申请人:ETHYL CORPORATION
公开号:EP0116712A1
公开(公告)日:1984-08-29
A process for the production of 2,6-di-tert-butyl-a-methoxy-p-cresol and high molecular weight hindered phenols produced therefrom. A process is disclosed for the production of the methyl ether of 2,6-di-tert-butyl-p-cresol in such a manner that allows subsequent production of 1,3,5,- trimethyl-2,4,6-tris (3,5,- di-tert-butyl-4-hydroxybenzyl) benzene in the same pot. The process permits substitution of the methanol solvent/reactant with a hydrocarbon or halogenated hydrocarbon solvent to produce the high molecular weight hindered phenol. This aspect of the invention reduces production cost by eliminating expensive centrifugation associated with prior art processes. The process also conserves catalyst by recycling it in the excess methanol. The catalyst is a Mannich base such as 2,6-di-tert-butyl-a-dimethylamino-p-cresol formed from the reactants 2,6-di-tert-butylphenol and formaldehyde with dimethylamine. The invention is an important improvement over prior art processes in that the production of bisphenol coproducts, notably 4,4'-methylenebis(2,6-di-tert-butylphenol) is low.
一种生产 2,6-二叔丁基-a-甲氧基对甲酚和由此生产的高分子量受阻酚的工艺。本发明公开了一种生产 2,6-二叔丁基对甲酚甲醚的工艺,该工艺允许在同一锅中随后生产 1,3,5,-三甲基-2,4,6-三(3,5,-二叔丁基-4-羟基苄基)苯。该工艺允许用碳氢化合物或卤代碳氢化合物溶剂替代甲醇溶剂/反应剂,以生产高分子量受阻苯酚。本发明省去了现有技术工艺中昂贵的离心分离,从而降低了生产成本。该工艺还通过在过量甲醇中回收催化剂来节省催化剂。催化剂是一种曼尼希碱,如 2,6-二叔丁基-a-二甲氨基对甲酚,由 2,6-二叔丁基苯酚和甲醛与二甲胺反应生成。与现有技术相比,本发明的重要改进在于双酚副产物,特别是 4,4'-亚甲基双(2,6-二叔丁基苯酚)的产量较低。