METHODS AND SYSTEMS FOR EFFICIENT NEUTRALIZATION OF ACID GASES

摘要

Methods and apparatuses are disclosed for the continuous treatment of gas streams contaminated with one or more acid gases, for example HCI, H2S, SO2, SO3, and/or Cl2. At least primary and secondary neutralization zones are utilized, with the secondary neutralization zone being fed by a portion of the gas stream that is used to carry out essentially complete neutralization of a neutralization solution, such as aqueous sodium hydroxide, prior to its disposal (e.g., via biological treatment). The flow of this portion of the gas stream may be regulated by periodically or continuously monitoring the concentration or pH of the spent neutralization solution exiting the secondary neutralization zone. Suitable gas streams that can be treated include effluent gases comprising hydrogen chloride from hydrocarbon conversion processes, particularly paraffin isomerization processes, utilizing a chloriding agent as a catalyst promoter.