Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation modification method of Y-type molecular sieve

A molecular sieve and modification technology, which is applied in the directions of fauhhedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of low activity, small batch size and high energy consumption, and achieves simple preparation process, low production cost, low pollution effect

Active Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP +1
View PDF17 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1382632A discloses a super-stabilizing method of small-grain Y-type zeolite, which is obtained by contacting the dry gas of silicon tetrachloride with small-grain NaY zeolite and washing it. Stability is just relatively poor, and this inventive method adopts the mode of vapor phase dealumination of silicon to process molecular sieve simultaneously, and this makes the thermal and hydrothermal stability of product worse, and activity is low; Small, high energy consumption and other disadvantages
Although the above two modification methods can increase the silicon-aluminum ratio of the molecular sieve skeleton, the fluoride ions introduced by the additives are difficult to elute from the slurry, and a large amount of fluoride ions remain in the liquid after the molecular sieve is washed, causing environmental problems in industrial production.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation modification method of Y-type molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 50.39g high alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changling Branch, Al 2 o 3 The content is 40.2g / L, Na 2 O content is 255g / L, specific gravity is 1.324) joins 65.56g water glass (Sinopec Catalyst Changling Branch provides, SiO 2 The content is 260.6g / L, Na 2 The O content is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), aged with stirring at room temperature for 48 hours, then statically aged at 60°C for 5 hours, and finally added 15g of deionized water, the resulting directing agent has a final molar ratio of 15Na 2 O: A1 2 o 3 :15SiO2 2 :320H 2 O.

[0030] All the directing agents prepared were used in the preparation of the following reaction mixture, and the amount of the directing agent added was calculated according to the fact that the moles of aluminum in the directing agent accounted for 3% of the total moles of aluminum.

[0031] Under the conditions of room temperature and high-speed stirring, accordi...

Embodiment 2

[0043] 50.39g high alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changling Branch, Al 2 o 3 The content is 40.2g / L, Na 2 O content is 255g / L, specific gravity is 1.324) joins 65.56g water glass (Sinopec Catalyst Changling Branch provides, SiO 2 The content is 260.6g / L, Na 2 The O content is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), aged with stirring at 60°C for 5 hours, then statically aged at 60°C for 5 hours, and finally added 15g of Ionized water, the final molar ratio of the resulting directing agent is 15Na 2 O: A1 2 o 3 :15SiO2 2 :320H 2 O.

[0044] All the directing agents prepared were used in the preparation of the following reaction mixture, and the amount of the directing agent added was calculated according to the fact that the moles of aluminum in the directing agent accounted for 3% of the total moles of aluminum.

[0045] Under the conditions of room temperature and high-speed stirring, according to the dire...

Embodiment 3

[0057] With 164.54g high alkali sodium metaaluminate solution (Sinopec Catalyst Changling Branch Company provides, Al 2 o 3 The content is 40.2g / L, Na 2 O content is 340g / L, specific gravity is 1.297) joins 291.37g water glass (Sinopec Catalyst Changling Branch provides, SiO 2 The content is 260.6g / L, Na 2 The O content is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), aged with stirring at 30°C for 20 hours, then statically aged at 40°C for 15 hours, and finally added 60g of ionized water. The resulting directing agent has a final molar ratio of 20Na 2 O: A1 2 o 3 :20SiO2 2 :380H 2 O.

[0058] All the directing agents prepared were used in the preparation of the following reaction mixture. The amount of the directing agent added was calculated according to the fact that the moles of aluminum in the directing agent accounted for 10% of the total moles of aluminum.

[0059] Under the conditions of room temperature and high-speed stirring, according ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing and modifying a Y-type molecular sieve, wherein the method comprises the steps of ammonia exchange on a NaY molecular sieve, treatment under a hydrothermal condition, modification by adding a silica sol, a alcohol substrate and a citric acid solution, and the like. The NaY molecular sieve is obtained by successively adding a guiding agent, a silicon source, an aluminum source and water into a mixing pot to obtain a mixture A for hydrothermal crystallization, wherein, the guiding agent is obtained by the following processes: mixing sodium metaaluminate and water glass to make the mole concentration of the aluminum element in the water glass be increased from zero so as to form a mixture B having a mole ratio of (6-25)Na2O: Al2O3:(6-25)SiO2, sequentially carrying out dynamic aging and standing aging, and adding water. According to the molecular sieve product, the cell parameter is 2.461-2.467 nm, the molecular sieve has higher crystallization retention degree, and the average diameter of the crystalline grain is 50-800 nm.

Description

technical field [0001] The invention relates to a method for preparing and modifying a Y-type molecular sieve, more specifically, the invention relates to a method for preparing and modifying a Y-type molecular sieve under a non-template agent. Background technique [0002] In the late 1950s, Milton and Breck successfully synthesized Y-type molecular sieves. Due to the SiO in the structure of the Y-type molecular sieve 2 with Al 2 o 3 The ratio is greater than that of X-type molecular sieve, so that the thermal stability and hydrothermal stability are improved. In the early 1970s, Grace Company developed the directing agent method to synthesize NaY molecular sieves. The raw material was water glass instead of expensive silica sol. The process was simplified and the growth cycle was shortened, so that NaY molecular sieves were rapidly and widely used in petrochemical industries The field of petroleum cracking catalysis. So far, among the hundreds of molecular sieves that...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 鲁玉莹付强李永祥胡合新慕旭宏
Owner CHINA PETROLEUM & CHEM CORP