Method for treating waste gas containing ethylene oxide and propylene oxide

A technology of ethylene oxide and propylene oxide, applied in the field of waste gas treatment, can solve the problems of large washing water consumption and difficult wastewater treatment

Inactive Publication Date: 2017-10-13
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is the problem of large washing water consumption and difficult treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A waste gas treatment method containing ethylene oxide and propylene oxide, the waste gas temperature is 120°C, and the mass flow rate is 817.5kg / h (including protective nitrogen gas N 2 =55.3wt%, EO=8.1wt%, PO=36.6wt%) wash by waste gas absorption tower (theoretical tray number 19), normal pressure operation, fresh water is cooled to 10 ℃ through lithium bromide freezer as washing water ( 5.2t / h) from the top of the tower. After washing, the EO content in the gas phase is 3PPB and the PO content is 3PPM respectively. Bottom washing rich liquid 5569kg / h (including EO content 66kg / h) enters the hydration reactor for reaction after passing through the waste water pump. %. After conversion, the waste liquid is discharged into the sewage treatment system for treatment. The hydration reactor is a suspended bed catalytic reactor with an inner diameter of 800mm, an effective catalyst loading height of 2500mm, and a catalyst loading volume of 1.26m 3 . Catalyst adopts ion ...

Embodiment 2

[0025] A waste gas treatment method containing ethylene oxide and propylene oxide, the waste gas temperature is 120°C, and the mass flow rate is 817.5kg / h (including protective nitrogen gas N 2=55.3wt%, EO=8.1wt%, PO=36.6wt%) wash by waste gas absorption tower (theoretical plate number 19), normal pressure operation, fresh water is cooled to 40 ℃ through lithium bromide freezer as washing water ( 5.2t / h) from the top of the tower. The operating pressure of the tower is 0.1 MPa, and the contents of EO and PO in the gas phase after washing are respectively 0.038wt% and 0.216wt%. Bottom washing rich liquid 5378kg / h (including EO content 42kg / h) enters the hydration reactor for reaction after passing through the waste water pump. The reaction temperature is 43.65°C and the reaction pressure is 0.1MPa. After the reaction, the conversion rate of ethylene oxide / propylene oxide is 99.999% %. After conversion, the waste liquid is discharged into the sewage treatment system for treatm...

Embodiment 3

[0027] A waste gas treatment method containing ethylene oxide and propylene oxide, the waste gas temperature is 120°C, and the mass flow rate is 817.5kg / h (including protective nitrogen gas N 2 =55.3wt%, EO=8.1wt%, PO=36.6wt%) wash by waste gas absorption tower (theoretical plate number 19), normal pressure operation, fresh water is cooled to 70 ℃ through lithium bromide freezer as washing water ( 5.2t / h) from the top of the tower. The operating pressure of the tower is 0.1 MPa, and the contents of EO and PO in the gas phase after washing are respectively 0.04wt% and 0.202wt%. Bottom washing rich liquid 5338.098kg / h (including EO content 39.135kg / h) enters the hydration reactor for reaction after passing through the waste water pump. is 99.999%. After conversion, the waste liquid is discharged into the sewage treatment system for treatment. The hydration reactor is a suspended bed catalytic reactor with an inner diameter of 700mm, an effective catalyst filling height of 200...

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PUM

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Abstract

The present invention relates to a method for treating waste gas containing ethylene oxide and propylene oxide. A purpose of the present invention is to mainly solve the problems of high washing water consumption and difficult wastewater treatment after the washing in the prior art. According to the present invention, with the method, waste gas containing ethylene oxide and propylene oxide enters a waste gas absorption tower, and contacts washing water so as to be washed, the washed waste gas achieving the environmental protection discharge standard is discharged into atmosphere from the top portion of the waste gas absorption tower, the washing rich liquid on the bottom portion of the waste gas absorption tower enters a hydration reactor through a wastewater pump, and is subjected to a catalytic hydration reaction, the conversion rates of ethylene oxide and propylene oxide in the hydration reactor are higher than 95%, and the wastewater being subjected to the catalysis reaction enters a wastewater treatment system. With the technical scheme, the problems in the prior art are well solved. The method of the present invention can be used for the treatment of waste gas containing ethylene oxide and propylene oxide.

Description

technical field [0001] The invention relates to a waste gas treatment method containing ethylene oxide and propylene oxide. Background technique [0002] With the rapid development of the country's social economy, the country's requirements for environmental protection have further increased. With the promulgation of various environmental protection laws and regulations, "people-oriented, green and environmental protection" is the only way for contemporary enterprises and social development. [0003] How to treat tail gas economically and rationally is an important direction of environmental protection, which is in line with my country's energy structure and development strategy. The invention relates to a treatment method for waste gas containing ethylene oxide (EO) / propylene oxide (PO), which mainly solves the problems of insufficient washing of ethylene oxide / propylene oxide (PO), large washing consumption, and Difficult treatment of ethylene oxide / propylene oxide washi...

Claims

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Application Information

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IPC IPC(8): B01D53/18C02F1/00C02F101/34C02F103/18
CPCB01D53/18B01D53/14B01D2252/103B01D2257/70C02F1/00C02F2101/34C02F2103/18C02F2305/04
Inventor 张艺贾微张翼陈迎徐曼刘肖肖
Owner SINOPEC SHANGHAI ENG
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