Reaktion #1946548

Reaktionsgleichung

salicylic acid

formaldehyde

hydrochloric acid

→

salicylic acid formaldehyde

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeIn a reactor fitted with a condenser, addition funnel and a mechanical stirrer
2. 2
   workup.ADDITIONis added
3. 3
   workup.ADDITIONDuring the addition
4. 4
   Temperaturcooled to room temperature
5. 5
   FiltrationThe resulting polymer precipitate is filtered
6. 6
   workup.DISSOLUTIONdissolved in water (200 mL)
7. 7
   workup.ADDITIONcontaining 50% aqueous sodium hydroxide (26 mL) for performance testing

Vorschrift

In a reactor fitted with a condenser, addition funnel and a mechanical stirrer, deionized water (300 g) is heated to 95° C. At this temperature, a mixture of powdered salicylic acid (40 g) and boric anhydride (0.2 g) is added. Aqueous formaldehyde (40%, 35 mL), pre-acidified with hydrochloric acid (6.5 mL, 1.19 density), is then added over 15 minutes. During the addition, the reaction temperature is maintained at 90-100° C. The reaction mixture is stirred for 60 minutes at 95° C. and then cooled to room temperature. The resulting polymer precipitate is filtered and dissolved in water (200 mL) containing 50% aqueous sodium hydroxide (26 mL) for performance testing.

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