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Preparation method of SAPO-56 molecular sieve

A technology of SAPO-56 and molecular sieves, which is applied in the field of preparation of SAPO-56 molecular sieves, can solve the problems of large molecular sieve grains, low crystallinity, and high synthesis cost, and achieve uniform particle size and good technical effects

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that there is high synthetic cost of SAPO-56 molecular sieve in the prior art, the synthetic molecular sieve grain is larger, and the problem of crystallinity is lower, a kind of new preparation method of SAPO-56 molecular sieve is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After mixing 7.0g of raw material phosphoric acid (85% aqueous solution) and 43.1g deionized water, stir evenly, add 8.3gTMHD solution and 4.8g cyclohexylamine under stirring, add silica sol (containing SiO 2 30%) 4.2g, after stirring and reacting to form a gel, finally 6.9g of pseudo-boehmite was slowly added to the above-mentioned gel, and the stirring was continued to form a gel reaction mixture. Put the above reaction mixture into a crystallization kettle with a polytetrafluoroethylene liner, crystallize at 200°C under autogenous pressure for 48 hours, and finally wash the crystallized product with deionized water, filter, and dry in air at 100°C Dry, the obtained product is analyzed by XRD diffraction to be SAPO-56 molecular sieve, the relative crystallinity is 95%, and the crystal particle size is 5.5 μ m.

Embodiment 2

[0022] After mixing 6.5g of raw material phosphoric acid (85% aqueous solution) and 43.1g deionized water, stir evenly, add 8.3gTMHD solution and 4.9g di-n-propylamine under stirring, add silica sol (containing SiO 2 30%) 4.3g, after stirring and reacting to form a gel, finally 6.9g of pseudo-boehmite was slowly added to the above gel, and the stirring was continued to form a gel reaction mixture. Put the above reaction mixture into a crystallization kettle with a polytetrafluoroethylene liner, crystallize at 200°C under autogenous pressure for 56 hours, and finally wash the crystallized product with deionized water, filter, and dry in air at 100°C After drying, the obtained product was analyzed by XRD diffraction to be SAPO-56 molecular sieve, with a relative crystallinity of 92% and a crystal particle size of 5.0 μm.

Embodiment 3

[0024] After mixing 7.0g of raw material phosphoric acid (85% aqueous solution) and 43.1g deionized water, stir evenly, add 8.3gTMHD solution and 28.3g tetraethylammonium hydroxide solution under stirring, add silica sol (containing SiO 2 30%) 6.4g, after stirring and reacting to form a gel, finally 6.9g of pseudo-boehmite was slowly added to the above gel, and the stirring was continued to form a gel reaction mixture. Put the above reaction mixture into a crystallization kettle with a polytetrafluoroethylene liner, crystallize at 200°C under autogenous pressure for 48 hours, and finally wash the crystallized product with deionized water, filter, and dry in air at 100°C Dry, the obtained product is analyzed by XRD diffraction to be SAPO-56 molecular sieve, the relative crystallinity is 98%, and the crystal particle size is 4.8 μm.

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Abstract

The invention relates to a preparation method of an SAPO-56 molecular sieve which solves the problems that the SAPO-56 molecular sieve synthesized by the existing technology is low in relative crystallinity, large in molecular sieve crystal grain and high in synthesizing cost. A compound template consisting of N, N, N', N'-tetramethyl-1, 6-hexamethylenediamine and at least one of di-n-propylamine, tetraethylammonium hydroxide, cyclohexylamine and triethylamine is added in the process of preparing a colloid mixture, wherein the dose of the N,N,N',N'-tetramethyl-1,6-hexamethylenediamine solves the problem according to the technological project that the N,N,N',N'-tetramethyl-1,6-hexamethylenediamine takes up to 10-90% of the dose of the compound template, so that the preparation method can be applicable to the industrial production of preparing a low-carbon olefin catalyst through methanol.

Description

technical field [0001] The present invention relates to a kind of preparation method of silicon phosphorus aluminum molecular sieve, particularly relate to a kind of use N,N,N,'N,'-tetramethyl-1,6-hexamethylenediamine and other organic amines as compound template agent, synthesize The preparation method of SAPO-56 molecular sieve with ATX structure is presented. Background technique [0002] AlPO was first reported by Union Carbide 4 Synthesis of molecular sieves. which consists of AlO 4 - and PO 4 + The tetrahedron is alternately composed, and the whole framework is electrically neutral, without ion exchange performance and strong acidity. SAPO molecular sieve can be regarded as silicon substitution into AlPO 4 The intervention of silicon formed after the framework makes the framework of SAPO molecular sieves negatively charged and has exchangeable cations. According to the synthesis conditions and the change of the amount of silicon in the sample, SAPO molecular sie...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54
Inventor 赵昱刘红星钱坤管洪波
Owner CHINA PETROLEUM & CHEM CORP
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