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Separation and purification technology of 2-methylnaphthalene

A technology of methyl naphthalene and mixed methyl naphthalene is applied in the directions of crystallization purification/separation, distillation purification/separation, hydrocarbon purification/separation, etc., and can solve the problems of difficulty in separation, difficulty in obtaining starting materials, and increased investment in equipment, etc. achieve low energy consumption

Inactive Publication Date: 2017-01-11
PENG CHEN NEW MATERIALS TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

The deficiency that this method exists is, (1) starting material is difficult to obtain, (2) when the temperature of operating environment is higher, it is quite difficult to separate 2-methylnaphthalene crystals from the mother liquor, and it is necessary to reclaim alcohol simultaneously Also increase investment in equipment

Method used

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  • Separation and purification technology of 2-methylnaphthalene

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Embodiment 2

[0033] Embodiment two, between step three and step four of embodiment, increase a pre-negative pressure distillation process, flow the liquid material after step three in embodiment one into negative pressure distillation tower 3; From negative pressure distillation tower 3. The mixed methylnaphthalene is extracted from the bottom of the tower, and the 2-methylnaphthalene fraction is extracted from the top of the negative pressure distillation tower; the temperature at the top of the tower is 180°C; the vacuum degree of the pressure at the top of the tower is 95%, and the temperature at the top of the tower is 170°C. The reflux ratio is 10; the output content is not less than 98% of 2-methylnaphthalene;

[0034] The mixed methylnaphthalene extracted in the above steps is frozen at -20°C, crystallized and suction filtered, and 2-methylnaphthalene with a purity greater than 99.8% is extracted therefrom. The extracted 2-methylnaphthalene enters the catalyst 5 to allow trace compo...

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Abstract

The invention relates to a separation and purification technology of 2-methylnaphthalene. The technology comprises the following steps: adding mixed methylnaphthalene barren liquid serving as a start raw material into a reactor with an acid solution; adding an alkaline solution into the reactor, and heating to 60-70 DEG C while stirring; with total duration of at least 4h, preserving heat for 1h, and standing for layering; after that, taking the upper-layer mixed 2-methylnaphthalene and introducing into a filter with an active carbon fiber filling layer; then introducing the mixed methylnaphthalene into a negative-pressure rectifying tower for negative-pressure rectification; extracting the mixed methylnaphthalene from the bottom of the negative-pressure rectifying tower, and extracting 2-methylnaphthalene fraction from the top of the negative-pressure rectifying tower, wherein the vacuum degree of the top pressure of the negative-pressure rectifying tower is over 95%, the top temperature is 150-170 DEG C, and the reflux ratio is 10-15; and performing freezing, crystallization and suction filtration on the extracted 2-methylnaphthalene. The separation and purification technology of 2-methylnaphthalene, provided by the invention, is simple and convenient while the energy consumption is low; and the purity of the separated 2-methylnaphthalene is up to 99.8wt%, and the yield reaches 99.5%.

Description

technical field [0001] The invention relates to a separation and purification process of 2-methylnaphthalene, in particular to a process for separating and purifying 2-methylnaphthalene from mixed methylnaphthalene. Background technique [0002] 2-Methylnaphthalene (β-methylnaphthalene) is an important chemical raw material and intermediate. For example, 2-methylnaphthalene can be used to prepare 2,6-naphthalene dicarboxylic acid (the carboxylic acid is a key component in the production of high-temperature-resistant polymers); it is used to synthesize vitamins K1, K3 and K4. In addition, 2-methylnaphthalene can also be used in the production of fragrances and other fine chemicals, so its commercial preparation has attracted the attention of chemists. [0003] US 3,219,719 discloses a method for purifying 2-methylnaphthalene through isomerization. Alkylnaphthalene is added under the action of a catalyst, and 2-methyldecalin is separated by utilizing the physical properties ...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/20C07C7/04C07C7/14C07C7/177C07C15/24
CPCC07C7/00C07C7/005C07C7/04C07C7/14C07C7/177C07C7/20C07C15/24
Inventor 谈勇谈俊江晓龙乔久昌
Owner PENG CHEN NEW MATERIALS TECH CO LTD
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