http://rdf.ncbi.nlm.nih.gov/pubchem/patent/TW-I737799-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_696ca0ae93d5cf5a686273601361781f |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-215 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D2009-009 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C63-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-43 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-47 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-487 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D9-0059 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-265 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-43 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-265 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-47 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C63-26 |
| filingDate | 2017-09-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-09-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7df40c2f4f15580768f33229fb3be779 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_266e70684df1880e3fc82eb6816cf815 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_09f4a18b201d95f3c90038b7bcc9a6a9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_aad42afde9573622fdd8aaeb82aeb9f9 |
| publicationDate | 2021-09-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | TW-I737799-B |
| titleOfInvention | Method of producing high-purity terephthalic acid |
| abstract | A method of producing a high-purity terephthalic acid, comprising steps (a) to (e) described below: (a) a step of performing a liquid-phase oxidation of a p-phenylene compound to obtain crude terephthalic acid crystals, (b) a step of dissolving the crude terephthalic acid crystals in water, and then performing a catalytic hydrogenation treatment, (c) a step of subjecting the reaction liquid from the catalytic hydrogenation to stepwise reductions in pressure and temperature using a crystallization tank having two or more stages, thereby crystallizing the terephthalic acid and obtaining a terephthalic acid slurry, (d) a step of introducing the terephthalic acid crystal slurry into the upper portion of a mother liquor substitution tower, bringing the terephthalic acid crystals into contact with a rising stream of substitution water introduced from the bottom of the mother liquor substitution tower while the crystals settle down through the inside of the tower, and extracting the terephthalic acid crystals from the bottom of the tower as a slurry with the substitution water, and (e) a step of subjecting the slurry extracted from the bottom of the tower to a solid-liquid separation to obtain water and terephthalic acid crystals, and then drying the separated terephthalic acid crystals, wherein if the amount of crystals treated in the catalytic hydrogenation treatment is termed Q [ton/hr], the residence time in the first stage crystallization tank of the crystallization tank having two or more stages is termed T 1 n[hr], and the cross-sectional area of the mother liquor substitution tower is termed A [m 2 n], then all of the following conditions (1) to (3) are satisfied: (1) 0.07 ≤ T 1 n≤ 0.5 (2) 0.3 ≤ A/Q ≤ 0.8 (3) 0.035 ≤ T 1 n×A/Q ≤ 0.25 By using this method, mother liquor substitution occurs efficiently, the heating load when drying the purified terephthalic acid cake following the solid-liquid separation is small, and a terephthalic acid that exhibits favorable behavior as a polyester raw material can be produced. |
| priorityDate | 2016-09-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 40.