Technique for processing wastewater containing methanol and dimethyl ether

A technology of dimethyl ether and methanol, which is applied in the field of sewage treatment process containing methanol and dimethyl ether, can solve the problems of incapable of sewage treatment and no sewage treatment device is found, and achieves low operating pressure, saving of utility costs, and flexible operation. Effect

Active Publication Date: 2008-03-12
LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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Problems solved by technology

However, this technology cannot treat sewage containing substances such as methanol and dim...

Method used

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  • Technique for processing wastewater containing methanol and dimethyl ether
  • Technique for processing wastewater containing methanol and dimethyl ether

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Embodiment Construction

[0021] As shown in Figure 1, the sewage containing methanol and dimethyl ether is pressurized by sewage pump 1, and then enters dimethyl ether after heat exchange with methanol-containing water from the bottom of dimethyl ether stripping tower 3 through heat exchanger 2 Stripping tower 3, dimethyl ether stripping tower 3 overhead produces gaseous mixtures such as dimethyl ether, enters reflux tank 6 after being cooled by cooler 5, and the liquid phase flow in reflux tank 6, after reflux pump 7 boosts, Return to the top of the dimethyl ether stripping tower 3 as reflux, and the dimethyl ether vapor phase stream in the reflux tank 6 is condensed into a liquid phase as a dimethyl ether product through a condenser 8, and the dimethyl ether product can be used as methanol to produce low-carbon The raw materials of olefins are returned to the reaction part of the MTO unit, and can also be sent out of the unit for other purposes. Methanol-containing water is discharged from the 3 bot...

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Abstract

The present invention discloses a wastewater treatment technics containing methanol and dimethyl ether and solves the problem that the wastewater produced by MTO device can not meet the need of the water inlet quality of wastewater treatment plant. The technics of the present invention includes that the wastewater containing methanol and dimethyl ether enters a dimethyl ether stripping tower after heat exchange. The top of the tower generates gas mixtures of dimethyl ether, etc. The bottom of the tower generates water containing methanol. The water containing methanol enters into a methanol stripping tower after heat exchange and pressuring. The top of the methanol stripping tower generates methanol gas which enters a methanol reflux drum after being cooled. After lifting pressure, part of the methanol gas return to the top of the methanol stripping tower as reflux and the other part as the products of methanol. The bottom of the methanol stripping tower generates purified water. The total content of methanol and dimethyl ether in the purified water acquired after treated by the technics of the present invention is less than or equal to 100ppm and the purified water can meet the need of the water inlet quality of wastewater treatment plant.

Description

technical field [0001] The invention belongs to the field of sewage treatment. It particularly relates to a sewage treatment process containing methanol and dimethyl ether. Background technique [0002] Petroleum refining, petrochemical and other industrial processes often produce sewage. If it is not treated in time, it will seriously pollute the environment and cause the loss of effectively used resources. The technology of producing olefins from coal or natural gas through methanol (MTO) is at the forefront of technology development in the world, and has obvious competitive potential. Under the current situation of high oil prices, the production of low-carbon olefins from coal or natural gas through methanol is about to enter the stage of industrial application in the world. Since the sewage produced by methanol to low-carbon olefins unit (hereinafter referred to as MTO unit) contains a small amount of methanol toxic substances and dimethyl ether and other harmful subs...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/58C02F101/34
Inventor 熊献金
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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