Method for preparing xylene through arene alkylation
A technology for paraxylene and an alkylating agent is applied in the field of aromatic hydrocarbon alkylation reaction to prepare xylene, and can solve the problems of low methanol conversion rate of catalyst, low xylene concentration, and high energy and material consumption.
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Embodiment 1～4
[0029] use Na 2 O content less than 0.15% (weight), SiO2 / Al 2 o 3 66.7 grams of ammonium ZSM-5 powder with a molecular ratio of 260 and Na 2 α-Al with an O content of less than 0.15% by weight 2 o 3 ·H 2 057.1 grams are evenly mixed, then chemically pure dilute nitric acid solution and chemically pure lanthanum nitrate are made into an aqueous solution and fully kneaded, extruded, roasted, then impregnated with magnesium acetate solution to make catalyst B.
[0030] A multi-bed fixed-bed reactor is used, and 10g of self-made molecular sieve catalyst is loaded, and the alkylation reagent stream is dispersed into multi-stage streams of equal or unequal amounts. At room temperature, multiple injection ports enter different beds of the fixed-bed reactor respectively . That is, after the heat-exchanged aromatics flow is fully mixed with the first-stage alkylation agent flow and water vapor layer at room temperature, it enters the first catalyst bed layer of the reactor, and ...
Embodiment 5～8
[0032] use Na 2 O content less than 0.15% (weight), SiO 2 / Al 2 o 3 60.7 grams of ammonium type MCM-22 powder with a molecular ratio of 50, 6.0 grams of magnesium aluminum spinel and Na 2 α-Al with an O content of less than 0.15% by weight 2 o 3 ·H 2 O27.1 g is uniformly mixed, then chemically pure dilute nitric acid solution and chloroplatinic acid aqueous solution are fully kneaded, extruded, roasted, and then impregnated with ammonium phosphate solution to make catalyst C.
[0033] Use multi-stage fixed-bed reactors connected in series, and load 10g of self-made molecular sieve catalysts. The alkylation reagent stream is dispersed into multiple streams of equal or unequal amounts at room temperature, and enter the multi-stage series fixed-bed reactors respectively through multiple injection ports. After the aromatic hydrocarbon stream is mixed with the first alkylating reagent stream at normal temperature and steam in the inert layer of the first stage reactor, after ...
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