Method for recovering epoxy chloropropane from wastewater containing epoxy chloropropane

A technology of epichlorohydrin and waste water, applied in the direction of heating water/sewage treatment, organic chemistry, etc., can solve the problem that epichlorohydrin is difficult to obtain, and achieve the goal of reducing difficulty and cost, low operating cost, and large processing capacity Effect

Inactive Publication Date: 2010-03-10
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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Problems solved by technology

If the waste water is separated by conventional distillation methods, it is difficult to

Method used

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  • Method for recovering epoxy chloropropane from wastewater containing epoxy chloropropane

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Embodiment 1

[0023] Preheat the epichlorohydrin wastewater with a content of about 3%, a COD of 72216mg / L, and a COD (chemical oxygen demand, the same below) of 72216mg / L to 80°C, and then use 1.5-2m 3 The flow rate of / h is pumped from the top of the tower to the stripping tower, the pressure of the bottom of the tower is controlled to 0.0029-0.0030Mpa, the temperature of the top of the tower is ≥95°C, and 99.2% of epichlorohydrin is obtained from the phase separator. The COD discharged from the tower kettle is 17136mg / L, and the COD is 23.73% of the original.

Embodiment 2

[0025] Preheat the epichlorohydrin wastewater with an epichlorohydrin content of 2% and a COD of 48144mg / L to 60°C in a 1.5m 3 The flow rate of / h is pumped into the stripping tower from the top of the tower, the pressure of the bottom of the tower is controlled to 0.0029-0.0030Mpa, the temperature of the top of the tower is ≥95°C, and 99.3% of epichlorohydrin is obtained from the phase separator. The COD discharged from the tower kettle was 11352mg / L, and the COD decreased by 76.42%.

Embodiment 3

[0027] Preheat the epichlorohydrin waste water with 5% epichlorohydrin content and 180540 mg / L COD to 90 ° C and use 2m 3 The flow rate per hour is pumped into the stripping tower, the pressure in the bottom of the tower is controlled to 0.0029-0.0030Mpa, the temperature at the top of the tower is ≥95°C, and 99.1% of epichlorohydrin is obtained from the phase separator. The COD discharged from the tower kettle was 43347mg / L, and the COD was reduced by 75.99%.

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Abstract

The invention relates to a method for recovering epoxy chloropropane from wastewater containing epoxy chloropropane, which comprises the following steps: preheating wastewater to 60-90 DEG C and thenspraying from the top of a tower body of an air stripping tower; charging water vapor from a reboiler of a tower kettle; introducing rising steam in the tow kettle to carry out heat exchange with thewastewater containing epoxy chloropropane; condensing the steam at the top of the tower body and then entering a phase splitter to precipitate and delaminate; and acquiring the epoxy chloropropane atthe lower layer, wherein the air stripping tower comprises the tower body positioned at the upper part and the tower kettle positioned at the lower part, and the reboiler of the tower kettle is arranged in the tower kettle. The method can recover the epoxy chloropropane with the content being larger than and equal to 99 percent from the wastewater containing 2-5 percent of epoxy chloropropane, andthe epoxy chloropropane can be directly used as a raw material for producing epoxy resin; and the invention has large processing ability, high recovery rate, investment saving and low running cost, greatly reduces the specific consumption for producing the epoxy resin and reduces the difficulty and the cost for directly carrying out biochemical treatment on the wastewater containing the epoxy chloropropane.

Description

technical field [0001] The invention relates to the field of epoxy resin production, in particular to a method for recovering epichlorohydrin from waste water containing epichlorohydrin. Background technique [0002] Epichlorohydrin is one of the main raw materials for the production of epoxy resin. In the production of epoxy resin, the excess epichlorohydrin in the system and the water generated by the reaction must be recovered by vacuum azeotropic distillation. Epichlorohydrin and After the water mixture is left to stand and stratified, the epichlorohydrin in the lower layer is directly used as a raw material for production, and the water phase in the upper layer is waste water. Epichlorohydrin is slightly soluble in water, and the solubility in water at room temperature is about 6g / 100mL. Because the epichlorohydrin content in this waste water is low (about 2~3%), can't directly be used as raw material for production; Discharge is bound to cause serious pollution and w...

Claims

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Application Information

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IPC IPC(8): C07D303/08C07D301/32C02F1/04
Inventor 杨林茂王家贵蒲建光陈秀琳
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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