There is provided a method for producing hydroxypivalaldehyde (HPA), including steps (i) to (iii) below in this order,
Step (i): a reaction step of reacting IBAL with FA to produce a reaction solution containing HPA,
step (ii): an extraction step of extracting the reaction solution with an aldehyde solvent represented by formula (1) under basicity to obtain an extract containing HPA, and
step (iii): a distillation and collection step of distilling the extract and then collecting HPA from the residue,
wherein R represents a saturated alkyl group having 3 or more and 7 or less carbon atoms,
further wherein the distillation step of the step (iii) is a step of distilling an extract in the presence of water, and an amount of the water which is subjected to the distillation is 100 parts by mass or more and 2,000 parts by mass or less, with respect to a total amount, 100 parts by mass, of isobutyraldehyde (IBAL) derived from a raw material and an aldehyde solvent represented by formula (1) in an extract which is subjected to the distillation.
The method enables HPA to be mass-produced and the collecting ratio of HPA to be improved while selectively removing impurities other than water contained in HPA, specifically IBAL and the like. According to the method for producing HPA as mentioned above, it is possible to reduce the content of neopentyl glycol-isobutyrate, isobutylaldehyde-hydroxypivalaldehyde-acetal, and isobutylaldehyde-hydroxypivalaldehyde-aldol as specific impurities byproduced from HPA.
本发明提供了一种制备羟基皮酮醛(HPA)的方法,包括以下步骤(i)至(iii),顺序如下:步骤(i):将
IBAL与FA反应,生成含有HPA的反应溶液;步骤(ii):用式(1)表示的醛溶剂在碱性条件下提取反应溶液,得到含有HPA的
提取物;步骤(iii):蒸馏
提取物,然后从残渣中收集HPA。其中,R表示具有3个或更多7个或更少碳原子的饱和烷基。此外,步骤(iii)的蒸馏步骤是在
水的存在下蒸馏
提取物,并且所蒸馏的
水的量是相对于原料中产生的100份质量的
异丁醛(
IBAL)和式(1)表示的醛溶剂的总量的100份质量至2000份质量之间。该方法能够大规模生产HPA,并在选择性地除去除
水以外的杂质(如
IBAL等)的同时提高收集HPA的比率。根据上述制备HPA的方法,可以减少从HPA产生的
新戊二醇异丁酸酯、
异丁醛-羟基皮酮醛缩合物和
异丁醛-羟基皮酮醛醛缩合物等特定杂质的含量。