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System and method for recovering byproducts in epoxypropane production by HPPO process

A recovery system and technology of propylene oxide, applied in the field of separation, can solve problems such as waste of resources, achieve the effects of reducing COD, facilitating subsequent processing, and improving resource utilization

Pending Publication Date: 2019-12-24
胜帮科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above methods all oxidize the waste water containing oily propylene glycol, propylene glycol methyl ether and propylene glycol methyl ether isomers by oxidation, resulting in waste of propylene glycol, propylene glycol methyl ether and propylene glycol methyl ether isomer resources

Method used

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  • System and method for recovering byproducts in epoxypropane production by HPPO process
  • System and method for recovering byproducts in epoxypropane production by HPPO process

Examples

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Embodiment 1

[0079] This embodiment provides a system for recovering by-products of propylene oxide produced by HPPO method. The system for recovering by-products of propylene oxide produced by HPPO method includes an evaporation unit, a propylene glycol recovery unit and a propylene glycol methyl ether recovery unit.

[0080] The evaporation unit includes a first evaporator 11 and a second evaporator 12 connected in sequence.

[0081] Described propylene glycol recovery unit comprises the first propylene glycol rectification tower 81 and the second propylene glycol rectification tower 82 connected successively, and the bottom outlet of the first propylene glycol rectification tower 81 is connected with the inlet of the second propylene glycol rectification tower 82 ; The feed port of the first propylene glycol rectifying tower 81 is connected with the drain port of the second evaporator 12 .

[0082] The propylene glycol methyl ether recovery unit includes a demethanol rectification tower...

Embodiment 2

[0086] This embodiment provides a system for recovering by-products of propylene oxide produced by HPPO method. The system for recovering by-products of propylene oxide produced by HPPO method includes an evaporation unit, a propylene glycol recovery unit and a propylene glycol methyl ether recovery unit.

[0087] The evaporation unit includes a first evaporator 11 and a second evaporator 12 connected in sequence.

[0088] Described propylene glycol recovery unit comprises the first propylene glycol rectification tower 81 and the second propylene glycol rectification tower 82 connected successively, and the bottom outlet of the first propylene glycol rectification tower 81 is connected with the inlet of the second propylene glycol rectification tower 82 ; The feed port of the first propylene glycol rectifying tower 81 is connected with the drain port of the second evaporator 12 .

[0089] The propylene glycol methyl ether recovery unit includes a demethanol rectification tower...

Embodiment 3

[0093] This embodiment provides a system for recovering by-products of propylene oxide produced by HPPO method. The system for recovering by-products of propylene oxide produced by HPPO method includes an evaporation unit, a propylene glycol recovery unit and a propylene glycol methyl ether recovery unit.

[0094] The evaporation unit includes a first evaporator 11 and a second evaporator 12 connected in sequence.

[0095] Described propylene glycol recovery unit comprises the first propylene glycol rectification tower 81 and the second propylene glycol rectification tower 82 connected successively, and the bottom outlet of the first propylene glycol rectification tower 81 is connected with the inlet of the second propylene glycol rectification tower 82 ; The feed port of the first propylene glycol rectifying tower 81 is connected with the drain port of the second evaporator 12 .

[0096] The propylene glycol methyl ether recovery unit includes a demethanol rectification tower...

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Abstract

The invention provides a system and method for recovering byproducts in epoxypropane production by HPPO process. The system comprises an evaporation unit, a propylene glycol recovery unit and a propylene glycol methyl ether recovery unit. The evaporation unit comprises at least two stages of evaporation devices which are connected in sequence; the propylene glycol recovery unit comprises at leasttwo stages of rectifying towers, which are connected in sequence; the propylene glycol methyl ether recovery unit comprises a methanol removal device, a concentration device, an extraction device, anextraction recovery device, a dehydration device and a separation device, which are connected in sequence, and an exhaust port of the evaporation unit is connected with a feeding port of the methanolremoval device. According to the method, the wastewater generated during epoxypropane production is recycled, so that the effects of energy conservation and emission reduction are achieved, and the efficiency of subsequent oxidation treatment can be improved; the recovery rate of propylene glycol monomethyl ether reaches 99% or above, and the purity of propylene glycol monomethyl ether and propylene glycol isomonomethyl ether can reach 99.5%; the recovery rate of propylene glycol can reach 99% or above, and the purity of propylene glycol can reach 99.5%.

Description

technical field [0001] The invention belongs to the field of separation technology, and relates to a system and method for recycling waste water, in particular to a system and method for recycling by-products of propylene oxide produced by an HPPO method. Background technique [0002] Propylene oxide (PO) is an important basic organic chemical raw material. PO is mainly used to produce polyether, propylene glycol and isopropanolamine, and can also be used as the main component of surfactant, demulsifier and pesticide emulsifier. Raw materials and their derivatives are widely used in industries such as automobiles, construction, food, tobacco, and cosmetics, and are important raw materials for fine chemical products. [0003] At present, the methods for producing PO include the chlorohydrin method, the co-oxidation method and the hydrogen peroxide oxidation method (HPPO method), wherein the HPPO method is a new type of propylene oxide production method, which can overcome the...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C31/20C07C41/34C07C43/13
CPCC07C29/76C07C41/34C07C31/205C07C43/13
Inventor 汤奕婷常伟先任鹏周晓晓邢立伟
Owner 胜帮科技股份有限公司
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