Catalyst based on silicalite-1 molecular sieve and method for preparing 1,2-pentanediol by using the same

Abstract

The invention provides a silicalite-1 molecular sieve encapsulating metal nanoparticle catalyst with organic base functionalization and a preparation method thereof, and a method for preparing 1,2-pentanediol by hydrogenolysis of biomass derivative furfuryl alcohol by using the catalyst. When the catalyst is used in a reaction for preparing the 1,2-pentanediol by the hydrogenolysis of the furfurylalcohol, the catalyst is high in hydrogenolysis activity under mild reaction conditions, enables the conversion rate of the furfuryl alcohol and the selectivity of the 1,2-pentanediol in the reactionto be significantly improved, simultaneously does not produce obvious furfuryl alcohol polymers as by-products, is good in stability and long in life, can be recycled and reused by simple filtrationafter the reaction is completed, and enables the reaction cost and the separation difficulty to be greatly reduced.

Description

technical field [0001] The present invention relates to a catalyst. In particular, it relates to a catalyst based on silicalite-1 molecular sieves. The invention also relates to a method for preparing 1,2-pentanediol using the catalyst and using furfuryl alcohol as a raw material. Background technique [0002] 1,2-pentanediol is a special dihydric primary alcohol, which is widely used in many fields. For example, it is mainly used in the synthesis of the pesticide propiconazole (a fungicide with high efficiency, low toxicity and broad spectrum of activity). In addition, 1,2-pentanediol has obvious polarity and non-polarity, and can be used in cosmetics or personal care products to play an excellent moisturizing effect, especially, 1,2-pentanediol also has antibacterial and antiseptic effects , so it can be used to formulate products without added preservatives. [0003] The traditional preparation method of 1,2-pentanediol is to obtain n-pentene through epoxidation and r...

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Problems solved by technology

[0012] Patent document CN104370702 discloses a method for preparing 1,2-pentanediol by liquid-phase selective hydrogenolysis, using Cu-B / SiO 2 Catalyst, hydrogenation reaction at 170°C and 8MPa (pressure at room temperature) for 8 hours, the highest 1,2-pentanediol selectivity of 41.4% can be obtained, and the conversion rate of furfural is 87.8%, but the polymerization of residual furfural leads to catalyst deactivation

[0013] In summary, since furfural and furfuryl alcohol are easily polymerized (resinized) in a high temperature environment, the catalyst is deactivated quickly in the existing method, and the product yield decreases

In addition, although the addition of inorganic base KOH or NaOH can reduce the polymerization side reaction, it also inhibits the hydrogenolysis process, resulting in 1,2-pentanediol selectivity will not be too high, more by-products (such as tetrahydrofurfuryl alcohol) , the follow-up separation is difficult, and the alkali cannot be reused

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