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Method for preparing regular cubic particle SAPO-34 (Silicoaluminophosphate-34) molecular sieve and application thereof

A SAPO-34, cubic particle technology, used in molecular sieve catalysts, including molecular sieve catalysts, molecular sieves and alkali-exchanged phosphates, etc., can solve the problems of difficult product morphology control, difficult molecular sieve slurry, high process costs, and achieve excellent catalytic performance. , to facilitate solid-liquid separation and improve the effect of specific surface area

Active Publication Date: 2016-04-06
天津众智科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shape of the product synthesized by the existing SAPO-34 molecular sieve synthesis technology is not easy to control, the particles are small, and it is not easy to recover the molecular sieve from the molecular sieve slurry in the industrial production process, and the process cost is high

Method used

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  • Method for preparing regular cubic particle SAPO-34 (Silicoaluminophosphate-34) molecular sieve and application thereof
  • Method for preparing regular cubic particle SAPO-34 (Silicoaluminophosphate-34) molecular sieve and application thereof
  • Method for preparing regular cubic particle SAPO-34 (Silicoaluminophosphate-34) molecular sieve and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 (raw material mol ratio is 35H 2 O: 1.0R: 0.2SiO 2 : 1.1P 2 o 5 :Al 2 o 3 )

[0048] Gel preparation: first mix 1767.6 grams of 25wt% tetraethylammonium hydroxide aqueous solution with 540.9 grams of distilled water in a water bath at 20°C with a stirring speed of 200 rpm, then slowly add 760.9 grams of 85wt% phosphoric acid and stir evenly, then slowly add 90.2 grams of 40wt% neutral silica sol, continue to stir evenly; then slowly add 425 grams of pseudo-boehmite, increase the stirring speed to 600 rpm and stir for 5 hours to make the solution gel; Shear at 13,000 rpm for 100 minutes on a plastidizer to prepare a homogeneous gel.

[0049] Aging: Take 600ml of the above-mentioned homogeneous gel and transfer it into a 2L dynamic hydrothermal reactor, and the filling rate of the reactor is 30% (v / v). Control the temperature at 30°C, and use a vacuum pump to pump the pressure inside the reactor into a negative pressure state. The gauge pressure displa...

Embodiment 2

[0053] Embodiment 2 (material ratio is 40H 2 O: 1.5R: 0.1SiO 2 : 1.0P 2 o 5 :Al 2 o 3 )

[0054] Gel preparation: first mix 2209.5 grams of 30wt% tetraethylammonium hydroxide aqueous solution with 555.8 grams of distilled water, 10 ℃ ice-water bath, stirring speed 300 rpm, then slowly add 735 grams of 80wt% phosphoric acid and stir evenly, then slowly Add 51.5 grams of 35wt% neutral silica sol, and continue to stir evenly; then slowly add 425 grams of pseudo-boehmite, increase the stirring speed to 700 rpm and stir for 4 hours to make the solution into a uniform gel; The gel was sheared on a homogenizer at 15,000 rpm for 80 minutes, and the preparation of the gel was completed.

[0055] Aging: Take 1.4L of the above-mentioned homogeneous gel and transfer it into a 2L dynamic hydrothermal reactor, and the filling rate of the reactor is 70% (v / v). Control the temperature at 40°C, and use a vacuum pump to pump the pressure inside the reactor into a negative pressure state....

Embodiment 3

[0059] Embodiment 3 (material ratio is 28H 2 O: 1.3R: 0.08SiO 2 : 1.0P 2 o 5 :Al 2 o 3 )

[0060] Gel preparation: first mix 1795.2 grams of 32wt% tetraethylammonium hydroxide aqueous solution with 177.5 grams of distilled water in a 30°C water bath with a stirring speed of 250 rpm, then slowly add 717.1 grams of 82wt% phosphoric acid and stir evenly, then slowly add 48.1 grams of 30wt% neutral silica sol, continue to stir evenly; then slowly add 425 grams of pseudo-boehmite, increase the stirring speed to 800 rpm and stir for 2 hours, so that the solution becomes a uniform gel; then the uniform gel Shear on a homogenizer at 12,000 rpm for 90 minutes, and the gel is prepared.

[0061] Aging: Take 1L of the above-mentioned homogeneous gel and transfer it into a 2L dynamic hydrothermal reactor, and the filling rate of the reactor is 50% (v / v). Control the temperature at 50°C, and use a vacuum pump to pump the pressure inside the reactor into a negative pressure state. The...

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Abstract

The invention discloses a method for preparing a regular cubic particle SAPO-34 (Silicoaluminophosphate-34) molecular sieve, wherein the method comprises the following steps of mixing a template agent with distilled water, sequentially adding a phosphorus source, a silicon source and an aluminum source, stirring the sources to form gel, preparing homogeneous gel by means of cutting the gel through a homogenizer, vacuumizing the homogenized gel, and ageing, crystallizing and activating the vacuumized homogeneous gel so as to obtain a white active molecular sieve. The regular cubic particle SAPO-34 molecular sieve prepared according to the method disclosed by the invention has the advantages of regular shape, easiness in recycling, low cost, high specific surface area, and better MTO (Methanol to Olefins) catalytic performance.

Description

technical field [0001] The invention belongs to a molecular sieve and a preparation method thereof, in particular to a method for preparing a SAPO-34 molecular sieve and an application thereof. Background technique [0002] The methanol-to-olefins (MTO) process is a process for preparing low-carbon olefins such as ethylene and propylene from coal or natural gas through methanol. In U.S. Patent No. 4,440,871, U.S. Carbide Corporation (UCC) developed a new series of silicoaluminophosphate molecular sieves (SAPO-n). Among them, SAPO-34 molecular sieve is made of SiO 2 , AlO 2 - 、PO 2 + Three kinds of tetrahedrons are connected with each other and have a chabazite-like (CHA) structure. It is an ellipsoidal cage composed of eight-membered rings and a three-dimensional pore structure. The diameter of the window is 0.38 nanometers, and the spatial symmetry group is R3m. SAPO-34 is currently recognized as the best molecular sieve for MTO reaction. [0003] The study found tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20C07C11/02C07C11/04C07C11/06
CPCB01J29/85C01B37/08C01B39/54C01P2004/03C01P2004/38C01P2006/12C01P2006/14C07C1/20C07C2529/85C07C11/02C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 常云峰黄小东周杰
Owner 天津众智科技有限公司
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