申请人:——
公开号:US20040147790A1
公开(公告)日:2004-07-29
A method for producing 4,4′-biphenol, comprising the steps of:
preparing serially arranged reaction bathes for two or more steps; and
carrying out a debutylation reaction of 3,3′,5,5′-tetra-t-butyl-4,4′-biphenol sequentially in the presence of an acid catalyst in a reaction solvent by supplying at least one kind of phenols selected from the group consisting of phenol, monoalkylphenols, dialkylphenols, and trialkylphenols, in a proportion of at least 0.5 mole part relative to one mole part of 3,3′,5,5′-tetra-t-butyl-4,4′-biphenol, to each reaction bath as a solvent for addition,
wherein the number of carbon atoms of alkyl groups in alkylphenols consisting of the monoalkylphenols, dialkylphenols, and trialkylphenols, is each independently in the range of 1 to 4, and
wherein a solvent for addition to a reaction bath for the latter step has a smaller average number of alkyl groups than a solvent for addition to a reaction bath for the former step.
一种制备4,4'-联苯酚的方法,包括以下步骤:为两个或更多步骤准备串联排列的反应槽;在反应溶剂中,在酸催化剂的存在下,按顺序对3,3'-四-t-丁基-4,4'-联苯酚进行去丁基化反应,向每个反应槽中提供至少一种苯酚,所述苯酚从以下组合中选择:苯酚、单烷基苯酚、双烷基苯酚和三烷基苯酚,其摩尔配比为至少0.5摩尔部分相对于一摩尔的3,3'-四-t-丁基-4,4'-联苯酚,作为加入溶剂;其中,单烷基苯酚、双烷基苯酚和三烷基苯酚中烷基基团的碳原子数各自独立在1到4范围内;而后续步骤中加入反应槽的溶剂的平均烷基基团数小于前述步骤中加入反应槽的溶剂的平均烷基基团数。