Method of making plasticizers
First Claim
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1. Method of making an ester of a polycarboxylic acid whereby no appreciable amount of waste water is created, comprising (a) reacting said polycarboxylic acid or anhydride with an alkanol having 4-18 carbon atoms at a temperature of 180°
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C. in the presence of an organic titanium-containing catalyst to obtain a plasticizer product having an acid number of no more than 0.1, (b) adding to said plasticizer product an aqueous alkaline solution at a temperature of about 80°
-150°
C., (c) passing said plasticizer product through an absorbent medium, thereby producing a permeate including said plasticizer product and alkanol and having reduced titanium and sodium contents, (d) stripping alkanol from said permeate, and (e) recovering said plasticizer product therefrom.
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Abstract
A process for the titanate catalyzed preparation of plasticizers from polycarboxylic acids and alcohols which minimizes waste water and is energy efficient. The reaction product is treated with aqueous caustic and is then filtered using an absorbent medium which removes titanium, caustic, acid salts and water. The need for water washing is obviated, and the final plasticizer product has excellent properties.
18 Citations
14 Claims
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1. Method of making an ester of a polycarboxylic acid whereby no appreciable amount of waste water is created, comprising (a) reacting said polycarboxylic acid or anhydride with an alkanol having 4-18 carbon atoms at a temperature of 180°
- -250°
C. in the presence of an organic titanium-containing catalyst to obtain a plasticizer product having an acid number of no more than 0.1, (b) adding to said plasticizer product an aqueous alkaline solution at a temperature of about 80°
-150°
C., (c) passing said plasticizer product through an absorbent medium, thereby producing a permeate including said plasticizer product and alkanol and having reduced titanium and sodium contents, (d) stripping alkanol from said permeate, and (e) recovering said plasticizer product therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14)
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13. Method of making an ester of a polycarboxylic acid comprising (a) reacting said polycarboxylic acid or anhydride with an alkanol having 4-18 carbon atoms at a temperature of 180°
- -250°
C. in the presence of an organic titanium-containing catalyst to obtain a plasticizer product having an acid number of no more than 0.1, (b) adding to said plasticizer product an aqueous alkaline solution at a temperature of about 80°
-150°
C., (c) passing said plasticizer product through an absorbent medium selected from the group consisting of fuller'"'"'s earth, hydrotalcite, and magnesium silicate, thereby producing a permeate including said plasticizer product and alkanol and having reduced titanium, sodium and water contents, (d) stripping alkanol from said permeate, and (e) recovering said plasticizer product therefrom.
- -250°
Specification