Separation and purification method of coarse diglycolamine

A technology of diglycolamine and diethylene glycol, which is applied in the field of separation and purification of crude diglycolamine, can solve the problems of poor separation effect and inability to use industrial production, and achieve the effect of simple process, easy operation and low energy consumption

Active Publication Date: 2015-01-07
ANHUI HAOYUAN CHEM IND GRP
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  • Abstract
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  • Application Information

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Problems solved by technology

There is no effective method for separating diglycolamine in the domestic prior art, only the report of separating diglycolamine in the laboratory, but its separation effect is relatively poor and cannot be used for industrial production

Method used

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  • Separation and purification method of coarse diglycolamine
  • Separation and purification method of coarse diglycolamine
  • Separation and purification method of coarse diglycolamine

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with accompanying drawing.

[0029] As shown in Figure 1, the crude diglycolamine from the crude diglycolamine storage tank 1 is pumped into the deammonization tower 2 through the deammonization tower feed pump 5 to carry out deammoniation, and is deaminated with medium-pressure steam (2.5MPa, 300° C. ) to heat the crude diethylene glycol material in the reboiler 4 of the deamination tower to control the temperature at the top of the tower to be 35-40°C, the temperature at the bottom of the tower to be 170-180°C, and the pressure inside the deamination tower to be 1.1-1.3MPa ( absolute pressure). After the gaseous ammonia coming out from the top of the deamination tower 2 is cooled by the top condenser 3 of the deamination tower to become liquid ammonia, it returns to the deamination tower 2 and is adjusted according to process requirements. A part of the liquid ammonia is refluxed as a reflux liquid, ...

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Abstract

The invention discloses a separation and purification method of coarse diglycolamine. The method comprises the following steps: sequentially carrying out continuous distillation on coarse diglycolamine which is prepared from diglycol in a manner of catalytic ammoniation through eight towers under the pressurized or atmospheric condition; separating out diglycolamine, morpholine and diglycol from un-reacted raw materials and impurities to obtain a diglycolamine product with the purity being over 99%; and simultaneously generating a byproduct morpholine and recovering un-reacted diglycol, wherein the eight towers are sequentially a deamination tower, an atmospheric azeotropic tower, a vacuum dehydrating tower, a vacuum morpholine recovery tower, a vacuum diglycolamine refining tower, a vacuum diglycolamine tower, a vacuum diglycol refining tower and a vacuum diglycol recovery tower. The separating and refining processes of the method are low in energy consumption, simple in flow, and easy to operate; the diglycolamine product with the purity being over 99% and the morpholine byproduct with the purity being over 99.5% are obtained; and the yield reaches 99.5%.

Description

1. Technical field [0001] The invention relates to a refining method, in particular to a method for separating and purifying crude diglycolamine. 2. Background technology [0002] Diethylene glycol amine, also known as 2-(2-aminoethoxy)ethanol, molecular formula C 4 h 11 NO 2 , is a colorless syrupy liquid, is an important solvent and organic raw material, can dissolve with water, can dissolve aromatic hydrocarbons and absorb acid gas (H 2 S and CO 2 ). It is mainly used as an absorbent, surfactant, wetting agent, and desulfurizer for acidic gases, and can also be used as a raw material for polymers. It is widely used in industries such as metals, electronics, and medicine. [0003] Diethylene glycol amine can be obtained by the catalytic amination reaction of diethylene glycol and ammonia in the presence of a catalyst. There are many side reactions in the synthesis process. In addition to diglycol amine, the crude diglycol amine also contains morpholine, N- More than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C217/08C07C213/10C07C41/34C07C43/11C07D295/023C07D295/027
Inventor 郑高潮凡殿才高明林张浩吴珍汉张海生
Owner ANHUI HAOYUAN CHEM IND GRP
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