Method for synthesizing flokite

A synthesis method and technology of mordenite, applied in the direction of mercerized crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of mordenite failure, crystallinity reduction, etc., and achieve the effect of improving conversion rate and yield

Active Publication Date: 2007-01-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in currently known methods for synthesizing mordenite, the silica-alumina ratio of the synthetic gel used is generally 10-200
However, according to existing methods, artificially increasing the silicon-aluminum ratio of the synthetic gel will lead to the failure of mordenite synthesis or the reduction of crystallinity

Method used

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  • Method for synthesizing flokite
  • Method for synthesizing flokite
  • Method for synthesizing flokite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032](1) Weigh 40 g of raw corn starch (commercially available), add 400 g of distilled water, stir until it dissolves, and then gelatinize at 100°C for 18 hours to obtain gelatinized starch.

[0033] (2) Mix 122g of water and 16g of sodium hydroxide (purity 96%), stir and dissolve; then add SiO 2 Content is 28% silica sol (commercially available commodity) 93g, 7.6g NaY (commercially available commodity or synthesized with reference to open literature), stir respectively 20min and make it mix homogeneously, obtain initial gel mixture, wherein the ratio between each raw material ( According to the molar ratio of oxide molecules, the following are the same):

[0034] SiO 2 / Al 2 o 3 = 53,

[0035] Na 2 O / SiO 2 =0.43,

[0036] h 2 O / SiO 2 = 24;

[0037] (3) Add the gelatinized starch (1) into the gel (2), stir for 20 minutes, transfer it to a pressure-resistant reactor and crystallize at 160° C. for 72 hours. After the crystallization was completed, the pressure-resi...

Embodiment 2

[0040] (1) Weigh 40g of quaternary ammonium cationic starch (commercially available, degree of substitution = 0.02), add 400g of distilled water and 0.8g of sodium hydroxide (purity 96%), stir until it dissolves, and then gelatinize in an oil bath at 100°C 3h to get gelatinized starch.

[0041] (2) Weigh 122g of water, 16g of sodium hydroxide (purity 96%), stir and dissolve; then add SiO 2 93g of silica sol (commercially available) with a content of 28% and 7.6g of dried conventional NaY (commercially available or synthesized with reference to open literature) were stirred for 20 min to make them evenly mixed to obtain the initial gel mixture, wherein each raw material The ratio between (according to the oxide molecular ratio) is:

[0042] SiO 2 / Al 2 o 3 = 53,

[0043] Na 2 O / SiO 2 =0.43,

[0044] h 2 O / SiO 2 = 24;

[0045] (3) Add the gelatinized starch (1) into the gel (2), stir for 20 minutes, transfer it to a pressure-resistant reactor and crystallize at 160°C ...

Embodiment 3

[0048] (1) Weigh 40 g of quaternary ammonium cationic starch (commercially available, substitution degree = 0.02), add 400 g of distilled water, stir until it dissolves, and then gelatinize at 100° C. for 18 hours to obtain gelatinized starch.

[0049] (2) Mix 271.5g of water and 27.5g of sodium hydroxide (purity 96%), stir and dissolve; then add SiO 2 214.3g, 1.56g Al(OH) of silica sol (commercially available) with a content of 28% 3 , respectively stirred for 20min to make it evenly mixed to obtain the initial gel mixture, wherein the ratio between the raw materials (by oxide molecular ratio) is:

[0050] SiO 2 / Al 2 o 3 =100,

[0051] Na 2 O / SiO 2 =0.33,

[0052] h 2 O / SiO 2 = 24;

[0053] (3) Add the gelatinized starch (1) into the gel (2), stir for 20 minutes, add sulfuric acid to adjust the pH value to 12.0, transfer it to a pressure-resistant reactor, stir and crystallize at 180°C for 48 hours. After the crystallization was completed, the pressure-resistant r...

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Abstract

This invention provides a method for synthesizing mordenite, which takes brei starch as the template agent to add it into an initial gel mixture prepared with alkali material, silicon and Al raw substances to become a reacted mixture gel then to be hydrothermal-crystallized to get the mordenite, in which, the mol ratio of the compositions of the gel mixture according to its oxide is: M2O : SiO2 : Al2O3 : H2O=2-100 : 9-550 : 1 : 100-9000, and M is alkali metal.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a method for synthesizing mordenite. Background technique [0002] Mordenite is a molecular sieve with an eight-membered ring and a twelve-membered ring intersecting structure, and its chemical composition mainly contains silicon and aluminum. Due to its high silicon-aluminum ratio, thermal and hydrothermal stability, and unique catalytic performance, mordenite has been widely used in hydrogenation, alkylation, isomerization, disproportionation, catalytic cracking, In reactions such as transalkylation, dewaxing, and methanol amination, it is also widely used as an adsorbent in the separation process of gas or liquid mixtures, so it is a very important functional inorganic material. [0003] Mordenite, regardless of natural mordenite and mordenite synthesized by general methods, its silicon-aluminum ratio (SiO 2 / Al 2 o 3 molar ratio) is generally 9-12, that is, conventional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26
Inventor 申宝剑龚朝兵
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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