Fast synthetic method for phosphorus-silicon-aluminum molecular sieve

A technology of SAPO-34 and synthesis method, applied in the field of molecular sieves, can solve the problems of long crystallization time, large energy consumption, and use of template agents, etc., and achieve the effect of improving selectivity

Active Publication Date: 2008-02-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
1 Cites 49 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, in these patents, more templates are used and the crys...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

Provided is a method for rapidly synthesizing a silicoaluminophosphate SAPO-34 molecular sieve, wherein triethylamine and/or diethylamine are/is used as templating agents, an organic amine accelerator is added to the initial gel for synthesis at the same time, and the gel mixture is optionally subjected to aging treatment. The method could give SAPO-34 molecular sieves with high crystallization degree in a relative short crystallization period. The SAPO-34 molecular sieve catalysts synthesized by the method can be used in the MTO or DTO reaction, the selectivity of C2~C3 olefins in the product could be up to about 90%.

Application Domain

Technology Topic

Image

  • Fast synthetic method for phosphorus-silicon-aluminum molecular sieve
  • Fast synthetic method for phosphorus-silicon-aluminum molecular sieve
  • Fast synthetic method for phosphorus-silicon-aluminum molecular sieve

Examples

  • Experimental program(8)

Example Embodiment

[0034] The rapid synthesis method of phosphosilicate-aluminum SAPO-34 molecular sieve of the present invention, the specific steps are:
[0035] a) Prepare the initial gel mixture of SAPO-34 molecular sieve by proportioning template agent, phosphorus source, aluminum source, silicon source and water;
[0036] b) Add a metered amount of organic amine accelerator to the initial gel mixture obtained in step a), and stir to obtain a uniform initial gel mixture;
[0037] c) Put the homogeneous initial gel mixture obtained in step b) into a stainless steel synthesis kettle lined with polytetrafluoroethylene, airtight, and perform aging at room temperature to 180° C., and the aging time is 1 to 12 hours.
[0038] d) The aging mixture obtained in step c) is further heated to the crystallization temperature in an airtight manner, and constant-temperature crystallization is performed under autogenous pressure. The crystallization temperature is 180-250°C, and the crystallization time is 0.5-12 hours, preferably crystallization The time is 1 to 6 hours.
[0039] e) After the crystallization is complete, the solid product is centrifuged, washed with deionized water to neutrality, and dried in the air at 120°C to obtain the original SAPO-34 molecular sieve powder.
[0040] f) The raw SAPO-34 molecular sieve powder obtained in step e) is calcined in the air at 500-600°C for 3-8 hours to obtain a SAPO-34 molecular sieve catalyst.
[0041] The SAPO-34 molecular sieve catalyst synthesized by the present invention is applied to the reaction of methanol or dimethyl ether to produce low-carbon olefins. The reaction temperature is 300-600°C, and the preferred reaction temperature is 400-500°C. The weight space velocity of raw material methanol or dimethyl ether is 1~40h -1 , C in the product 2 -C 3 The selectivity of low-carbon olefins reaches about 90%.

Example Embodiment

[0043] Example 1 (SAPO-34 molecular sieve synthesis)
[0044] With the initial gel ratio of 3.0TEA: 0.6SiO 2 : P 2 O 5 : Al 2 O 3 :50H 2 O (TEA is triethylamine template agent) mix the metered raw materials in a certain order, stir fully to form a gel, age at 80°C for 5 hours, then put it into a stainless steel autoclave lined with PTFE, and heat it in a sealed manner To 200 ℃, under autogenous pressure, constant temperature crystallization for 5 hours. The solid product was separated by centrifugation, washed with deionized water to neutrality, and dried in the air at 120°C. XRD analysis is shown in Table 1. The synthesized product is SAPO-34 molecular sieve raw powder.
[0045] Table 1 X-ray diffraction analysis results of the synthesized sample in Example 1
[0046] 2θ
[0047] 20.52

Example Embodiment

[0048] Example 2 (SAPO-34 molecular sieve synthesis)
[0049] With the initial gel ratio of 2.5TEA: 0.6SiO 2 : P 2 O 5 : Al 2 O 3 :50H 2 O: 0.1 CTAB (TEA is triethylamine templating agent, CTAB is cetyl trimethyl ammonium bromide). Mix the metered raw materials in a certain order, stir fully to form a gel, and age at 100°C for 8 hours, then Put it into a stainless steel autoclave lined with polytetrafluoroethylene, heat it to 180°C in a sealed airtight, and crystallize at a constant temperature for 2 hours under autogenous pressure. The solid product was separated by centrifugation, washed with deionized water to neutrality, and dried in the air at 120°C. XRD analysis is shown in Table 2. The synthesized product is SAPO-34 molecular sieve raw powder.
[0050] Table 2 Example 2 X-ray diffraction analysis results of synthetic samples
[0051] 2θ
[0052] 12.76
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

Classification and recommendation of technical efficacy words

Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products