Alkyl arene isomerizing method
A technology for isomerization of aromatics and alkylaromatics, applied in the field of isomerization of alkylaromatics, to achieve the effect of increasing yield
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[0021] The preparation method of the catalyst of the present invention is as follows: first mix the sodium-type high-silicon five-membered ring zeolite and / or mordenite with the binder evenly, and add 20-80% of the total mass of the mixed powder, preferably 30-60% The dilute nitric acid is kneaded, shaped and dried, and the concentration of the dilute nitric acid is 1-5% by mass, preferably 1.5-3.5% by mass. The shaped and dried solid is calcined in air at 470-650°C, preferably 500-600°C. Then exchange the sodium ions with ammonium salt solution, filter, wash, dry and roast to obtain the catalyst. The ammonium exchange temperature is 25-120°C, preferably 85-100°C. The ammonium salt used for ammonium exchange is preferably ammonium chloride or ammonium nitrate, and its concentration is 1 to 30% by mass, preferably 3 to 10% by mass.
[0022] The ammonium-exchanged solid is impregnated with a water-soluble compound solution containing Group VIII metals to introduce Group VIII m...
example 1
[0026] (1) Preparation of carrier
[0027] Take SiO 2 / Al 2 o 3 ZSM-5 and alumina powder with a molar ratio of 140 were mixed at a dry basis mass ratio of 70:30. Add 40% of the total mass of the powder with a concentration of 2% nitric acid aqueous solution, knead and knead, dry at 120°C for 2 hours, and roast in air at 600°C for 3 hours to obtain a carrier, which contains 9.5% by mass of ZSM-5 and 30.5% by mass of alumina .
[0028] (2) Preparation of catalyst
[0029] Get the carrier that 100 grams (1) step makes, use the NH that concentration is 3.0 mass % 4 The Cl aqueous solution was ion-exchanged at 80°C for 2 hours, and the obtained solid was washed with deionized water until there was no Cl in the solution. -, then with chloroplatinic acid solution by liquid / solid volume ratio of 2: 1 ratio of immersion for 12 hours, the platinum content in the chloroplatinic acid solution should make the platinum content in the final catalyst be 0.04 mass % (based on the carri...
example 2
[0031] (1) Preparation of carrier
[0032] Take SiO 2 / Al 2 o 3 ZSM-5 with a molar ratio of 60, SiO 2 / Al 2 o 3 The mordenite and alumina powders with a molar ratio of 12 were mixed uniformly at a dry basis mass ratio of 40:3:57. Add 40% of the total mass of the powder with a concentration of 2% nitric acid aqueous solution, knead and knead, dry at 120°C for 2 hours, and roast in air at 600°C for 3 hours to obtain carrier B, which contains 40.2% by mass of ZSM-5 and 2.9% by mass of mordenite %, alumina 56.9% by mass.
[0033] (2) Get 100 grams of the carrier prepared in step (1), carry out ammonium exchange and load platinum according to the method of step 1 (2) of Example 1, and prepare catalyst B, whose platinum content is 0.04% by mass.
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