Column gas-liquid contacting apparatus and its use thereof

A process for producing an ozone liquid, comprising

• introducing a liquid into an upper part of a column comprising at least two units comprising a packing material or a wetted wall structure, said units being separated by a gas back mixing preventer plate,
• introducing an ozone gas into a lower part of the column, and
• bringing the liquid into countercurrent contact with the ozone gas while keeping the gas phase as a continuous phase.

A process for oxidizing an organic substance in a liquid, comprising

• introducing a liquid to be treated into an upper part of a column comprising at least two units comprising a packing material or a wetted wall structure, said units being separated by a gas back mixing preventer plate,
• introducing an ozone gas into a lower part of the column, and
• bringing the liquid into countercurrent contact with the ozone gas while keeping the gas phase as a continuous phase.

A process for removing a gas dissolved in a liquid, comprising

• introducing a liquid to be treated into an upper part of a column comprising at least two units comprising a packing material or a wetted wall structure, said units being separated by a gas back mixing preventer plate,
• introducing a purge gas into a lower part of the column, and
• bringing the liquid into countercurrent contact with the purge gas while keeping the gas phase as a continuous phase to remove a gas dissolved in the liquid.

A process for removing a gas dissolved in a liquid, comprising

• introducing a liquid to be treated into an upper part of a column comprising at least two units comprising a packing material or a wetted wall structure, said units being separated by a gas back mixing preventer plate,
• introducing a purge gas into a lower part of the column, and
• bringing the liquid into countercurrent contact with the purge gas while keeping the gas phase as a continuous phase to remove a gas dissolved in the liquid and dissolve the purge gas in the liquid.

A process for treating a volatile substance in a liquid, comprising

• introducing a liquid to be treated into an upper part of a column comprising at least two units comprising a packing material or a wetted wall structure, said units being separated by a gas back mixing preventer plate,
• introducing a purge gas into a lower part of the column, and
• bringing the liquid into countercurrent contact with the purge gas while keeping the gas phase as a continuous phase to strip the volatile substance from the liquid.