SAPO-34 molecular sieve with diisopropanolamine as template, and its synthetic method

A technology of SAPO-34 and diisopropanolamine, which is applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of limited reserves of petroleum resources, unstable supply, rising prices, etc., and achieve excellent Catalytic performance, good selectivity effect

Active Publication Date: 2014-06-18
中科催化新技术(大连)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the oil route, there are problems of rising prices and unstable supply in the short term, and limited reserves of oil resources for

Method used

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  • SAPO-34 molecular sieve with diisopropanolamine as template, and its synthetic method
  • SAPO-34 molecular sieve with diisopropanolamine as template, and its synthetic method
  • SAPO-34 molecular sieve with diisopropanolamine as template, and its synthetic method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The molar proportions of each raw material, crystallization conditions and elemental composition of the samples are shown in Table 1. The specific batching process is as follows, 42.5g diisopropanolamine and 7.1g deionized water are mixed and stirred evenly, then add 5.6g pseudoboehmite (Al 2 o 3 Mass percentage composition 72.5%) stir evenly, then 9.12g phosphoric acid (H 3 PO 4 mass percent content 85%) dropwise into, stir evenly, finally add 1.59g silica sol (SiO 2 mass percentage 30.34%), stirred evenly to make a gel, and the gel was transferred to a stainless steel reaction kettle. The molar ratio of each component in the synthesis system is 8.0DIPA:0.20SiO 2 : 1Al 2 o 3 : 1P 2 o 5 : 15H 2 O.

[0043] After putting the reaction kettle into the oven, the temperature was programmed to 200°C for dynamic crystallization for 48 hours. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain the original powder....

Embodiment 2-19

[0051] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as in Example 1.

[0052] Synthetic samples were analyzed by XRD, and the data results were close to those in Table 2, that is, the peak positions and shapes were the same, and the relative peak intensity of the peaks fluctuated in the range of ±10% according to the change of the synthesis conditions, indicating that the synthetic products had the characteristics of the SAPO-34 structure. The results of elemental composition analysis of the product are shown in Table 1.

[0053] Carry out to the former powder sample of embodiment 1-10 13 C MAS NMR analysis by diisopropanolamine 13 The C MAS NMR standard spectrum was compared, and it was found that only the resonance peak of diisopropanolamine was found in the sample.

Embodiment 20

[0055] The sample obtained in Example 1 was calcined at 550° C. for 4 hours, and then pressed into tablets and crushed to 20-40 meshes. Weigh 5.0 g of the sample and put it into a tank reactor filled with 30 ml of ethanol to carry out ethanol dehydration reaction. The reaction temperature was set at 150° C., and the reaction was carried out under stirring. The reaction results show that the conversion rate of ethanol can reach 90%, and the selectivity of ether in the product is 90%.

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Abstract

The invention provides an SAPO-34 molecular sieve. The anhydrous chemical composition of the molecular sieve is mDIPA.(SixAlyPz)O2, wherein DIPA is N-methyldiethanolamine and is distributed in the cage and tunnels of a molecular sieve; m is the mole number of the diisopropanolamine template in each mole of (SixAlyPz)O2, and is in a range of 0.03-0.25; and x, y and z represent the mole fractions of Si, Al and P respectively, x is in a range of 0.01-0.30, y is in a range of 0.40-0.60, z is in a range of 0.25-0.49, and the value of x+y+z is 1. The above Si-P-Al molecular sieve SAPO-34 synthesized in the invention can be used as a catalyst for acid catalysis reactions, like a methanol-to-olefin reaction. The invention also relates to an application of the SAPO-34 molecular sieve in CH4 and CO2 adsorbing separation.

Description

technical field [0001] The invention belongs to the field of SAPO molecular sieves, in particular to a SAPO-34 molecular sieve and a synthesis method thereof. Background technique [0002] Low-carbon olefins, especially ethylene and propylene, are basic organic raw materials in the chemical industry, and their demand is increasing. The production methods of light olefins can be divided into two categories: one is the petroleum route, and the other is the non-petroleum route. For the oil route, there are problems of rising prices and unstable supply in the short term, and limited reserves of oil resources for a long time. Therefore, it is not enough to increase the production of low-carbon olefins only by relying on the traditional oil route. Methanol to Olefine (MTO for short) is a process in which coal or natural gas is used as raw material to produce ethylene, propylene and other low-carbon olefins from methanol, and it is the most promising non-petroleum route process. ...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08
Inventor 王德花田鹏刘中民樊栋张莹袁扬扬
Owner 中科催化新技术(大连)股份有限公司
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