CN108373426A - The separation method of acetonitrile and toluene mixture liquid - Google Patents
The separation method of acetonitrile and toluene mixture liquid Download PDFInfo
- Publication number
- CN108373426A CN108373426A CN201810205636.8A CN201810205636A CN108373426A CN 108373426 A CN108373426 A CN 108373426A CN 201810205636 A CN201810205636 A CN 201810205636A CN 108373426 A CN108373426 A CN 108373426A
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- Prior art keywords
- acetonitrile
- toluene
- mixture liquid
- water
- toluene mixture
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/32—Separation; Purification; Stabilisation; Use of additives
- C07C253/34—Separation; Purification
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/005—Processes comprising at least two steps in series
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses the separation methods of a kind of acetonitrile and toluene mixture liquid, which is characterized in that includes the following steps：A, acetonitrile is contacted with toluene mixture liquid with water, extraction；B, the heated aqueous of extract liquor carries out piptonychia benzene processing, removes contained a small amount of toluene in water phase, and remaining acetonitrile is carried out dehydrating to obtain grade acetonitrile product with aqueous mixtures；C, the organic phase of extract liquor obtains industrial grade toluene.Through the method for the present invention treated waste liquid containing acetonitrile, grade acetonitrile and toluene product can be obtained from recycling acetonitrile and toluene in toluene and acetonitrile mixed solution in the separation method of acetonitrile provided by the invention and toluene mixture liquid.Using the method for the present invention, not only solvent acetonitrile and toluene was utilized in Recovery and recycle, but also can reduce waste and pollution.
Description
Technical field
The present invention relates to solvent purifications field, more particularly to the separation method of a kind of acetonitrile and toluene mixture liquid.
Background technology
Acetonitrile and toluene are all that there are commonly solvents, and in actual use, two kinds of solvents use simultaneously sometimes.
Due to belonging to organic matter, property is similar, and acetonitrile and toluene rectifying form azeotropic mixture when detaching, it is difficult to detach.
Invention content
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of separation of acetonitrile and toluene mixture liquid
Method.
In order to achieve the above object, the invention is realized by the following technical scheme：
The separation method of acetonitrile and toluene mixture liquid, which is characterized in that include the following steps：
A. acetonitrile is contacted with toluene mixture liquid with water, extraction；
B. the heated aqueous of extract liquor carries out piptonychia benzene processing, and water, acetonitrile and toluene are azeotroped off toluene, remaining acetonitrile with
Aqueous mixtures are carried out dehydrating to obtain grade acetonitrile product；
C. the organic phase of extract liquor obtains industrial grade toluene.
According to one embodiment of present invention, in step a, water enters from extraction column overhead, acetonitrile and toluene mixture liquid from
Bottom of tower enters.
According to one embodiment of present invention, in the step b, using rectifying column piptonychia benzene, bottom temperature is 80 DEG C -90
℃。
According to one embodiment of present invention, in the step b, using rectifying column piptonychia benzene, tower top temperature is 70 DEG C -75
℃。
The separation method of acetonitrile provided by the invention and toluene mixture liquid can recycle again from toluene and acetonitrile mixed solution
Using acetonitrile, through the method for the present invention treated waste liquid containing acetonitrile, grade acetonitrile and toluene product can be obtained.Use the present invention
Method, not only solvent acetonitrile and toluene was utilized in Recovery and recycle, but also can reduce waste and pollution.
Specific implementation mode
The present invention is described in detail with reference to embodiment：
Embodiment 1
The separation method of acetonitrile and toluene mixture liquid, includes the following steps：
A. extraction tower, water is used to enter from extraction column overhead, acetonitrile enters with toluene mixture liquid from bottom of tower, acetonitrile and toluene
Mixed liquor is contacted with water, extraction；
B. it is 84 DEG C that the water phase of extract liquor, which uses rectifying column piptonychia benzene, bottom temperature, and tower top temperature is 70 DEG C.Tower top is
Water, acetonitrile and toluene azeotropic mixture remove toluene in water phase, and tower reactor is acetonitrile and aqueous mixtures, is carried out dehydrating to obtain industry
