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Device and method for preparing 2,6-dimethylnaphthalene

A technology of dimethylnaphthalene and temperature control device, which is applied in chemical instruments and methods, catalyst activation/preparation, isomerization hydrocarbon production, etc., can solve the problems of high cost, low purity, and low yield of 2,6-DMN problem, to achieve the effect of easy industrial application, simple operation and simple device structure

Inactive Publication Date: 2020-12-01
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low yield, high cost, low purity, or small possibility of industrial application of 2,6-DMN purified by traditional methods, the present invention proposes a method for preparing 2,6-dimethylnaphthalene device and method

Method used

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  • Device and method for preparing 2,6-dimethylnaphthalene
  • Device and method for preparing 2,6-dimethylnaphthalene

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preparation example Construction

[0033] The second aspect of the present invention proposes a method for preparing 2,6-dimethylnaphthalene, which uses the above-mentioned device for preparing 2,6-dimethylnaphthalene. Preferably, the preparation method comprises the following steps:

[0034] In the isomerization reaction step, the mixed solution of medium washing oil and organic solvent is introduced into the isomerization reactor 200 through the feed pipe 100 to carry out the isomerization reaction, and the temperature of the isomerization reactor 200 is controlled to be 320° C. to 400° C. ℃;

[0035]In the rectification step, the mixed liquid after the isomerization reaction is introduced into the rectification tower for rectification treatment, the temperature of the rectification tank 340 of the rectification tower is controlled to be 280°C-290°C, and the temperature control of the first temperature control device 310 The temperature is 270°C-280°C, the temperature control temperature of the second temper...

Embodiment 1

[0051] The weight ratio is sodium aluminate: sodium silicate: zinc hydroxide: palladium chloride = 1:1.5:2:0.5 Weigh 500g of sodium aluminate, sodium silicate, zinc hydroxide and palladium chloride in total, dissolve in 5L The mass concentration is 10% cetyltrimethylammonium bromide aqueous solution, stirring at 60°C for 45 minutes, adding sulfuric acid to adjust the pH to 8-10, and standing for 30 minutes to prepare the catalyst precursor.

[0052] The catalyst precursor was placed in an autoclave and reacted at 150°C for 5.0 hours. The obtained solid was washed and dried with deionized water, and then calcined at 600°C for 8.0 hours. The calcined solid was crushed into powder and uniformly viscous On the catalyst carrier 210 pottery sheet coated with silica sol, after standing at room temperature for a period of time, calcining at 350° C. for 1.5 h to prepare the catalyst-loaded pottery sheet. The pottery pieces are placed in the isomerization reactor 200 in a single and dou...

Embodiment 2

[0057] Sodium aluminate by weight: sodium silicate: zinc hydroxide: palladium chloride = 1:1.2:1.6:0.4 Weigh 500g of sodium aluminate, sodium silicate, zinc hydroxide, and palladium chloride in total, dissolve in 5L The mass concentration is 10% cetyltrimethylammonium bromide aqueous solution, stirred at 60° C. for 30 minutes, added sulfuric acid to adjust the pH to 8-10, and stood still for 20 minutes to prepare the catalyst precursor.

[0058] The catalyst precursor was placed in an autoclave and reacted at 120°C for 2.0 hours. The obtained solid was washed and dried with deionized water, and then calcined at 500°C for 5.0 hours. The calcined solid was crushed into powder and uniformly viscous On the catalyst carrier 210 pottery sheet coated with silica sol, after standing at room temperature for a period of time, calcining at 300° C. for 1.0 h to prepare the catalyst-loaded pottery sheet. The pottery pieces are placed in the isomerization reactor 200 in a single and double ...

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Abstract

The invention discloses a device and a method for preparing 2,6-dimethylnaphthalene. The device for preparing 2,6-dimethylnaphthalene comprises a feeding pipe, an isomerization reactor, a rectifying tower and a crystallization kettle which communicate with each other in sequence, wherein the feeding pipe is used for feeding raw materials; and a catalyst is added into the isomerization reactor andis loaded on a catalyst carrier. According to the device and the method for preparing 2,6-dimethylnaphthalene, medium-quality washing oil with low content of 2,6-dimethylnaphthalene are isomerized toincrease the content of 2,6-dimethylnaphthalene, then rectified for purification and finally subjected to crystallizing, so the yield of 2,6-dimethylnaphthalene is increased, and the purity of a 2, 6-dimethylnaphthalene product is obviously enhanced and reaches 95% or above. Besides, the device is simple in structure, and the method does not need to adopt a complexing agent with a high price, is simple to operate and easy for industrial application, and can obviously reduce the preparation cost of 2,6-dimethylnaphthalene.

Description

technical field [0001] The invention belongs to the technical field of petroleum coal tar separation, in particular, the invention relates to a device and method for preparing 2,6-dimethylnaphthalene. Background technique [0002] 2,6-Dimethylnaphthalene (2,6-DMN) is an important organic chemical raw material, and its oxidation product 2,6-naphthalene dicarboxylic acid is polycondensed with ethylene glycol to obtain polyethylene naphthalate (PEN) It is a new type of high performance polyester material. PEN has excellent heat resistance, chemical properties, mechanical properties, gas barrier properties, and mechanical properties, and has great application prospects in the fields of electronic components, aerospace, and food packaging. However, the limitation of 2,6-dialkylnaphthalene as raw material for PEN production has become the bottleneck of its application. [0003] Currently, 2,6-DMN can be obtained by chemical synthesis and direct extraction. The process of obtain...

Claims

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Application Information

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IPC IPC(8): C07C5/27C07C7/04C07C7/14C07C15/24B01J23/60B01J37/10B01J37/08B01J37/02
CPCC07C5/2754C07C7/04C07C7/14B01J23/60B01J23/002B01J37/10B01J37/088B01J37/0215C07C2523/60B01J2523/00C07C15/24B01J2523/27B01J2523/31B01J2523/41B01J2523/824
Inventor 李传刚王永飞刘清雷
Owner UNIV OF SCI & TECH LIAONING
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