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Method for recovering organic matters in wastewater generated in process for preparing olefin from methanol

A methanol-to-olefins and wastewater recovery technology, applied in chemical instruments and methods, natural water treatment, water/sewage treatment, etc., can solve the problems of low recovery efficiency and high energy consumption, and achieve the reduction of recycled resources, simple operation, and compact equipment Effect

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of low recovery efficiency and high energy consumption in the prior art when recovering organic matter from MTO reaction wastewater, the present invention combines pervaporation membrane technology with stripping technology to provide a simple and economical recovery of MTO reaction wastewater The method of medium organic matter, and achieved the purpose of pretreatment of high-concentration organic wastewater

Method used

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  • Method for recovering organic matters in wastewater generated in process for preparing olefin from methanol
  • Method for recovering organic matters in wastewater generated in process for preparing olefin from methanol
  • Method for recovering organic matters in wastewater generated in process for preparing olefin from methanol

Examples

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Effect test

Embodiment 1

[0031] A kind of MTO process waste water, the main component of waste water: 95wt% water, methanol (35000mg L -1 ), acetone (1050mg·L -1 ), ethanol (345mg·L -1 ), acetaldehyde (224mg·L -1 ), 2-butanone (332mg·L -1 ), the pH value is 6.61, the conductivity is 150μS / cm, and the COD is 25000mg·L -1 . Processing flow such as figure 1 shown.

[0032] In the figure, 1. Feed liquid tank, 2. Feed pump, 3. Heat exchanger, 4. Pervaporation membrane module that preferentially permeates organic matter, 5 / 9. Condenser, 6 / 11. Vacuum pump, 7. Stripper , 8. Pervaporation membrane modules with preferential water permeability, 10. Product tank.

[0033] Send the MTO process wastewater through 2 into 3 to preheat to 40°C; the preheated MTO wastewater into 4, the feed pressure is 0.01MPa, the membrane surface flow rate is 0.01m / s, and the membrane material is cross-linked PDMS / PVDF membrane. Vacuum the permeate side of the membrane module, control the pressure on the permeate side at 5KPa...

Embodiment 2

[0035] A kind of MTO process reaction waste water, the main component of waste water: 95wt% water, methanol (41130mg L -1 ), acetone (2520mg·L -1 ), ethanol (200mg·L -1 ), acetaldehyde (20mg·L -1 ), 2-butanone (20mg·L -1 ) pH value is 5.60, conductivity is 241μS / cm, COD is 36980mg L -1 . Processing flow such as figure 1 shown.

[0036] Send the MTO process wastewater through 2 into 3 to preheat to 50°C; the preheated MTO wastewater into 4, the feed pressure is 0.02MPa, the membrane surface flow rate is 0.5m / s, and the membrane material is cross-linked PDMS / PVDF membrane. Vacuum the permeate side of the membrane module, control the permeate side pressure at 2KPa, and the membrane flux is 1250g m -2 h -1 The permeate is cooled by 5, the temperature of the condenser is controlled at -20°C, and then separated by the gas-liquid separator. The total organic content of the collected permeate is 30wt%, and the organic content in the water from which the organic matter has been...

Embodiment 3

[0038] A kind of MTO process reaction waste water, the main component of waste water: 95wt% water, methanol (40500mg L -1 ), acetone (1175mg·L -1 ), ethanol (493mg·L -1 ), acetaldehyde (20mg·L -1 ), 2-butanone (488mg·L -1 ) pH value is 5.44, conductivity is 199μS / cm, COD is 66350mg L -1 . Processing flow such as figure 1 shown.

[0039] The MTO process wastewater is sent into 3 through 2 to preheat to 70°C; the preheated MTO wastewater enters 4, the feed pressure is 0.05MPa, the membrane surface flow rate is 0.01m / s, and the membrane material is cross-linked PDMS / PVDF membrane. Vacuum the permeate side of the membrane module, control the pressure on the permeate side at 1KPa, and the membrane flux is 2400g m -2 h -1 ;

[0040] The permeate is cooled by 5, the temperature of the condenser is controlled at -10°C, and it is separated by a gas-liquid separator. The total organic content of the collected permeate is 21wt%, and the organic content of the water from which th...

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Abstract

The invention provides a method for recovering organic matters in wastewater generated in a process for preparing olefin from methanol. In the method, a pervaporation membrane or a vapor permeation membrane preferably permeating organic matters is adopted to separate the organic matters and water in the wastewater, methanol-containing organic matters are subjected to steam stripping, the steam stripping product is dehydrated by a pervaporation membrane or a vapor permeation membrane preferably permeating water so as to obtain the methanol and derivative products, and the wastewater from which the organic matters are removed can be directly discharged into a sewage farm or further treated to be reused in the production process. In the treatment method, the methanol and the derivative products in the wastewater are recovered, and the aim of treating the sewage is fulfilled.

Description

technical field [0001] The invention relates to a method for recovering organic matter in wastewater, in particular to a method for recovering organic matter in methanol-to-olefin process wastewater by using a pervaporation membrane / steam permeation membrane. Background technique [0002] At present, methanol to olefin (Methanol To Olefin, hereinafter referred to as MTO) technology is at the forefront of development in the world. Methanol is converted into olefins mainly ethylene and propylene through reaction. The ratio of ethylene and propylene produced by different processes is different, which is representative. Prominent MTO technologies include: UOP / Hydro, Mobil, and Dalian Institute of Chemical Physics, Sinopec Shanghai Research Institute of Chemical Technology, etc. In recent years, the technology of methanol to olefins has developed rapidly, but there are few engineering examples of process wastewater treatment for methanol to olefins. At present, the by-product wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/58C02F1/04C02F103/36
Inventor 王玉杰杨永强张新妙李井峰
Owner CHINA PETROLEUM & CHEM CORP
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