Direct distillation technology for 2-methylnaphthalene

A technology of methyl naphthalene and mixed methyl naphthalene, applied in the field of distillation technology, can solve problems such as increasing solvent recovery process, increasing solvent consumption, increasing cost, etc., and achieves improved thermal efficiency and energy utilization rate, guaranteed product quality, and zero emissions. The effect of the production process

Active Publication Date: 2011-06-01
BAOSHUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of process increases the consumption of solvent, increases the cost, increases the so

Method used

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  • Direct distillation technology for 2-methylnaphthalene
  • Direct distillation technology for 2-methylnaphthalene
  • Direct distillation technology for 2-methylnaphthalene

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A kind of direct distillation technique of 2-methylnaphthalene, process step is as follows:

[0022] After A, mixed methyl naphthalene cuts the naphthalene cut from the top of the atmospheric pressure primary distillation tower (1), the tower bottom liquid directly enters the negative pressure flash evaporator (2) to separate under the heat preservation state;

[0023] B, extract the mixed methylnaphthalene from the bottom of the negative pressure flash evaporator (2), and extract the 2-methylnaphthalene cut from the top of the negative pressure flash evaporator (2);

[0024] C, extract the 2-methylnaphthalene cut from the top of the negative pressure flash evaporator (2) and enter the negative pressure rectification tower (3), carry out negative pressure rectification, and extract the mixed fraction from the bottom of the negative pressure rectification tower (3) tower Methylnaphthalene enters the raw material tank for reuse, and 2-methylnaphthalene is extracted from t...

Embodiment 2

[0028] A kind of direct distillation technique of 2-methylnaphthalene, process step is as follows:

[0029] After A, mixed methyl naphthalene cuts the naphthalene cut from the top of the atmospheric pressure primary distillation tower (1), the tower bottom liquid directly enters the negative pressure flash evaporator (2) to separate under the heat preservation state;

[0030] B, extract the mixed methylnaphthalene from the bottom of the negative pressure flash evaporator (2), and extract the 2-methylnaphthalene cut from the top of the negative pressure flash evaporator (2);

[0031] C, extract the 2-methylnaphthalene cut from the top of the negative pressure flash evaporator (2) and enter the negative pressure rectification tower (3), carry out negative pressure rectification, and extract the mixed fraction from the bottom of the negative pressure rectification tower (3) tower Methylnaphthalene enters the raw material tank for reuse, and 2-methylnaphthalene is extracted from t...

Embodiment 3

[0034] The process steps of this embodiment are the same as those in Example 1. The pressure at the top of the atmospheric initial distillation tower (1) is normal pressure, the temperature at the top of the tower is 215° C., and the reflux ratio is 10. The vacuum degree of the negative pressure rectification tower (3) tower top pressure is 90%, the tower top temperature is 160 ℃, and the reflux ratio is 15.

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Abstract

The invention discloses a direct distillation technology for 2-methylnaphthalene, which comprises the following steps: A. removing naphthalene fractions from the mixed methylnaphthalene at the top of the primary distillation tower (1) and then directly introducing a tower bottom liquid into a negative pressure flash evaporator (2) for separation; B. extracting the mixed methylnaphthalene from thebottom of the negative pressure flash evaporator (2) and 2-methylnaphthalene fractions from the tower top of the negative pressure flash evaporator (2); and C. extracting the 2- methylnaphthalene fractions from the tower top of the negative pressure flash evaporator (2) to enter into a negative pressure rectifying tower (3) for carrying out the negative pressure rectification, and finally extracting the mixed methylnaphthalene from the tower bottom of the negative pressure rectifying tower (3) and the 2-methylnaphthalene from the tower top of the negative pressure rectifying tower (3). The amount of the extracted 2-methylnaphthalene in the invention reaches 97%, and the annual output of a single device reaches 2400 tons. What is more, the emission amount of the three wastes is less and can be eliminated automatically, thus being a clean and zero release production technology.

Description

technical field [0001] The invention relates to a distillation process, in particular to a direct distillation process of 2-methylnaphthalene. Background technique [0002] At present, the method usually used for extracting 2-methylnaphthalene from washing oil is continuous distillation at atmospheric pressure with six furnaces and six towers. However, this kind of technological process is long, unfavorable for production control, energy consumption is large, extraction rate is low, yield is small, and only 95% of 2-methylnaphthalene can be extracted. Another commonly used method is: solvent distillation. This kind of process increases the consumption of solvent, increases the cost, increases the solvent recovery process, and produces waste liquid, causing environmental protection difficulties. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a simplified and efficient extraction process of 2-methylnaphthalene. ...

Claims

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Application Information

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IPC IPC(8): B01D3/10B01D3/06C07C7/04C07C15/24
Inventor 魏善兆
Owner BAOSHUN TECH CO LTD
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