[CH2:1]([OH:5])[CH:2]([OH:4])[CH3:3].[B:6]([OH:9])([OH:8])[OH:7].O>C1(C)C(C)=CC=CC=1>[B:6]([OH:9])([OH:8])[OH:7].[CH2:1]([OH:5])[CH:2]([OH:4])[CH3:3]A solution of propylene glycol borate in xylene is prepared by heating at 50° C. while stirring a mixture of 46.4 g propylene glycol, 41 g boric acid and 300 ml xylene. The water formed is eliminated by azeotropic distillation. There are obtained 314 g of a solution with 2.6% boron; in the reactor described above in Example 1 there are introduced 34.6 g of the propylene glycol borate solution, 16.61 g C16 -alkyl benzene sulfonic acid with 96% of active matter and a molecular weight of 430, 24.4 g diluent oil, 112 ml xylene, 7 ml methanol and 23.8 g slaked lime with a purity of 99%.
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