Single-bed two-stage furfural, paper pulp and lignin polygeneration system and method capable of achieving continuous operation

A technology of lignin and polygeneration, applied in separation methods, chemical instruments and methods, papermaking, etc., can solve the problems of poor economy and market flexibility, single process products, large solid waste discharge, etc., to achieve promotion The effect of intricate distribution, increasing furfural yield, and avoiding secondary reactions

Pending Publication Date: 2018-12-28
BEIJING UNIV OF CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of single product, large solid waste discharge, serious pollution, poor economy and market flexibility in the traditional furfural preparation process. Optimization, simultaneous preparation and separation of furfural, pulp and lignin in one reactor, and development of a multi-product co-production, high-efficiency and energy-saving process device to simultaneously produce furfural, pulp and lignin

Method used

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  • Single-bed two-stage furfural, paper pulp and lignin polygeneration system and method capable of achieving continuous operation
  • Single-bed two-stage furfural, paper pulp and lignin polygeneration system and method capable of achieving continuous operation

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Embodiment 1

[0024] (Example 1, see figure 1 )

[0025] This embodiment comprises a raw material feeding unit 13, a dipping tank 16, a catalyst solvent feeding unit 7, a pressurized reactor 1, a steam inlet unit, a furfural rectifying unit 9, a liquid-solid product unloading unit, a washing unit 19, Pulp collection unit and lignin extraction unit 23. The pressurized reactor 1 adopts a single-bed two-stage structure, including the stripping section 2 of the reactor with a small cross-sectional area on the upper side and the mixed cooking section 3 of the reactor with a larger cross-sectional area on the lower side to increase the gas velocity of the stripping section 2 and quickly remove the generated furfural to avoid secondary reactions to increase the yield of furfural; corn cob, FeCl 3 (60mmol / L), the mixture of acetic acid (5wt%) is mixed in dipping tank 16 to carry out pretreatment to raw material, thereby improves the processing effect and efficiency of reactor, reduces the residen...

Embodiment 2

[0026] (Example 2, see figure 1 )

[0027] The difference between this embodiment and embodiment 1 is: sawdust, Al 2 (SO 4 ) 3 The mixture of acetic acid and acetic acid is mixed in the dipping tank 16 to pretreat the raw materials, thereby improving the treatment effect and efficiency of the reactor, reducing the residence time of the material in the reactor, and improving the yield of furfural and pulp; the pre-mixed material enters the reactor Mixed cooking stage 3, mixed with water vapor and in Al 2 (SO 4 ) 3 Various reactions take place under the catalysis of acetic acid; Other system composition is identical with embodiment 1.

Embodiment 3

[0028] (Example 3, see figure 2 )

[0029] The difference between this embodiment and embodiment 1 is: wheat straw, FeCl 3 The mixture of acetic acid and isopropyl acetate is mixed in the dipping tank 16 to pretreat the raw materials, thereby improving the treatment effect and efficiency of the reactor, reducing the residence time of the material in the reactor, and improving the yield of furfural and pulp; premixing The material enters the mixing and cooking section 3 of the reactor, and is mixed with steam and heated in FeCl 3 Various reactions take place under the catalysis of acetic acid; the gas discharged from the outlet pipe 8 of the reactor enters the furfural rectification unit 9 to obtain furfural products, and the yield of furfural is greater than 70%. The acetic acid and isopropyl acetate are collected and returned to the catalyst solvent The feeding unit and the dipping tank are recycled; part of the liquid discharged from the lignin extraction unit is returned...

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Abstract

The invention relates to a single-bed two-stage furfural, paper pulp and lignin polygeneration system and method capable of continuous operation. The method comprises the steps that raw materials, vapor, a catalyst and a solvent are mixed and boiled in a pressurized reaction kettle, through improvement on the structure of a reactor and parameter optimization, furfural, paper pulp and lignin are prepared at the same time, and continuous operation is achieved; duo to use of a cyclone separator in the pressurized reaction kettle, internal circulation of a mixing boiling section and a stripping section, a plurality of vapor distributors and a plurality of system circulations, the mixing effect of the reaction kettle is improved, the heat and mass transfer rate and the reaction rate are improved, material entrainment at a gas outlet of the stripping section is reduced, and the furfural yield and the technical and economical efficiencies of the system are improved; through sufficient mixingof gas, liquid and solid in the reaction kettle and quick separation of the gas from the solid, improvement of the yield of the paper pulp and improvement of the yield of the lignin are facilitated, and accordingly, optimized combination of the technical and economical efficiencies of the system is achieved.

Description

technical field [0001] The invention relates to a process system and method for preparing furfural and co-producing it with pulp and lignin. Background technique [0002] Furfural, also known as 2-furyl formaldehyde, is the most important derivative of the furan ring system. It is chemically active and can produce numerous derivatives through oxidation and condensation reactions. It is widely used in medicine, plastics, pesticides, oil refining, and organic synthesis. And the field of preparation of non-petroleum polymers. There are many kinds of synthesis methods. The synthesis process is divided into one-step method and two-step method: the one-step method is to hydrolyze pentosan and dehydrate pentose to form furfural in the same hydrolysis reactor. The one-step method requires less investment in equipment and is easy to operate. It has been widely used in the furfural industry, but the one-step method consumes a lot of steam, the yield of furfural is low, and produces a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/04B01D45/16B01D3/14B01D3/06B01D3/32C07D307/48C08H7/00D21B1/02
CPCB01D3/06B01D3/14B01D3/32B01D45/16B01J3/04D21B1/021C07D307/48C08H6/00
Inventor 代建军康秦豪汪春雷冉春梅刘洋张贺东高作鹏敖文雅毛笑付洁
Owner BEIJING UNIV OF CHEM TECH
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