http://rdf.ncbi.nlm.nih.gov/pubchem/patent/TW-I230151-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a6f3cfe0ddb2022c13434709eb7f3e0a |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-42 |
| filingDate | 1998-09-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2005-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_dfb820d4bc93d4e803cd974c883fbb69 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0710a103cd08ba60cc18e58e65c215c9 |
| publicationDate | 2005-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | TW-I230151-B |
| titleOfInvention | Method of recovering p-hydroxybenzoic acid from the waste water from the process of producing p-hydroxybenzoic acid |
| abstract | The present invention relates to a method of recovering p-hydroxybenzoic acid from the waste water from the process of producing p-hydroxybenzoic acid, comprising extraction of p-hydroxybenzoic acid from the waste water from the process of producing p-hydroxybenzoic acid by using organic solvents, and then extraction of p-hydroxybenzoic acid solved in the organic solvents by using basic solvents, followed by acidification and solid-liquid separation thereof, so as to obtain the crude crystal of p-hydroxybenzoic acid. The crude crystal of p-hydroxybenzoic acid can further produce p-hydroxybenzoic acid having higher purity through a re-crystallization step, or carry the esterification or etherification reaction out directly without purification, so as to obtain highly pure ester or ether compounds of p-hydroxybenzoic acid. According to the method of the present invention, the organic solvents for extraction, which can be reused repeatedly, not only recover the useful product, p-hydroxybenzoic acid, but also reduce the chemical oxygen demand (COD) in the waste water from the process of producing p-hydroxybenzoic acid by a half thereof or more; thus the expenses for treating the waste water are greatly reduced, and the purpose of industrial waste abatement is also achieved. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-114275966-A |
| priorityDate | 1998-09-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 72.