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Process for the preparation of crystallized, salt-free chlorine-substituted 3-nitrobenzenesulfonic acid hydrates
Process for the preparation of crystallized, salt-free chlorine-substituted 3-nitrobenzenesulfonic acid hydrates
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机译：结晶的，无盐的氯取代的3-硝基苯磺酸水合物的制备方法
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摘要
The present invention relates to a process for the preparation of crystallised salt-free chloro-substituted 3-nitrobenzenesulphonic acid hydrates from sulphonation mixtures containing chloro-substituted 3-nitrobenzenesulphonic acid, by mixing the sulphonation mixture with 8 to 25% by weight of aqueous sulphuric acid at 40 to 100@C, cooling the resulting suspension to 5 to 20@C, filtering off the precipitate, dissolving the precipitate using water at 30 to 100@C, optionally filtering, cooling the solution to 5 to 40@C, filtering and optionally recycling the sulphuric acid-containing filtrate.
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