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A kind of method for synthesizing nay type molecular sieve

A molecular sieve and uniform mixing technology, which is applied in the direction of octahedral crystalline aluminosilicate zeolite and crystalline aluminosilicate zeolite, etc., can solve the problems of poor modulation flexibility, low crystallinity of NaY-type molecular sieve, and high raw material requirements

Active Publication Date: 2017-07-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] USP4493902 discloses a method for synthesizing crystallized products with high zeolite content by simultaneously containing partial soil, high soil and seed crystals in the same microsphere. Very high, using superfine high soil and superfine original soil ASP~600, this kind of superfine soil is expensive and not easy to buy in the market
[0007] In the above method, the synthesis of NaY molecular sieves is carried out after kaolin spray molding becomes microspheres, and the prepared NaY molecular sieves have low crystallinity and poor modulation flexibility.

Method used

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  • A kind of method for synthesizing nay type molecular sieve
  • A kind of method for synthesizing nay type molecular sieve

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Experimental program
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Effect test

Embodiment 1

[0025] 500 g of kaolin was subjected to constant temperature hydrothermal treatment at 600° C. for 3 hours, the hydrothermal treatment pressure was 0.3 MPa, and the water injection rate was 100 ml / h to obtain modified kaolin 1. The silicon to aluminum ratio of kaolin is 2.2, and the total content of potassium oxide and sodium oxide is 0.58 wt%.

Embodiment ２

[0027] 500 g of kaolin was subjected to a constant temperature hydrothermal treatment at 650° C. for 2 hours and a hydrothermal treatment pressure of 0.1 MPa to obtain modified kaolin 2. The silicon to aluminum ratio of kaolin is 2.3, and the total content of potassium oxide and sodium oxide is 0.52 wt%.

Embodiment 3

[0029] 500g of kaolin was subjected to constant temperature hydrothermal treatment at 700°C for 5h, the hydrothermal treatment pressure was 0.2MPa, and the water injection rate was 400ml / h to obtain modified kaolin 3. The silicon to aluminum ratio of kaolin is 2.1, and the total content of potassium oxide and sodium oxide is 0.56 wt%.

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Abstract

The invention discloses a method for synthesizing NaY-type molecular sieves, which includes the following contents: (1) uniformly mixing sodium hydroxide, aluminum source, water glass and water, and aging to obtain a guiding agent; (2) making kaolin raw materials water The modified kaolin obtained by heat treatment; (3) The directing agent obtained in step (1), the modified kaolin obtained in step (2), sodium hydroxide, water and water glass are mixed uniformly to obtain a gel system, and then crystallized at low temperature , high temperature crystallization, cooling, solid-liquid separation and drying to obtain NaY molecular sieves. The method uses hydrothermally modified kaolin as a raw material, has the advantages of simple synthesis process, high crystallinity of the product, good hydrothermal stability and the like.

Description

Technical field [0001] The invention belongs to the field of molecular sieve synthesis, and specifically relates to a method for synthesizing NaY molecular sieve. Background technique [0002] The usual method for preparing NaY molecular sieves is to synthesize using alkaline silica-alumina gel system. The commonly used raw materials are sodium hydroxide, water glass, water, aluminum sulfate and sodium metaaluminate. Finally, a certain amount of directing agent is added, so that the synthesized NaY molecular sieve has the characteristics of high molecular sieve content and high silicon-to-aluminum ratio. The modified method can make the modified NaY molecular sieve have a variety of reaction characteristics. [0003] The in-situ synthesis of kaolin is an important method for the preparation of NaY molecular sieves. USP3506594, USP3503900, USP3647718 use kaolin as a raw material to simultaneously prepare active components and matrix in-situ crystallization zeolite methods. The FCC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 秦波杜艳泽柳伟张晓萍王凤来
Owner CHINA PETROLEUM & CHEM CORP