A kind of sapo-18 molecular sieve and its synthetic method and a kind of method of methanol to olefin
A technology of SAPO-18 and synthesis method, which is applied in the direction of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of unsatisfactory catalyst service life, increase production cost, reduce production efficiency, etc., and achieve shortening water consumption. Thermal crystallization time, increase production efficiency, and prolong the effect of one-way service life
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[0024] According to the first aspect of the present invention, the present invention provides a kind of synthetic method of SAPO-18 molecular sieve, and this method comprises the following steps:
[0025] (1) provide a kind of mixed solution, described mixed solution contains aluminum source, phosphorus source, silicon source, templating agent and water;
[0026] (2) aging the mixed solution;
[0027] (3) hydrothermal crystallization of the aged mixed solution;
[0028] (4) The mixture obtained by hydrothermal crystallization is subjected to solid-liquid separation, and the obtained solid phase is dried and optionally calcined.
[0029] According to the method of the present invention, the template is a composite template, comprising a first template and a second template, the first template is N,N-diisopropylamine, and the second template is At least one of triethylamine, diethylamine and isopropylamine, and the molar ratio of the first templating agent to the second templa...
Embodiment 1
[0052] 13.15g pseudo-boehmite and 29.76g deionized water are mixed and stirred, and a mixed solution of 16.60g phosphoric acid (concentration is 85wt%) and 14.88g deionized water is added with vigorous stirring, and 7.20g silica sol (SiO 2 Content is the mixed solution of 40wt%) and 14.88g deionized water. After stirring at room temperature for 1 hour, add 10.32g N,N-diisopropylethylamine (99wt%) and 8.09g triethylamine, stir for 2 hours, and age the formed jelly at room temperature (25°C) for 2 hours . The aged mixed solution was put into a stainless steel crystallization kettle, and hydrothermally crystallized at 180° C. for 96 hours. The mixture obtained by hydrothermal crystallization was filtered, and the obtained solid phase was washed with deionized water, dried at 120° C. for 5 hours, and then calcined at 650° C. for 8 hours in an air atmosphere. The obtained molecular sieve is carried out X-ray diffraction analysis (results such as figure 1 Shown), confirmed to be ...
Embodiment 2
[0054] The molecular sieve was prepared by the same method as in Example 1, except that the amount of N,N-diisopropylethylamine (99 wt%) was 18.61 g, and the amount of triethylamine was 1.62 g. The obtained molecular sieve is carried out X-ray diffraction analysis (results such as figure 1 Shown), confirmed to be SAPO-18 molecular sieve. The molecular sieve yields and relative crystallinity are listed in Table 1.
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