Please use this identifier to cite or link to this item:
http://hdl.handle.net/123456789/883
DC Field | Value | Language |
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dc.contributor.author | Dorobantu, Maria | - |
dc.contributor.author | Zlota, Arie | - |
dc.contributor.author | Barca, Elena | - |
dc.contributor.author | Anistoroaie, Viorica | - |
dc.contributor.author | Cosaveanu, A. | - |
dc.contributor.author | Dumitrescu, I. | - |
dc.date.accessioned | 2017-04-21T21:15:08Z | - |
dc.date.available | 2017-04-21T21:15:08Z | - |
dc.date.issued | 1984-02-28 | - |
dc.identifier.other | Patent no. RO 82693-A | - |
dc.identifier.uri | http://hdl.handle.net/123456789/883 | - |
dc.description | Patent Assignee Name(s) and Code(s): COMB PETROCHIM BORZ; INST EPURAREA APELOR REZ | en_US |
dc.description.abstract | Residual H2SO4, contg. 60% H2SO4 and 27% p-toluenesulphonic acid, is stirred with water, in water:acid wt. ratio 0.1-0.5 (0.25-0.35). The reaction mixt., at 60-85 deg.C, is cooled to 0-30 (10 deg.C for 15 mins. After filtration and centrifuging, over 93%pure p-toluenesulphonic acid monohydrate crystals are recovered and also a filtrate contg. 55% H2SO4 and 7.5% toluenesulphonic acid. The filtrate can be used as such; conc. to 75% H2SO4 by mixing with conc. H2SO4 or oleum; or worked up either for complete conversion to p-toluenesulphonic acid or for the recovery of H2SO4 as Na- or Ba sulphates. The p-toluenesulphonic acid crystals obtd. in the 1st crystallization step can be purified by redissolving in water, at wt. ratio water:crystals 0.1-0.3 (0.14) at 60-100 (90) deg.C. The soln. obtd. is filtered and then cooled at 0-30 (10) deg.C to recover 98% p-toluenesulphonic acid mono-hydrate, which is sepd. by filtration and dried, esp. in vacuo, at 50-100 (80) deg.C. The filtrate obtd., contg. 65% p-toluenesulphonic acid and 4.5% H2SO4 can be recirculated to the dilution crystallization process of p toluene-sulphonic acid; or used as final prod. or purified to reduce the content of H2SO4 to less than 1%. The plant used is claimed. | en_US |
dc.language.iso | en_US | en_US |
dc.subject | p-Toluenesulphonic acid | en_US |
dc.subject | Preparation | en_US |
dc.title | Highly pure para-toluene-sulphonic acid mono:hydrate prepn. from sulphuric acid contg. para-toluene-sulphonic acid by mixing with water, cooling, filtration and crystallisation steps | en_US |
dc.title.alternative | Procedeu si instalatie de fabricare a acidului para-toluen sulfonic de puritate avansata | en_US |
dc.type | Patent | en_US |
item.grantfulltext | reserved | - |
item.openairetype | Patent | - |
item.cerifentitytype | Publications | - |
item.fulltext | With Fulltext | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.languageiso639-1 | en_US | - |
Appears in Collections: | Patents |
Files in This Item:
File | Description | Size | Format | Existing users please |
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Documentatie RO82693A.pdf | 41.67 kB | Adobe PDF | Request a copy | |
~RO82693A.pdf | 92.55 kB | Adobe PDF | Request a copy |
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