Unit and process for treating refinery process wastewater

• Main Author: BASSET, ALEXANDRE
• Format: Patent
• Language: English; French; German
• Published: 30.04.2008
• Subjects: AMMONIA; CHEMISTRY; COMPOUNDS THEREOF; CYANOGEN; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The unit for separating the pollutants such as ammonia and hydrogen sulfide contained in the water of refining process, comprises an unit (11) for extracting liquid or gas pollutants, a conduit (13) for passing the water at top of the extraction unit, a conduit (14) for passing gas extracted in bottom of the extraction unit, a conduit (15) for withdrawing the effluent collected in an exit of the extraction unit, a conduit for evacuation of gas generated in top of the extraction unit, and a condensation balloon adapted to recover condensate formed by the gas and non-condensed residual gas. The unit for separating the pollutants such as ammonia and hydrogen sulfide contained in the water of refining process, comprises an unit (11) for extracting liquid or gas pollutants, a conduit (13) for passing the water at top of the extraction unit, a conduit (14) for passing gas extracted in bottom of the extraction unit, a conduit (15) for withdrawing the effluent collected in an exit of the extraction unit, a conduit for evacuation of gas generated in top of the extraction unit, a condensation balloon adapted to recover condensate formed by the gas and non-condensed residual gas, and a cooling tower for cooling the gas. The cooling tower is placed between the extraction unit and condensation balloon. The extraction unit is a stripping column. The cooling tower and condensation balloon are designed in a manner to obtain a condensate flow of 0.1 times the flow of the water reactants. A cleaning device is arranged to avoid the formation of ammonium sulfide at top of the cooling tower. Temperature difference (greater than 50[deg] C) between top of the extraction unit and condensation balloon is determined according to a ratio of hydrogen sulfide to ammonia to condensate 99.9 wt.% of gas generated at top of the extraction unit. An independent claim is included for a unit for treating the water of refining process. L'invention concerne une unité de traitement d'eaux de procédés de raffinage pour la séparation et l'élimination de polluants contenus dans ces eaux, et l'utilisation de ladite unité de traitement. L'unité de traitement selon l'invention comprend au moins une unité de séparation et de concentration et un dispositif de traitement et de séparation situé en aval. L'unité de séparation et de concentration permet de réduire les débits à traiter, ce qui permet de réduire le volume du dispositif de traitement et de séparation situé en aval, et par conséquent les coûts d'investissement, sans modification majeure des installations existantes.