Process of extracting polymethylene polyphenyl polyamine from its salt water solution

A technique for polymethylene polyphenyl and brine, applied in the field of extracting polymethylene polyphenyl polyamines from brine and extracting polyamines

Active Publication Date: 2007-08-22
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Process of extracting polymethylene polyphenyl polyamine from its salt water solution

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Effect test

Embodiment 1

[0027] Turn on the high-gravity rotary bed 3, adjust the rotating speed to 1000 rpm, and adjust the valve 1 to stabilize the flow rate of the saline solution containing polymethylene polyphenyl polyamines at 1000L / h, and the polymethylene polyphenyl polyamines in the saline solution The amine content is 1355mg / L, with aniline (purity 99.5%) as the extractant, the valve 2 is adjusted to stabilize the flow rate of the extractant at 100L / h, and the brine and extractant flow from the inner edge of the supergravity rotating bed rotor to The outer edge flows into the separator 4 through the liquid outlet. Adjust the liquid level in the separator 4 so that the residence time of the liquid in the separator 4 is 1.5 hours, the solution is layered, the upper part is the extractant phase, and the lower part is the brine phase. The extraction phase is drawn from the upper part of the separator, and the raffinate phase is drawn from the lower part of the separator 4 and flows into the tank...

Embodiment 2

[0029] Open the high-gravity rotary bed 3, adjust the rotating speed to 500 rpm, and adjust the valve 1 to stabilize the flow rate of the saline solution containing polymethylene polyphenyl polyamines at 100L / h, and the polymethylene polyphenyl polyamines in the saline solution The amine content is 1055mg / L, with p-methylaniline (purity is 99%) as extraction agent, regulating valve 2 makes the extraction agent flow rate stable at 900L / h, brine and extraction agent are produced by the supergravity rotating bed rotor under centrifugal force The inner edge flows to the outer edge, through the liquid outlet into the separator 4 . Adjust the liquid level in the separator 4 so that the residence time of the liquid in the separator 4 is 1.0 hour, the solution is layered, the upper part is the extractant phase, and the lower part is the brine phase. The extraction phase is drawn from the upper part of the separator, and the raffinate phase is drawn from the lower part of the separator 4...

Embodiment 3

[0031] Turn on the high-gravity rotary bed 3, adjust the rotating speed to 1000 rpm, and adjust the valve 1 to stabilize the flow rate of the saline solution containing polymethylene polyphenyl polyamines at 1000L / h, and the polymethylene polyphenyl polyamines in the saline solution The amine content is 1135mg / L, with aniline (purity 99.5%) as the extractant, the valve 2 is adjusted to stabilize the flow rate of the extractant at 200L / h, the brine solution and the extractant flow from the inner edge of the supergravity rotating bed rotor to the The outer edge flows into the separator 4 through the liquid outlet. Adjust the liquid level in the separator 4 so that the residence time of the liquid in the separator 4 is 2.0 hours, the solution is layered, the upper part is the extractant phase, and the lower part is the brine phase. The extraction phase is drawn from the upper part of the separator, and the raffinate phase is drawn from the lower part of the separator 4 and flows ...

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Abstract

The present invention relates to salt solution treating technology, and is especially process of extracting polymethylene polyphenyl polyamine from its salt water solution. The process includes two steps, extraction and separation. In the extraction step, salt water solution and extractant are mixed fast in a hypergravital rotation bed as the extractor, and polymethylene polyphenyl polyamine is extracted from the salt water phase to extracted liquid phase. In the separation step, the extracted liquid phase is separated from the salt water phase in separating apparatus. One stage of extraction can reduce the concentration of polymethylene polyphenyl polyamine in salt water from about 1000 mg/L to below 20 mg/L, and two stages of extraction can reduce to below 1 mg/L. The present invention has greatly raised extraction efficiency and reuse of the waste salt solution.

Description

1. Technical field [0001] The invention relates to a method for extracting polyamines from saline waste water, in particular to a method for extracting polymethylene polyphenyl polyamines from brine, and belongs to the technical field of brine treatment. 2. Technical background [0002] MDI is one of the main raw materials in the polyurethane industry. Using MDI to react with polyether or polyester polyols, etc., under the action of catalysts, foaming agents, etc., various polyurethane polymer materials can be prepared, which can be widely used in polyurethane rigid, semi-rigid foam plastics, and reaction casting molding. , Reinforced reaction casting molded polyurethane products, as well as thermal insulation materials, synthetic fibers (spandex), adhesives and elastomers and other fields. [0003] Aniline and formaldehyde are condensed under the action of hydrochloric acid catalyst to obtain polymethylene polyphenyl polyamine (abbreviated as polyamine, DAM). Then neutral...

Claims

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Application Information

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IPC IPC(8): C07C209/86C07C211/50B01D11/00
Inventor 丁建生陈建峰华卫琦张鹏远张宏科邹海魁孙淑常初广文杜永顺许利民
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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