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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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...

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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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