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Method for preparing furfural from xylose through dehydration via gas-liquid two-phase flow

A technology of flowing xylose and furfural, applied in the field of synchronous separation from the reaction system, can solve the problems of furfural yield, economic efficiency, environmental restrictions, etc., achieve high economic efficiency and environmental benefits, continuous input, and suppress the effect of side reaction loss

Inactive Publication Date: 2017-12-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] According to the research on the related technologies of furfural production in the past, the existing continuous production of furfural from xylose has great limitations in terms of furfural yield, economic efficiency and environment.

Method used

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  • Method for preparing furfural from xylose through dehydration via gas-liquid two-phase flow
  • Method for preparing furfural from xylose through dehydration via gas-liquid two-phase flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) The HZSM-5 molecular sieve is loaded on the inner wall of the honeycomb ceramics, and placed in the I zone 9 of the packed bed reactor and the II zone 10 of the packed bed reactor. Configuration concentration is the xylose mother liquor of 10wt%, and adds H 2 SO 4 , such that its H 2 SO 4 The concentration is 5wt%, and at the same time, a certain amount of NaCl is added to make the concentration 10wt%.

[0046] (2) The xylose mother liquor 1 prepared in step (1) is continuously pumped into the first heat exchanger 7 by a plunger pump, and is exchanged with saturated steam, and the xylose mother liquor 1 is heated to 80° C. Then the mother liquor continues to enter the second heat exchanger 8, and the xylose mother liquor 1 is heated to 180°C.

[0047] (3) The xylose mother liquor from the second heat exchanger 8 enters the packed bed reactor I zone 9, and is directly mixed with the saturated steam 5 at 230° C., the xylose mother liquor is heated to 200° C., and ...

Embodiment 2

[0052] (1) The mordenite molecular sieve is loaded on the inner wall of the honeycomb ceramics, and placed in the I zone 9 of the packed bed reactor and the II zone 10 of the packed bed reactor. Configuration concentration is the xylose mother liquor of 15wt%, and adds acetic acid, makes its acetic acid concentration be 5wt%, adds a certain amount of ZnCl simultaneously 2 , so that its concentration is 10wt%.

[0053] (2) The xylose mother liquor 1 prepared in step (1) is continuously pumped into the first heat exchanger 7 by a plunger pump, and is exchanged with saturated steam, and the xylose mother liquor 1 is heated to 80° C. Then the mother liquor continues to enter the second heat exchanger 8, and the xylose mother liquor is heated to 180°C.

[0054] (3) The xylose mother liquor from the second heat exchanger 8 enters the packed bed reactor I zone 9, and is directly mixed with the saturated steam 5 at 230° C., the xylose mother liquor is heated to 220° C., and part of t...

Embodiment 3

[0058] (1) Mordenite molecular sieve and ZnCl 2 After being mixed at a mass ratio of 1:1, it is loaded on the inner wall of the honeycomb ceramics and placed in zone 9 of the packed bed reactor and zone 10 of the packed bed reactor II. Configuration concentration is the xylose mother liquor of 15wt%, and adds acetic acid, makes its acetic acid concentration be 5wt%, adds a certain amount of CaCl simultaneously 2 , so that its concentration is 10wt%.

[0059] (2) The xylose mother liquor prepared in step (1) is continuously pumped into the first heat exchanger 7 by a plunger pump to exchange heat with saturated steam, and the xylose mother liquor 1 is heated to 80° C. Then the mother liquor continues to enter the second heat exchanger 8, and the xylose mother liquor 1 is heated to 180°C.

[0060] (3) The xylose mother liquor from the second heat exchanger 8 enters the packed bed reactor I zone 9, and is directly mixed with 230°C saturated steam, the xylose mother liquor is he...

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Abstract

The objective of the invention is to provide a method for continuous preparing furfural from xylose. According to the method, a solution containing xylose or xylooligosaccharide is allowed to contact with high-temperature gas-phase flow; and furfural is produced in the process of contact of gas-liquid two-phase flow, is extracted from a liquid phase through stripping via gas flow and then enters gas-phase flow. The method provided by the invention has the advantage that conversion of furfural from xylose and separation of furfural are synchronously carried out; rapid heat transfer and mass transfer enable the selectivity of furfural converted from xylose to be improved; and the yield of furfural is allowed to reach 80% or above of a theoretical conversion rate.

Description

technical field [0001] The invention belongs to the field of energy technology, and in particular relates to a method for converting xylose into furfural and synchronously separating it from a reaction system. Background technique [0002] Furfural production can be divided into "one-step method" and "two-step method" according to the process itself. At present, almost all industrial production adopts "one-step method", and "two-step method" is in the stage of small test or pilot test. Reports on industrial operation. The so-called "one step" 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 p...

Claims

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Application Information

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IPC IPC(8): C07D307/48
CPCC07D307/48
Inventor 张宗超毛燎原刘秀梅李延鑫
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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