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Binderless A-type molecular sieve particles and preparation method thereof

A binder-free and molecular sieve technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, A-type crystalline aluminum silicate zeolite, etc. Binder type A molecular sieve and other issues

Pending Publication Date: 2019-09-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, there is no report on the synthesis of binder-free A-type molecular sieve by one-pot method, and there is no report on the synthesis of binder-free A-type molecular sieve with multi-level channels.

Method used

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  • Binderless A-type molecular sieve particles and preparation method thereof
  • Binderless A-type molecular sieve particles and preparation method thereof
  • Binderless A-type molecular sieve particles and preparation method thereof

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preparation example Construction

[0109] Preparation method of binder-free type A molecular sieve

[0110] The preparation method of the present invention may comprise the following steps:

[0111] (1) adding an aqueous surfactant solution and an oil phase to the water phase; wherein, the water phase is an alkali solution containing an aluminum source, thereby forming a system containing an oil phase, a surfactant phase and a water phase;

[0112] (2) Add the silicon solution containing gelling agent and optional hierarchical porous organic template to the described system containing oil phase, surfactant phase and water phase, after removing oil phase and surfactant phase, The water phase is crystallized to form a binder-free type A molecular sieve.

[0113] The temperature of the crystallization treatment may be 50-150°C (preferably, 50-100°C, more preferably, 60-80°C).

[0114] The time for the crystallization treatment may be 0.5-60 hours (preferably, 2-48 hours, more preferably, 4-12 hours).

[0115] A...

Embodiment 1

[0136] Preparation of oil / water two-phase system: Weigh 49.2 parts of sodium metaaluminate, 12.0 parts of sodium hydroxide and 216.0 parts of deionized water and stir to dissolve at room temperature, then slowly add 15 parts of cetyl trimethyl bromide in sequence ammonium chloride saturated aqueous solution and 30 parts of n-heptane to obtain an oil / water two-phase system with a surfactant phase between the two phases.

[0137] Synthesis of type A molecular sieve: Weigh 9 parts of ammonium chloride solution with a mass fraction of 10%, add it to 45 parts of a mass fraction of 40% silica sol (the diameter of the nanoparticle is 50nm), and disperse with droplets after uniform mixing into the oil / water two-phase. After separating and recovering the upper oil phase and the surfactant phase, the water phase was crystallized at 60° C. for 24 h. After the crystallization is completed, cool, filter, wash, and dry at 90° C. for 12 hours to obtain spherical A-type molecular sieve parti...

Embodiment 2

[0139] Preparation of oil / water two-phase system: Weigh 32.8 parts of sodium metaaluminate, 16.0 parts of sodium hydroxide and 216.0 parts of deionized water and stir to dissolve at room temperature, then slowly add 15 parts of hexadecyl trimethyl bromide in sequence ammonium chloride saturated aqueous solution and 30 parts of n-heptane to obtain an oil / water two-phase system with a surfactant phase between the two phases.

[0140] Synthesis of type A molecular sieve: Weigh 9 parts of ammonium chloride solution with a mass fraction of 10%, add it to 45 parts of a mass fraction of 40% silica sol (the diameter of the nanoparticle is 50nm), and disperse with droplets after uniform mixing into the oil / water two-phase. After separating and recovering the upper oil phase and the surfactant phase, the water phase was crystallized at 80° C. for 12 h. After the crystallization is completed, cool, filter, wash, and dry at 90° C. for 12 hours to obtain spherical A-type molecular sieve p...

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Abstract

The invention relates to binderless A-type molecular sieve particles and a preparation method thereof. Specifically, the preparation method comprises the following steps: (1) adding a surfactant aqueous solution and an oil phase into an aqueous phase to form a system containing the oil phase, a surfactant phase and the aqueous phase, wherein the aqueous phase is an alkali solution containing an aluminum source; and (2) adding a silicon solution containing a gelling agent and an optional hierarchical porous organic templating agent into the system containing the oil phase, the surfactant phaseand the aqueous phase, removing the oil phase and the surfactant phase, and performing crystallization treatment on the aqueous phase to form the binderless A-type molecular sieve. The invention alsoprovides the binderless A-type molecular sieve particles having hierarchical pores and an application of the particles. The preparation method provided by the invention is simple and convenient to operate and suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthetic materials, and in particular relates to a binder-free A-type molecular sieve particle with multi-stage channels and a preparation method thereof. Background technique [0002] Type A molecular sieves with different ion types are widely used in the fields of adsorption, separation, ion exchange, and catalysis. For example, calcium ion-exchanged CaA molecular sieve (also known as 5A molecular sieve) can be used as an adsorbent to adsorb and separate n-alkanes in hydrocarbon mixtures such as naphtha, thereby realizing the directional configuration and efficient conversion of the same family of molecules, effectively improving the oil production capacity. Comprehensive utilization efficiency of resources. [0003] Although the hydrothermal synthesis process of type A molecular sieves is relatively mature, the usually synthesized products are crystalline powders, which cannot be directly a...

Claims

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Application Information

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IPC IPC(8): C01B39/14
CPCC01B39/145C01P2006/17C01P2006/12C01P2004/32
Inventor 孙辉沈本贤孙中伟刘纪昌雷星星韩笑任丹妮孔瑞琦杨世伦
Owner EAST CHINA UNIV OF SCI & TECH
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