Method for dehydrating furfural by pervaporation of NaA zeolite molecular sieve membrane

Abstract

The invention discloses a method for dehydrating furfural by the pervaporation of a NaA zeolite molecular sieve membrane, which belongs to the technical field of chemical engineering and relates to the preparation of a high-performance NaA molecular sieve membrane on the outside surface of a porous carrier and the use of the NaA molecular sieve membrane in furfural dehydration. The method is characterized in that: the NaA molecular sieve membrane is prepared from Na2O, SiO2, Al2O3 and H2O in a molar ratio of 1.2-2.0:2:1:100-200; the carrier coated with seed crystals is placed in a high-pressure reaction kettle, synthesizing liquid is filled into the reaction kettle, the reaction kettle is sealed and then placed in an environment where the temperature is 50 to 100 DEG C to perform synthesis for 2 to 24 hours, the NaA molecular sieve membrane prepared is soaked in deionized water till the NaA molecular sieve membrane is neutral, and the NaA molecular sieve membrane is placed in an oven at 50 to 100 DEG C to be dried; and with the adopted process for dehydrating the furfural by the pervaporation of the NaA zeolite molecular sieve membrane, the water / furfural separation factor of the NaA zeolite molecular sieve membrane is more than10,000, the furfural content reaches over 99.5 weight percent, and the separation effect reaches an international advanced level. The invention has the advantage of providing a separation technique for dehydrating furfural, which is effective, environmentally-friendly and economic and has a high industrial application value and a practical significance.

Description

technical field

[0001] The invention belongs to the technical field of chemical engineering and relates to the preparation of NaA zeolite molecular sieve membranes, in particular to a method for removing water from furfural by permeation evaporation through NaA zeolite molecular sieve membranes. Background technique

[0002] Furfural (scientific name furan formaldehyde) is an important organic chemical raw material that cannot be synthesized by petrochemical raw materials so far but can only be produced by agricultural and forestry plant fiber waste. slag, wood chips, etc.) as raw materials, hydrolyzed, dehydrated, and refined by distillation. It is a colorless or light yellow liquid with an odor similar to almond oil. The melting point is -38.7°C and the boiling point is 161.7°C. Slightly soluble in water at room temperature, miscible with alcohol, acetone, ether, benzene, etc. Due to the existence of functional groups such as carbonyl, diene, and cyclic ether in the molec...

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