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Purification method of environmentally-friendly n-hexane

A purification method and n-hexane technology are applied in the field of purification of environment-friendly n-hexane, which can solve problems such as inability to produce environment-friendly n-hexane normally, and achieve the effects of low production cost, few production processes, and simple and controllable processes.

Active Publication Date: 2020-01-10
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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  • Purification method of environmentally-friendly n-hexane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An environmentally-friendly purification method for n-hexane includes the following steps:

[0021] Step 1. Add AR grade sulfuric acid and technical grade n-hexane in a 1000L processing barrel at a volume ratio of 1.5:100. After stirring for 2 hours, let stand for separation. 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 that has been repeatedly treated with sulfuric acid, pass the n-hexane into a sodium hydroxide alkali column for circulation for 2 hours, and then separate the n-hexane;

[0023] Step 3. Pass the n-hexane separated in step 2 into a distillation kettle with a capacity of 500L for distillation. The temperature of the distillation kettle is 78°C. The temperature range of 68-69°C in the kettle is collected. After passing the test, it is bottled and stored with nitrogen. .

Embodiment 2

[0025] An environmentally-friendly purification method for n-hexane includes the following steps:

[0026] Step 1. Add AR grade sulfuric acid and industrial grade n-hexane in a 1000L processing barrel at a volume ratio of 1:100, stir for 1 hour and then stand for separation. The lower layer is the 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 that has been repeatedly treated with sulfuric acid, pass the n-hexane into a sodium hydroxide alkali column for circulation for 1 hour, and then separate the n-hexane;

[0028] Step 3. Pass the n-hexane separated in step 2 into a distillation kettle with a capacity of 500L for distillation. The temperature of the distillation kettle is 78°C. The temperature range of 68-69°C in the kettle is collected. After passing the test, it is bottled and stored with nitrogen. .

Embodiment 3

[0030] An environmentally-friendly purification method for n-hexane includes the following steps:

[0031] Step 1. Add AR grade sulfuric acid and technical grade n-hexane in a 1000L processing barrel at a volume ratio of 2:100. After stirring for 3 hours, let stand for separation. 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 that has been repeatedly treated with sulfuric acid, pass the n-hexane into a sodium hydroxide alkali column for circulation for 3 hours, and then separate the n-hexane;

[0033] Step 3. Pass the n-hexane separated in step 2 into a distillation kettle with a capacity of 500L for distillation. The temperature of the distillation kettle is 78°C. The temperature range of 68-69°C in the kettle is collected. After passing the test, it is bottled and stored with nitrogen. .

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Abstract

The invention discloses a purification method of environmentally-friendly n-hexane. The method comprises the following steps: 1, taking industrial n-hexane, adding AR-grade sulfuric acid into the industrial n-hexane, performing stirring, standing the obtained mixture, and separating out the obtained lower-layer liquid; 2, introducing n-hexane obtained in step 1 into an alkali column for circular flow for treatment, and then separating out the n-hexane; and 3, rectifying the n-hexane separated in step 2, and collecting the rectified n-hexane to obtain the environmentally-friendly n-hexane. Sulfuric acid and alkali column treatment modes are adopted to obtain the environmentally-friendly n-hexane with the purity of 98% or above and the 225 nm ultraviolet ray transmittance of 90% or above, the influences of impurities such as metal ions on the optical performances of the n-hexane are effectively controlled, the parameter requirements of the environmentally-friendly n-hexane are met, and the problem that currently enterprises cannot normally produce the environment-friendly n-hexane is solved.

Description

Technical field [0001] The invention relates to the technical field of n-hexane purification, in particular to a purification method of environmentally-friendly n-hexane. Background technique [0002] Industrial-grade n-hexane contains a small amount of impurities such as benzene, olefins, isomers, and its purity is only 78-86%, which cannot meet the requirements of testing and analysis fields such as infrared oil meters. It is produced by existing molecular sieve pressure swing adsorption methods. 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 the n-hexane, and its purity can reach 97%. [0003] However, 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 an...

Claims

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Application Information

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Patent Type & Authority Applications(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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