a wide range of sources, and have multiple uses in national life and production. Plant fiber raw materials are rich in hydroxyl groups, so their properties can be improved by chemical modification. The modified wood has been greatly improved in terms of thermoplasticity, stability, mechanical properties, moisture absorption and corrosion resistance, and has broad application prospects in the fields of plastics, films, coatings, industrial additives, etc.; at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H8/00C07D233/58
Inventor 李会泉曹妍王学静
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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