ZSM-5 sieve material used for aromatic hydrocarbons alkylation reaction and preparation method thereof
A ZSM-5, aromatic hydrocarbon alkylation technology, applied in the direction of condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, organic chemistry, borane silicone crystalline aluminum silicate zeolite, etc., can solve the stability of aromatic hydrocarbon alkylation reaction problems such as poor performance and low recovery rate of fine particle zeolite molecular sieves, to achieve the effect of improved catalyst stability, high recovery rate and good activity stability
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Embodiment 1
[0017] Prepare the zeolite precursor in advance: take ethylamine as template agent, use silica sol (40% by weight aqueous solution) and sodium aluminate as silicon source and aluminum source respectively, according to Al 2 o 3 : 100SiO2 2 : 6CH 3 CH 2 NH 2 :80H 2 The mixture was prepared in a molar ratio of O, and the pH value of the system was adjusted to 12.5 with sodium hydroxide, and then hydrothermally reacted at 170° C. for 24 hours.
[0018] Water glass (containing 25.3% by weight SiO 2 ) and aluminum sulfate as silicon source and aluminum source, with tetrapropylammonium bromide (R) as template, with concentrated sulfuric acid to adjust the pH value of the system, according to 12Na 2 O:Al 2 o 3 : 120SiO2 2 : 13R 2 O: 650H 2 The crystallization mother liquor was prepared according to the molar ratio of O, and 5% by weight of zeolite precursor was added to the crystallization reaction mother liquor, and static crystallization was carried out at 180° C. for 48 ...
Embodiment 2
[0020] Prepare the zeolite precursor in advance: use n-butylamine as the template, use silicon powder and sodium aluminate as the source of silicon and aluminum respectively, according to Al 2 o 3 : 200 SiO 2 : 4CH 3 CH 2 CH 2 CH 2 NH 2 : 350H 2The mixture was prepared at a molar ratio of O, and the pH value of the system was adjusted to 12.5 with sodium hydroxide, and then hydrothermally reacted at 175° C. for 36 hours.
[0021] Respectively with silica sol (containing 40% by weight SiO 2 ) and aluminum nitrate as silicon source and aluminum source, with tetrapropyl ammonium hydroxide (R) as template, with sodium hydroxide to adjust the pH value of the system, according to 10Na 2 O:Al 2 o 3 : 180SiO 2 :3R 2 O: 400H 2 The molar ratio of O was used to prepare the crystallization mother liquor, and 6% by weight of zeolite precursor was added to the crystallization reaction mother liquor, and static crystallization was carried out at 160° C. for 36 hours. The XRD pa...
Embodiment 3
[0023] Prepare the zeolite precursor in advance: use tetrapropylammonium hydroxide as the template agent (R), use tetraethyl orthosilicate as the silicon source, and follow the 3SiO 2 : 2R 2 O: 50H 2 The mixture was prepared at a molar ratio of O, and the pH value of the system was adjusted to 12.5 with ammonia water, and then hydrothermally reacted at 120° C. for 12 hours.
[0024] Respectively with silica sol (containing 40% by weight SiO 2 ) and sodium aluminate as silicon source and aluminum source, with tetrapropylammonium bromide (R) as template, with sodium hydroxide to adjust the pH value of the system, according to 6Na 2 O:Al 2 o 3 : 260SiO2 2 : 12R 2 O: 360H 2 The crystallization mother liquor was prepared according to the molar ratio of O, 1% by weight of zeolite precursor was added to the crystallization reaction mother liquor, and static crystallization was carried out at 130° C. for 96 hours. The XRD pattern of the product shows that it has a ZSM-5 struct...
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