ZSM-22/ZSM-23 composite molecular sieve and preparation method
A composite molecular sieve, ZSM-23 technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve problems such as ineffectiveness, and achieve the effect of low pour point, good synergistic effect and high viscosity index
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Embodiment 1
[0073] 4.4 g NaAlO 2 (Al 2 o 3 36.3%, Na 2 (22.5%) was added in the mixture of 4.1 gram NaOH and 474 gram water, stirred 4 hours, then added the sodium type ZSM-22 molecular sieve synthesized by 15 gram comparative examples, stirred 3 hours, added 66 gram pyrrolidine, stirred 1 Hour, finally add 261.1 grams of 30% silica sol to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =83, R / SiO 2 =0.7,OH - / SiO 2 =0.08,H 2 O / SiO 2 =25, the addition of ZSM-22 molecular sieve is 0.2 of the silica weight. After stirring for 12 hours, it was transferred to a 1000 ml autoclave, and after sealing, the stirring speed was adjusted to 300 rpm, and the temperature was raised to 165° C. in 4 hours, followed by hydrothermal crystallization for 72 hours. After the crystallization was completed, the autoclave was placed in water for rapid cooling, the product was filtered and washed until the pH of the filtrate was neutral, and then dried at 1...
Embodiment 2
[0075] 6.1 g NaAlO 2 (Al 2 o 3 36.3%, Na 2 (22.5%) was added in the mixture of 4.1 gram NaOH and 1232 gram water, stirred 4 hours, then added the hydrogen type ZSM-22 molecular sieve synthesized by 45 gram comparative example, stirred 3 hours, added 283 gram pyrrolidine, stirred 1 Hour, finally add 261.1 grams of 30% silica sol to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =60, R / SiO 2 =3,OH - / SiO 2 =0.08, H 2 O / SiO 2 =65, the addition of ZSM-22 molecular sieve is 0.6 of the silica weight. After stirring for 12 hours, it was transferred to a 2000 ml high-pressure reactor. After sealing, the stirring speed was adjusted to 300 rpm, and the temperature was raised to 165° C. in 4 hours, and hydrothermal crystallization was carried out for 72 hours. After the crystallization was completed, the autoclave was placed in water for rapid cooling, the product was filtered and washed until the pH of the filtrate was neutral, a...
Embodiment 3
[0077] 1.2 g NaAlO 2 (Al 2 o 3 36.3%, Na 2 (2.5%) was added in the mixture of 25.6 gram NaOH and 474 gram water, stirred 4 hours, then added the sodium type ZSM-22 molecular sieve synthesized by 0.75 gram comparative example, stirred 3 hours, added 4.7 gram pyrrolidine, stirred 1 Hour, finally add 261.1 grams of 30% silica sol to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =300, R / SiO 2 =0.05,OH - / SiO 2 =0.5,H 2 O / SiO 2 =25, the addition of ZSM-22 molecular sieve is 0.01 of the silica weight. After stirring for 12 hours, it was transferred to a 1000 ml autoclave, and after sealing, the stirring speed was adjusted to 300 rpm, and the temperature was raised to 165° C. in 4 hours, followed by hydrothermal crystallization for 72 hours. After the crystallization was completed, the autoclave was placed in water for rapid cooling, the product was filtered and washed until the pH of the filtrate was neutral, and then dried ...
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