PROCESS AND APPARATUS FOR TREATING SPENT CAUSTIC SOLUTION

摘要

The present invention relates to a process for treating a spent caustic solution which has been used to treat hydrocarbon streams and to an apparatus for treating a spent caustic solution. In particular, the invention relates to the treatment of a spent caustic solution which provides an environmentally acceptable solution for discharge into a conventional wastewater treatment plant or for further processing. A spent caustic solution enters a reactor (3) by transfer pump (1) and is cycled through the reactor (3) and into the process fluid line (10). In a venturi gas / liquid contactor (5) it is contacted with a gas comprising ozone and with carbon dioxide to form a treated solution of pH 7.0 to 11.0.