http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-111848410-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_db1eaa23a60ef198db3cb09784c5672e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C209-68 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C211-52 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C209-68 |
| filingDate | 2020-07-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_65818de68f4f94045569ade4195f402a |
| publicationDate | 2020-10-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-111848410-A |
| titleOfInvention | A kind of preparation method of 2-nitro-aniline |
| abstract | The present application discloses a method for preparing 2-nitro-aniline, that is, under the condition that a high-boiling point high-polarity solvent is used as a reaction solvent and an inorganic acid, the temperature is controlled to be 100-140° C. to prepare 2-nitro-4-sulfonic acid The acid-based aniline is subjected to a desulfonation reaction at normal pressure, and after the reaction is completed, the high-boiling point and high-polarity solvent is removed by concentration under reduced pressure, then water is added and mixed, and the pH value is adjusted to 8-10, followed by extraction, washing, concentration and drying to obtain 2- Nitro-aniline, high-boiling point and high-polarity solvent can be recovered and reused after reaction. The preparation method carries out the normal pressure desulfonation reaction in a relatively low temperature range, the energy consumption in the preparation process is low, and at the same time, the waste salt generated is less, and only 2.7-3.3 tons of sulfuric acid are generated per ton of 2-nitro-aniline. Sodium, and finally the purity (HPLC) of the 2-nitro-aniline product obtained is greater than 97%, and the yield can reach up to 91%. |
| priorityDate | 2020-07-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 56.