Method for recovering gasoline from mixed gas containing gasoline

Abstract

The invention discloses a method for recycling gasoline from gasoline-containing mixed gas and relates to a process for recycling gasoline from mixed gas of gasoline steam and air in a gas station or a gasoline storage and transportation tank region in an adsorption separation manner. The method is mainly used for solving the problems that the recycling rate of gasoline from the gasoline mixed gas is not high by utilizing an existing pressure swing adsorption method or membrane separation technique, and the content of the gasoline stream in the purified exhaust gas cannot reach the environment-friendly emission standard. By the method, the gasoline can be recycled with a high recycling rate and the exhaust gas can reach the environment-friendly emission standard. According to the method, adsorption recycling systems of at least three adsorption columns filled with adsorbents circularly run according to programs, and each circular operation of the adsorption columns comprises the steps of primary adsorption, secondary adsorption, steam flushing, sweeping and cooling; and steam obtained through processing of the adsorption columns is collected and is cooled to obtain gasoline and condensed water, and the gasoline and the condensed water are separated from each other to obtain gasoline. The process flow diagrammatic drawing of a recycling device is shown in attached drawings of an abstract of the specification.

Description

technical field [0001] The invention relates to a method for purifying and recovering specific components in a mixed gas, in particular to a method for recovering gasoline from a mixed gas containing gasoline vapor by an adsorption method. Background technique [0002] In the process of gasoline production, storage and transportation, and refueling at gas stations, gas containing gasoline vapor will be discharged. If it is not recovered and purified efficiently, it will not only cause environmental pollution, but also a great waste of resources. Great fire safety hazard. At present, the purification treatment methods of such gases usually adopt membrane separation method, solvent absorption method, condensation method and adsorption method. Due to the large changes in the concentration of gasoline-containing vapor emitted during gasoline production, storage and transportation, and refueling at gas stations, the oil vapor may reach the explosion limit during the pressurizati...

AI Technical Summary

Problems solved by technology

Due to the large changes in the concentration of gasoline-containing vapor emitted during gasoline production, storage and transportation, and refueling at gas stations, the oil vapor may reach the explosion limit during the pressurization process and cause safety hazards, which limits the use of membrane separation methods and solvents. The recovery and purification efficiency of the absorption method and the condensation method, so the adsorption method is mostly used to recover the gasoline vapor in the oil-gas mixed gas in the gas station and other oil gas recovery devices, but the existing adsorption recovery device adopts the 2-tower adsorption process, which cannot take into account the gasoline vapor The recovery benefit and the purification efficiency of gasoline vapor, resulting in the purified air still contains gasoline vapor, which cannot meet the environmental protection emission standards

At the same time, it also caused a reduction in the efficiency of exhaust gas recovery.

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