The invention is a base-modified clay that selectively catalyzes the formation of a glycol monoester from an aldehyde. The base-modified clay comprises a clay having secluded conjugate base sites and exchangeable interstitial cationic spaces. In the base-modified clay, the interstitial hydroxyl groups have been converted to oxide sites, at least one structural hydroxyl group has been converted to an oxide site. The base-modified clay contains sufficient conjugate base cations to balance the charge of said oxide groups. Processes for preparing the base-modified clay are described. The invention also provides a process for preparing a glycol monoester. This process includes heating in a reaction vessel an aldehyde and a catalytic amount of the base-modified clay under conditions sufficient to produce a glycol monoester.
本发明是一种碱改性粘土,可选择性地催化醛形成
乙二醇单酯。碱改性粘土由具有僻静共轭碱基位点和可交换间隙阳离子空间的粘土组成。在碱改性粘土中,间隙羟基已转化为氧化位点,至少一个结构羟基已转化为氧化位点。碱改性粘土含有足够的共轭碱阳离子来平衡所述氧化物基团的电荷。本发明描述了制备碱改性粘土的工艺。本发明还提供了一种制备
乙二醇单酯的工艺。该工艺包括在足以生成
乙二醇单酯的条件下,在反应容器中加热醛和催化量的碱改性粘土。