Fierz-David, H. E. (Hans Eduard), b. 1882, Mason, Frederick Alfred, 1888- · New York, D. Van Nostrand · leaf 72
SULPHONATIONS 47 If the process be carried out exactly in accordance with the patent very unsatisfactory results will be obtained as, according to this, the alcohol is simply distilled off. It is far better to filter off the separated product on a nutsch, and to press out the mass in a screw-press.… … FIG. 9. — Heating under reflux condenser with any excess ; Congo paper stirring. should not be turned pure blue, but just a definite faint violet. After two days the product is filtered off and washed in a very little water. The yield is about 125 gms. pure substance, or about 66 % of theory. Notes…
Dyes and dyeing -- Chemistry
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