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Method for continuously deoxidizing deionized water

A deionized water and centrifugal pump technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as unsatisfactory deoxygenation effect, large steam waste water consumption, steam consumption, etc.

Active Publication Date: 2012-08-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This deionized water continuous deoxygenation process not only consumes steam for vacuuming, but also uses water to cool the steam discharged from the steam jet pump, which consumes a lot of steam and water and produces a lot of waste water at the same time, and the production cost is high.
Affected by the fluctuation of steam pressure, the vacuum control of the packed tower is also unstable, and the oxygen removal effect is not ideal

Method used

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  • Method for continuously deoxidizing deionized water
  • Method for continuously deoxidizing deionized water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the deionized water deaeration tower 1 tower with a tower height of 6600mm and a tower diameter of 660mm, it is filled with packing accounting for 1 / 3 of the total tower volume. The packing is at the top of the column. Adopt water ring vacuum pump 3 to evacuate. The vacuum pump continuously evacuates the tower through the pipeline located 20cm below the packing. The vacuum degree of the tower is controlled by adjusting the opening degree of the inlet valve of the vacuum pump. The deionized water is continuously input by the deionized water delivery pump 2, and the intake volume is 20m 3 / h, the pressure of the packed tower is 6KPa (absolute pressure), and the oxygen content in the desalted water output from the tower is 0.18ppm.

Embodiment 2

[0014] In the deionized water deaeration tower 1 tower with a tower height of 6600mm and a tower diameter of 660mm, it is filled with packing accounting for 1 / 3 of the total tower volume. The packing is at the top of the column. Evacuate with a water ring vacuum pump. The vacuum pump continuously evacuates the tower through the pipeline located 20cm below the packing. The vacuum degree of the tower is controlled by adjusting the opening degree of the inlet valve of the vacuum pump. When the continuous feed volume of deionized water is 25m 3 / h, the pressure of the packed tower is 5KPa (absolute pressure), and the oxygen content in the desalted water output from the tower is 0.17ppm.

Embodiment 3

[0016] In the deionized water deaeration tower 1 tower with a tower height of 6600mm and a tower diameter of 660mm, it is filled with packing accounting for 1 / 3 of the total tower volume. The packing is at the top of the column. Evacuate with a water ring vacuum pump. The vacuum pump continuously evacuates the tower through the pipeline located 20cm below the packing. The vacuum degree of the tower is controlled by adjusting the opening degree of the inlet valve of the vacuum pump. When the continuous feed volume of deionized water is 30m 3 / h, the pressure of the packed tower is 4KPa (absolute pressure), and the oxygen content in the desalted water output from the tower is 0.18ppm.

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Abstract

The invention relates to a method for continuously deoxidizing deionized water which is a raw material in a process for producing acrylamide by hydration of acrylonitrile in the presence of a copper catalyst. A filler is filled in a packed column of which the height-diameter ratio is 10 to 1 in one third volume, wherein the filler is an inwards bent arc rib flat and annular filler which is 4 / 3 centimeters long and is filled on the top part of the column; the deionized water is continuously filled from the top part of the packed column, is gathered at the bottom of the column after passing through a distributor and the packed column, and is continuously pumped to a storage tank by a centrifugal pump; and a vacuum pump continuously vacuumizes the column through a pipeline positioned at the place 20 centimeters below the filler so as to keep the vacuum degree of the packed column between 4 and 6KPa. By the method, oxygen content of the deionized water can be kept below 0.2ppm and production cost can be reduced by 96 percent.

Description

technical field [0001] The invention relates to a technology for continuous deoxygenation of raw material deionized water in the technology of producing acrylamide by copper-catalyzed acrylonitrile hydration. Background technique [0002] Copper-catalyzed production of acrylamide technology uses deionized water and acrylonitrile as raw materials. Under the action of copper catalyst, acrylonitrile and water undergo hydration reaction to form acrylamide. In order to prevent the copper catalyst from being oxidized and its activity reduced, and the side reactions increase during the reaction process, the raw material deionized water must be deoxidized to ensure that the oxygen content in the deionized water is below 0.4ppm. [0003] The usual deionized water continuous deoxygenation process is that the deionized water is continuously fed into the packed tower, and the packed tower is evacuated by a steam jet pump to achieve the purpose of deoxygenating the deionized water. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F101/10
Inventor 周云霞李东吉高俊陈猛于绍斌崔守信杨军宋廷伟李红梅刘晶
Owner PETROCHINA CO LTD