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Method for preparing small crystal grain SAPO-34 molecular screen

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve catalyst, molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problem of effective utilization of geographical constraints, and achieve the goal of reducing crystallization temperature and pressure Effect

Inactive Publication Date: 2012-01-04
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Natural gas is favored because of its abundant reserves and no pollution. However, most of it is distributed in remote areas in my country, and its effective utilization is subject to great geographical constraints.

Method used

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  • Method for preparing small crystal grain SAPO-34 molecular screen
  • Method for preparing small crystal grain SAPO-34 molecular screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, 5.1 ml of phosphoric acid (concentration of 85% analytically pure orthophosphoric acid) was added to 27.0 ml of deionized water while stirring at 40°C, and 5.1 grams of pseudoboehmite (Al 2 o 3 Content is 75%), stirred for 30 minutes. After the pseudo-boehmite is completely dissolved, slowly add 9.2ml of silica sol (SiO 2 content of 30% alkaline silica sol), turn on the ultrasonic power to 99W, and continue to stir for 2 hours under ultrasonic conditions, so that the solution is fully aged and dispersed. Then the ultrasonic wave was turned off, and 16.5 ml of triethylamine (99% of analytically pure reagent content) was slowly added, and then the stirring was continued for 2 hours to make the solution gel. Then the solution was placed in a polytetrafluoro-lined high-pressure crystallization kettle, and the crystallization kettle was placed in a constant temperature drying oven for crystallization at a constant temperature of 165° C. for 24 hours. When the tempe...

Embodiment 2

[0021] Same as the preparation process of molecular sieve A, change the consumption of silica sol to 4.6ml, under the situation that other conditions are unchanged, can prepare the SAPO-34 molecular sieve of Al:P:Si=2:2:0.75, product molecular sieve is named B.

Embodiment 3

[0023] The same as the preparation process of molecular sieve A, the amount of silica sol was changed to 6.1ml, and the SAPO-34 molecular sieve of Al:P:Si=2:2:1 could be prepared under the condition of other conditions unchanged, and the product molecular sieve was named C.

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Abstract

The invention provides a process for preparing SAPO-34 molecular sieve with small crystals, which is the process for rapidly synthesizing SAPO-34 molecular sieve with small crystals under the condition of ultrasonic wave ageing. The SAPO-34 molecular sieve with small crystals prepared through the invention can be rapidly synthesized in a comparatively short time, and the synthesized molecular sieve is uniform in dispersion. The crystal size of the invention is about one half of that of SAPO-34 molecular sieve prepared by the conventional hydrothermal method. Simultaneously, the crystallization temperature and pressure of the molecular sieve synthesized by the hydrothermal method are reduced, which enables the process for preparation can be widely applied in industrial production. The molecular sieve can be used in reaction of preparing light olefins, such as ethylene, propylene and the like from conversion of methanol.

Description

technical field [0001] The invention relates to a method for preparing small-grain SAPO-34 molecular sieve, more specifically, a method for preparing small-grain SAPO-34 molecular sieve by ultrasonic aging treatment before crystallization. Background technique [0002] With the development of society, the demand for basic raw materials and energy in various sectors of industrial production has also increased significantly. The oil crisis and the need for environmental protection make the petrochemical industry begin to seek new environmentally friendly alternative energy sources. Natural gas is favored because of its abundant reserves and non-pollution, but most of it is distributed in remote areas in my country, and its effective utilization is restricted geographically. In recent years, the great progress in the field of natural gas development and utilization has made the process of natural gas-synthesis gas-methanol or dimethyl ether relatively mature, and people have f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/08C07C11/02B01J29/85C07C1/20C01B39/54
Inventor 李伟关庆鑫王小野唐珺李春刚张明慧陶克毅
Owner NANKAI UNIV