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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.

Inactive Publication Date: 2010-05-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In the traditional furfural production process, it is necessary to use 1 atm and 100°C water vapor to take out the generated furfural, which consumes a lot of water vapor and heat energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a method which preprocesses grass plant fiber papermaking raw materials by using a green process before a stewing link of a pulping working procedure, uses waste hemicelluloses in pulp preparation as raw materials and takes a green environment-friendly ionic liquid as a catalyst to prepare furfural, and simultaneously optimizes the utilization of resources and energy sources of the current papermaking industry, wherein the prepared furfural is a high value-added product. Solid substances processed by the method are used as high quality grass plant fiber papermaking raw materials without changing the traditional pulp technology. The invention improves the resource utilization ratio, realizes the multipurpose development of raw material components, lightens the processing difficulty of the pulping process, is favorable for lowering cost and protecting environment, simultaneously fully utilizes vapor as an effective energy source generated by stewing pulp in a paper plant, improves the utilization ratio of the energy sources, and provides a green environment-friendly economic approach for the grass plant fiber papermaking process.

Description

technical field [0001] The invention belongs to the technical field of papermaking and pulping process improvement, and in particular relates to a method of preprocessing grass plant fiber papermaking raw materials by green technology before the cooking link in the pulping process to produce furfural and then papermaking. Background technique [0002] With the development of the national economy, the demand for paper and cardboard in my country is increasing day by day, but the amount of wood that can be used in the paper industry in my country is far from meeting the needs of the development of the paper industry. However, my country has sufficient grass fiber resources, and has accumulated rich experience in grass fiber pulping and papermaking for a long time. Practice and further research show that grass fiber raw materials will continue to play a pivotal role in China's paper industry. Wheat straw, straw, reed, etc. are common grass plant fiber papermaking raw materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C1/04C07D307/50
CPCY02P20/584
Inventor 宋航姚舜涂斌李新莹贾春梅
Owner SICHUAN UNIV
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