초록 ▼

Tetrabromobisphenol-A is made in high purity and increased yield by adding a methanol-bromine solution to a methanol bisphenol-A solution with vigorous agitation. The amount of methanol in the reaction vessel is adjusted to yield a ratio of tetrabromobisphenol-A to methanol when the reaction is subs

Tetrabromobisphenol-A is made in high purity and increased yield by adding a methanol-bromine solution to a methanol bisphenol-A solution with vigorous agitation. The amount of methanol in the reaction vessel is adjusted to yield a ratio of tetrabromobisphenol-A to methanol when the reaction is substantially complete that provides a lower amount of Hbr impurity in the tetrabromobisphenol-A product. An increased recovery of tetrabromobisphenol-A product is achieved by adjusting the water added to the reaction vessel when the bromination reaction is essentially complete.

대표청구항 ▼

A process for producing a tetrabromobisphenol-A predominant product in a high yield and high purity, said process comprising: (a) feeding a first stream comprising bromine dissolved in methanol to an impingement mixer; (b) impinging a second stream with said first stream in said impingement mixer to

A process for producing a tetrabromobisphenol-A predominant product in a high yield and high purity, said process comprising: (a) feeding a first stream comprising bromine dissolved in methanol to an impingement mixer; (b) impinging a second stream with said first stream in said impingement mixer to rapidly mix said streams and to form a reaction mixture thereof, said second stream, at process initiation, comprising bisphenol-A dissolved in methanol and, after at least one cycle of said process, comprising brominated bisphenol-A; (c) conducting said reaction mixture to a reaction vessel which holds reactor contents which, at process initiation, comprise bisphenol-A dissolved in methanol and, after at least one cycle of said process comprise brominated bisphenol-A; (d) removing a portion of said reactor contents from said reaction vessel to form said second stream; (e) continuing steps (a), (b), (c), and (d) until the amount of bromine fed is about 4 moles of bromine per mole of bisphenol-A used in said process and the weight ratio of TBBPA to methanol is about 0.67-0.68 when the bromination reaction is substantially complete; and (f) subsequent to (e), adding an amount of water to said reaction vessel which holds said reactor contents so as to obtain an increase in recovery of said product predominant in tetrabromobisphenol-A.