CLT acid
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| General | |||||||||||||||||||
| Surname | CLT acid | ||||||||||||||||||
| other names |
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| Molecular formula | C 7 H 8 ClNO 3 S | ||||||||||||||||||
| Brief description |
white to slightly reddish powder |
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| properties | |||||||||||||||||||
| Molar mass | 221.664 g mol −1 | ||||||||||||||||||
| Physical state |
firmly |
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| Melting point |
> 400 ° C |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
The CLT acid is a chemical compound from the group of toluenesulfonic acids . It is used as a diazo component in the synthesis of azo dyes .
use
By diazotization of the CLT-acid with sodium nitrite and hydrochloric acid and subsequent coupling with 2-naphthol to obtain the sodium salt of Pigment Red 53 (Lake Red C). By laking with barium salts 1 which is used in large amounts primarily in printing inks: obtained Pigment Red 53rd The strontium and calcium salts (Pigment Red 53: 3 and Pigment Red 53: 2) are also known, but of lesser economic importance.
Individual evidence
- ↑ Chemicalland21: data sheet CLT-ACID
- ↑ a b c Data sheet 2-AMINO-5-CHLORO-P-TOLUENESULFONIC ACID, Aldrich at Sigma-Aldrich , accessed on July 4, 2014 ( PDF ).
- ↑ Willy Herbst, Klaus Hunger: Industrial Organic Pigments . Wiley-VCH, Weinheim 2009, ISBN 978-3-527-62496-6 , pp. 196 f . ( limited preview in Google Book search).
- ↑ Patent EP0965617 : New crystal modification of the pigment CI Pigment Red 53: 2 (gamma phase). Registered on June 5, 1999 , published on December 22, 1999 , applicant: Clariant GmbH, inventor: Martin U. Schmidt, Hans Joachim Metz.