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Method for improving furfural yield by furfural steam gas phase neutralization

A technology of aldehyde yield and gas phase, applied in the field of biomass energy chemical industry, can solve the problems of waste water discharge polluting the environment, low furfural yield, and high energy consumption of rectification, and achieve energy saving, energy consumption reduction, and purity and concentration improvement. Effect

Active Publication Date: 2017-10-10
JILIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method of using nitrogen as a stripping medium, dehydrating xylose to produce aldehyde vapor, and neutralizing the aldehyde vapor in the gas phase to increase the yield of furfural, which is used to solve the problem of furfural yield in traditional furfural preparation methods. Low efficiency, high acidity of aldehyde solution, high rectification energy consumption, and technical problems of wastewater discharge polluting the environment

Method used

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  • Method for improving furfural yield by furfural steam gas phase neutralization

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Embodiment 1

[0037] Step 1, according to figure 1 In the process shown, first add 2mol / L sulfuric acid catalyst solution into the dehydration reactor 1, and pass nitrogen gas at 150°C to 200°C at the bottom of the dehydration reactor 1, heat the catalyst solution to reflux, and then add a cocatalyst to chlorinate Sodium, the quality of sodium chloride is 25% of sulfuric acid solution quality, stirs to form a rotating liquid level with fixed catalyst concentration, and this nitrogen is heated through nitrogen heater 7.

[0038] Step 2. Add the 10wt% xylose solution obtained by hydrolysis of hemicellulose dropwise into the reactor at 2ml / min to 5ml / min, heat the reaction at a constant temperature with nitrogen, carry out dehydration reaction of xylose on the liquid surface layer, and generate furfural vapor Escape together with nitrogen.

[0039] Step 3: Add 5 wt% sodium sulfate solution as a neutralizing agent into the neutralization reactor 4, and set the temperature of the neutralization...

Embodiment 2

[0043] Embodiment 2: the concentration of changing sodium sulfate solution is respectively 10wt%, 15wt%, 20wt%, other conditions are identical with embodiment 1, and the furfural liquid acidity that obtains is respectively 4.0 * 10 -4 mol / L, 3.9×10 -4 mol / L, 4.8×10 -4 mol / L, furfural yields were 73.9%, 74.0%, 74.4%, and the pH values ​​of neutralizers were 0.58, 0.62, 0.54.

[0044] Depend on figure 2 Known, the yield of furfural after the neutralization of inorganic salt solution is obviously higher than the furfural yield of neutralization in water, and after neutralization in water, the content of furfural in the neutralization liquid is 7% (accounting for the percentage of theoretical furfural mass), sodium sulfate neutralization The furfural content in the liquid is very little about 0.01%, which shows that some furfural is dissolved after the aldehyde vapor enters the aqueous solution.

[0045] According to the electrostatic field theory, there is an electric field a...

Embodiment 3

[0046] Embodiment 3: adopt sodium chloride solution as neutralizing agent, other conditions are identical with embodiment 1, and the furfural liquid acidity that obtains is 2.2 * 10 -4 mol / L, the furfural yield is 70.7%, and the pH value of the neutralizer is 0.77.

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Abstract

The invention relates to a method for improving furfural yield by furfural steam gas phase neutralization. The method particularly includes the steps: firstly, dehydrating xylose by taking nitrogen as a steam stripping medium to prepare furfural steam; secondly, adding neutralizer solution prepared in advance into a neutralization reactor; thirdly, leading acid furfural steam distilled off from a dehydration reactor into a gas dispersing device at the bottom of the neutralization reactor, and performing reaction in the reactor after dispersion; leading furfural solution into a rectifying tower to obtain furfural with the purity of 99% or more. After the acid furfural steam passes the neutralizer solution, acid gas is absorbed by the neutralizer solution, and obtained acid solution can be returned into the dehydration reactor to serve as a catalyst for preparing the furfural after acidity is adjusted. The method has the advantages that the nitrogen is used for steam stripping, consumption of water vapor is reduced, the concentration and the purity of the furfural are improved, the acidity of the furfural steam is reduced by a gas phase neutralization method, corrosion of equipment is prevented, energy consumption of a rectifying section can be reduced, and continuous production of the furfural can be realized.

Description

technical field [0001] The invention belongs to the technical field of biomass energy chemical industry, and in particular relates to a method for neutralizing aldehyde vapor in gas phase to increase furfural yield. Background technique [0002] As an important organic chemical raw material and chemical solvent, furfural is widely used in petroleum industry, chemical industry, medicine, food, synthetic rubber, synthetic resin and other industries. The main disadvantages of one-step production of furfural are high energy consumption, low yield of furfural, and a large amount of waste liquid and waste residues; while the two-step process can increase the yield of furfural and avoid damage to cellulose and lignin in the furfural production process. Partial destruction, the raw materials can be comprehensively utilized through follow-up development, thereby reducing environmental pollution. Therefore, the two-step method is an inevitable choice for the furfural industry. [000...

Claims

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Application Information

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IPC IPC(8): C07D307/48
CPCC07D307/48
Inventor 王子忱隋光辉程岩岩王晓峰
Owner JILIN UNIV
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