CN102212025B - Method for improving rectification yield of nitrated product - Google Patents
Method for improving rectification yield of nitrated product Download PDFInfo
- Publication number
- CN102212025B CN102212025B CN 201110089479 CN201110089479A CN102212025B CN 102212025 B CN102212025 B CN 102212025B CN 201110089479 CN201110089479 CN 201110089479 CN 201110089479 A CN201110089479 A CN 201110089479A CN 102212025 B CN102212025 B CN 102212025B
- Authority
- CN
- China
- Prior art keywords
- tar
- rectification
- washing
- aqueous solution
- nitrated product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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 rectification yield of nitrated product.
Background technology
Nitration product refers to contain in molecular structure phenyl ring, through the mixture that nitration reaction obtains, is important organic raw material in the productions such as current chemical industry, medicine, agricultural chemicals.
Yet easily the set off an explosion gathering of hazardous material of nitration product rectifying improve as the nitrophenol sodium salt content, and the too high factors such as tower reactor temperature all easily causes the blast of rectifying tower reactor.For fear of serious tower reactor explosion hazard occurs, cause great personnel's injury, financial loss and bad social influence, general rectifying with nitration reaction is controlled at lower temperature to be carried out, like this, the tar that has but caused tower reactor to be discharged is more, has affected the rectification yield of tower reactor.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method that improves rectification yield of nitrated product, 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 comprised of Soxylat A 25-7 and lauric acid, tar circulation after washing enters in the feed system of rectifying tower, carries out rectifying separation.
Preferably, described washing auxiliary detergent is comprised 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 rectification yield, made the rectification yield of product bring up to 98% by existing 95%, the corresponding tar emission that reduced, prevented effectively that again tower reactor from blasting, guaranteed rectifier unit steady running.
Embodiment
The invention provides a kind of method that improves rectification yield of nitrated product, 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 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, the tar of discharging for rectifying tower adopts the aqueous solution of equal proportion to wash, added 1% washing auxiliary detergent in the aqueous solution used, this washing auxiliary detergent is comprised of 50% Soxylat A 25-7 and 50% lauric acid, tar circulation after 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 rectification yield of product brings up to 98% by existing 95%, and the corresponding tar emission that reduced has prevented effectively that again tower reactor from blasting, and guarantees rectifier unit steady running.
Claims (4)
1. method that improves rectification yield of nitrated product, 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 comprised of Soxylat A 25-7 and lauric acid, tar circulation after washing enters in the feed system of rectifying tower, carries out rectifying separation.
2. improve as claimed in claim 1 the method for rectification yield of nitrated product, it is characterized in that, described washing auxiliary detergent is comprised of 50% Soxylat A 25-7 and 50% lauric acid.
3. improve as claimed in claim 2 the method for rectification yield of nitrated product, it is characterized in that, contain 1% washing auxiliary detergent in the described aqueous solution.
4. as described in as arbitrary in claim 1-3, the method for raising rectification yield of nitrated product, is characterized in that, when the tar output reaches 5%, adopts 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 CN102212025A (en) | 2011-10-12 |
| CN102212025B true CN102212025B (en) | 2013-06-05 |
Family
ID=44743593
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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102212025B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4337347B2 (en) * | 2003-01-09 | 2009-09-30 | 三菱化学株式会社 | Method for producing phenol |
| CN100556989C (en) * | 2007-10-17 | 2009-11-04 | 上海奥韦通工程技术有限公司 | A kind of method of from coal tar, extracting multiple Chemicals |
-
2011
- 2011-04-11 CN CN 201110089479 patent/CN102212025B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102212025A (en) | 2011-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20160185711A1 (en) | Process and Device for Recycling Waste Acid Produced in Process of Producing Zoalene | |
| CN104874196B (en) | A kind of method processing sodium and ammonium acetate salt-diazonium Organic substance-methanol-water mixed solution | |
| CN102212025B (en) | Method for improving rectification yield of nitrated product | |
| CN102649770A (en) | Production method of high-content acetochlor by methylene method | |
| CN101456857A (en) | Method for preparing high-purity annular sulfuric acid ester | |
| CN107033005B (en) | Nitration method of aromatic compound | |
| CN102757356A (en) | Splitting process of racemic para hydroxybenzene glycine | |
| CN111138250B (en) | Refining method of chlorphenesin | |
| CN105646127A (en) | Preparation method of chromatographic-grade petroleum ether with boiling range of 30-60 | |
| CN104926692A (en) | Preparation process for bromoxynil octanoate | |
| CN104592050A (en) | Method for recovering N, N-dimethylacetamide solvent used in production of spandex | |
| CN102731299B (en) | Liquid-liquid extraction separation method of methyl propionate-methanol-water azeotropic system | |
| CN102212011B (en) | Method for preventing nitration product rectifying tower from exploding | |
| CN105622320A (en) | Method for preparing petroleum ether with chromatographic grade boiling range 60-90 | |
| CN109289930B (en) | Method for efficiently separating and purifying 1-methylnaphthalene | |
| CN102675120A (en) | Preparation method of 3, 4-dichloronitrobenzene by solid acid catalyst | |
| CN106866416A (en) | A kind of method for preparing the fluoro- 2- alkoxies trifluoropropyl acid esters of 2- | |
| CN101328112B (en) | Butanone-water system cross-flow liquid-liquid extraction separation method | |
| CN104447411A (en) | Refining method for normal-butyl isocyanate | |
| CN105906488B (en) | A kind of purification purifying plant for by-product diisopropyl ether in isopropyl alcohol production | |
| CN102503802A (en) | Acetic acid extracting agent | |
| CN107868006B (en) | A kind of method of purification of the chloro- 4,6- dinitroresorcinol of 2- | |
| CN103030535B (en) | Purification method of dimethoxymethane | |
| CN105017087A (en) | Pretreatment technology for diuron recovered solvent | |
| CN106316772A (en) | Chlorination separation method of synthetic rubber ultrapure chlorobenzene |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |