反应详情

1 200 Parts of p-tert-butylphenol, 800 parts of xylene, 240 parts of sodium hydroxide solution and 1 296 parts of 37% aqueous formaldehyde are reacted as in Example 1 in the apparatus of Example 1 until the formaldehyde content is 1.7%. Then, as in Example 1, the pH is adjusted to 5.5 with 25% sulphuric acid, followed by working up. 1 568 Parts of furfuryl alcohol are then added and 450 ml of aqueous phase is azeotropically distilled off at maximum temperature of 177° C. as in Example 1. After distilling off the entrainer at 130° C./100 mbar, 1 225 parts of furfuryl alcohol are added and 3 890 parts of a furan resin solution are obtained having a residue of 60% (1 hour/170° C.) and a viscosity of 4 750 mPa.s/20° C.

1. distillation450 ml of aqueous phase is azeotropically distilled off at maximum temperature of 177° C. as in Example 1
2. distillationAfter distilling off the entrainer at 130° C./100 mbar, 1 225 parts of furfuryl alcohol
3. additionare added