PREFACEThere was a close connection between the bromine industrial and salt industry(NaCl).The raw material of making bromine were seawater and salt brine(concentrated seawater).The existing form of bromine was mainly bromine ion in the marine or in the salt brine derived from paleo- seawater. The raw material of making bromine was salt brine before or after salting out. The concentrations of salt brine were different due to different resources in the word. Minority countries such as Japan extracted bromine takes seawater as raw material, such countries as China and India take brine of medium concentration in salt making or brine of high concentration after salting out as raw material, such countries as America and Israel take brine in paleo-ocean as raw material.
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