Catalyst for hydrogenating and purifying crude 2,6-naphthalic acid and preparation method of catalyst

A kind of naphthalene dicarboxylic acid and catalyst technology, applied in the catalyst for the hydrogenation purification of crude 2,6-naphthalenedicarboxylic acid and the field of preparation thereof

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the crude 2,6-naphthalene dicarboxylic acid hydrogenation purification that exists in the prior art, which is prone to excessive hydrogenation to generate by-product 2,6-dicarboxytetralin. Catalyst for hydrogenation and purification of crude 2,6-naphthalene dicarboxylic acid obtained by air oxidation of 2,6-dimethylnaphthalene in the presence of Co-Mn-Br catalyst, the catalyst has high activity and is not prone to excessive hydrogenation specialty

Method used

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  • Catalyst for hydrogenating and purifying crude 2,6-naphthalic acid and preparation method of catalyst
  • Catalyst for hydrogenating and purifying crude 2,6-naphthalic acid and preparation method of catalyst
  • Catalyst for hydrogenating and purifying crude 2,6-naphthalic acid and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of carrier: take 500gAl 2 o 3 , and then follow the glucose and Al 2 o 3 The mass ratio is 0.65:1 to prepare 1000ml glucose aqueous solution, and 500gAl 2 o 3 Add it and soak for 12h. After impregnation, it was dried in a vacuum oven at 90°C for 3h, and then calcined at 500°C for 3h under the protection of nitrogen atmosphere to obtain a carrier whose carbon content was determined to be 10.1wt% by a carbon-sulfur analyzer.

[0021] Catalyst preparation: (NH 4 ) 6 Mo 7 o 24 and (NH 4 ) 6 h 2 W 12 o 40 Dissolve in water to obtain 100 ml of impregnating liquid, the content of Mo in the impregnating liquid is 0.42 g, the mass ratio of Mo to W is 1:0.5, mix the obtained impregnating liquid with 100 g of carrier, let stand for 12 h, and dry at 90°C for 3 h, Precursor I was obtained by roasting at 500°C for 3 hours in a muffle furnace; V (C 5 h 12 ) / V (H 2 )=1:3 in a mixed atmosphere at 700°C for 2h, then lower the temperature to obtain the prec...

Embodiment 2-5

[0025] Preparation of carrier: take 500gAl 2 o 3 , and then follow the glucose and Al 2o 3 The mass ratios are 0.25:1, 0.5:1, 0.75:1, and 1:1 to prepare 1000ml glucose aqueous solution, and 500gAl 2 o 3 Add it and soak for 12h. After impregnation, dry in a vacuum oven at 90°C for 3h, and then bake at 500°C for 3h under the protection of nitrogen atmosphere to obtain the carrier. The carbon content is 5.03wt%, 8.05wt%, 12.1wt% and 15.3wt%. All the other operations are the same as in Example 1. For convenience of comparison, the key experimental conditions used in Examples 2-5 and the obtained catalyst composition are listed in Table 2 and the catalyst evaluation results are listed in Table 3.

Embodiment 6

[0027] Preparation of carrier: take 500gAl 2 o 3 , and then follow the starch and Al 2 o 3 The mass ratio of each is 0.65:1 to prepare 1000ml starch aqueous solution, and 500gAl 2 o 3 Add it and soak for 12h. After impregnation, dry in a vacuum oven at 90°C for 3h, and then bake at 500°C for 3h under the protection of nitrogen atmosphere to obtain a carrier whose carbon content is 10.2wt%. All the other operations are the same as in Example 1. For convenience of comparison, the key experimental conditions used in Example 6 and the obtained catalyst composition are listed in Table 2 and the catalyst evaluation results are listed in Table 3.

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Abstract

The invention relates to a catalyst for hydrogenating and purifying crude 2,6-naphthalic acid and a preparation method of the catalyst, aiming at solving the problems that the crude 2,6-naphthalic acid can be excessively hydrogenated to generate 2,6-dicarboxyl tetrahydronaphthalene when being subjected to hydrogenation and purification in the prior art. According to the catalyst, carbon-covered aluminum oxide is used as a carrier, Pd is used as an active component, and Mo and W are used as catalyst promoters; the content of carbon in the carbon-covered aluminum oxide is 5-15wt%, the Pd content of the catalyst is 0.1-1wt%, and the Mo content is 0.1-1wt%; and the mass ratio of Mo to W is 1: (0.1-1). The catalyst can solve the problem well and can be used for industrial production of hydrogenation and purification of the crude 2,6-naphthalic acid.

Description

technical field [0001] The present invention relates to a kind of catalyst that is used for crude 2,6-naphthalene dicarboxylic acid hydrogenation purification and preparation method thereof, and described catalyst produces air by 2,6-dimethylnaphthalene in the presence of Co-Mn-Br catalyst Application in hydrogenation purification of crude 2,6-naphthalene dicarboxylic acid obtained by oxidation. Background technique [0002] 2,6-Naphthalene dicarboxylic acid (2,6-NDCA) is an important monomer for the preparation of various polyesters, polyurethane materials and liquid crystal polyester resins (LCP), especially prepared by the reaction of 2,6-NDCA and ethylene glycol The new high-performance polyester-polyethylene 2,6-naphthalate (PEN) has high strength, superior heat resistance, gas barrier properties, light resistance, chemical resistance, etc., and can be used to make films, food And beverage containers, fibers, magnetic base tapes, electronic components, etc. In additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652C07C63/38C07C51/487
Inventor 李建畅延青刘燕朱庆才
Owner CHINA PETROLEUM & CHEM CORP
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