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Process for preparing furan through decarbonylation of furfural

A technology for decarbonylation to furan and furfural purification, which can be used in metal/metal oxide/metal hydroxide catalysts, organic chemistry, physical/chemical process catalysts, etc., and can solve the problems of low yield and pollution, low furan selectivity, etc. , to achieve the effect of high purity, high yield and high selectivity

Active Publication Date: 2011-02-09
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of low furan selectivity, low yield and serious pollution in the prior art, and provide a process for preparing furan by decarbonylation of furfural

Method used

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  • Process for preparing furan through decarbonylation of furfural
  • Process for preparing furan through decarbonylation of furfural
  • Process for preparing furan through decarbonylation of furfural

Examples

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Effect test

Embodiment 1

[0035] Embodiment 1: as figure 1 Shown, a kind of furfural decarbonylation furan process comprises the following steps:

[0036] A. Furfural refining: 100L crude furfural raw material is neutralized by 1% NaOH solution and then sent to furfural refining tower, where the furfural self-polymer is removed by vacuum distillation at an absolute pressure of 5KPa and 70-80°C;

[0037] B. Furfural gasification: send the refined furfural obtained in step A into the furfural intermediate tank, and send it to the vaporizer for gasification according to the molar ratio of 1:1 with hydrogen. The gasification temperature is 180°C and normal pressure;

[0038] C. Decarbonylation: send the gaseous mixture obtained in step B into a preheater to preheat to 250°C, and send the preheated gas into a decarbonylation reactor at a temperature of 250°C, and the volume space velocity of furfural liquid is 1h -1 , the catalytic decarbonylation reaction is carried out under normal pressure, and the cata...

Embodiment 2

[0042] Embodiment 2: as figure 1 Shown, a kind of furfural decarbonylation furan process comprises the following steps:

[0043] A. Furfural refining: 200L of crude furfural as raw material is neutralized by 2% KOH solution, then pumped into the furfural refining tower by a metering pump, and the furfural self-polymer is removed by vacuum distillation at an absolute pressure of 30KPa and 115-125°C;

[0044] B. Furfural gasification: send the refined furfural obtained in step A into the furfural intermediate tank, and send it to the vaporizer for gasification according to the molar ratio of 1:4 with hydrogen. The gasification temperature is 250°C and normal pressure;

[0045] C. Decarbonylation: send the gaseous mixture obtained in step B into a preheater to preheat to 350°C, and send the preheated gas into a decarbonylation reactor at a temperature of 350°C, and the volume space velocity of furfural liquid is 2h -1 , the catalytic decarbonylation reaction is carried out under...

Embodiment 3

[0049] Embodiment 3: as figure 1 Shown, a kind of furfural decarbonylation furan process comprises the following steps:

[0050] A. Furfural refining: 150L crude furfural as raw material is neutralized by 10% NaOH solution, then pumped into the furfural refining tower by metering pump, and the furfural self-polymer is removed by vacuum distillation at an absolute pressure of 15KPa and 97-107°C;

[0051] B. Furfural gasification: send the refined furfural obtained in step A into the furfural intermediate tank, and send it to the vaporizer for gasification according to the molar ratio of 1:0.5 with hydrogen. The gasification temperature is 220°C and normal pressure;

[0052] C. Decarbonylation: send the gaseous mixture obtained in step B into a preheater to preheat to 200°C, and send the preheated gas into a decarbonylation reactor at a temperature of 200°C, and the volume space velocity of furfural liquid is 0.5h -1 , under atmospheric pressure for catalytic decarbonylation re...

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Abstract

The invention discloses a process for preparing furan through decarbonylation of furfural, which comprises the following steps of: refining furfural, gasifying furfural, decarbonylating, condensing and collecting furan, recovering tail gas and refining furan. The process does not pollute the environment, and the furan has high selectivity, yield and purity.

Description

technical field [0001] The invention relates to a process for preparing furan, in particular to a process for preparing furan by decarbonylation of furfural. Background technique [0002] Furan is an important intermediate in the chemical industry. It is widely used in the synthesis of many organic compounds and pharmaceutical production. It can also be used to prepare pyrrole, thiophene, and tetrahydrofuran. [0003] In the prior art, furan production processes mainly include furoic acid decarboxylation, furfural oxidation, butadiene or crotonaldehyde catalytic oxidation and furfural decarbonylation. The furfural oxidation method has been eliminated due to low catalyst activity and high toxicity; butadiene or crotonaldehyde catalytic oxidation method is difficult to industrialize due to low reaction conversion rate and furan selectivity; furoic acid decarboxylation method is the earliest industrialized method, but the decarboxylation process uses water Large amount (5 time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/36B01J23/58
Inventor 曾健陈耀壮廖炯马磊雷菊梅赵英姚松柏
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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