Catalyst for compounding 2, 6-dimethylnaphthalene and preparing method thereof

A technology of dimethylnaphthalene and catalyst, which is applied in the field of catalyst for the synthesis of 2,6-dimethylnaphthalene and its preparation, and can solve the problems of high cost, complicated process and long process route, etc.

Active Publication Date: 2012-06-27
KAILUAN ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Amoco and Mitsubishi are the only two companies in the world that have realized the industrial production of 2,6-dimethylnaphthalene. The processes used are all using ortho-xylene as raw material, through alkylation with butadiene side chain, dehydrogenation The preparation of 2,6-dimethylnaphthalene by cyclization, dehydroaromatization, isomerization and other processes requires the separation of intermediate products in each step before the next step of synthesis, so there are problems such as complex process, long process route and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: The catalyst used for the synthesis of 2,6-dimethylnaphthalene adopts the following preparation method.

[0027] by weight Na 2 O:SiO 2 :TPAOH:Al 2 o 3 :Fe 2 o 3 :H 2 PO 4 - : carbon aerogel=0.32:1.0:0.1:0.01:0.0163:0.0489:30, calculate and weigh raw materials NaOH, water glass, TPAOH (aq, 20%), Al (NO 3 ) 3 9H 2 O, Fe 2 (SO 4 ) 3 , NaH 2 PO 4 and carbon aerogels.

[0028] Mix the water glass NaOH solution evenly, add TPAOH(aq), stir evenly; add Al(NO 3 ) 3 9H 2 O solution is mixed with the above mixture evenly, and then Fe 2 (SO 4 ) 3 , stir evenly; add NaH to the above mixture 2 PO 4 After stirring the solution vigorously for 2 hours, add charcoal airgel dried at 120°C for 5 hours, and stir evenly; the above mixture was aged at room temperature for 22 hours, and the obtained gel was crystallized at 175°C for 72 hours. The sample obtained above was suction-filtered, fully washed with deionized water, dried at 120°C for 4 hours, and ...

Embodiment 2

[0030] Example 2: The catalyst used for the synthesis of 2,6-dimethylnaphthalene adopts the following preparation method.

[0031] by weight Na 2 O:SiO 2 :TPAOH:Al 2 o 3 :Fe 2 o 3 :H 2 PO 4 - : carbon aerogel=0.25:1.0:0.2:0.02:0.01:0.06:22, calculate and weigh raw materials NaOH, water glass, TPAOH (aq, 20%), Al (NO 3 ) 3 9H 2 O, Fe 2 (SO 4 ) 3 , NaH 2 PO 4 and carbon aerogels.

[0032] Mix the water glass NaOH solution evenly, add TPAOH(aq), stir evenly; add Al(NO 3 ) 3 9H 2 O solution is mixed with the above mixture evenly, and then Fe 2 (SO 4 ) 3 , stir evenly; add NaH to the above mixture 2 PO 4 After stirring the solution vigorously for 1 hour, add charcoal airgel dried at 120°C for 6 hours, and stir evenly; the above mixture was aged at room temperature for 20 hours, and the obtained gel was crystallized at 175°C for 70 hours. The sample obtained above was suction-filtered, fully washed with deionized water, dried at 120°C for 5 hours, and calci...

Embodiment 3

[0034] Example 3: The catalyst used to synthesize 2,6-dimethylnaphthalene adopts the following preparation method.

[0035] by weight Na 2 O:SiO 2 :TPAOH:Al 2 o 3 :Fe 2 o 3 :H 2 PO 4 - : carbon aerogel=0.5:1.0:0.05:0.03:0.03:0.03:45, calculate and weigh the raw materials NaOH, water glass, TPAOH (aq, 20%), Al (NO 3 ) 3 9H 2 O, Fe 2 (SO 4 ) 3 , NaH 2 PO 4 and carbon aerogels.

[0036] Mix the water glass NaOH solution evenly, add TPAOH(aq), stir evenly; add Al(NO 3 ) 3 9H 2 O solution is mixed with the above mixture evenly, and then Fe 2 (SO 4 ) 3 , stir evenly; add NaH to the above mixture 2 PO 4 After stirring the solution vigorously for 3 hours, add charcoal airgel dried at 120°C for 3 hours, and stir evenly; the above mixture was aged at room temperature for 25 hours, and the obtained gel was crystallized at 175°C for 75 hours. The sample obtained above was suction-filtered, fully washed with deionized water, dried at 120°C for 3 hours, and calcine...

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PUM

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Abstract

The invention discloses a catalyst for compounding 2, 6-dimethylnaphthalene and a preparing method thereof. The weight ratio of main components of the catalyst is: Na 2O 0.25-0.5 parts, SiO 2 1.0 parts, tetrapropyl ammonium bromide (TPABr) 0.05-0.2 parts, Al2O3 0.01-0.03 parts, Fe2O3 0.01-0.03 parts, H2PO4- 0.03-0.06 parts and carbon aerogel 22-45 parts. The catalyst for compounding the 2, 6-dimethylnaphthalene and the preparing method of the catalyst are used in an alkylation reaction of 2-methylnaphthalene and methanol, the selectivity and yield of the 2, 6-dimethylnaphthalene respectively reach 50% and 17% and are obviously better than those of a common molecular sieve catalyst.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for synthesizing 2,6-dimethylnaphthalene and a preparation method thereof. Background technique [0002] 2,6-dialkylnaphthalene is an important intermediate in the synthesis of high-performance polyester materials, and polyethylene naphthalate (PEN ) is a new type of polyester material. Compared with the currently commonly used polyethylene terephthalate (PET), PEN is superior to PET in many aspects and is a substitute for PET in the future. The key to the commercial production of PEN is the source and cost of the raw material monomer 2,6-naphthalene dicarboxylic acid. At present, the main factor that restricts PEN from entering the market on a large scale is the high price of 2,6-dialkylnaphthalene, the raw material for synthesizing PEN. [0003] Compared with other naphthalene-containing compounds, 2,6-dimethylnaphthalene is the most economical because of its easy oxidation, simple o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46C07C15/24C07C2/88
Inventor 王亚涛房承宣胡浩权郭学华靳立军于泳彭胜
Owner KAILUAN ENERGY CHEM
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