CN102212025A - Method for improving rectification yield of nitrated product - Google Patents
Method for improving rectification yield of nitrated product Download PDFInfo
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- CN102212025A CN102212025A CN2011100894797A CN201110089479A CN102212025A CN 102212025 A CN102212025 A CN 102212025A CN 2011100894797 A CN2011100894797 A CN 2011100894797A CN 201110089479 A CN201110089479 A CN 201110089479A CN 102212025 A CN102212025 A CN 102212025A
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- tar
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- aqueous solution
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Abstract
The invention relates to a method for improving rectification yield of a nitrated product. The method comprises the following steps: washing tar discharged from a rectifying tower in an isometric aqueous solution, wherein 1% of washing adjuvant is contained in the aqueous solution, and the washing adjuvant consists of 50% of polyoxyethylene ether and 50% of lauric acid; and circularly enabling the washed tar to enter into the feeding system of the rectifying tower for rectification and separation. In the method, harmful substances are removed through washing the tar, and circular rectification is carried out, thus the rectification yield is improved from 95% at present to 98%, the discharging of the tar is correspondingly reduced, and the explosion of a tower kettle is effectively prevented so that the stable operation of a rectification device can be ensured.
Description
Technical field
The present invention relates to a kind of method that improves nitration product rectifying yield.
Background technology
Nitration product is meant and contains phenyl ring in the molecular structure, through the mixture that nitration reaction obtains, is important organic raw material in productions such as current chemical industry, medicine, agricultural chemicals.
Yet set off an explosion the easily gathering of hazardous material of nitration product rectifying improve as the nitrophenol sodium salt content, and too high factors such as tower still temperature all causes the blast of rectifying tower still easily.For fear of serious tower still explosion hazard takes place, cause great personnel's injury, financial loss and bad social influence, general rectifying with nitration reaction is controlled under the lower temperature to be carried out, like this, the tar that has but caused the tower still to be discharged is more, has influenced the rectifying yield of tower still.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method that improves nitration product rectifying yield, the tar that rectifying tower is discharged adopts the aqueous solution of equal proportion to wash, contain washing auxiliary detergent in the described aqueous solution, described washing auxiliary detergent is made up of Soxylat A 25-7 and lauric acid, tar circulation after the washing enters in the feed system of rectifying tower, carries out rectifying separation.
Preferably, described washing auxiliary detergent is made up of 50% Soxylat A 25-7 and 50% lauric acid.
Preferably, contain 1% washing auxiliary detergent in the described aqueous solution.
The present invention removes objectionable impurities by tar is washed, circulation rectifying, improved the rectifying yield, made the rectifying yield of product bring up to 98%, correspondingly reduced the tar discharging by existing 95%, prevented effectively that again the tower still from blasting, guaranteed rectifier unit steady running.
Embodiment
The invention provides a kind of method that improves nitration product rectifying yield, the tar that existing rectifier unit is discharged adopts the aqueous solution of the equal proportion that contains washing auxiliary detergent to wash, tar circulation after the washing enters in the feed system of rectifying tower, carries out rectifying separation.
Specific embodiment is as follows:
In existing nitration product rectifying, when the tar output reaches 5% left and right sides, the tar of discharging for rectifying tower adopts the aqueous solution of equal proportion to wash, added 1% washing auxiliary detergent in the aqueous solutions employed, this washing auxiliary detergent is made up of 50% Soxylat A 25-7 and 50% lauric acid, tar circulation after the washing enters in the feed system of rectifying tower, carries out rectifying separation, can make the output of tar drop to 2%.
By adopting method of the present invention, the rectifying yield of product brings up to 98% by existing 95%, has correspondingly reduced the tar discharging, has prevented effectively that again the tower still from blasting, and guarantees rectifier unit steady running.
Claims (4)
1. method that improves nitration product rectifying yield, it is characterized in that, the tar that rectifying tower is discharged adopts the aqueous solution of equal proportion to wash, contain washing auxiliary detergent in the described aqueous solution, described washing auxiliary detergent is made up of Soxylat A 25-7 and lauric acid, tar circulation after the washing enters in the feed system of rectifying tower, carries out rectifying separation.
2. improve the method for nitration product rectifying yield according to claim 1, it is characterized in that, described washing auxiliary detergent is made up of 50% Soxylat A 25-7 and 50% lauric acid.
3. as the method for raising nitration product rectifying yield as described in the claim 2, it is characterized in that, contain 1% washing auxiliary detergent in the described aqueous solution.
As claim 1-3 arbitrary as described in the method for raising nitration product rectifying yield, it is characterized in that, when the tar output reaches 5%, adopt the arbitrary described method of claim 1-3 that tar is washed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110089479 CN102212025B (en) | 2011-04-11 | 2011-04-11 | Method for improving rectification yield of nitrated product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110089479 CN102212025B (en) | 2011-04-11 | 2011-04-11 | Method for improving rectification yield of nitrated product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102212025A true CN102212025A (en) | 2011-10-12 |
| CN102212025B CN102212025B (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110089479 Active CN102212025B (en) | 2011-04-11 | 2011-04-11 | Method for improving rectification yield of nitrated product |
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| CN (1) | CN102212025B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108997124A (en) * | 2017-06-06 | 2018-12-14 | 中国石油化工股份有限公司 | A method of recycling nitrobenzene from nitrobenzene tar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004217529A (en) * | 2003-01-09 | 2004-08-05 | Mitsubishi Chemicals Corp | Method for treating phenol tar |
| CN101139527A (en) * | 2007-10-17 | 2008-03-12 | 上海奥韦通工程技术有限公司 | Method for extracting multiple chemical products from coal-tar oil |
-
2011
- 2011-04-11 CN CN 201110089479 patent/CN102212025B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004217529A (en) * | 2003-01-09 | 2004-08-05 | Mitsubishi Chemicals Corp | Method for treating phenol tar |
| CN101139527A (en) * | 2007-10-17 | 2008-03-12 | 上海奥韦通工程技术有限公司 | Method for extracting multiple chemical products from coal-tar oil |
Non-Patent Citations (1)
| Title |
|---|
| 桑枝茂: "焦油洗涤的技术改造", 《包钢科技》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108997124A (en) * | 2017-06-06 | 2018-12-14 | 中国石油化工股份有限公司 | A method of recycling nitrobenzene from nitrobenzene tar |
| CN108997124B (en) * | 2017-06-06 | 2020-11-10 | 中国石油化工股份有限公司 | Method for recovering nitrobenzene from nitrobenzene tar |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102212025B (en) | 2013-06-05 |
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