Method for producing aromatic hydrocarbons
A manufacturing method and technology of aromatic hydrocarbons, applied in chemical instruments and methods, physical/chemical process catalysts, bulk chemical production, etc., can solve the problems of inevitable production of olefin species, catalyst deactivation, etc., and restore aromatization activity , reduce the frequency of regeneration and prolong the service life
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Embodiment 1
[0044] 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 and calcined at 500° C. for 2 hours to obtain molecular sieve catalyst C1.
[0045] Catalyst activity evaluation is carried out on a fixed bed, reaction conditions: catalyst mass is 3 grams, reaction substrate is 50% propiolactone+50% water, weight space velocity 1.0 hour -1 , hydrogen pressure 1.0MPa, flow 50ml min -1 , the temperature is 450°C, the conversion rate of propiolactone is 86%, and the T60 is 970 hours.
Embodiment 2
[0047] 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 and calcined at 500° C. for 2 hours to obtain molecular sieve catalyst C2.
[0048] Catalyst activity evaluation is carried out on a fixed bed, the reaction conditions catalyst mass is 3 grams, the reaction substrate is 30% butyrolactone + 70% water, and the weight space velocity is 2.0 hours -1 , hydrogen pressure 1.0MPa, flow 50ml min -1 , the temperature is 400°C, the conversion rate of butyrolactone is 82%, and the T60 is 960 hours.
Embodiment 3
[0050] Weigh 35 grams of ZSM-5 with a silicon-aluminum ratio of 150 and mix them with 35 grams of pseudo-boehmite, add 2.7 grams of safflower 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 and calcined at 500° C. for 2 hours to obtain molecular sieve catalyst C3.
[0051] 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 grams. Levulinic acid was obtained in a fixed bed at 20% metal loading on Cu...
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