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Method of producing MCM-49 molecular sieve

A technology of MCM-49 and molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high cost of molecular sieve, high price of hexamethyleneimine, restricting the wide application of MCM-49 molecular sieve, etc., and shorten the crystallization Time and the effect of reducing production cost

Active Publication Date: 2014-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above synthesis of MCM-49 molecular sieves is based on a hexamethyleneimine template agent, hexamethyleneimine is expensive, and the high cost of MCM-49 molecular sieves restricts the wide application of MCM-49 molecular sieves.

Method used

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  • Method of producing MCM-49 molecular sieve
  • Method of producing MCM-49 molecular sieve
  • Method of producing MCM-49 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 2.1kg of sodium metaaluminate and 0.14kg of sodium hydroxide are completely dissolved in 50kg of desalinated water to prepare sodium metaaluminate-sodium hydroxide aqueous solution; 52kg of silica sol with a mass content of 25%-30% is added to 1kg of ethyl silicate , fully stirred to obtain a silica sol-ethyl silicate emulsion; 5kg of hexamethyleneimine was added to 5kg of cyclohexylamine, and fully stirred to obtain a hexamethyleneimine-cyclohexylamine binary template agent. Add the silica sol-ethyl silicate emulsion into the gel forming tank, start stirring, add hexamethyleneimine-cyclohexylamine binary template, stir evenly, add sodium metaaluminate-sodium hydroxide aqueous solution dropwise, until After the "thick point", increase the stirring speed, open the gel, slowly add the remaining sodium metaaluminate-sodium hydroxide aqueous solution; then add 0.5kg NaMCM-49 molecular sieve, stir for 2 hours, and proceed to gelation.

[0033] Put the gelled slurry into a 1...

Embodiment 2

[0035] Dissolve 2.1kg of sodium metaaluminate and 0.084kg of sodium hydroxide completely in 50kg of desalinated water to prepare sodium metaaluminate-sodium hydroxide aqueous solution; add 52kg of silica sol with a mass content of 25%-30% to 1.3kg of ethyl silicate In the ester, stir fully to obtain a silica sol-ethyl silicate emulsion; add 7.5kg of hexamethyleneimine to 2.5kg of cyclohexylamine, and stir thoroughly to obtain hexamethyleneimine-cyclohexylamine di Metatemplating agent. Add the silica sol-ethyl silicate emulsion into the gel forming tank, start stirring, add hexamethyleneimine-cyclohexylamine binary template, stir evenly, add sodium metaaluminate-sodium hydroxide aqueous solution dropwise, until After the "thick point", increase the stirring speed, open the gel, slowly add the remaining sodium metaaluminate-sodium hydroxide aqueous solution; then add 0.6kg NaMCM-49 molecular sieve, stir for 4 hours, and proceed to gelation.

[0036] Put the gelled slurry into a...

Embodiment 3

[0038]2.1kg of sodium aluminate and 0.1kg of sodium hydroxide are completely dissolved in 50kg of desalted water to prepare sodium metaaluminate-sodium hydroxide aqueous solution; 52kg of silica sol with a mass content of 25%-30% is added to 1.2kg of ethyl silicate , fully stirred to obtain a silica sol-ethyl silicate emulsion; add 6kg of hexamethyleneimine to 4kg of cyclohexylamine, and fully stir to obtain a hexamethyleneimine-cyclohexylamine binary template . Add the silica sol-ethyl silicate emulsion into the gel forming tank, start stirring, add hexamethyleneimine-cyclohexylamine binary template, stir evenly, add sodium metaaluminate-sodium hydroxide aqueous solution dropwise, until After the "thick point", increase the stirring speed, open the gel, slowly add the remaining sodium metaaluminate-sodium hydroxide aqueous solution; then add 0.4kg NaMCM-49 molecular sieve, stir for 3 hours, and proceed to gelation.

[0039] Put the gelled slurry into a 100L crystallization k...

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Abstract

The invention relates to a method of producing an MCM-49 molecular sieve. The method includes: dissolving sodium metaaluminate or sodium aluminate, and sodium hydroxide into desalted water to prepare an aqueous sodium metaaluminate / alkali solution or an aqueous sodium aluminate / alkali solution; adding ethyl silicate into silica sol to prepare a silica sol / ethyl silicate emulsion; adding hexamethyleneimine into cyclohexylamine to prepare a hexamethyleneimine-cyclohexylamine binary template agent, adding the binary template agent into the silica sol / ethyl silicate emulsion, fully stirring, adding dropwise the aqueous sodium metaaluminate / alkali solution or the aqueous sodium aluminate / alkali solution, adding a NaMCM-49 molecular sieve, colloidizing and crystallizing to prepare the MCM-49 molecular sieve. According to the method, the binary template agent is adopted, the organosilicone source is increased, the using amount of the seed crystal is increased, the crystallizing time is shortened, and the production cost of the MCM-49 molecular sieve is reduced.

Description

Technical field: [0001] The invention relates to a method for producing MCM-49 molecular sieves, in particular to a method for producing MCM-49 molecular sieves by adding crystal seeds to a composite template agent and adding organic silicon sources. Background technique [0002] MCM-49 molecular sieves are a series of layered molecular sieves with MWW structure. Its crystals are sheet-like and have three different pore structures. First, similar to ZSM-5 molecular sieve, it has a set of two-dimensional sinusoidal channels with a pore size of sixteen-membered rings (0.4×0.59nm), but the openings are slightly smaller than ZSM-5, and the channel network is more developed; second, there are 0.71 ×0.71×1.82nm supercage, the opening of which is a sixteen-membered ring (0.4×0.54nm); third, the upper and lower surfaces of the crystal have a high-density pore structure, and the opening of the hole is a twelve-membered ring, with a depth of about 0.7nm. Because of its unique structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 邓广金赵胤肖冰李正孙建刚曲凤华许济峰
Owner PETROCHINA CO LTD
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