Process method of improved 13X molecular screen

A molecular sieve, an improved technology, applied in the chemical industry, can solve the problem of low packing density of molecular sieves

Inactive Publication Date: 2007-07-04
LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD
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Problems solved by technology

[0012] In order to solve the problem of low bulk density of molecular sieves in the prior art, the purpose of the present invention is to provide a method for preparing an improved 13X molecular sieve, so that the produced molecular sieve raw powder product can reach a bulk density of ≥0.68g / ml and a crystal size of 4 -6μm, due to the increase in bulk density, the molecular sieve can be filled with a larger amount of molecular sieve in the rated volume of the reaction vessel, so as to be more widely applicable to such as gas drying, purification and numerous separation processes and petroleum refining and petrochemical processes, so that Improve product performance and efficiency, meet the needs of the domestic market, and then open up the international market

Method used

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  • Process method of improved 13X molecular screen
  • Process method of improved 13X molecular screen
  • Process method of improved 13X molecular screen

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preparation example Construction

[0028] In the preparation method of the improved 13X molecular sieve, the synthesis of the molecular sieve adopts a hydrothermal synthesis process and a Barrer non-equilibrium synthesis method. The molecular sieve is a metastable phase produced under non-equilibrium conditions. When using sodium silicate as a silicon source and When sodium aluminate is used as the aluminum source, the silicate in the liquid phase has different polymerization states, and the aluminate and aluminosilicate have different structures and states. The metastable phase produced during the synthesis of zeolite is unstable and easily Therefore, although the synthesis operation process is not complicated, there are many factors affecting the synthesis; in alkaline medium, silicate and aluminate polymerize into gel, and after hydrothermal crystallization, a certain pore structure, Zeolite molecular sieve with certain pore diameter:

[0029]

[0030] For example: Na·Al 2 o 3 ·2~3SiO2 2 ·6H 2 O X typ...

Embodiment

[0056] According to the ratio of ingredients: molar ratio

[0057] Na 2 O / Al 2 o 3 3.0~4.0

[0058] SiO 2 / Al 2 o 3 2.5~3.0

[0059] h 2 O / Al 2 o 3 30~40

[0060] Synthesis: aging and crystallization According to the given process formula and process conditions, calculate the dosage of various materials, according to the order of feeding, after feeding into gel, transfer to the crystallization tank for aging, after aging, heat up and crystallize , according to the specified crystallization time, after the crystallization is completed, the material is discharged;

[0061] Filtration: Filter the synthesized slurry through a plate and frame filter to achieve solid-liquid separation, and recycle the remaining NaOH mother liquor, then wash with water to PH 10-11, wind pressure drainage, and discharge;

[0062] Drying: Add the air-pressed filter cake to the flash drying equipment to dry and remove the wet water, so as to ensure that t...

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Abstract

The disclosed preparation method with hydrothermal and Barrer non-equilibrium synthesis techniques is for improved 13X molecular sieve. Wherein, the said sieve is metastable phase; when using sodium silicate and sodium aluminate as silicon source and aluminium source separately, the silicate radical has different polymerization states, the aluminate radical and aluminosilicate radical have different structures and states; in alkaline condition, the silicate and aluminate polymerize and form crystallized glue and obtain the said sieve; wherein, the mole ratio of indredients is: Na2O / Al2O3: 3.0-4.0, SiO2 / Al2O3: 2.5-3.2, H2O / Al2O3: 30-40.

Description

Technical field: [0001] The invention relates to the technical field of chemical industry, and relates to a preparation method of an improved 13X molecular sieve. Background technique: [0002] At present, in the field of adsorption and separation, such as gas drying, purification and numerous separation processes; in the field of petroleum refining and petrochemical industry; in the detergent industry, more and more molecular sieve materials are used. [0003] Typical chemical composition of X-type molecular sieve: Na 2 O·Al 2 o 3 ·(2.8±0.2)SiO2 2 ·(6-7)H 2 o [0004] Molecular ratio of silicon to aluminum: SiO 2 Al 2 O 3 = 2.6 - 3.0 [0005] Effective aperture: 9-10 Ȧ [0006] The structure of X-type molecular sieve: [0007] Synthetic zeolite molecular si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/22B01J20/18
Inventor 夏汉祥魏瑜伟
Owner LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD
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