Grade acetonitrile product；
C. the organic phase of extract liquor obtains industrial grade toluene.
Embodiment 2
The separation method of acetonitrile and toluene mixture liquid, includes the following steps：
A. extraction tower, water is used to enter from extraction column overhead, acetonitrile enters with toluene mixture liquid from bottom of tower, acetonitrile and toluene
Mixed liquor is contacted with water, extraction；
B. it is 85 DEG C that the water phase of extract liquor, which uses rectifying column piptonychia benzene, bottom temperature, and tower top temperature is 71 DEG C.Tower top is
Water, acetonitrile and toluene azeotropic mixture remove toluene in water phase, and tower reactor is acetonitrile and aqueous mixtures, is carried out dehydrating to obtain industry
Grade acetonitrile product.
C. the organic phase of extract liquor obtains industrial grade toluene.
Embodiment 3
The separation method of acetonitrile and toluene mixture liquid, includes the following steps：
A. extraction tower, water is used to enter from extraction column overhead, acetonitrile enters with toluene mixture liquid from bottom of tower, acetonitrile and toluene
Mixed liquor is contacted with water, extraction；
B. it is 83 DEG C that the water phase of extract liquor, which uses rectifying column piptonychia benzene, bottom temperature, and tower top temperature is 69 DEG C.Tower top is
Water, acetonitrile and toluene azeotropic mixture remove toluene in water phase, and tower reactor is acetonitrile and aqueous mixtures, is carried out dehydrating to obtain industry
Grade acetonitrile product.
C. the organic phase of extract liquor obtains industrial grade toluene.
Embodiment 4
The separation method of acetonitrile and toluene mixture liquid, includes the following steps：
A. extraction tower, water is used to enter from extraction column overhead, acetonitrile enters with toluene mixture liquid from bottom of tower, acetonitrile and toluene
Mixed liquor is contacted with water, extraction；
B. it is 85 DEG C that the water phase of extract liquor, which uses rectifying column piptonychia benzene, bottom temperature, and tower top temperature is 70 DEG C.Tower top is
Water, acetonitrile and toluene azeotropic mixture remove toluene in water phase, and tower reactor is acetonitrile and aqueous mixtures, is carried out dehydrating to obtain industry
Grade acetonitrile product.
C. the organic phase of extract liquor obtains industrial grade toluene.
Embodiment 5
The separation method of acetonitrile and toluene mixture liquid, includes the following steps：
A. extraction tower, water is used to enter from extraction column overhead, acetonitrile enters with toluene mixture liquid from bottom of tower, acetonitrile and toluene
Mixed liquor is contacted with water, extraction；
B. it is 84 DEG C that the water phase of extract liquor, which uses rectifying column piptonychia benzene, bottom temperature, and tower top temperature is 71 DEG C.Tower top is
Water, acetonitrile and toluene azeotropic mixture remove toluene in water phase, and tower reactor is acetonitrile and aqueous mixtures, is carried out dehydrating to obtain industry
Grade acetonitrile product.
C. the organic phase of extract liquor obtains industrial grade toluene.
Through experimental examination, in step a, the group in charging becomes toluene 50%, acetonitrile 50%；The group of water phase becomes acetonitrile:
20%,
Water:About 80%, toluene<0.1%.In step b, azeotropic becomes acetonitrile except the product group after toluene:20%, water:
80%, toluene<100ppm.Extract toluene in organic phase>99.9%.
Embodiment in the present invention is only used for that the present invention will be described, and is not construed as limiting the scope of claims limitation,
Other substantially equivalent replacements that those skilled in that art are contemplated that, all fall in the scope of protection of the present invention.
Claims (4)
1. the separation method of acetonitrile and toluene mixture liquid, which is characterized in that include the following steps：
A. acetonitrile is contacted with toluene mixture liquid with water, extraction；
B. the heated aqueous of extract liquor carries out piptonychia benzene processing, and water, acetonitrile and toluene are azeotroped off toluene, and remaining acetonitrile is mixed with water
Object is closed to be carried out dehydrating to obtain grade acetonitrile product；
C. the organic phase of extract liquor obtains industrial grade toluene.
2. the separation method of acetonitrile according to claim 1 and toluene mixture liquid, which is characterized in that in step a, water is from extraction
Column overhead is taken to enter, acetonitrile enters with toluene mixture liquid from bottom of tower.
