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ECOLIB DIGITAL REPOSITORY is the institutional repository of National Research and Development Institute for Industrial Ecology ECOIND.
ECOLIB ensures preservation and management of documents and provides access to: articles of the ECOIND researchers published in national and international journals (full-paper/abstract), doctoral theses (abstract), conference and workshop papers, short description of the projects developed from 2006 till present, Proceedings of the International Symposium - Environment and Industry. The digital documents submitted in ECOLIB are indexed in Google Scholar.
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http://hdl.handle.net/123456789/870| Title: | Para-toluene-sulphonic acid prepn. by treating di:para-tolyl-tri:chloroethane prodn. residue, contg. sulphuric acid and toluene-sulphonic acid, with toluene | Other Titles: | Procedeu si instalatie de fabricare a diparatolil tricloretanului | Authors: | Dorobantu, Maria Zlota, Arie Barca, Elena |
Keywords: | Para-toluene-sulphonic acid;Preparation | Issue Date: | 30-Nov-1982 | Abstract: | Para-toluene-sulphonic acid is prepd. by using the residue from di-p-tolyl-trichloroethane prodn. which contains 60% H2SO4 and 27% toluene-sulphonic acid. The residue is treated with toluene in ratio 1 : 1 to 1 : 4 (1 :1 :8), with stirring and heating, at 84-140 (110-114) deg.C. Unreacted and excess toluene distil azeotropically with water. After sepg. the water toluene layers, the water is discharged from process. Toluene is recirculated. Re-fluxing is continued 5-24 hrs., when the sulpho-mass contains 1-6% H2SO4. After cooling to 50-100 (70) deg.C, the vacuum distn. of excess toluene is continued. The excess toluene is reused in process. The resulting sulpho-mass contains 85% p-toluene-sulphonic acid. |
Description: | Patent Assignee Name(s) and Code(s): COMB PETROCH BORZES; INST EPURAREA APELOR REZ |
URI: | http://hdl.handle.net/123456789/870 |
| Appears in Collections: | Patents |
Files in This Item:
| File | Description | Size | Format | Existing users please |
|---|---|---|---|---|
| Documentatie~RO80441A.pdf | 25.34 kB | Adobe PDF | Request a copy | |
| ~RO80441A.pdf | 90.22 kB | Adobe PDF | Request a copy |
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