A methanol-to-olefin wastewater treatment device and its start-up method

Abstract

The invention relates to a methanol-to-olefin wastewater treatment device and a starting method thereof, comprising: a grease trap, a coagulation sedimentation tank, a homogeneous tank, a homogeneous tank outlet pump, an air flotation tank, an anaerobic circulation tank, an anaerobic circulation pump, Anaerobic reactor, anaerobic water outlet tank, anaerobic water outlet pump, oxygenator, aerobic circulation pump and aerobic reactor; the starting method of the device includes the following steps: the first step, sequentially start the grease trap, coagulation Sedimentation tank, homogeneous tank, homogeneous tank outlet pump, air flotation tank, anaerobic circulation tank, anaerobic outlet tank, anaerobic outlet pump; the second step is to start the anaerobic circulation pump, anaerobic reactor, and oxygenator in sequence ; The third step is to sequentially start the oxygenator, the aerobic circulation pump and the aerobic reactor. The methanol-to-olefin wastewater treatment device and its start-up method of the present invention realize the comprehensive and effective treatment of MTO wastewater, have the advantages of less inoculated sludge, short start-up time, high treatment efficiency, and good effluent quality, and are easy to realize industrial application .

Description

technical field [0001] The invention relates to the technical field of MTO (methanol to olefin), in particular to a methanol to olefin wastewater treatment device and a starting method thereof. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials and play a very important role in modern petroleum and chemical industries. Traditionally, the source of ethylene and propylene is mainly hydrocarbon steam cracking, and the feedstock is mainly naphtha. In recent years, the oxygenate-to-olefins (OTO) process has become increasingly mature, especially the MTO process has begun to be applied on a large scale. [0003] The chemical reaction equation and thermal effect of producing ethylene and propylene from methanol are: [0004] 2CH 3 OH→C 2 h 4 +2H 2 O (△H=11.72KJ / mol, 427℃) [0005] 3CH 3 OH→C 3 h 6 +3H 2 O (△H=30.98KJ / mol, 427°C) [0006] It can be seen from the above reaction equation that the met...

AI Technical Summary

Problems solved by technology

Like the Chinese patent CN102442744B, limited by the deficiencies of the existing technology, it is difficult for this patent to combine low-concentration MTO wastewater into consideration

[0019] It is not difficult to see from the above description that the prior art treats high-concentration MTO wastewater and low-concentration MTO wastewater separately. This is because it is technically feasible or economically rational to combine MTO wastewater with existing technology. Existence constraints

Images