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Preparation technology of furfural

A furfural and process technology, applied in the field of furfural preparation process, to achieve the effects of saving volume, eliminating excessive reaction, and enhancing microscopic mixing effect

Inactive Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the deficiencies of the prior art, the present invention provides a furfural preparation process, especially a new method for efficiently producing furfural and recovering the by-products formic acid and acetic acid at the same time, and a liquid-liquid mixing impingement flow reaction that is especially suitable for the process It achieves fluid mixing through multiple impacts, and has a good microscopic mixing effect. The mixed liquid flows in parallel outside the impact area, providing sufficient residence time for the material, realizing a cascade reaction, and through the design of the flow channel and liquid flow rate Achieve the target conversion rate, overcome the shortcomings of current impingement flow reactors that cannot achieve high conversion rate through a single reactor

Method used

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  • Preparation technology of furfural
  • Preparation technology of furfural

Examples

Experimental program
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Effect test

Embodiment 1

[0053] The crushed corn stalks and water were injected into the hydrolysis tank according to the mass ratio of 1:1. The pre-hydrolysis temperature was 160°C and the pre-hydrolysis time was 30 min. The mass concentrations of pentose, acetic acid and formic acid in the pentose solution obtained after the reaction were 5.2% and 2.5% respectively. , 0.7%.

[0054] The composite extractant used is dimethyl phthalate, n-octanol, ethyl triphenylphosphine hexafluorophosphate mixed solvent, wherein, dimethyl phthalate accounts for 40wt%, n-octanol accounts for 20wt%, Ethyl triphenylphosphine hexafluorophosphate accounts for 40wt%.

[0055] The feed ratio of extractant and pentose solution is 3:1 (volume ratio), and the feed rate of extractant and pentose solution is equal to the impinging flow reactor volume (that is, the feed volume space velocity is 1h -1 , that is, the reaction time is 1h), and the circulating material rate is 200% of the feed amount. Control the reaction temperat...

Embodiment 2

[0058] According to the method of Example 1, the difference is that the feed rate is twice the volume of the impinging flow reactor, that is, the reaction time is 0.5 h.

[0059] The experimental results showed that the conversion rate of pentose sugar was 77wt%, the yield of furfural was 60.9wt%, the recovery rate of acetic acid was 94.1wt%, and the recovery rate of formic acid was 90.7wt%.

Embodiment 3

[0061] According to the method of Example 1, the difference is that the feed rate is 0.67 times the volume of the impinging flow reactor, that is, the reaction time is 1.5 h.

[0062] The experimental results showed that the conversion rate of pentose sugar was 99%, the yield of furfural was 82.4%, the recovery rate of acetic acid was 94.1%, and the recovery rate of formic acid was 90.7%.

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Abstract

The invention discloses a novel technology for efficiently producing furfural and simultaneously recycling by-products including methanoic acid and acetic acid. An impinging stream reactor which is especially suitable for the technology is adopted, fluid mixing is achieved through multiple times of impinging, a good micromixing effect is achieved, mixed liquid flows outside an impinging area in a plug-flow mode, sufficient staying time is provided for materials, cascaded reacting is achieved, and the target conversion rate is achieved through flow channel and liquid flow rate design. According to the technology, the defect that an existing impinging stream reactor cannot achieve the high conversion rate through a single reactor is overcome, the technology procedures are simplified, production cost and equipment investment are reduced, and long-period running of equipment is guaranteed; no waste liquid is drained in the production process, and a green and environment-friendly technology method is achieved.

Description

technical field [0001] The invention relates to a furfural preparation process, in particular to a process for producing furfural by using a high-efficiency mixing reactor and simultaneously producing formic acid and acetic acid by-products. Background technique [0002] Furfural, also known as furfural. Due to the existence of functional groups such as aldehyde groups, dienes, and cyclic ethers in the molecular structure of furfural, it has the properties of aldehydes, ethers, dienes, and aromatic compounds, and can participate in many different types of reactions and synthesize a variety of chemical products. It is used in food, medicine, synthetic resin, casting and many other production fields. [0003] Currently, furfural is produced from plant fibers rich in pentosan, such as corn cobs, bagasse, corn stalks, and rice husks. The principle is that pentosan is firstly hydrolyzed into pentose, and then the pentose is dehydrated and cyclized to furfural. [0004] Accordi...

Claims

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Application Information

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IPC IPC(8): C07D307/50C07C51/00C07C53/02C07C53/08B01J14/00B01J19/24
CPCC07D307/50B01J14/00B01J19/248C07C51/00C07C53/02C07C53/08
Inventor 薄德臣孟凡忠张英高明张伟
Owner CHINA PETROLEUM & CHEM CORP
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