C8 aromatic isomerization-separation coupling reaction method
A kind of aromatic hydrocarbon isomerization and coupling reaction technology, applied in the field of alkyl aromatic hydrocarbon isomerization, can solve problems such as xylene loss, and achieve the effect of good adsorption isomerization reaction performance
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[0032] The preparation method of the phosphorus-modified molecular sieve of the present invention comprises: impregnating the hydrogen-type molecular sieve with a phosphorus-containing compound solution dissolved in water. The impregnation pressure is preferably 0.1-1.0 MPa, the impregnation temperature is preferably 75-180°C, the liquid / solid volume ratio of the impregnation liquid to the molecular sieve is 0.7-3.0, and the impregnation time is preferably 5-24 hours. The solid obtained after impregnation is dried and calcined to obtain phosphorus-modified molecular sieves. The phosphorus-containing compound used for impregnation is selected from one or more of ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, aluminum phosphate, phosphoric anhydride, phosphorous acid, ammonium phosphite and phosphoric acid.
[0033] In the preparation method of the phosphorus and magnesium composite modified molecular sieve, the molecular sieve is preferably fi...
example 1
[0049] The following example prepares the phosphorus modified catalyst of the present invention.
[0050] Prepare 500ml with P 2 o 5 Add 450 grams of HZSM-5 molecular sieve with a silicon oxide / alumina molar ratio of 80 and a crystallinity of 85% to an aqueous solution of ammonium dihydrogen phosphate with a calculated phosphorus content of 5% by mass, and impregnate it at 120°C and 0.5MPa After 20 hours, the filtered solid was dried at 120°C for 8 hours, and calcined at 550°C for 5 hours in an air atmosphere to obtain P 2 o 5 HZSM-5 molecular sieve Z-1 with a content of 4.5% by mass.
[0051] Mix the above-mentioned phosphorus-modified molecular sieve Z-1 with alumina at a mass ratio of 85:15, add 4 mass% nitric acid aqueous solution at a solid / liquid mass ratio of 3:1, knead, extrude, and dry at 120°C After 6 hours, it was pelletized and calcined at 550°C for 6 hours to obtain catalyst A-1.
example 2
[0053] Prepare the phosphorus-modified HZSM-5 molecular sieve according to the method of example 1, the difference is that in the ammonium dihydrogen phosphate aqueous solution used, P 2 o 5 The calculated phosphorus content is 14% by mass, and P 2 o 5 HZSM-5 molecular sieve Z-2 with a content of 13.5% by mass.
[0054] Molecular sieve Z-2 was mixed with alumina at a mass ratio of 90:10, and then kneaded, extruded, dried and calcined according to the method of Example 1 to obtain catalyst A-2.
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