Process for the production of xylenes and light olefins from heavy aromatics
A technology for light alkanes and aromatics, applied in the field of xylene production, which can solve the problems of blending heavy reformed products
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Embodiment 1
[0067] Embodiment 1: prepare described catalyst
[0068] Zeolite beta (ammonium form, HSZ-940NHA, available from Japan Tosoh Chemical Co., Ltd.), SiO 2 / Al 2 o 3 The molar ratio is 37 and the BET surface area is 570m 2 / g, average particle size 6 microns and nominal Na 2 The O content is 0.05% by weight. The zeolite beta was stirred with aqueous nickel nitrate hexahydrate to ion-exchange nickel, and the resulting solid was dried and impregnated with aqueous platinum chloride to produce Ni-β-Pt according to the following procedure: Nickel nitrate hexahydrate Ni(NO 3 ) 2 ·6H 2 O was dissolved in distilled water to yield 200 mL of a 10 wt% solution. To this solution was added 30 g of uncalcined zeolite beta and stirring was continued for 1 hour, then filtered and finally washed twice to remove nitrate ions. The resulting solid was dried at room temperature for 2 hours and then oven-dried at 120°C for 3 hours. The Ni-β was then impregnated with a 0.1 wt% platinum solution...
Embodiment 2
[0069] Embodiment 2; The catalyst of test embodiment 1
[0070] The catalyst of Example 1 was tested for a transalkylation reaction using heavy reformate in a benchtop reaction system to examine the effectiveness of the catalyst for C9 conversion and product selectivity. The test procedure consisted of filling the middle of a vertical reactor with 2.0 mL of the catalyst extrudate, while the lower and upper parts of the reactor were filled with inert alumina spheres. The total reactor volume was 5 mL. The catalyst was activated and reduced at a pure hydrogen flow rate of 50 mL / min gas and maintained at a temperature of 400° C. for 2 hours. The reactor temperature was then reduced to 340 °C and 20 bar pressure and heavy reformate was supplied at a rate of 4.8 mL / h. The composition of the heavy reformate is provided in Table 6. Reactions were run at this temperature for 3 hours before samples were collected. The reaction products were then injected directly into an on-line ga...
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