Treatment method of organic wastewater of coal liquefaction

Abstract

The invention provides a treatment method of organic wastewater of coal liquefaction. The treatment method comprises the following steps of performing steam stripping on the organic wastewater: feeding pre-heated hydrocarbon gas and raw water containing the organic wastewater of coal liquefaction into a stripping tower respectively from the lower part and upper part of the stripping tower; steam-stripping the organic wastewater by using the hydrocarbon gas in the stripping tower; discharging the organic wastewater after the steam stripping from the bottom of the tower; and discharging the hydrocarbon gas from the top of the tower. The treatment method of the organic wastewater of coal liquefaction, disclosed by the invention, has the advantages of short process, simple equipment, and capabilities of efficiently solving the problem that the organic water in the coal liquefaction process is difficult to treat and utilize and realizing the resource utilization of the organic wastewater.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of petrochemical industry, and in particular relates to a treatment method for coal-to-oil organic wastewater. Background technique [0002] For a long time, my country has been a country with "more coal and less oil and gas". Due to the increasing demand for oil, the use of related technologies to convert coal into refined oil is an important way to solve the lack of oil resources in our country. [0003] Coal-to-liquids (CTL) is a technology that uses coal as raw material to produce oil products and petrochemical products through chemical processing, including two technical routes of coal direct liquefaction and coal indirect liquefaction. The direct liquefaction of coal is to directly liquefy coal into liquid hydrocarbon fuel through catalytic hydrogenation under high temperature and high pressure conditions, and further refine (remove sulfur, nitrogen, oxygen and other atoms) to become...

AI Technical Summary

Problems solved by technology

For the steam stripping method, although most of the organic matter in the organic wastewater can be stripped out, the stripped wastewater still needs to be sent to the sewage for treatment, and the stripped product also needs to be designed separately. The treatment required by the whole process is difficult, and the investment is high. High operating costs; however, for the steam stripping method that adds multiple-effect evaporation and concentration steps, it has the disadvantages of high energy consumption and the need for sewage treatment after evaporation

On the other hand, the current wastewater treatment process only focuses on the control of wastewater discharge, and the wastewater resources and organic components in wastewater have not been effectively utilized, and secondary discharge pollution is still inevitable.

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