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A process for continuous production of furfural from xylose

A technology of xylose and furfural, which is applied in the field of continuous production of furfural from xylose, can solve the problems of economic efficiency limitation and achieve the effect of suppressing the loss of furfural

Inactive Publication Date: 2018-08-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the catalyst system in the prior art continuous liquid phase process has great limitations in ensuring the economic efficiency of the process

Method used

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  • A process for continuous production of furfural from xylose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add H to 10wt% xylose solution 2 SO 4 , prepared into 5-10wt% dilute sulfuric acid-xylose solution, and then add extractant NaCl to saturation.

[0047] Use HZSM-5 molecular sieve catalyst (Si / Al=25) to load on the inner wall of porous ceramics (cordierite material, 100 mesh) to make solid acid with filling molding treatment. The solid acid filler is stacked inside the packed bed reaction tube, such as figure 1 Support catalyst packing 6 positions. Use wire mesh packing to place in the upper part of the packed bed reactor, such as figure 1 Defoaming filler 4 positions. Metal powder sintered plates with a pore size of 5 microns are used as dispersed carrier gas fillers, and the lower part of the reactor, such as figure 1 Disperse the carrier gas packing in 7 positions. Porous ceramics (cordierite material, 400 mesh) are directly used as extractant dispersion filler, placed at the bottom of the reactor, such as figure 1 Disperse organic solvent filler 8 positions. ...

Embodiment 2

[0050] Add acetic acid to 10wt% xylose solution to prepare 5wt% dilute acetic acid-xylose solution.

[0051] The faujasite molecular sieve catalyst is used to support the inner wall of porous ceramics (cordierite material, 100 mesh) to make a solid acid with filling molding treatment. The solid acid filler is stacked inside the packed bed reaction tube, such as figure 1 Support catalyst packing 6 positions. Use wire mesh packing to place in the upper part of the packed bed reactor, such as figure 1 Defoaming filler 4 position position. Metal powder sintered plates with a pore size of 5 microns are used as dispersed carrier gas fillers, and the lower part of the reactor, such as figure 1 Disperse the carrier gas packing in 7 positions. Porous ceramics (cordierite material, 400 mesh) are directly used as extractant dispersion fillers and placed at the bottom of the reactor, as shown in figure 8 for dispersion of organic solvent fillers.

[0052] The prepared xylose mother l...

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Abstract

The invention provides a process for continuous production of furfural from xylose. The process includes the following steps: pretreating mother liquor containing the xylose, injecting the mother liquor into a reactor after the dispersing and atomization of the mother liquor in the upper part of a packed bed reactor, bringing the mother liquor into contact with a heat-carrying gas stream fed fromthe lower part of the reactor, carrying out the generated furfural from the reaction system by a gas stream, and extracting and separating the furfural in a base solution at the same time by the an extractant. The temperature of a xylose dehydrated reaction in the packed bed is 150-280 DEG C, and the residence time of the xylose solution in the reactor is 0.01-100 minutes. Conversion of the xyloseinto the furfural in a liquid phase reaction system, and furfural stripping separation and extraction separation are synchronously achieved in a multi-layer packed bed reactor so as to reduce steam consumption in the whole process, to reduce production of wastewater, and more importantly, to shorten the residence time of the furfural product in the liquid phase reaction system to reduce side reactions causing loss of furfural.

Description

technical field [0001] The invention belongs to the technical field of energy, and in particular relates to a process for continuously producing furfural from xylose. Background technique [0002] Furfural production has experienced a variety of equipment and processes in history. Divided from the process itself, it can be divided into "one-step method" and "two-step method". At present, almost all industrial production adopts "one-step method". The so-called one-step method refers to mixing the lignocellulosic raw material rich in pentosan with an appropriate amount of catalyst, placing it in a hydrolysis reactor, and continuously feeding saturated water vapor at the bottom of the hydrolysis reactor (usually requiring a temperature> 160°C), At this time, the hydrolysis of the pentosan in the raw material and the dehydration of the pentose to generate furfural are carried out in the same hydrolysis pot. The process is a continuous process of the batch process of the Qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48
CPCC07D307/48
Inventor 张宗超毛燎原李延鑫石振
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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