| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6b4a80ac02f1ecd0e698ec665e9b36b6 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C229-60
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C235-70
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C231-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C227-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C69-76
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-307
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C227-18 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C229-60
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C229-58
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C227-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C209-56 |
| filingDate |
2003-02-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2006-03-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f1e2a3308a469d1285e7d5c14fb60c43
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bd88f1e11257f7f7141317c014a223c9
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0af53ee8559251fb1e8cd5ce34d62dac
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e5a2f75eacd93130a6942cb8ad981a40 |
| publicationDate |
2006-03-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
TW-I250971-B |
| titleOfInvention |
Method for preparing p-aminobenzoic acid |
| abstract |
The method for preparing p-aminobenzoic acid using methyl-4-formylbenzoate as a starting material, which is a major by-product produced while synthesizing dimethylterephthalate is disclosed. The method comprises the steps of: chlorinating methyl-4-formylbenzoate to produce methyl-4-chloroformylbenzoate; amidating the methyl-4-chloroformylbenzoate to produce methyl-4-carbamoylbenzoate; and carrying out Hofmann reaction with the produced methyl-4-carbamoylbenzoate in aqueous solution. During the steps for preparing p-aminobenzoic acid, impurities in the methyl-4-formylbenzoate are removed. |
| priorityDate |
2002-02-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |