Method and system for preparing furfuryl alcohol by furfural liquid phase hydrogenation

Abstract

The invention relates to a method for preparing furfuryl alcohol by taking furfural as a material through hydrogenation and a system thereof. The method disclosed in the invention includes the steps as follows: one or a plurality of complete mixing flow reactors and one or a plurality of plug-flow reactors are connected in series for combined-use; reaction materials are continuously arranged in the reactors for continuous reaction so as to obtain the furfuryl alcohol, wherein, the reaction materials include the material of furfural, a catalyst and hydrogen. The invention also relates to a system used in the method. The method of the invention has the advantages of low reaction temperature, stable operation as well as less material and energy consumption.

Description

technical field [0001] The invention relates to a method for preparing furfuryl alcohol by hydrogenating furfural, in particular to a method and a system for preparing furfuryl alcohol by hydrogenating furfural in a liquid phase. Background technique [0002] Furfuryl alcohol is an important chemical raw material. The furan resin produced by it is widely used in foundry, automobile and other industries. Furfuryl alcohol is also used in medicine, pesticides, coatings and other fields. According to domestic and foreign literature reports, the production process of furfuryl alcohol is classified from raw materials, and mainly contains the following: (1) furfural route; (2) ethanol, aluminum reduction route; (3) sodium borohydride reduction route; Classification: (1) normal pressure or low pressure (0.1-1MPa), (2) medium pressure (1-10MPa), (3) high pressure (>10MPa); classification by furfural phase: (1) liquid phase; (2) ) gas phase. [0003] At present, furfuryl alcohol ...

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Problems solved by technology

[0007] 1. The reaction between furfural and hydrogen will release a large amount of heat, which will cause the temperature of the mixture to rise. As the temperature of the material increases, the reaction speed will increase, resulting in greater heat release, and the temperature will continue to rise, and the reaction speed will be faster as the temperature rises. Such mutual promotion makes it difficult to control the reaction temperature; coupled with the uneven temperature distribution, the local temperature is prone to rise sharply instantaneously, and even violent furfuryl alcohol polymerization reaction occurs and dangerous accidents occur

poor security

[0008] 2. The reaction time between furfural and the catalyst in the reactor is short, which leads to high reaction temperature and many by-products in order to ensure the full reaction of materials

[0009] 3. Most furfural liquid-phase continuous hydrogenation reactors use plug-flow reactors. The heat released by the reaction can only be controlled by passing steam or hot water into the reactor jacket for cooling. The heat transfer area is small and the temperature control can be controlled. The tonality is poor, and the heat of reaction is not easy to move out. In addition to being prone to danger, it also leads to a small single-set production capacity of the device and is not suitable for large-scale production.

[0010] 4. The different reaction conditions of each point in the plug flow reactor in the reaction process will easily lead to uneven hydrogenation reaction. In order to ensure that the residual furfural in the product is completely reacted, some furfural will be over-reacted, resulting in poor quality of furfural alcohol semi-finished products

[0011] 5. In the traditional furfuryl alcohol production process using a plug-flow reactor, the degree of reaction can only be controlled by limited parameters such as reaction temperature, catalyst dosage, and reaction pressure. The control method is relatively single and difficult to control

[0012] 6. In the traditional furfuryl alcohol production process using a plug-flow reactor, the short residence time of furfural and catalyst in the reactor leads to high catalyst consumption, poor quality of semi-finished products, and small scale of a single set, resulting in high production cost of furfuryl alcohol

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