Ethylenediamine waste water recovery technology

A wastewater recovery and ethylenediamine technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, organic chemistry, etc., can solve the problems of high treatment cost of amine-containing wastewater and low EDA recovery rate. Low cost, high oil-water separation efficiency, and small footprint

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0017] The invention provides an ethylenediamine (EDA) wastewater recovery process, which mainly solves t

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  • Ethylenediamine waste water recovery technology

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Embodiment 1

[0039] Liquid ammonia and MEA enter R101 after being heated and gasified, and the reaction product (stream 1) enters the ammonia recovery system X101 to recover ammonia. After the ammonia is recovered, the mixture containing MEA (stream 2) enters the dehydration tower T101 for azeotropic distillation and dehydration, and the top gas passes through Condenser E-101 enters the dehydration tower phase separation tank D101 to stand still (the standing time exceeds 60 minutes). The organic phase behind the water is refluxed as the dehydration tower T101, and waste water (stream 3) and residual water enter the EDA recovery tower T102 (supplementary entrainer (stream 4) joins the reflux line), pressurized rectification, and the tower top production liquid (stream 6) It mainly contains entraining agent and a small amount of water and EDA. It is sent to the EDA recovery tower T102 phase separation tank D102 to stand still (the standing time exceeds 60 minutes). After the phase separation...

Embodiment 2

[0047] Embodiment is identical with embodiment 1.

[0048] Wherein, entrainer is cyclohexane.

[0049] The theoretical plate number of the dehydration tower T101 is 40, the operating pressure is 0.05MPaA, the temperature at the top of the tower is 79.5°C, and the phase separation temperature of the phase separation tank at the top of the dehydration tower is 45°C.

[0050] The theoretical plate number of EDA recovery tower T102 is 65, the operating pressure is 0.50MPaA, and the temperature at the top of the tower is 152°C. Under this pressure, EDA and water azeotrope disappear, the light component rises to the top of the tower, and the heavy component EDA goes to the bottom of the tower. When the water rises to the top of the tower, it forms an azeotrope with the entrainer and entrains the entrainer.

[0051] The theoretical plate number of the EDA product column is 70, the operating pressure is 0.05MPaA, and the temperature at the top of the column is 82.3°C. The EDA produc...

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Abstract

The invention relates to an ethylenediamine (EDA) waste water recovery technology. The technology mainly solves the problem that the prior art has a low EDA recovery rate and a high amine-containing waste water treatment cost. The technology comprises carrying out pressurized distillation treatment on waste water containing a small amount of an entrainer and EDA from a dehydrating tower through an EDA recovery tower, transferring the entrainer and water from the tower top into a phase separation tank, carrying out phase separation, circulating the organic phase as an entrainer (mainly comprising the entrainer) to the dehydrating tower, feeding the waste water phase (mainly containing water) into a high efficiency coalescing separator, separating the residual entrainer, circulating the residual entrainer to the dehydrating tower, feeding the separated waste water to an aftertreatment section, mixing and feeding a dehydrating tower bottom liquid and an EDA recovery tower bottom liquid into an EDA product tower, collecting the entrainer and a small amount of EDA at the tower top, feeding the collected materials to the EDA recovery tower and collecting an EDA product at the side line below the top of the EDA product tower. The technology can effectively recover EDA and an entrainer in waste water, reduce a waste water treatment cost, well solves the above problem and can be used in EDA production.

Description

technical field [0001] The invention relates to an ethylenediamine wastewater recovery process, in particular to the wastewater recovery process in the ethylenediamine production process by ethanolamine (MEA) catalytic ammonification. Background technique [0002] Ethylenediamine (EDA) is an organic base with amine functional groups. It has the characteristics of surface activity and is a chemically active fine intermediate and pharmaceutical intermediate. EDA is easily soluble in water to form ethylenediamine hydrate, easily soluble in ethanol and methanol, slightly soluble in ether, and insoluble in benzene. EDA has a wide range of uses, and is widely used in organic compounds, polymer compounds, medicine, dyes, pesticides and other industries. It is an important fine chemical intermediate that needs to be imported urgently in China. Chelating agent EDTA, paper wetting enhancer, lubricating oil stabilizer, pesticide fungicide, rubber vulcanization accelerator, dye fixing ...

Claims

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Application Information

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IPC IPC(8): C07C211/10C07C209/86C02F9/08
Inventor 胡松杨卫胜刘银川王德举
Owner CHINA PETROLEUM & CHEM CORP
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