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以对甲苯磺酸和十八水合硫酸铝为催化剂合成对羟基苯甲酸正丁酯。与浓硫酸相比，用对甲基苯磺酸和Ａｌ＿２（ＳＯ＿４）＿３·１８Ｈ＿２Ｏ作催化剂可获得较高产率的酯，反应时间短，副反应少，三废排放量少，产物易分离提纯，且Ａｌ＿２（ＳＯ＿４）＿３·１８Ｈ＿２Ｏ可望循环使用。
Synthesis of n - Butyl p - hydroxybenzoate with p - Toluene sulfonic acid and aluminum sulfate octadecahydrate as catalysts. Compared with concentrated sulfuric acid, using p-toluenesulfonic acid and Al 2 (SO 4) 3 · 18H 2 O as catalysts, higher yields of esters can be obtained with short reaction time, few side reactions and less waste of three wastes. The products are easily separated and purified Al_2 (SO_4) _3 · 18H_2O is expected to be recycled.