Catalyst used for alkylation of methanol, C10 aromatic hydrocarbons and 2-methylnaphthalene for synthesizing 2,6-dimethylnaphthalene

A kind of methyl decalin, carbon ten aromatic hydrocarbon technology, applied in physical/chemical process catalyst, hydrocarbon, hydrocarbon and other directions, can solve the process of limiting industrial application, low methyl naphthalene conversion rate, volatile catalyst It can achieve high reactivity and product selectivity, improve selectivity and catalytic stability, and inhibit isomerization and other side reactions.

Inactive Publication Date: 2011-02-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct synthesis of 2,6-dimethylnaphthalene by alkylation of methylnaphthalene and methanol is simple and efficient, but the reaction yield is low and the catalyst is easily deactivated, which limits the industrial application of this technology
US4795847 (J weitkamp et al.) reported that methylnaphthalene and methyl alcohol carried out alkylation reaction on ZSM-5, after reacting for 0.5 hours, the selectivity of 2,6-dimethylnaphthalene product was 32%, but methyl The conversion rate of naphthalene is only 7%; as the reaction time prolongs, the conversion rate of methylnaphthalene is basically unchanged, but the selectivity of 2,6-dimethylnaphthalene will decrease
CN1151107C (Bai Xuefeng, Liu Wenbin, Xia Yuanliang, etc.) reported that Mg 2+ The exchanged ZSM-5 molecular sieve catalyzed the alkylation reaction of naphthalene or methylna

Method used

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  • Catalyst used for alkylation of methanol, C10 aromatic hydrocarbons and 2-methylnaphthalene for synthesizing 2,6-dimethylnaphthalene
  • Catalyst used for alkylation of methanol, C10 aromatic hydrocarbons and 2-methylnaphthalene for synthesizing 2,6-dimethylnaphthalene
  • Catalyst used for alkylation of methanol, C10 aromatic hydrocarbons and 2-methylnaphthalene for synthesizing 2,6-dimethylnaphthalene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using SiO 2 / Al 2 o 3 42g of hydrogen-type ZSM-5 molecular sieve and 18g of Al with a molar ratio of 290 2 o 3 Mix, then add 3.6g of Tianqing powder and mix evenly, then add a certain amount of 3wt% dilute nitric acid as a binder, knead well, carry out extrusion molding, after drying at 85°C, bake at 540°C for 4 hours, using a temperature program , the heating rate was 3°C / min; the obtained HZSM-5 was designated as Catalyst Ⅰ.

Embodiment 2

[0025] The HZSM-5 molecular sieve prepared by the method described in Example 1 was impregnated with the obtained 10g molecular sieve in 9ml, 21.0wt% concentration of nickel nitrate aqueous solution, then dried at 85°C for 24 hours, and then calcined at 540°C for 4 Hours, using a temperature program with a heating rate of 3°C / min; 6.0wt% NiO / HZSM-5 was obtained, which was designated as Catalyst II.

Embodiment 3

[0027] Using the 6.0wt% Ni / HZSM-5 prepared by the method described in Example 2, after impregnating the prepared 10g molecular sieve in 9ml, 49.7wt% concentration of magnesium nitrate aqueous solution, dry at 85°C for 24 hours, and then dry at 540°C Calcined at lower temperature for 4 hours, using a temperature program with a heating rate of 3°C / min; 14.0wt% MgO / 6.0wt% NiO / HZSM-5 was obtained, which was designated as Catalyst III.

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Abstract

The invention relates to a catalyst used for alkylation of methanol, C10 aromatic hydrocarbons and 2-methylnaphthalene for synthesizing 2,6-dimethylnaphthalene, and mainly solves the problems of low conversion rate of the 2-methylnaphthalene, low selectivity of the 2,6-dimethylnaphthalene and low stability of the catalyst in the conventional synthesis process technology. In the technical scheme of the invention, the catalyst comprises the following components in part by weight: 50 to 95 parts of one or a mixture of any two of hydrogen-type silicon-aluminum zeolites, 5 to 50 parts of binder and 1.0 to 15 parts of metal oxide of at least one of transition metal, rare-earth metal and alkaline-earth metal; and the reaction conditions for synthesizing the 2,6-dimethylnaphthalene are that: temperature is between 360 and 500 DEG C, pressure is between 0 and 7.5MPa, the molar ratio of the methanol to the 2-methylnaphthalene is between 1.0 and 3.0, the weight ratio of the C10 aromatic hydrocarbons to the 2-methylnaphthalene is between 1.0 and 6.0, and air speed is between 0.1 and 3.5 hour<-1>. The catalytic reaction ensures relatively high synthesis yield of the 2,6-dimethylnaphthalene, and the problems in the prior art are well solved.

Description

technical field [0001] The invention relates to a catalyst for synthesizing 2,6-dimethylnaphthalene by alkylation of methanol, carbon ten aromatic hydrocarbons and 2-methylnaphthalene. Background technique [0002] 2,6-dimethylnaphthalene (2,6-DMN) is considered to be the most ideal raw material for the production of high-performance polyester material-polyethylene naphthalate (PEN). At present, only the BP-Amoco process of 2,6-dimethylnaphthalene industrialized production method has low yield, many steps, and serious pollution of by-products (Asian Chemical News, Nov.16, 1998; Chemical Market Reporter, Aug.2, 1999). Therefore, the new 2,6-dimethylnaphthalene synthesis process has attracted more and more attention. The direct synthesis of 2,6-dimethylnaphthalene by alkylation of methylnaphthalene and methanol is simple and efficient, but the reaction yield is low and the catalyst is easily deactivated, which limits its industrial application. US4795847 (J weitkamp et al.)...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J29/80C07C6/12B01J29/76B01J29/16B01J29/24C07C2/86B01J29/78C07C15/24
Inventor 朱志荣李军辉胡中华
Owner TONGJI UNIV
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