Method for producing aromatic hydrocarbons by aromatization of lactone compounds
An ester compound and aromatization technology is applied in the field of aromatization of lactone compounds to produce aromatic hydrocarbons to achieve the effects of avoiding rapid deactivation, avoiding rapid carbon deposition and improving yield
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Embodiment 1
[0030] Weigh 35 grams of ZSM-5 with a silicon-aluminum ratio of 25 and mix it with 35 grams of γ-alumina additive, add 2.7 grams of scallop powder, and mix well. Then add 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5%, knead and shape, and extrude. The obtained catalyst precursor was dried at 120°C for 8 hours, calcined at 500°C for 2 hours, and impregnated with Zn(NO 3 ) 2 , the added amount of Zn is 1%, dried and calcined to obtain molecular sieve catalyst C1.
[0031] Weigh 60 grams of corn stalks, place in an autoclave and add 700 grams of water, then add a 5mol / L sulfuric acid solution with 7% water quality, heat up to 180°C and react for 45 minutes, then cool, and the cooled reaction solution Filtrate to obtain filter cake and filtrate, the filtrate is the hydrolyzate of cellulose, after the reaction, the mass spectrometry is used to identify the reaction result. The main product is levulinic acid, and its production amount is 18...
Embodiment 2
[0035] Weigh 35 grams of ZSM-5 with a silicon-aluminum ratio of 50 and mix them with 35 grams of pseudo-boehmite, add 2.7 grams of celadon powder, and mix well. Then add 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5%, knead and shape, and extrude. The obtained catalyst precursor was dried at 120°C for 8 hours, calcined at 500°C for 2 hours, and impregnated with Cu(NO 3 ) 2 , the amount of Cu added is 2%, and the molecular sieve catalyst C2 is obtained by roasting after drying.
[0036] Catalyst activity evaluation is carried out on a fixed bed. The reaction conditions are that the catalyst mass is 3 grams, the reaction substrate is γ-valerolactone, and the weight space velocity is 4.0 hours. -1 , hydrogen pressure 1.0MPa, flow 50ml min -1 , temperature 400°C.
[0037] After the reaction, the conversion rate of the reaction substrate was 93%, the selectivity of BTX was 78%, and the carbon deposition percentage C%=7%.
Embodiment 3
[0039] Weigh 35 grams of ZSM-5 with a silicon-aluminum ratio of 50 and mix them with 35 grams of pseudo-boehmite, add 2.7 grams of celadon powder, and mix well. Adding nitric acid mass percentage content afterwards is 48 grams of nitric acid aqueous solution of 5.5%, kneading molding, adding Ga(NO 3 ) 2 , the amount of Ga added is 1% by molecular sieve mass, extruded. The obtained catalyst precursor was dried at 120° C. for 8 hours, and calcined at 500° C. for 2 hours to obtain molecular sieve catalyst C3.
[0040] Catalyst activity evaluation is carried out on a fixed bed. The reaction conditions are that the catalyst mass is 3 grams, the reaction substrate is γ-valerolactone, and the weight space velocity is 1.5 hours. -1 , hydrogen pressure 1.0MPa, flow 50ml min -1 , temperature 420°C.
[0041] After the reaction, the conversion rate of the reaction substrate was 91%, the selectivity of BTX was 83%, and the carbon deposition percentage C%=4%.
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