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Method for purifying organic waste gas containing epoxypropane or ethylene oxide

A technology of ethylene oxide and propylene oxide, which is applied in the field of organic waste gas purification and treatment, can solve the problems of many impurities, the inability to effectively use solid acid catalyst for catalytic treatment for a long time, and the ineffective use of raw materials such as propylene oxide or ethylene oxide. , to achieve the effect of mild reaction conditions

Active Publication Date: 2014-09-03
WANHUA CHEM GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, it is difficult to ensure the "purity" of the inlet feed, resulting in a short service life of the solid acid catalyst, which cannot meet the needs of industrialization
[0011] In summary, the existing treatment methods for purifying waste gas containing high-concentration propylene oxide or ethylene oxide mainly have the following problems: the waste gas containing high-concentration propylene oxide or ethylene oxide, because there are many impurities in the waste gas, Unable to effectively use solid acid catalyst for catalytic treatment for a long time
The flow and concentration of exhaust gas fluctuate greatly, resulting in large fluctuations in the operation of the exhaust gas treatment system, which cannot operate stably
The three wastes produced in the waste gas treatment process cause secondary pollution to the environment, and the raw material propylene oxide or ethylene oxide cannot be effectively utilized

Method used

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  • Method for purifying organic waste gas containing epoxypropane or ethylene oxide
  • Method for purifying organic waste gas containing epoxypropane or ethylene oxide
  • Method for purifying organic waste gas containing epoxypropane or ethylene oxide

Examples

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Embodiment 1

[0053] The waste gas in this embodiment comes from: the process of generating polyether polyol by polymerization reaction of initiator propylene glycol, sorbitol, sugar, etc. and propylene oxide under the action of strong basic catalyst, the waste gas treatment process is as follows figure 1 As shown, the exhaust gas treatment steps are as follows:

[0054] (A) The exhaust gas enters the buffer tank through the fan for buffering, so that the maximum flow rate and the highest concentration part of the exhaust gas are homogenized, and the average gas volume is kept at 3000Nm 3 / day, PO concentration is about 30v%; other components in the waste gas include: organic amine 58ppm, ethanol 320ppm, low molecular weight polyether 810ppm, metal ions K, Fe, Na, and the rest is nitrogen. The specific content is shown in Table 2.

[0055] (B) The homogenized exhaust gas enters the solvent absorption tower filled with modified activated carbon fillers, the residence time of the exhaust gas...

Embodiment 2

[0069] The exhaust gas in this embodiment comes from the process of generating polyether polyols by the polymerization reaction of initiators such as ethylene glycol, sorbitol, sugar, etc., with ethylene oxide under the action of a strong basic catalyst, and the exhaust gas treatment steps are as follows:

[0070] (A) The organic waste gas is buffered by the buffer tank to homogenize the maximum flow rate and the highest concentration part of the waste gas, and keep the average gas volume at 3000Nm 3 / day, the EO concentration is about 35v%; other impurity components in the waste gas include: organic amine 83ppm, ethanol 240ppm, low molecular weight polyether 634ppm, metal ions K, Fe, Na, and the rest is nitrogen, the specific content is shown in Table 4;

[0071] (B) After homogenization, it enters the solvent absorption tower filled with modified activated carbon filler, the residence time of the waste gas in the tower is 10s, and the solvent circulation in the tower is 20Nm ...

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Abstract

The invention relates to a method for purifying organic waste gas containing epoxypropane or ethylene oxide. The method comprises the following steps: processing organic waste gas containing epoxypropane or ethylene oxide with concentration of 1v%-40v% sequentially by a solvent absorption tower filled with modified activated carbon filler, a solid acid catalysis unit, an organic acid catalysis unit and an active carbon fiber absorption tower after being homogenized through a buffer tank until the content of epoxypropane or ethylene oxide in the waste gas is less than 2ppm, converting most of epoxypropane or ethylene oxide into propylene glycol or ethylene glycol, and circulating to a polyether production system for recycling. According to the method, the problem that waste gas containing epoxypropane or ethylene oxide, with complicated flow and large concentration fluctuation, influences the stable operation of a waste gas processing device is solved, the outlet concentration of waste gas is continuously qualified, the waste gas emission standard is reached, and no three wastes are emitted outside battery limit in the whole process.

Description

technical field [0001] The invention belongs to the field of purification and treatment of organic waste gas, and more particularly relates to a purification method for waste gas containing high-concentration propylene oxide or ethylene oxide produced by a polyether production device. Background technique [0002] Polyether polyol is made of polyol as the initiator, with propylene oxide (PO) or ethylene oxide (EO) as the main raw material, under the action of amine catalyst, under the conditions of reaction temperature 100-120 °C and pressure 3Mpa , prepared by ring-opening polymerization, the polymerization reaction system is a batch operation process. During the production of polyether polyols, nitrogen is supplemented with the consumption of propylene oxide or ethylene oxide during the reaction to increase the reaction pressure, thereby increasing the conversion rate of propylene oxide or ethylene oxide. After the polymerization reaction is over, the system adopts the me...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/72B01J20/20B01J20/32
Inventor 张宏科姚雨陈斌王海峰徐辉刘林华卫琦
Owner WANHUA CHEM GRP
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