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Method for synthesizing monolithic 4A molecular sieve by dry glue process

A monolithic, molecular sieve technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of waste of raw materials, pollution, complicated procedures of 4A molecular sieve, etc. low cost effect

Inactive Publication Date: 2014-11-26
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention aims to solve the problems of complex procedures, waste of raw materials and environmental pollution in the production process of 4A molecular sieve, and provides a method for synthesizing integral 4A molecular sieve in one step by dry glue method

Method used

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  • Method for synthesizing monolithic 4A molecular sieve by dry glue process
  • Method for synthesizing monolithic 4A molecular sieve by dry glue process
  • Method for synthesizing monolithic 4A molecular sieve by dry glue process

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Dissolve 2.8g NaOH in 6g of water in a plastic beaker, take 10g of metakaolin and add it to the above solution under stirring conditions, mix the metakaolin and sodium hydroxide solution evenly to form a dry gel, then extrude into strips, at room temperature After aging for 4 hours, put it into a polytetrafluoroethylene crystallization kettle with a water jacket interlayer, add 4g of water to the bottom of the interlayer of the crystallization kettle, and crystallize at 100°C for 5 hours to obtain a molecular sieve. Figure analysis, the molecular sieve is 4A molecular sieve, such as figure 1 as shown, figure 2 It is the photo of the molecular sieve of the present embodiment 4A.

Embodiment 2

[0028] Dissolve 3g NaOH in 6g water in a plastic beaker, take 10g metakaolin and add it to the above solution under stirring conditions, mix metakaolin and sodium hydroxide solution evenly to form a dry gel, extrude it into a honeycomb shape, and age at room temperature After 4 hours of melting, put it into a polytetrafluoroethylene crystallization kettle with a water jacket interlayer, add 3g of water to the bottom of the crystallization kettle interlayer, and crystallize at 95°C for 5 hours. Analyze by XRD spectrum , to obtain 4A molecular sieve.

Embodiment 3

[0030] Dissolve 3.5g NaOH in 6g water in a plastic beaker, take 10g metakaolin and add it to the above solution under stirring conditions, mix metakaolin and sodium hydroxide solution evenly to form a dry gel, then the water column becomes spherical, and age at room temperature After 4 hours, put it into a polytetrafluoroethylene crystallization kettle with a water jacket interlayer, add 3g of water at the bottom of the interlayer of the crystallization kettle, and crystallize at 95°C for 5 hours. After XRD spectrum analysis, Get 4A molecular sieve, image 3 It is the photo of the molecular sieve of the present embodiment 4A.

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Abstract

The invention discloses a method for synthesizing a monolithic 4A molecular sieve by a dry glue process, relating to the technical field of molecular sieve synthesis. The method comprises the following steps: evenly mixing an alkali source, an aluminum source, a silicon source and water in a mole ratio of (0.3-5) Na2O:Al2O3:(1.7-2.5) SiO2:(3-12) H2O to prepare preformed dry glue; aging the preformed dry glue at room temperature for 0.5-30 hours, putting in a reaction kettle with a water jacket barrier, and crystallizing at 75-110 DEG C for 0.5-30 hours, wherein the mass ratio of the water to the preformed dry glue in the reaction kettle in the crystallization process is 0.05:(1-1.1); and washing the crystallization product, and drying to obtain the monolithic 4A molecular sieve. The monolithic 4A molecular sieve has favorable strength, does not need reforming, and can be directly used as an adsorbent or catalyst support. The method is capable of simplifying the traditional technical process, enhancing the synthesis efficiency and raw material utilization ratio and lowering the synthesis cost, and has the advantages of no mother solution discharge and environment friendliness.

Description

Technical field: [0001] The invention belongs to the field of synthesis of molecular sieve materials, and in particular relates to a method for synthesizing 4A molecular sieves. Background technique: [0002] The composition of 4A molecular sieve is Na 12 Al 12 Si 12 o 48 27H 2 O, belonging to the cubic crystal system, the structural characteristics of its eight-membered ring make 4A molecular sieve to Ca 2+ , H2O and other small molecular substances have strong absorption and exchange capabilities, and are the best substitutes for sodium tripolyphosphate, which has serious pollution to water bodies. 4A molecular sieves are widely used as additives in the washing industry, and are also widely used in petroleum cracking and adsorbent industries. [0003] At present, there are three methods for producing 4A molecular sieve, chemical synthesis method, acidified bentonite method and kaolin high-temperature calcination method. These are all using traditional hydrothermal s...

Claims

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Application Information

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IPC IPC(8): C01B39/14
Inventor 霍志萍裴仁彦张耀日范景新刘冠锋臧甲忠于海斌
Owner CHINA NAT OFFSHORE OIL CORP
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