Method for preparing catalyst of containing MFI structured molecular sieve

A molecular sieve and gas phase technology, which is applied in the field of molecular sieve catalyst preparation, can solve the problems such as the preparation method of non-microspherical catalysts that have not yet been seen, and achieve the effects of high conversion rate, good selectivity and good regeneration performance.

Active Publication Date: 2005-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far there is no relevant report on the preparation method of non-microspherical catalysts applied to fixed bed technology

Method used

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  • Method for preparing catalyst of containing MFI structured molecular sieve
  • Method for preparing catalyst of containing MFI structured molecular sieve
  • Method for preparing catalyst of containing MFI structured molecular sieve

Examples

Experimental program
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Effect test

example 1

[0030] This example illustrates the first preparation of the alkaline silica sol binder used in the present invention.

[0031] Add 1500 grams of distilled water and 8 grams of reagent-grade sodium hydroxide solid into the reaction tank, heat up to 65°C, add 200 grams of silicon powder (product of Tianjin Chemical Plant, 180-240 mesh, more than 98% silicon content) under stirring, control When the temperature is below 85°C, stir and react for 2-3 hours. When the pH drops to 8-10, cool to 50°C while stirring, filter, and concentrate to its SiO 2The content of 25-45% is the alkaline silica sol used in the present invention, which is abbreviated as silica sol-1. Its physical and chemical properties and the content of various metal ion impurities contained therein are listed in Table 1, wherein the metal ion content is measured by plasma-coupled mass spectrometry (the same below).

example 2

[0033] This example illustrates a second preparation method for the alkaline silica sol binder used in the present invention.

[0034] The silica sol that will make according to example 1 passes through acrylic acid type weakly acidic cation exchange resin (Shanghai Resin Factory product, trade number 724) successively with the flow rate of 30ml / h # ) and styrene-type weakly basic anion exchange resin (product of Shanghai Resin Factory, trade number 704 # ) to remove most of the impurity ions therein, then adjust its pH to 8-10 with ammonia water, concentrate to its SiO 2 The content of 25-45% is the alkaline silica sol used in the present invention, which is abbreviated as silica sol-2. Its physical and chemical properties and the content of various metal ion impurities contained therein are listed in Table 1.

example 3

[0036] This example illustrates the preparation of the alkaline silica sol binder used in the present invention.

[0037] With 30 grams of water glass (Qingdao Ocean Chemical Factory product, modulus is 3.5, Na 2 O content 7%,) after diluting with 600 gram distilled waters, filter to remove impurity, pass through acrylic acid type weakly acidic cation exchange resin (Shanghai Resin Factory product, brand name 724) successively with the flow rate of 30ml / h # ) and styrene-type weakly basic anion exchange resin (product of Shanghai Resin Factory, trade number 704 # ) to remove most of the impurity ions therein, then adjust its pH to 8-10 with ammonia water, concentrate to its SiO 2 The content of 25-45% is the alkaline silica sol used in the present invention, which is abbreviated as silica sol-3. Its physical and chemical properties and the content of various metal ion impurities contained therein are listed in Table 1.

[0038] example

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Abstract

A MFI-molecular sieve catalyst for preparing caprolactam from cyclohexanone oxime by gas-phase Beckmann rearrangement is prepared through proportionally mixing MFI-molecular sieve with alkaline silica gel, shaping, drying and calcining. It has high conversion rate and selectivity.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve catalyst containing an MFI structure. More specifically, the present invention relates to a method for preparing a molecular sieve catalyst containing an MFI structure, which is used for the gas-phase Beckmann rearrangement of cyclohexanone oxime to prepare caprolactam. Background technique [0002] Caprolactam, the product of the Beckmann rearrangement reaction of cyclohexanone oxime, is the main raw material for the production of three series of products: nylon, industrial cord and nylon engineering plastics. Its demand has been relatively strong. It is estimated that the global demand for caprolactam will exceed 4 million in 2004. Ton. The gap of domestic caprolactam has always been relatively large, and the annual import volume is generally more than 300,000 tons. With the increase of consumption in the future, the gap of caprolactam will be even larger. [0003] Industrially, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/06C01B39/02C07D201/04C07D223/10
CPCY02P20/52
Inventor 程时标闵恩泽吴巍孙斌张树忠王恩泉
Owner CHINA PETROLEUM & CHEM CORP
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