FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to an improved method for isolation of 4-nitrotolunene used as raw for synthesis of dyes, high-strength fibers, toluylene diisocyanates, novocain and biologically active substances. Invention describes a method for isolation of 4-nitrotoluene from a mixture of isomers of mononitrotoluene by freezing out method wherein freezing out is carried out from mononitrotoluene isomers mixture, from nitrotoluenes mixture containing up to 20% of dinitrotoluenes in the presence of organic solvent, preferably, isopropyl alcohol or its azeotrope with water. Proposed method provides preparing the end product with the yield up to 42% and purity above 98%.
EFFECT: improved isolation method.
1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF EXTRACTING 4-NITROTOLUENE | 2014 |
|
RU2560882C1 |
| METHOD OF OBTAINING MONONITROTOLUENE WITH INCREASED P-ISOMER CONTENT | 2007 |
|
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| METHOD OF TWO-STAGE OBTAINING OF DINITROTOLUENE | 2004 |
|
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| METHOD OF PRODUCING AROMATIC NITRO COMPOUNDS | 2008 |
|
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| EXPLOSIVE SUBSTANCE (VERSIONS) | 2015 |
|
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| METHOD OF SYNTHESIS OF MONONITROTOLUENES | 1995 |
|
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| METHOD OF OBTAINING 4-HYDROXYLAMINO-2,6-DINITROTOLUENE AND 3,5 DINITRO-1 - HYDROXYLAMINOBENZOL | 2007 |
|
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| METHOD OF REMOVING AND RECOVERING MIXTURES OF NITRATING ACIDS FROM NITRATION PROCESSES AND INDUSTRIAL NITRATION INSTALLATION | 2006 |
|
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| METHOD OF PRODUCING A MIXTURE OF DINITROTOLUENE AND TRINITROTOLUENE (VERSIONS) | 2019 |
|
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| METHOD AND INSTALLATION FOR CONCENTRATING SPENT SULPHURIC ACID FROM NITRATION PROCESSES | 2007 |
|
RU2404917C2 |
