The invention relates to a process for preparing a C
8
-C
24
alkyl(meth)acrylate by transesterification of methyl(meth)acrylate with a C
8
-C
24
alkanol, said process comprising the steps of:
(i) reacting methyl(meth)acrylate with the C
8
-C
24
alkanol in the presence of a tin-comprising catalyst and a stabilizer in the presence of an entraining agent which forms an azeotrope with methanol,
(ii) continuously distilling off the azeotrope of entraining agent and methanol wherein steps (i) and (ii) are carried out simultaneously until the C
8
-C
24
alkanol has been substantially completely reacted,
(iii) washing with an aqueous alkaline washing solution the C
8
-C
24
alkyl (meth)acrylate-comprising product mixture obtained in steps (i) and (ii) to remove from the product mixture the tin-comprising catalyst and at least some of the stabilizer,
(iv) distilling off unconverted methyl(meth)acrylate and entraining agent from the product mixture,
(v) distilling off water from the product mixture
wherein a product having a by-product content of <
0.5
% by weight is obtained after step (v) and step (iv) may also be carried out before step (iii) and steps (iv) and (v) may also be carried out in one distillation step.
该发明涉及一种通过甲基(甲基)
丙烯酸酯与C8-C24烷基醇发生酯交换反应制备C8-C24烷基(甲基)
丙烯酸酯的方法,该方法包括以下步骤:(i) 在
锡催化剂和稳定剂的存在下,在与
甲醇形成共沸物的夹带剂的存在下,将甲基(甲基)
丙烯酸酯与C8-C24烷基醇反应;(ii) 连续蒸馏出夹带剂和
甲醇的共沸物,直到C8-C24烷基醇基本完全反应;(iii) 用含碱性洗涤溶液对步骤(i)和(ii)得到的C8-C24烷基(甲基)
丙烯酸酯混合物进行洗涤,以去除混合物中的
锡催化剂和至少一部分稳定剂;(iv) 从产物混合物中蒸馏出未反应的甲基(甲基)
丙烯酸酯和夹带剂;(v) 从产物混合物中蒸馏出
水,其中在步骤(v)后获得含有<0.5%重量的副产物含量的产品,步骤(iv)也可以在步骤(iii)之前进行,步骤(iv)和(v)也可以在一个蒸馏步骤中进行。