Process for the preparation of high purity phthalonitriles

Phthalonitriles having a "TEG colour" of below 250 are made by distilling crude material in a system having at least 3 plates and with an overall reflux to feed ratio of at least 0.05 to 1. The crude phthalonitrile is preferably that obtained by ammoxidation of a xylene. Terephthalic acid...

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Bibliographische Detailangaben
Hauptverfasser:	WINNICK CHARLES N, SCHLOSSMAN IRWIN
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	Phthalonitriles having a "TEG colour" of below 250 are made by distilling crude material in a system having at least 3 plates and with an overall reflux to feed ratio of at least 0.05 to 1. The crude phthalonitrile is preferably that obtained by ammoxidation of a xylene. Terephthalic acid is prepared by alkaline or acidic hydrolysis of purified terephthalonitrile. Isophthalic acid is made similarly. Bis-(2-hydroxyethyl) terephthalate is prepared by reacting either purified terephthalonitrile or terephthalic acid obtained from the latter, with ethylene glycol in presence of alkali.