A method and device for treating and reusing sewage at the top of a distillation unit

Abstract

The invention relates to the field of refinery waste water treatment, in particular to a method and a device for treating and recycling sewage at the tower top of a distillation apparatus. According to the method, the sewage at the top of a distillation tower is filtered by macroporous strong-base mixed type anion exchange resin after being filtered by a filtering medium, the filter medium is one of or a mixture of zeolite and activated carbon or an ion exchange membrane, and the water obtained after filtering is reinjected. The device for carrying out the method comprises the distillation tower, a zeolite filter, a macroporous strong-base mixed type anion exchanger and a water injection device which are sequentially connected, wherein the water injection device is connected with the distillation tower. With the adoption of the method and the device for treating and recycling the sewage at the tower top of the distillation apparatus, impurities in the sewage at the top of the distillation tower can be effectively reduced through two-stage adsorption and impurity removal, the water obtained after filtering reaches a reinjection index, the load and corrosion of a sewage steam stripping device are reduced, the operation is simple in the whole process, the method and the device are economical and applicable, the filtering medium is renewable, the service life is long, the energy consumption is reduced and the method and the device are energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the field of oil refinery wastewater treatment, in particular to a method and device for treating and reusing sewage at the top of a distillation unit. Background technique [0002] The loss and waste of resources is the source of the environment being polluted by industry, and the unsustainable development and utilization of resources is a serious constraint factor for the development of industry (as well as the entire national economy). The oil refining industry involves several important natural resources, such as water resources, oil and gas resources, and sulfur resources. Therefore, while developing production, we must pay attention to the rational use, conservation and protection of resources, and give top priority to resource development and conservation. The guidelines, and strive to explore the optimization of resource utilization, re-resources. [0003] Since the 1990s, with the continuous improvement of the quality...

AI Technical Summary

Problems solved by technology

That is to say, the sewage at the top of the distillation unit is also mixed with other sewage for centralized treatment, but this kind of sewage from oil refineries is difficult to treat, and this kind of sewage has the characteristics of high concentration and variety, and because of the sewage in my country's refineries Heavy oil and sour crude oil account for a large proportion

Sewage contains a lot of colloids, asphaltene, solid paraffin, petroleum naphthenic acid soap and trace solid particles, etc., which results in good emulsification stability, but causes a large load on the subsequent sewage stripping device, giving Reuse processing brings great difficulty

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