Method for extracting lignin in biomass material by using ion liquid
A biomass material and ionic liquid technology, applied in the field of lignin extraction from lignocellulosic biomass, can solve the problems of easy pollution, low extraction efficiency, pollution, etc., and achieve easy processing and utilization, high purity, and reduced secondary The effect of secondary pollution
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Embodiment 1
[0019] A method utilizing ionic liquid to extract lignin in biomass material, comprising the following steps:
[0020] 1) After the corn stalks are naturally air-dried, they are crushed into 100-mesh powder by a pulverizer;
[0021] 2) Add the above powdered biomass into ionic liquid 1-allyl-3-methylimidazolium acetate ([Amim]Ac), the mass ratio of biomass to ionic liquid is 5:100, and the temperature is 80 ℃, stirring rate of 1000r / min under the condition of 24h, the biomass is partially dissolved in the ionic liquid to form a suspension;
[0022] 3) Cool the above suspension to 80°C and pour it into a sodium hydroxide solution with a concentration of 0.1mol / L under magnetic stirring conditions. The volume ratio of the suspension to the sodium hydroxide solution is 1:10, and the stirring reaction time is For 1h, filter to obtain the filtrate;
[0023] 4) Adjust the pH of the above filtrate to 2 with hydrochloric acid solution with a concentration of 0.2mol / L, heat and react...
Embodiment 2
[0027] A method utilizing ionic liquid to extract lignin in biomass material, comprising the following steps:
[0028] 1) After the maple sawdust is naturally air-dried, use a crusher to crush it into a 100-mesh powder;
[0029] 2) Add the above powdered biomass into ionic liquid 1-allyl-3-methylimidazolium acetate ([Amim]Ac), the mass ratio of biomass to ionic liquid is 5:100, and the temperature is 110 ℃, stirring rate of 1000r / min under the condition of 24h, the biomass is partially dissolved in the ionic liquid to form a suspension;
[0030] 3) Cool the above suspension to 80°C and pour it into a sodium hydroxide solution with a concentration of 0.1mol / L under magnetic stirring conditions. The volume ratio of the suspension to the sodium hydroxide solution is 1:10, and the stirring reaction time is For 0.5h, filter to obtain the filtrate;
[0031] 4) Adjust the pH of the above filtrate to 2 with hydrochloric acid solution with a concentration of 0.1mol / L, heat and react ...
Embodiment 3
[0035] A method utilizing ionic liquid to extract lignin in biomass material, comprising the following steps:
[0036] 1) After the bluegrass straw is naturally air-dried, it is crushed into a 100-mesh powder by a pulverizer;
[0037] 2) Add the above powdered biomass into ionic liquid 1-ethyl-3-methylimidazolium acetate ([Aeim]Ac), the mass ratio of biomass to ionic liquid is 5:100, and the temperature is 110°C . The stirring rate is 1000r / min and dissolved for 24 hours, and the biomass is partially dissolved in the ionic liquid to form a suspension;
[0038] 3) Cool the above suspension to 80°C and pour it into a sodium hydroxide solution with a concentration of 0.1mol / L under magnetic stirring conditions. The volume ratio of the suspension to the sodium hydroxide solution is 1:10, and the stirring reaction time is For 0.5h, filter to obtain the filtrate;
[0039] 4) Adjust the pH of the above filtrate to 2 with hydrochloric acid solution with a concentration of 0.1mol / L, ...
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