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Tail gas treatment method for producing epoxypropane through cumene co-oxidation method

A technology of cumene peroxidation and propylene oxide, applied in chemical instruments and methods, combustion methods, separation methods, etc., can solve the problems of difficulty in condensation of cumene, poor atom economy, and high unit consumption of cumene, and achieves The effect of saving one-time investment, saving operating costs, and reducing the size of heat exchangers

Active Publication Date: 2022-02-25
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1) The peroxidation tail gas adopts two-stage condensation. After the first-stage refrigerated water is condensed, the gas phase is further cryogenically cooled by the second-stage refrigerant, and the uncondensed components are sent to incineration, resulting in high unit consumption of cumene in the POCHP process and atomic economy. poor sex
[0011] 2) The material after cryogenic condensation is directly deoxidized, which will cause the accumulation of impurities
[0013] Moreover, the cost of the refrigerant is high, and it is difficult to condense the cumene in the tail gas to a low concentration

Method used

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  • Tail gas treatment method for producing epoxypropane through cumene co-oxidation method
  • Tail gas treatment method for producing epoxypropane through cumene co-oxidation method
  • Tail gas treatment method for producing epoxypropane through cumene co-oxidation method

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Effect test

Embodiment 1

[0049] Embodiment 1: as figure 1 , a tail gas treatment method for the production of propylene oxide by co-oxidation of cumene, including that the tail gas of the peroxidation reaction directly goes to the first heat exchanger 01, and the outlet stream of the first heat exchanger 01 goes to the second heat exchanger with circulating water as the refrigerant Heat exchanger 02, the outlet of the second heat exchanger 02 goes to the gas-liquid separation tank 04, and the separated gas phase enters the third heat exchanger 03 (deep condenser), and then enters the gas-liquid separator 04 to separate the liquid phase, and the separated gas phase Enter the absorption tower 05, the gas phase at the top of the absorption tower enters the first heat exchanger 01 for heat exchange and then goes to incineration, one part of the tower kettle is cooled by the fifth heat exchanger 07 and then returns to the middle of the absorption tower, and the other part goes to the sixth heat exchanger 08...

Embodiment 2

[0055] Referring to the method of Example 1, after the peroxidation tail gas and the absorption tail gas at 20°C are directly exchanged in a heat exchanger at 70°C, the temperature is lowered to 40°C in the first stage, and the gas-liquid separation is realized after two-stage condensation, and the gas phase temperature after separation is 15°C Go to the absorption tower, the absorption tower adopts fresh absorption liquid as dicumyl (isomers), tricumene, dimethyl benzyl alcohol, the mass ratio is 0.2:0.1:0.03, and the amount of fresh absorbent added: The circulation volume of the absorbent at the bottom of the desorption tower: the circulation volume of the absorption liquid at the bottom of the absorption tower: the tail gas flow mass ratio is 0.3:3:30:120. The absorption liquid in the absorption tower enters the desorption tower to recover cumene. The mass ratio of the absorption liquid from the bottom of the absorption tower to the middle stream of the absorption tower and...

Embodiment 3

[0058] Referring to the method of Example 1, after the peroxidation tail gas and the absorption tail gas at 20°C are directly exchanged in a heat exchanger at 70°C, the temperature is lowered to 40°C in the first stage, and the gas-liquid separation is realized after two-stage condensation, and the gas phase temperature after separation is 15°C Go to the absorption tower, the absorption tower adopts the fresh absorption liquid as dicumyl (isomer), tricumene, dimethyl benzyl alcohol, the mass ratio is 0.5:0.3:0.05, the amount of fresh absorbent added: The circulation volume of the absorbent at the bottom of the desorption tower: the circulation volume of the absorption liquid at the bottom of the absorption tower: the tail gas flow mass ratio is 0.5:10:20:120. The absorption liquid in the absorption tower enters the desorption tower to recover cumene. The mass ratio of the absorption liquid at the bottom of the absorption tower to the middle stream of the absorption tower and a...

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Abstract

The invention discloses a tail gas treatment method for producing epoxypropane through a cumene co-oxidation method. According to the invention, the output end of peroxidation reaction tail gas and absorbed tail gas are subjected to cross heat exchange; the tail gas having been subjected to heat exchange enters a first-stage condenser and then enters a gas-liquid separation tank for separation after being condensed; a separated gas phase is connected with a second-stage condenser for copious cooling again and then enters the gas-liquid separation tank again; the further separated gas phase is connected with an absorption tower, and a special absorbent is adopted to absorb organic matters in the tail gas; an absorption liquid enters a desorption tower for desorption of cumene; and an absorbent at the bottom of the desorption tower is cooled and then returns to the absorption tower for recycling; and thus, cumene is recycled from the cumene peroxide tail gas, the cumene loss of a device is reduced, and the atom economy of producing epoxypropane through cumene peroxide reaction is improved.

Description

technical field [0001] The invention relates to a tail gas treatment method for producing propylene oxide by co-oxidation of cumene, belonging to the field of organic chemical industry. [0002] technical background [0003] Propylene oxide is an important basic chemical raw material, mainly used in the production of polyether polyols, propylene glycol ethers, etc., and is also widely used in the production of surfactants, demulsifiers, pesticide emulsifiers and developers, etc., with a wide range of uses. [0004] The industrial production methods of propylene oxide include chlorohydrin method, co-oxidation method (Halcon method), and hydrogen peroxide direct oxidation method (HPPO method). Among them, the chlorohydrin method is one of the main methods for domestic production of propylene oxide (PO), accounting for about 48% in China. Chlorohydrin process has disadvantages such as severe equipment corrosion, large amount of waste water and solid waste, serious environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/00F23G7/06F23G5/46F28B1/02C07D301/19C07D303/04
CPCB01D53/14B01D53/002F23G7/06F23G5/46F28B1/02C07D301/19C07D303/04
Inventor 虞根海叶建初金贞顺王悦张宏科
Owner WANHUA CHEM GRP CO LTD
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