申请人:Buckley William Paul
公开号:US20060025622A1
公开(公告)日:2006-02-02
The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.0 during at least some portion of the reaction, and (ii) the brine strength of the aqueous phase is adjusted, if necessary, by varying the concentration of the alkali metal hydroxide solution being added to maintain the pH such that the brine strength is between 15% and a saturated brine solution during at least some portion of the reaction: thereby forming an ester-substituted diaryl carbonate, wherein the reaction mixture is formed with less than 15% water of formulation, and wherein the brine strength is maintained at or above 15% and the pH is maintained at or above 9 for a sufficient portion of the process that the ester-substituted diaryl carbonate is formed with a conversion of at least 90% and a selectivity of at least 98%.
本发明涉及一种制备酯基取代二芳基碳酸酯的界面方法。该方法包括以下步骤:形成包括光气、酯基取代酚、有机溶剂和选择自三级胺催化剂和相转移催化剂组的催化剂的反应混合物,所述反应混合物具有有机相和水相,其中所述水相具有盐度;允许反应混合物反应,其中在反应过程中,(i)水相具有pH值,如有必要,通过加入碱金属氢氧化物溶液的量来调整pH值,使pH值在反应的至少某些部分期间大于或等于9.0,并且(ii)如有必要,通过改变添加的碱金属氢氧化物溶液的浓度来调整水相的盐度,以保持pH值,使盐度在反应的至少某些部分期间在15%和饱和盐水溶液之间:从而形成酯基取代二芳基碳酸酯,其中所述反应混合物形成时含有少于15%的配方水,并且其中盐度保持在或高于15%,pH值保持在或高于9,以使酯基取代二芳基碳酸酯在过程的足够部分时间内以至少90%的转化率和至少98%的选择性形成。