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Method for preparing furfural by one-step selective catalytic cracking

A catalytic cracking and selective technology, applied in chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve the problems of complex systems and low furfural content, and achieve simple operation, high furfural content, The effect of high utilization

Active Publication Date: 2015-06-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that rapid pyrolysis of biomass can obtain liquid phase products containing furans, etc., but the system contained in this liquid phase is very complex (up to hundreds of substances), and the content of furfural is very low (<5%)

Method used

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  • Method for preparing furfural by one-step selective catalytic cracking

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Experimental program
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Effect test

preparation example Construction

[0023] Preparation of furfural:

[0024] (1) Dry the bagasse at 100-110° C. for 12 hours; the biomass raw material selected in the present invention is the bagasse left after sugar extraction in Quanzhou Sugar Factory, Fujian.

[0025] (2) Break the bagasse into about 150 mesh powder on the crusher;

[0026] (3) Weigh the catalyst and bagasse according to the weight ratio, and then mix the two evenly;

[0027] (4) Fill the mixture into the middle of a quartz tube with an inner diameter of 20 mm, and build a packed bed reactor, such as figure 1 shown;

[0028] (5) Before the start of the experiment, pass nitrogen gas for air tightness test. The nitrogen flow rate is 40ml / min. After the air tightness is good, continue to pass nitrogen gas for 3 to 5 minutes to discharge the air inside the reaction tube;

[0029] (6) Rapidly heat the reaction tube to 500-550°C at a heating rate of 50-80°C / min, and stay there for 5-10 minutes. The liquid phase product is collected after cooling...

Embodiment 1

[0032] Weigh 6g of catalyst and 3g of bagasse, fill them into the reaction tube, and first pass nitrogen gas to check the air tightness. After the air tightness is good, wait for about 3 minutes, and then perform the rapid cracking experiment at a heating rate of 50°C / min. The final reaction temperature is 500°C, and stay at 500°C for 5 minutes. Then the nitrogen gas was turned off, and the reaction tube was naturally cooled to room temperature. About 1.5 g of the liquid phase product was collected by cooling in an ice-water bath, and its composition was analyzed by gas chromatography, wherein the furfural content was 15.9 wt%.

Embodiment 2

[0034] Weigh 5g of catalyst and 5g of bagasse, fill them into the reaction tube, and pass nitrogen gas to check the airtightness. After the air tightness is good, wait for about 3 minutes, and then perform the rapid cracking experiment at a heating rate of 50°C / min. The final reaction temperature is 500°C, and stay at 500°C for 5 minutes. Then the nitrogen gas was turned off, and the reaction tube was naturally cooled to room temperature. About 2.5 g of the liquid phase product was collected by cooling in an ice-water bath, and its composition was analyzed by gas chromatography, wherein the furfural content was 27.5 wt%.

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Abstract

The invention provides a method for preparing furfural by one-step selective catalytic cracking. The method comprises the following steps of: reacting at 500 DEG C-550 DEG C in a nitrogen gas atmosphere by using bagasse as the material, using an HZSM-5 molecular sieve with ZnCl2 loading capacity of 10wt%-30wt% as the catalyst; and collecting the reaction product after cooling the reaction product by icy-water bath to obtain a liquid-phase production containing furfural. The method for preparing the furfural by one-step selective catalytic cracking has the beneficial effects that firstly, a B acid system is not adopted for hydrolyzing, so that the device corrosion is greatly lowered, the device investment is reduced and the operation is simpler; secondly, compared with documentary data, high furfural yield is obtained and the material utilization rate is higher; and thirdly, in addition to the main product furfural, various chemical base materials or by-products with a high additional value are obtained, so that the method disclosed by the invention has a better market application value.

Description

(1) Technical field [0001] The invention relates to a method for preparing furfural by one-step selective catalytic cracking. (2) Background technology [0002] As an important chemical intermediate, furfural has a wide range of uses: ① It is the raw material for the production of furfuryl alcohol, which is the main raw material for the production of furan resin; ② It is the raw material for the preparation of various pharmaceuticals and industrial products; ③ It can be used to prepare succinaldehyde, which is Raw material for the production of drug atropine; ④ used as a solvent; ⑤ can replace formaldehyde and phenol condensation, manufacture phenolic resin and so on. Biomass, as an alternative energy source, will play an incomparable role as fossil energy sources decrease day by day. The main components of biomass are cellulose, hemicellulose and lignin. Since furfural is a platform compound of biomass, it can be obtained through the dehydration reaction of cellulose and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/50B01J29/40
Inventor 王建国冷帅
Owner ZHEJIANG UNIV OF TECH