Synthesis method of SAPO-34 molecular sieve, synthesized molecular sieve and application thereof
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A technology of SAPO-34 and synthesis method, applied in the synthesis field of SAPO-34 molecular sieve, can solve the problems of low molecular sieve yield and poor product quality, etc.
Active Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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[0008] Aiming at the problems of low molecular sieve yield and poor product quality in the gas phase method in the prior art...
Method used
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[0036] The present invention relates to a kind of synthetic method of SAPO-34 molecular sieve, comprising:
[0037] a) hydrothermally crystallizing a mixture I comprising a silicon source, a phosphorus source, an aluminum source, a templating agent and water to obtain a directing agent A comprising a crystal seed;
[0038] b) Make the mixture II formed by the phosphorus source, the aluminum source, the silicon source and water to make silicon-phosphor-aluminum dry glue B;
[0039] c) Adding the silicon-phosphor-aluminum dry glue B to the directing agent A to obtain the mixture III;
[0040] d) Mixture III undergoes hydrothermal treatment and hydrothermal crystallization to prepare SAPO-34 molecular sieve.
[0041] According to one aspect of the present invention, non-limiting examples of the silicon source include at least one of silicate, white carbon black, tetraalkyl silicate, silica sol, silicic acid, and alkali metal silicate. The preferred silicon source is at least on...
Embodiment 1
[0076] Step a), 12.1 g γAl 2 o 3 Mix uniformly with 30.0 gram deionized water to form solution a; 23.1 gram phosphoric acid (85% by weight), 35.0 gram deionized water mix homogeneously to form solution b; A and b are mixed and stirred at room temperature for 2 hours to form homogeneous solution c; keep Stirring, add 31 grams of triethylamine, 3.0 grams of silica sol (SiO 2 The mass content is 40%) and 27.0 grams of deionized water, and the mixture I was obtained after being fully stirred; the mixture I was crystallized at 200° C. for 6 hours to obtain the directing agent A containing large-grain nascent crystals.
[0077] Step b), 12.1 grams of γ-Al 2 o 3 Mix evenly with 20.0 gram deionized water to form solution a; 23.1 gram phosphoric acid (85% by weight), 10.0 gram deionized water mix homogeneously to form solution b; a and b are mixed and stirred at room temperature for 2 hours to form homogeneous solution c; keep Stirring, add 3.0 g of silica sol (SiO 2 mass content ...
Embodiment 2
[0081] Same as [Example 1], but aluminum phosphate dry glue B weighs 5.0 grams, and the final product weighs 23.1 grams.
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Abstract
The invention discloses a synthesis method of an SAPO-34 molecular sieve, a synthesized molecular sieve and an application thereof in a reaction for preparing olefin from an oxygen-containing compound. The method comprises the following steps: carrying out hydrothermal crystallization on a mixture I formed by a silicon source, a phosphorus source, an aluminum source, a template agent and water to obtain a guiding agent A containing a seed crystal; preparing a mixture II from a phosphorus source, an aluminum source, a silicon source and water to prepare silicon-phosphorus-aluminum dry glue B; mixing the silicon-phosphorus-aluminum dry glue B with a guiding agent A to obtain a mixture III; and carrying out hydrothermal treatment on the mixture III at 140-170DEG C for 0.1-12h, and carrying out hydrothermal crystallization at 180-220DEG C for 2-48h to obtain the SAPO-34 molecular sieve. By adopting the synthesis method disclosed by the invention, the yield of the molecular sieve is high, the synthesized SAPO-34 molecular sieve is high in crystallinity and good in product quality, and the SAPO-34 molecular sieve has the advantage of high yield of low-carbon olefin when being used in the reaction of preparing olefin from an oxygen-containing compound.
Description
technical field [0001] The invention relates to a synthesis method of SAPO-34 molecular sieve, the synthesized molecular sieve and its application. Background technique [0002] Ethylene and propylene are important basic raw materials of modern petrochemical industry. The traditional production methods of ethylene and propylene rely on petroleum raw materials, combined with the actual distribution of fossil energy in China that is "rich in coal, poor in gas, and low in oil", to improve and transform the production level of China's coal chemical industry, and to develop new coal chemical technology is in line with China's national security and energy strategy. The route of methanol to olefins has attracted extensive attention because the feedstock can be obtained from synthesis gas in large quantities, cheaply and conveniently. Therefore, it is of great significance to obtain high yields of ethylene and propylene from methanol conversion. [0003] The core of methanol-to-ol...
Claims
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