Method for preparing 2-methyl-6-tert-butylnaphthalene from 2-methylnaphthalene through alkylation
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A technology of methyldecalinyl and methylnaphthalene, which is applied in the field of 2-methylnaphthalene alkylation to prepare 2-methyl-6-tert-butylnaphthalene, which can solve the problems of large loss of carbon atoms and poor atom economy , to achieve the effect of reducing the loss of carbon atoms, easy separation, and inhibition of side reactions
Active Publication Date: 2016-05-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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[0004] In summary, the selectivity of 2,6-dimethylnaphthalene and the ratio of 2,6 / 2,7-dimethylnaphthalene in the reaction product of naphthalene / 2-methylnaphthalene and methanol methylation are low, while The selectivity of 2,6-di-tert-butylnaphthalene and the ratio of 2,6 / 2,7-di-tert-butylnaphthalene in the alkylation reaction product of naphthalene and tert-butanol were greatly increased, which indicated that tert-butanol was the However, 2,6-di-tert-butylnaphthalene loses a lot of carbon atoms in the subsequent oxidation process, and the atom economy is poor.
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Embodiment 1
[0030] Catalyst preparation
[0031] Roast 50g of HZSM-5, HZSM-12, HY, HBeta, HZSM-18, HMOR, SAPO-5 in a muffle furnace at 550°C for 4 hours, put them in 50g of tetramethyl silicate and soak them for 8 hours, and after centrifugation, The solid samples were dried in an air atmosphere at 120°C and calcined at 550°C for 3 hours to obtain modified molecular sieve catalysts, which were named HZSM-5-01, HZSM-12-01, HY-01, HBeta-01, and HZSM-18 -01, HMOR-01, SAPO-5-01.
Embodiment 2
[0033] Catalyst preparation
[0034] Roast 50g of HZSM-18, HMOR and SAPO-5 in a muffle furnace at 550°C for 4 hours, put them into 50g of tetraethyl silicate and soak them for 12 hours, after centrifugation, dry the solid samples in an air atmosphere at 120°C, 550°C ℃ for 4 hours to obtain modified molecular sieve catalysts, named HZSM-18-02, HMOR-02, SAPO-5-02, respectively.
Embodiment 3
[0036] Catalyst preparation
[0037] 50g of HMOR was roasted in a muffle furnace at 550°C for 4 hours, immersed in 50g of tetrapropyl silicate for 24 hours, centrifuged, the solid sample was dried in an air atmosphere at 120°C, and roasted at 550°C for 3 hours to obtain the modified The molecular sieve catalyst named HMOR-03.
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Abstract
The invention provides a method for preparing 2-methyl-6-tert-butylnaphthalene from 2-methylnaphthalene through alkylation, belonging to the field of chemistry and chemical engineering. The method uses 2-methylnaphthalene (beta-methylnaphthalene) as a raw material and highly selectively prepares 2-methyl-6-tert-butylnaphthalene by subjecting 2-methylnaphthalene (beta-methylnaphthalene) and tert-butyl alcohol or isobutene to alkylation. A siloxane-based compound modified molecular sieve catalyst is used for catalyzing a reaction of 2-methylnaphthalene with tert-butyl alcohol or isobutene to prepare 2-methyl-6-tert-butylnaphthalene, and the selectivity of 2-methyl-6-tert-butylnaphthalene in products and a ratio of 2-methyl-6-tert-butylnaphthalene to 2-methyl-7-tert-butylnaphthalene can be effectively increased. The method is simple to operate and low in cost and has potential application value.
Description
technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and in particular relates to a method for preparing 2-methyl-6-tert-butylnaphthalene by alkylation of 2-methylnaphthalene. Background technique [0002] 2,6-dialkylnaphthalene is a key raw material for the production of high-performance polyester fibers and plastics, and its oxidation product 2,6-naphthalene dicarboxylic acid is polymerized with ethylene glycol to obtain polyethylene naphthalate (PEN) It is a new polyester material with great potential and application prospect. PEN has unique heat resistance, mechanical properties, gas barrier properties, chemical stability and radiation resistance, etc., and can be widely used in the manufacturing industries of electronic components, instruments and meters, insulating materials, films for food packaging, beer bottles, and aerospace . At present, the bottleneck of large-scale application of PEN lies in the cumbersome preparatio...
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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C15/24
Inventor 袁扬扬许磊张晓敏徐力陈欣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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