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Treatment method of 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: 2017-01-04
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 of waste water after washing in the prior art, and a new waste gas treatment method containing ethylene oxide and propylene oxide is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A waste gas treatment method containing ethylene oxide and propylene oxide, the temperature of the waste gas is 120°C, and the mass flow rate of the waste gas 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. The operating pressure of the tower is 0.1MPa. After washing, the EO content in the gas phase is 1PPB, and the PO content is 15PPB. The bottom washing rich liquid 6870kg / h (wherein the EO content is 66kg / h) passes through the waste water pump and the waste water preheater (preheated to 30°C), the secondary preheater (preheated to 35°C), enters the hydration reactor for reaction, the reaction temperature is 35°C, the reaction pressure is 0.1MPa, and the conversion rate of ethylene oxide / propylene oxide after the reaction is 99....

Embodiment 2

[0026] 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, waste water preheater (preheated to 45°C) and secondary preheater (preheated to 50°C) , the reaction temperature is 50° C., the reaction pressure is 0.1 MPa, and the conversion rate of ethylene oxide / propylene oxide after the reaction is 99.999%. After...

Embodiment 3

[0028] 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 after passing through the waste water pump, waste water preheater (preheated to 72°C), secondary preheater (preheated to 75°C) The reaction was carried out at a reaction temperature of 75° C. and a reaction pressure of 0.2 MPa. After the reaction, the conversion rate of ethylene oxide / propylene oxide w...

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Abstract

The invention relates to a treatment method of waste gas containing ethylene oxide and propylene oxide, mainly solving the problems in the prior art that the consumption of washing water is great and wastewater obtained by washing is difficult to treat. By adopting the treatment method of the waste gas containing ethylene oxide and propylene oxide, provided by the invention, the waste gas enters a waste gas absorption tower and is in contact with washing water to be washed; washed waste gas is discharged into the atmosphere from the top of the waste gas absorption tower; washing rich liquid at the bottom of the waste gas absorption tower passes through a waste water pump and then enters a wastewater pre-heater and a secondary pre-heater in sequence, and then enters a hydration reactor to be subjected to a catalytic hydration reaction; after ethylene oxide and propylene oxide in the hydration reactor are subjected to catalytic conversion reaction, the wastewater is conveyed into the wastewater pre-heater and is used as a heat source for pre-heating the washing rich liquid; and at least one part of the wastewater is treated by a lithium bromide freezer and then the treated wastewater is used as the washing water and enters the waste gas absorption tower. By adopting the technical scheme, the problems are solved very well; and the treatment method can be used for treating the 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): B01D53/14
CPCB01D53/1425B01D53/1487B01D2252/103
Inventor 张翼陈迎贾微张艺徐曼
Owner SINOPEC SHANGHAI ENG
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