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Method for preparing molecular sieve ZSM-5

A ZSM-5, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc. Large, low production efficiency, long crystallization time and other problems, to achieve the effect of short crystallization time, improved productivity, and pure crystal phase

Inactive Publication Date: 2011-04-06
YUEYANG YITIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The shortcomings of the existing synthetic ZSM-5 molecular sieve technology: the crystallization time is long, generally takes 24-120 hours, and the production efficiency is low; The crystal phase, particle morphology and particle size have a great influence

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0030] Embodiment 1-6: The laboratory prepares the precursor glue according to the template-free method. The reactor is a 500ml three-neck flask placed in a constant temperature water bath, and the sealed container is a polytetrafluoroethylene tank.

Embodiment 1

[0032] Take by weighing 6.0 grams of NaOH (NaOH≥96%wt%, analytically pure), 2.46 grams of NaAlO 2 (Sinopec, Yueyang Changling Catalyst Factory), add 203 grams of deionized water, NaOH, NaAlO 2 , deionized water was put into the reactor, and stirred for 2 hours at a rotation speed of 300 rpm, and the temperature of the water bath was controlled to be 70° C., so that the solution was mixed evenly. Then slowly add 130ml of silica sol (SiO 2 Content 30%wt%, produced by Qingdao Ocean Chemical Factory), making the raw material proportioning be 12Na 2 O: 100SiO 2 : 2Al 2 o 3 : 2500H 2 O. After the silica sol was added dropwise, the prepared glue solution was aged at room temperature for 24 hours. Add 2% seed crystals according to the mass ratio, stir evenly, put it into a sealed container with a lined polytetrafluoroethylene tank, place it in the microwave field of the microwave equipment, and turn on the microwave device. Adjust the power to 1600 watts and use microwaves to ...

Embodiment 2

[0034] Same as Example 1 proportioning: take by weighing 6.0 grams of NaOH (NaOH≥96%wt%, analytically pure), 2.46 grams of NaAlO 2 (Sinopec, Yueyang Changling Catalyst Factory), add 203 grams of deionized water, NaOH, NaAlO 2 , deionized water was put into the reactor, and stirred for 2 hours at a rotation speed of 300 rpm, and the temperature of the water bath was controlled to be 70° C., so that the solution was mixed evenly. Then slowly add 130ml of silica sol (SiO 2Content 30% wt%, produced by Qingdao Ocean Chemical Factory). After the silica sol was added dropwise, the prepared glue solution was aged at room temperature for 24 hours. Add 3% seed crystals according to the mass ratio, stir evenly, put it into a sealed container with a polytetrafluoroethylene liner, place it in the microwave field of the microwave equipment, and turn on the microwave device. Adjust the power to 1600 watts and use microwaves to directly irradiate the glue in the closed tank to crystallize;...

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Abstract

The invention relates to a method for preparing a molecular sieve ZSM-5 by preparing a precursor glue solution, crystallizing, filtering, drying and roasting. The invention adopts two crystallization methods, one method comprises the following steps of: directly illuminating the precursor glue solution in a sealed container by adopting a microwave field, and crystallizing by utilizing the coaction of the microwave effect and the autogenous hydrothermal pressure of the glue solution; and the other method comprises the following steps of: heating the precursor glue solution in the sealed container by adopting saturated steam for crystallization treatment, wherein the heating and the crystallization treatment can be simultaneously carried out in the microwave field. The saturated steam for the crystallization treatment is crystallized at 170-180 DEG C for 1-6h, 1-10 percent by weight of inoculating seeds are added after aging the precursor glue solution and before crystallizing the precursor glue solution which is prepared by adopting a template-free preparation method. The method of the invention has the following advantages of simple and practical process and uniform temperature in the crystallization process, obtains the molecular sieve with high crystallinity, pure crystal phase, controllable grain size, wider range and short crystallization time, can improve the production efficiency, decrease the cost and save energy.

Description

technical field [0001] The invention relates to a method for preparing ZSM-5 molecular sieve. Background technique [0002] Since ZSM-5 zeolite was first successfully synthesized by Mobil Corporation of the United States in the 1970s, ZSM-5 zeolite molecular sieves have been widely used in petroleum processing and petrochemical fields as catalytic materials. The basic structural unit of this Pentasil molecular sieve is eight five-membered rings connected by silica-alumina tetrahedrons. Such structural units are connected into a continuous shape by sharing edges, and then connected into sheets. Using different methods (mirror symmetry or centrosymmetry) for the sheet structure, zeolite molecular sieves with two topological structures, MFI and MEL, can be obtained respectively. According to the different constituent elements, Pentasil molecular sieves can be divided into silicon aluminum type (ZSM-5 and ZSM-11), all silicon type (Silicalite-1, Silicalite-2) and titanium silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
Inventor 万焱波黄道培周继承
Owner YUEYANG YITIAN CHEM
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