초록 ▼

A method for producing plasticizers which contain titanium in only a very small amount is provided. According to this method, the amount of waste water is very small. This method comprises reacting phthalic anhydride with an alcohol having 4-18 carbon atoms in the presence of, as a catalyst, a tetra

A method for producing plasticizers which contain titanium in only a very small amount is provided. According to this method, the amount of waste water is very small. This method comprises reacting phthalic anhydride with an alcohol having 4-18 carbon atoms in the presence of, as a catalyst, a tetraalkyl titanate or a polymer thereof, and has a feature in the treatment of the resultant ester with a solid alkali and adsorbing agent(s) in the absence of water.

대표청구항 ▼

In a method for producing dialkyl phthalate plasticizer by esterification in the presence of a tetraalkyl titanate, followed by treatment of the resulting ester with adsorbent(s) and filtration, the improvement which comprises: (1) reacting phthalic anhydride with an alkanol having 4-18 carbon atoms

In a method for producing dialkyl phthalate plasticizer by esterification in the presence of a tetraalkyl titanate, followed by treatment of the resulting ester with adsorbent(s) and filtration, the improvement which comprises: (1) reacting phthalic anhydride with an alkanol having 4-18 carbon atoms at a temperature of 150°C.-250°C., for 3-6 hours, in the presence of a tetraalkyl titanate or its polymer to obtain a dialkyl phthalate having an acid value of 0.1 or lower and distilling off the remaining unreacted alkanol from the resulting phthalate at a high temperature and under a reduced pressure; (2) subjecting the dialkyl phthalate obtained from the step (1), without the conventional treatment of blowing steam into said dialkyl phthalate after said distilling off, to a contact treatment with a solid alkali selected from the group consisting of sodium carbonate, sodium bicarbonate, calcium carbonate, barium carbonate, sodium hydroxide and potassium hydroxide, in the absence of water, at a temperature of 100°C. to 200°C.; (3) treating the resulting liquid obtained in said contact treatment, with adsorbent(s); and (4) separating the dialkyl phthalate from the resulting material by filtration.