Process and apparatus for treating spent caustic solution
AssigneeLinde Aktiengesellschaft
InventorsDarren GURNEY, Gusberti AMBROGIO
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Abstract
A process for treating a spent caustic solution and an apparatus for treating a spent caustic solution. The treatment provides an environmentally acceptable solution for discharge into a conventional wastewater treatment plant or for further processing. A spent caustic solution enters a reactor and is cycled through the reactor and into a process liquid line where it is contacted with ozone and with carbon dioxide to form a treated solution of pH 7.0 to 11.0.
Claims58
A process for treating spent caustic solution, the process comprising:
- contacting a spent caustic solution with
- (i) a gas comprising ozone;
- and
- (ii) carbon dioxide;
- to form a treated solution having a pH of 7.0 to 11.0;
- and
- discharging at least a portion of the treated solution.
An apparatus for treating a spent caustic solution, the apparatus comprising:
- a first reactor;
- wherein the first reactor has an inlet for introducing a solution and an outlet for removing solution;
- and
- the first reactor comprises a means for introducing a gas comprising ozone into the reactor and a means for introducing carbon dioxide into the reactor.
An apparatus for treating a spent caustic solution, the apparatus comprising:
- a first reactor, and
- a second reactor,
- wherein each of the first reactor and the second reactor has an inlet for introducing solution and an outlet for removing solution;
- and
- wherein the first reactor and the second reactor are in fluid communication with one another, such that, in use, solution can be transferred from the first reactor to the second reactor;
- the first reactor comprising a means for introducing a gas comprising ozone into the reactor, and
- the second reactor comprising a means for introducing carbon dioxide into the reactor.
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Dependencies are inferred from the claim text.