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A kind of purification method of environment-friendly n-hexane

A purification method and n-hexane technology are applied in the field of purification of environment-friendly n-hexane, can solve problems such as inability to normally produce environment-friendly n-hexane, etc., and achieve the effects of low production cost, simple and controllable process, and less generation of waste liquid.

Active Publication Date: 2022-03-01
成都市科隆化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: aim at the above-mentioned problems, to provide a purification method of environmental protection grade n-hexane, adhering to the idea of ​​not introducing impurities, by using sulfuric acid and alkali columns to effectively control the introduction of impurities such as metal ions, in Without increasing production costs, reduce the content of metal ions in n-hexane, and solve the problem that enterprises cannot normally produce environmental-grade n-hexane

Method used

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  • A kind of purification method of environment-friendly n-hexane
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Examples

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Embodiment 1

[0020] A purification method of environment-friendly grade normal hexane, comprising the following steps:

[0021] Step 1. Add AR-grade sulfuric acid and industrial-grade n-hexane in a volume ratio of 1.5:100 into a treatment tank with a capacity of 1000L. Stir for 2 hours and let it stand until it separates. The lower layer is sulfuric acid solution, and then the lower layer of sulfuric acid solution separate;

[0022] Step 2, repeat the operation of step 1 twice to obtain n-hexane repeatedly treated with sulfuric acid, pass the n-hexane into the sodium hydroxide alkali column and circulate for 2 hours, and then separate the n-hexane;

[0023] Step 3. Pass the n-hexane separated in step 2 into a still with a capacity of 500L for distillation. The temperature of the still is 78°C, collect the n-hexane in the temperature range of 68-69°C in the still, and store it in a bottle filled with nitrogen after passing the test. .

Embodiment 2

[0025] A purification method of environment-friendly grade normal hexane, comprising the following steps:

[0026] Step 1. Add AR-grade sulfuric acid and industrial-grade n-hexane in a volume ratio of 1:100 into a treatment tank with a capacity of 1000L, stir for 1 hour and let it stand for layering. The lower layer is sulfuric acid solution, and then the lower layer of sulfuric acid solution separate;

[0027] Step 2, repeat the operation of step 1 4 times to obtain n-hexane repeatedly treated with sulfuric acid, pass the n-hexane into the sodium hydroxide alkali column and circulate for 1 hour, and then separate the n-hexane;

[0028]Step 3. Pass the n-hexane separated in step 2 into a still with a capacity of 500L for distillation. The temperature of the still is 78°C, collect the n-hexane in the temperature range of 68-69°C in the still, and store it in a bottle filled with nitrogen after passing the test. .

Embodiment 3

[0030] A purification method of environment-friendly grade normal hexane, comprising the following steps:

[0031] Step 1. Add AR-grade sulfuric acid and industrial-grade n-hexane in a volume ratio of 2:100 into a treatment tank with a capacity of 1000L. After stirring for 3 hours, let it stand until it separates. The lower layer is sulfuric acid solution, and then the lower layer of sulfuric acid solution separate;

[0032] Step 2, repeat the operation of step 1 twice to obtain n-hexane repeatedly treated with sulfuric acid, pass the n-hexane into the sodium hydroxide alkali column and circulate for 3 hours, and then separate the n-hexane;

[0033] Step 3. Pass the n-hexane separated in step 2 into a still with a capacity of 500L for distillation. The temperature of the still is 78°C, collect the n-hexane in the temperature range of 68-69°C in the still, and store it in a bottle filled with nitrogen after passing the test. .

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Abstract

The invention discloses a purification method of environmental protection grade n-hexane, which is characterized in that it comprises the following steps: Step 1, taking industrial grade n-hexane, adding AR grade sulfuric acid to the industrial grade n-hexane, stirring and standing, and separating the lower layer liquid ; Step 2, passing the normal hexane obtained in step 1 into the alkali column for circulation and processing, and then separating the normal hexane; n-Hexane. Through the treatment of sulfuric acid and alkali column, an environmentally friendly n-hexane with a purity of more than 98% and a transmittance of 225nm ultraviolet rays of more than 90% was obtained, which effectively controlled the influence of impurities such as metal ions on the optical properties of n-hexane and met the requirements The parameter requirements of environmental-grade n-hexane are met, and the problem that enterprises cannot normally produce environmental-grade n-hexane is solved.

Description

technical field [0001] The invention relates to the technical field of n-hexane purification, in particular to an environmental-grade n-hexane purification method. Background technique [0002] Industrial-grade n-hexane contains a small amount of impurities such as benzene, olefins, and isomers, and its purity is only 78-86%, which cannot meet the requirements of testing and analysis fields such as infrared oil detectors. Existing methods such as molecular sieve pressure swing adsorption The purity of n-hexane has reached 99%, but its preparation is complicated and costly, and it has not been widely used in industry. Nowadays, the industrial-grade n-hexane purification method still adopts multiple rectification or azeotropic distillation to purify n-hexane, and its purity can reach 97%. [0003] However, the industrial-grade n-hexane with a purity of only 97% cannot meet the high-end requirements of special fields. For example, when n-hexane is used for chromatograph and ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C7/04C07C7/148C07C9/15
CPCC07C7/005C07C7/04C07C7/14858C07C9/15
Inventor 赵绍益张松张仕君张碧元左祥群姚国锋冯强强吴晓玲刘贵明植利军钱红林
Owner 成都市科隆化学品有限公司
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