Method for preparing furfural by preprocessing grass fiber papermaking raw material and related comprehensive utilization method thereof
A grass and raw material technology is applied in the green process for pretreatment to prepare furfural and then in the field of papermaking, which can solve the problems of consuming a large amount of water vapor and thermal energy, and achieve the effects of reducing the amount of lye, protecting the ecological environment and reducing costs.
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Embodiment 1
[0036] Grind the dry reed with a universal high-speed pulverizer, select particles with a particle size of 1 to 3 cm, weigh 20 g as a raw material, and add the prepared [Hmim]HSO with a concentration of 5%. 4 Solution 75g, sodium chloride 20g to adjust the pH of the ionic liquid solution = 0.20, mix well and put it into the reactor, heat up to 80°C, after the hydrolysis reaction for 7 hours, feed water vapor, take the furfural generated by the reaction out to condense, and collect water Vapor condensate. The furfural yield was measured to be 2.51%. (The water vapor introduced can come from the 1atm, 100℃ low-pressure and high-temperature steam produced by the steam generator, or from the low-pressure and high-temperature steam produced by the cooking and alkali recovery process of the paper mill, the same below)
Embodiment 2
[0038] Grind the dried reeds with a universal high-speed pulverizer, select particles with a particle size of 1 to 3 cm, weigh 30 g as a raw material, and prepare [Hmim]HSO with a concentration of 4% from the recovered ionic liquid 4 Solution 80g, sodium chloride 20g, adjust the pH of the ionic liquid solution to 0.28, mix evenly, put it into the reactor, heat up to 80°C, and after the hydrolysis reaction for 7 hours, pass in water vapor, take out the furfural formed by the reaction to condense, and collect water Vapor condensate. The furfural yield was measured to be 2.12%.
Embodiment 3
[0040] Grind the dry wheat straw with a universal high-speed pulverizer, select particles with a particle size of 1-3cm, weigh 40g as a raw material, and add the prepared [Bmim]HSO with a concentration of 7% 4 Solution 200g, potassium chloride 50g to adjust the pH of the ionic liquid solution to 0.16, mix well and put it into the reactor, heat up to 106°C, after the hydrolysis reaction for 6 hours, pass in water vapor, take out the furfural formed by the reaction to condense, and collect water Vapor condensate. The furfural yield was measured to be 3.93%.
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