Ethyl Corporation

Olan W Mitchell

Bonnie G McKinnie

Kryn G Ihrman

R Woodrow Wilson, Jr

Production of alkyl substituted aromatic diamines by reacting triethlyaluminum with an aromatic diamine and a chloride ion source in the presence of an olefin is disclosed. The alkyl substituted aromatic diamines are useful as chain extenders in polyurethane processes.

Process for alkylation of aromatic diamines

Production of alkyl substituted aromatic diamines by reacting triethylaluminum with an aromatic diamine and a chloride ion source in the presence of an olefin is disclosed. The alkyl substituted aromatic diamines are useful as chain extenders in polyurethane processes.

Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to the use of liquid bromine feed to a methanol-bisphenol-A solution. The process is readily adapted to large scale equipment by circulating the reaction mixture from the reaction vessel through an external closed loop which includes an impingement mixer. The bromine-methanol feed is pumped at the proper rate and ratio into the impingement mixture whereby it impinges with the circulating reaction mixture. The resultant bromination mixture is then returned to the reaction vessel.

Tetrabromobisphenol-A process

Tetrabromobisphenol-A is made in high purity by contacting a solution of bisphenol-A dissolved in a C.sub.1 -C.sub.4 alkanol with gaseous bromine.

Process for preparing tetrabromobisphenol-A

Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to use of liquid bromine feed.

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Glen Carbon, IL, United States of America

Olan W Mitchell