Method for preparing furfural by utilizing cotton stalk

A cotton stalk and furfural technology is applied in the field of producing furfural by using cotton stalks, which can solve the problems of inability to fully contact cotton stalk raw materials for slag discharge, inability to mix acid with dilute acid solution, and difficult to break cotton stalks, thereby shortening the hydrolysis reaction time. , Guarantee the quality of furfural and the effect of complete crushing

Inactive Publication Date: 2006-07-19
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for producing furfural by using cotton stalks, so as to solve the problem that cotton stalks cannot be mixed with acid because the cotton stalks are difficult to break, and after acid mixing, the dilute acid solution cannot fully contact with the cotton stalk raw materials and slag discharge caused by using cotton stalks alone Difficulty, high steam consumption, high production cost

Method used

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  • Method for preparing furfural by utilizing cotton stalk

Examples

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Comparison scheme
Effect test

Embodiment 1

[0016] The raw material is cotton stalks air-dried in spring, and its water content is 22.5%. The cotton stalks are first cut into 4cm long segments with a grass cutter, and dust is removed with a three-roller dust collector during the cutting process. The cut cotton stalks are sent to the cutting and crushing equipment for further cutting and crushing of cotton stalk particles with a final length of about 1-1.5cm. Corncob particles, corncob particles and cotton stalk particles are fully mixed according to the mass ratio of 0.5 to 1:1 in the process of conveying to the bucket elevator, and then transported by the elevator to the acid mixing truck for acid mixing. The catalyst is sulfuric acid. The acid concentration is 5-10%, the amount of acid used is kept at a specific ratio of liquid to solid, and it is sent to the hydrolysis kettle through a belt conveyor. The volume of the hydrolysis kettle is 10 cubic meters, and the double kettles are operated in series. At 160~240kg / m...

Embodiment 2

[0018] The raw material is corncobs air-dried in spring, and its water content is 27%. After the corncob is dedusted by a vibrating screen, it is crushed into 1-1.5cm corncob particles by a hammer mill, and then transported by the elevator to the acid mixing truck for acid mixing. The acid concentration is 5-10%, and the amount of acid used is kept at With a specific solid-to-liquid ratio, it is sent to the hydrolysis kettle through a belt conveyor. The volume of the hydrolysis kettle is 10 cubic meters. It is operated in series with two kettles. The packing density of corncobs is 160-240kg / m 3 , After filling the hydrolysis kettle, feed water vapor with a pressure of 0.45-0.75MPa, the hydrolysis temperature is 145-180°C, and the hydrolysis takes 2 hours, 45 minutes to 5 hours. The furfural stock solution obtained by hydrolysis is introduced into the subsequent process, and the gross aldehyde is extracted, and the furfural is continuously refined to obtain commercial furfural....

Embodiment 3

[0020] The raw materials used in this example, equipment and operation flow are identical with embodiment 1. The technological condition is changed to: the mass ratio of cotton stalk and corncob is 0.4:1. This example furfural yield is 8~8.5%. The quality has also reached the national premium product index. The quality inspection indicators are shown in Table 1, and the consumption details are shown in Table 2.

[0021] Table 1: Comparison list of the results of furfural quality inspection in the examples and the indicators specified in GB 1926.1-88

[0022]

[0023]

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Abstract

The preparation method for furfural with cotton stalk comprises: cutting the cotton stalk into small bars of 2-5cm; further crushing and rolling to obtain the cotton stalk particles of 1-3cm as well as the corn core particle of 1-1.5cm; mixing the cotton stalk and corn core to stir with acid by great liquid and solid ratio in machine; then, loading into the hydrolysis kettle with filling density as 160-240kg/m3; leading vapor into the kettle, keeping the hydrolysis temperature as 145-180Deg for 2-5h as the hydrolysis period; leading the furfural primary liquid into post-process to extract, refine and obtain the final product. This invention improves yield, ensures product quality, and benefit to environmental protection.

Description

technical field [0001] The invention relates to the field of furfural preparation, in particular to a method for preparing furfural from cotton stalks. Background technique [0002] Furfural is an organic chemical product that has not been synthesized from chemical raw materials but can only be extracted from plant materials such as agricultural waste. Furfural is an excellent selective solvent and a raw material for the production of various furan compounds. It is widely used in foundry binder, tetrahydrofuran, lubricating oil refining, organic synthesis, plastics, medicine, chemical anticorrosion, etc. Furfural has long been industrialized and mass-produced in the world. There are many production methods, but all of them adopt the direct method. The direct method is to put the raw material containing polypentose into a hydrolysis kettle, and under the action of catalyst—sulfuric acid and heat, the polypentose is hydrolyzed into pentose, and at the same time, the pentose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48C07D307/50
Inventor 焦丽江成真赵新华高绍丰
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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