Method for preparing toluene and p-xylene by alkylation reaction of benzene and methanol
A technology of alkylation reaction and p-xylene, applied in chemical instruments and methods, physical/chemical process catalysts, catalysts, etc., can solve the problem of low methanol alkylation selectivity, complex alkylation reaction process, and catalyst deactivation Fast speed and other problems, to achieve the effect of easy distillation and separation, high effective utilization of raw materials, and long stable operation time
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Embodiment 1
[0067] Example 1: Preparation of core-shell structure HZSM-5 molecular sieve
[0068] Prepare 100g ethanol aqueous solution with 50% ethanol mass fraction from 50g absolute ethanol and 50g deionized water. According to the ratio of liquid-solid mass ratio of 5:1, 20g SiO 2 / Al 2 O 3 The original HZSM-5 molecular sieve powder with a molar ratio of 32 was added to the ethanol aqueous solution, and 20 g of bromohexadecylpyridine with a mass ratio of 1:1 to the original molecular sieve powder was added, stirred and mixed at 45 ° C for 0.5 h, and then added 20g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) with a mass ratio of 1:1 to the original molecular sieve powder was continuously stirred for 0.5 h, and added dropwise with a mass ratio of 1.5 to the original molecular sieve powder. : 30 g of ethyl orthosilicate of 1, continue stirring for 1 h. The mixture was transferred to a plastic crystallization tank, hydrothermally crystallized ...
Embodiment 2
[0071] Example 2: Preparation of extrusion catalyst
[0072] According to the ratio of rare earth metal source, succulent powder and molecular sieve mass ratio of 0.1:1 and 0.02:1, respectively, 20g core-shell structure HZSM-5-200-22 molecular sieve, 2g lanthanum nitrate hexahydrate and 0.4g sucrose powder were stirred. Mix for 10min to obtain a mixture; add 16g of silica sol with a molecular sieve mass ratio of 0.8:1 to the mixture while stirring, knead the resulting mixture into a mud mass, and adopt the TBL- Type 2 catalyst molding extrusion device is extruded into strips; the strips are air-dried at 5 °C for 12 hours, and then heated in a horse boiler at a heating rate of 0.5 °C / min, from 5 °C to 500 °C, and calcined at a constant temperature 10h, to obtain a mass ratio of 3.76% La with HZSM-5-200-22 molecular sieve 2 O 3 and 20% SiO 2 The core-shell structure HZSM-5-200-22 molecular sieve molding catalyst is marked as HZSM-5-200-22-A.
[0073] According to the ratios ...
Embodiment 3
[0075] Example 3: Preparation of supported metal oxide modified catalyst
[0076] 2.0g of magnesium nitrate hexahydrate and 0.2g of citric acid were added to 20g of deionized water, stirred and mixed for 5min at a temperature of 10°C, to obtain 22.2g of citric acid penetrant and magnesium element molar ratio of 0.12:1 infiltration impregnation solution; 2.0g of lanthanum cerium carbonate and 0.5g of ethylenediaminetetraacetic acid were added to 20g of deionized water, stirred and mixed for 5min at a temperature of 10°C to obtain 22.5g of ethylenediaminetetraacetic acid complexing agent and lanthanum in a molar ratio of 0.7: 1 of the complexed impregnation solution. 10g of HZSM-5-200-22-A molding catalyst was added to the infiltration and impregnation solution while stirring, the mass ratio of the solution to the molding catalyst was 2.22:1, stirring and immersing at 5°C for 24h, and drying at 50°C. Dry for 48h to obtain osmotic impregnated samples. The osmotic impregnation s...
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