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Modified molecular sieve and preparing method thereof

A molecular sieve and molecular sieve lattice technology are applied in the field of composite molecular sieves with TON and MFI structure modification and the preparation of the molecular sieves, which can solve the problems of affecting the physical and chemical properties of molecular sieves, high residual carbon content of molecular sieves, and difficult oxidation/decomposition, etc. The effect of stable properties, large pore volume and surface area, and high skeleton Si-Al ratio

Inactive Publication Date: 2005-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods may cause the organic template to generate substances that are more difficult to oxidize / decompose, resulting in blockage of the pores of the molecular sieve or excessive carbon content in the molecular sieve, which will affect the physical and chemical properties of the molecular sieve

Method used

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  • Modified molecular sieve and preparing method thereof
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  • Modified molecular sieve and preparing method thereof

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preparation example Construction

[0027] In the organic solvent treatment process in the preparation method of the modified molecular sieve of the present invention, the organic solvent used can be selected from acetone, C 1 ~C 3 Alcohols and C 1 ~C 3 One or more of organic acids, preferably C 1 ~C 3 Alcohols, more preferably methanol. The treatment temperature can be from room temperature to 500°C, preferably from 80°C to 200°C, more preferably under reflux conditions in the solvent. The process pressure is the pressure to keep the solvent in the liquid phase, preferably an autogenous pressure. The treatment time is generally 0.5h-48h, preferably 1h-12h, more preferably 2h-4h. The amount of organic solvent used (ratio of liquid / solid mass) is generally 0.5-50, preferably 2-20, more preferably 5-10.

[0028]In the process of ion exchange in the method of the present invention, the solution used is to contain the compound solution that needs to introduce cations, preferably H + or / and NH 4 + A solutio...

Embodiment 1

[0037] A preparation process of a composite molecular sieve with two structures of TON and MFI is as follows:

[0038] (a) The preparation process of the gel is: 17.75 grams of 82% KOH, 37.8 grams of 1,8-octanediamine, 4 grams of AlCl 3 , 200 g SiO 2 30% silica sol, 2.9 g KF, 0.5 g SiO 2 / Al 2 o 3 TON structure molecular sieve (seed crystal, prepared in Comparative Example 1) with an average grain size of 44 and 0.6 microns and 577 grams of water were mixed together in a certain order, and after 20 minutes of vigorous stirring, a uniform gel-like mixture was obtained, and a condensed The molar composition of the glue is:

[0039] 1.3K 2 O / 3.00 R / 0.15 Al 2 o 3 / 10 SiO 2 / 0.5KF / 400H 2 O+0.06% SR=1,8-octanediamine, S is the seed crystal.

[0040] (b) Crystallization process: transfer the gel obtained in step (a) to a stainless steel autogenous pressure reactor, raise the reactor from room temperature to 165°C within two hours, stop heating after 48 hours of static cons...

Embodiment 2

[0049] The preparation process of a kind of modified molecular sieve is:

[0050] (1) Take 15 grams of the composite molecular sieve synthesized in Example 1, add it to a flask filled with 300 milliliters of methanol, and boil the solution at a heating rate of 1.5° C. / min under stirring conditions, reflux for 3 hours, and filter after finishing , washing and drying to obtain a molecular sieve from which the organic template agent has been removed.

[0051] (2) Same as step (2) of Comparative Example 2 to obtain dealuminated molecular sieves.

[0052] (3) With comparative example 2 step (3), obtain modified molecular sieve, numbering is E-2, and its XRD sees Figure 6 , the properties of the product are shown in Table 3.

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Abstract

A modified molecular sieve is prepared from the raw molecular sieve powder containing organic templating agent through treating it in organic solvent, ion exchanging, removing Al, and supplementing Si. Its advantages are good crystal form, high crystallinity and low content of residual carbon.

Description

technical field [0001] The invention relates to a modified molecular sieve and its method, more specifically, it provides a modified composite molecular sieve with TON and MFI structures and a preparation method of the molecular sieve. Background technique [0002] Molecular sieves are important members of crystalline materials and have regular pore structure crystal structures (which can be characterized by XRD). At present, many kinds of molecular sieves have been found, such as zeolite A, ZSM series, β, X, Y, SASAPO series and other microporous molecular sieves and MCM-41 and other medium pore molecular sieves. [0003] The adsorption and catalytic properties of molecular sieves are closely related to the size of their pores and pores. Molecular sieves with different pore structures generally have different uses. For example, ZSM-5 molecular sieves are mainly used in the reaction processes of shape-selective cracking, alkylation, small molecule isomerization, toluene dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04C01B39/48
Inventor 刘全杰徐会青孙万付周勇杨军王伟
Owner CHINA PETROLEUM & CHEM CORP
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