3. the separation method of acetonitrile according to claim 1 and toluene mixture liquid, which is characterized in that in the step b, make
With rectifying column piptonychia benzene, bottom temperature is 80 DEG C -90 DEG C.
4. the separation method of acetonitrile according to claim 1 or 3 and toluene mixture liquid, which is characterized in that the step b
In, using rectifying column piptonychia benzene, tower top temperature is 70 DEG C -75 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205636.8A CN108373426A (en) | 2018-03-13 | 2018-03-13 | The separation method of acetonitrile and toluene mixture liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205636.8A CN108373426A (en) | 2018-03-13 | 2018-03-13 | The separation method of acetonitrile and toluene mixture liquid |
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|---|---|
| CN108373426A true CN108373426A (en) | 2018-08-07 |
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| CN201810205636.8A Pending CN108373426A (en) | 2018-03-13 | 2018-03-13 | The separation method of acetonitrile and toluene mixture liquid |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109879714A (en) * | 2019-04-03 | 2019-06-14 | 河南小威环境科技有限公司 | A kind of separation and recovery method of benzene and acetonitrile mixture |
| CN110483230A (en) * | 2019-09-12 | 2019-11-22 | 新中天环保股份有限公司 | A method of recycling toluene from pharmacy class toluene solvent slop |
| CN111348982A (en) * | 2020-04-08 | 2020-06-30 | 山东博苑医药化学有限公司 | Method for separating and purifying mixed solvent containing acetonitrile, toluene and water |
| CN113461568A (en) * | 2021-06-24 | 2021-10-01 | 索闻特环保科技(上海)有限公司 | Method for treating toluene in acetonitrile waste liquid |
Citations (4)
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| CN1736530A (en) * | 2005-07-26 | 2006-02-22 | 天津大学 | Method for separating acetonitrile-methylbenzene azeotropic mixture by continuous extractive distillation |
| CN1736529A (en) * | 2005-07-26 | 2006-02-22 | 天津大学 | Batch extractive distillation separating method of acetonitrile-methylbenzene azeotropic mixtrue |
| CN103922963A (en) * | 2014-04-17 | 2014-07-16 | 河北工业大学 | Process for separating acetonitrile-water azeotrope system by adopting ionic liquid extraction distillation |
| CN107074749A (en) * | 2014-10-31 | 2017-08-18 | 旭化成株式会社 | The manufacture method of acetonitrile |
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2018
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| CN1736530A (en) * | 2005-07-26 | 2006-02-22 | 天津大学 | Method for separating acetonitrile-methylbenzene azeotropic mixture by continuous extractive distillation |
| CN1736529A (en) * | 2005-07-26 | 2006-02-22 | 天津大学 | Batch extractive distillation separating method of acetonitrile-methylbenzene azeotropic mixtrue |
| CN103922963A (en) * | 2014-04-17 | 2014-07-16 | 河北工业大学 | Process for separating acetonitrile-water azeotrope system by adopting ionic liquid extraction distillation |
| CN107074749A (en) * | 2014-10-31 | 2017-08-18 | 旭化成株式会社 | The manufacture method of acetonitrile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109879714A (en) * | 2019-04-03 | 2019-06-14 | 河南小威环境科技有限公司 | A kind of separation and recovery method of benzene and acetonitrile mixture |
| CN110483230A (en) * | 2019-09-12 | 2019-11-22 | 新中天环保股份有限公司 | A method of recycling toluene from pharmacy class toluene solvent slop |
| CN111348982A (en) * | 2020-04-08 | 2020-06-30 | 山东博苑医药化学有限公司 | Method for separating and purifying mixed solvent containing acetonitrile, toluene and water |
| CN113461568A (en) * | 2021-06-24 | 2021-10-01 | 索闻特环保科技(上海)有限公司 | Method for treating toluene in acetonitrile waste liquid |
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Application publication date: 20180807 |