Method for Producing Aromatic Hydrocarbons Using Catalytic Cracking Gasoline
A technology for catalytic cracking of gasoline and aromatics, which is applied in the fields of hydrocarbon oil treatment products, hydrocarbon oil treatment, petroleum industry, etc. It can solve the problems that cannot be converted into chemical products, etc., achieve good industrial scale-up adaptability, save production energy consumption, and benzene content low effect
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Embodiment 1
[0067] 1. Preparation of aromatization catalyst
[0068] 1) Preparation of catalyst precursor
[0069] At room temperature, the nanoscale HZSM-5 molecular sieve with a silicon-to-aluminum ratio of 25 and pseudo-boehmite were physically mixed in a ratio of 4:1 to obtain a catalyst precursor.
[0070] 2) Ion exchange modification
[0071] The catalyst precursor was ion-exchanged by the constant temperature water bath method, specifically, sodium hydroxide was dissolved in deionized water, mixed with the catalyst precursor and placed in a water bath at 90°C for 2 hours, so that the loading capacity of sodium was about 0.2 % by weight, followed by drying at about 120°C for about 8 hours and firing at about 540°C for about 4 hours.
[0072] 3) The first modification treatment
[0073] Using the equal-volume impregnation method, the first modification treatment is carried out on the catalyst precursor treated by ion exchange, specifically, dissolving ammonium dihydrogen phosphate...
Embodiment 2
[0091] 1. Preparation of aromatization catalyst
[0092] 1) Preparation of catalyst precursor
[0093] At room temperature, the nanoscale HZSM-5 molecular sieve with a silicon-to-aluminum ratio of 25 and pseudo-boehmite were physically mixed at a ratio of 9:1 to obtain a catalyst precursor.
[0094] 2) Ion exchange modification
[0095] The catalyst precursor was ion-exchanged by using a constant temperature water bath method, specifically dissolving sodium hydroxide in deionized water, mixing it with the catalyst precursor, and stirring it in a water bath at 90°C for 2 hours, so that the loading capacity of sodium was about 0.5 % by weight, followed by drying at about 120°C for about 8 hours and firing at about 540°C for about 4 hours.
[0096] 3) The first modification treatment
[0097] Using an equal-volume impregnation method, carry out the first modification treatment on the ion-exchange-treated catalyst precursor, specifically dissolving lanthanum nitrate in deionize...
Embodiment 3
[0113] like image 3 As shown, the method of utilizing catalytic cracking gasoline to produce aromatics in the present embodiment comprises the following steps:
[0114] 1. Prehydrogenation
[0115] The composition of the catalytic cracking gasoline raw material in this embodiment is shown in Table 5.
[0116] Table 5 Composition of catalytic cracking gasoline feedstock
[0117]
[0118] In the presence of a pre-hydrogenation catalyst, the above catalytic cracked gasoline is pre-hydrogenated to obtain a pre-hydrogenation catalytic cracked gasoline; wherein the pre-hydrogenation catalyst is a nickel-molybdenum bimetallic catalyst, which consists of (mass content%): Al 2 o 3 90.5%, Ni6%, Mo 3.5%; the pre-hydrogenation process conditions are: control the reaction temperature at 130°C, the hydrogen-oil ratio is 5, and the volume space velocity is 3h -1 .
[0119] After the above-mentioned pre-hydrogenation, the light sulfur compounds in the catalytic cracking gasoline rea...
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