Sabic Innovative Plastics IP B.v.

Pushpa Narayanan

Gurram Kishan

Mahesh Malusare

Jan Plen Lens

Pradeep Jeevaji Nadkarni

Tong Sun

Balakrishnan Ganesan

Venkata Rama Narayanan Ganapathy Bhotla

Ravindra Vikram Singh

Swaminathan Shubashree

Guohua Xiu

Rajshekhar Basale

Arun Dixit

Hyacinth Mary Bastian

Ramanarayanan Gv

Disclosed herein is a method comprising reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 99 weight percent phenolphthalein, based on the total weight of the phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is purified by a combination of techniques to produce a solid comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine with sufficient purity to be used as a monomer in the synthesis of clear polymers.

Methods for producing and purifying 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine monomers and polycarbonates derived therefrom

A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A, contacting the solution A with an adsorbent material selected from the group consisting of metal oxides, modified metal oxides, activated carbons, and clays, filtering the adsorbent material to form a solution B, adding an anti-solvent to the solution B to form a solution C, and distilling the solution C, wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value of 1 to 4.

Process for the purification of dihydric phenols

A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an anti-solvent to the solution B to form a solution C; and distilling the solution C; wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value 1 to 4.

Method of purification of dihydric phenols

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Karnataka, India

Pushpa Narayanan