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Method for preparing silicoaluminophosphate molecular sieve, silicoaluminophosphate molecular sieve and methanol-to-olefin method

A technology of silicoaluminophosphate and molecular sieve, which is applied in the field of catalysis, can solve the problems of large sewage discharge, low molecular sieve yield, and reduce water consumption, and achieve the effects of reducing discharge, easy storage, and reducing preparation cost.

Active Publication Date: 2020-10-27
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the existing technology in the industrial production of silica sol, phosphoric acid and other liquid raw materials for the preparation of silicoaluminophosphate molecular sieves, which are not easy to store due to the influence of temperature and weather, large sewage discharge, and low molecular sieve yield. A method for preparing a silicoaluminophosphate molecular sieve, a silicoaluminophosphate molecular sieve prepared by the above method, and a method for producing olefins from methanol, the method for preparing a silicoaluminophosphate molecular sieve has the advantages of easy industrial application, easy storage of raw materials, and reduction in the crystallization process. Water consumption, increase the yield of molecular sieve, greatly reduce the discharge of crystallization liquid sewage, reduce the preparation cost of catalyst, etc.

Method used

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  • Method for preparing silicoaluminophosphate molecular sieve, silicoaluminophosphate molecular sieve and methanol-to-olefin method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1) Add 7.25g of pseudo-boehmite into 9.89g of deionized water, and after stirring evenly, add 5.41g of phosphoric acid (85%) and 5.63g of silica sol dropwise, and continue to stir for 1h. molar ratio to Al 2 o 3 :P 2 o 5 : SiO 2 :H 2 O=1:0.5:0.6:20. The mixture was dried overnight in an oven at 80°C.

[0053] 2) Grinding the dried silicon phosphorus aluminum dry rubber to obtain silicon phosphorus aluminum dry rubber powder. The obtained silicon phosphorus aluminum dry rubber powder was mixed with 3.73 g of phosphoric acid and 20.03 g of deionized water, and activated at 60° C. for 4 hours.

[0054] 3) Cool the treated mixed solution to room temperature, add 10.00 g of triethylamine, stir for 1 h, then transfer to a hydrothermal crystallization kettle for hydrothermal crystallization at 190° C. for 24 h. The obtained product was centrifugally washed with deionized water, filtered and dried, and then calcined at 550° C. for 8 hours in an air atmosphere to obtain ...

Embodiment 2

[0057] 1) Add 7.25g of pseudo-boehmite to 15.60g of deionized water, and after stirring evenly, add 10.82g of phosphoric acid (85%) and 4.69g of silica sol dropwise, and continue to stir for 1 hour, and each component material in the obtained mixture molar ratio to Al 2 o 3 :P 2 o 5 : SiO 2 :H 2 O=1:1:0.5:27. The mixture was dried overnight in an oven at 60°C.

[0058] 2) Grinding the dried silicon phosphorus aluminum dry rubber to obtain silicon phosphorus aluminum dry rubber powder. The obtained silicon phosphorus aluminum dry rubber powder was mixed with 1.12 g of phosphoric acid and 15.70 g of deionized water, and activated at 80° C. for 4 hours.

[0059] 3) Cool the treated mixed solution to room temperature, add 13.85 g of triethylamine, stir for 1 h, then transfer to a hydrothermal crystallization kettle for hydrothermal crystallization at 200° C. for 24 h. The obtained product was centrifugally washed with deionized water, filtered and dried, and then calcined ...

Embodiment 3

[0062] 1) Mix and stir 9.58g of aluminum isopropoxide, 13.38g of phosphoric acid (85%) and 13.25g of deionized water respectively. After stirring evenly, add 5.63g of silica sol dropwise, and continue stirring for 1 hour. molar ratio to Al 2 o 3 :P 2 o 5 : SiO 2 :H 2 O=1:1.2:0.6:23. The mixture was dried overnight in an oven at 60°C.

[0063] 2) Grinding the dried silicon phosphorus aluminum dry rubber to obtain silicon phosphorus aluminum dry rubber powder. The obtained silicon phosphorus aluminum dry rubber powder was mixed with 2.46 g of phosphoric acid and 18.19 g of deionized water, and activated at 80° C. for 4 hours.

[0064] 3) Cool the treated mixed solution to room temperature, add 11.25 g of triethylamine and 1.55 g of diethylamine, stir for 1 hour, then transfer to a hydrothermal crystallization kettle for hydrothermal crystallization at 200° C. for 24 hours. The obtained product was centrifugally washed with deionized water, filtered and dried, and then ca...

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Abstract

The invention relates to the field of catalyzing, and discloses a method for preparing a phosphoric acid silicon-aluminum molecular sieve, the phosphoric acid silicon-aluminum molecular sieve preparedthrough the method and a method for preparing olefin from methanol. In the method for preparing the phosphoric acid silicon-aluminum molecular sieve, silicon-phosphate-aluminum dry glue powder is used as a crystallized initial raw material of the molecular sieve and is easy to store, and the problems are solved in that in current industrial product, silica sol, phosphoric acid and other liquid raw materials are difficult to store under the influences of temperature and weather; meanwhile, during crystallization, the usage amount of water is reduced, the yield of the molecular sieve is increased, accordingly, the amount of discharged crystallization liquid sewage is decreased greatly, and the cost for preparing the phosphoric acid silicon-aluminum molecular sieve is lowered. The phosphoricacid silicon-aluminum molecular sieve prepared through the method shows excellent catalyzing performance when used for a reaction of catalyzing methanol to prepare olefin.

Description

technical field [0001] The invention relates to the field of catalysis, in particular to a method for preparing silicoaluminophosphate molecular sieve, the silicoaluminophosphate molecular sieve prepared by the above method and a method for preparing olefins from methanol. Background technique [0002] my country's energy structure is characterized by rich coal, poor oil, and little gas. It is a country with relatively insufficient oil resources. At present, my country has become the largest coal producer and consumer in the world. This coal-dominated energy pattern will not change significantly for a long time to come. The shortage of petroleum resources has become one of the main bottlenecks restricting the development of my country's olefin industry. Petrochemical routes to develop various alternative petroleum resources using natural gas or coal as raw materials have been in progress. Among them, the technical progress of the MTO process is very beneficial to accelerat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 郭磊朱伟平李飞郭智慧尹琪
Owner CHNA ENERGY INVESTMENT CORP LTD
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