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

A zeolite molecular sieve membrane and pervaporation technology, applied in the field of chemical engineering, can solve the problem of separation without research reports, and achieve the effects of expanding the application field, improving the grade, and reducing energy consumption

Inactive Publication Date: 2010-06-09
DALIAN UNIV OF TECH
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Problems solved by technology

[0007] The application of NaA zeolite molecular sieve membran

Method used

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

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Embodiment

[0018] Preparation of NaA molecular sieve membrane synthesis solution: 6.80g NaAlO in a 200ml beaker 2 (including Al 2 o 3 wt.% = 50.0 wt.%, Na 2 (0 wt.%=38.0 wt.%) and 2.072g NaOH were fully dissolved in 107.875g water, stirred vigorously for 1h, and then 15.385g silica sol (SiO 2 wt.% = 26.0 wt.%, Na 2 O=0.05%) was slowly added to the above-stirred aluminate, and then continued to stir for 3 hours to prepare a white milky sol synthesis liquid.

[0019] Carrier pretreatment: the surface of the carrier is sequentially washed with 600 # and 800 # Sandpaper the outer surface until the surface of the carrier is smooth, soak in alkali for 24 hours each, then use ultrasonic vibration to wash away the residual alkali in the pores, then wash with deionized water until neutral, then dry naturally, and finally dry at 423K for later use.

[0020] Preparation of the seed crystal layer of the carrier: prepare the prepared nano-scale NaA molecular sieve into a 1.0wt.% seed crystal ...

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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...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D61/36C07D307/26
Inventor 王金渠周志辉杨建华鲁金明张艳殷德宏
Owner DALIAN UNIV OF TECH
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