Method for desalting acidified mother solution of iminodiacetic acid using nanofiltration technology
An iminodiacetic acid and nanofiltration technology is applied in chemical instruments and methods, preparation of organic compounds, ultrafiltration, etc., to achieve the effect of easy continuous production, simple operation process, and realization of recycling.
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Embodiment 1
[0029] The device for desalination of iminodiacetic acid acidified mother liquor using nanofiltration technology can be used as figure 1 device shown. Including acidification tank 1, feed valve 2, feed liquid tank 3, feed valve 4, feed pump 5, microfiltration membrane module 6, return valve 7, feed liquid tank 8, feed valve 9, feed pump 10, The nanofiltration membrane module 11, the return valve 12, and the return pump 13; the nanofiltration desalination process adopts the percolation method.
[0030] An acidification tank 1 is communicated with the feed port of the feed liquid tank 3 through a pipeline with a feed valve 2, and the discharge port of the feed liquid tank 3 is connected with the feed pump 5 through a pipeline with a feed valve 4. The feed port is connected, and the discharge port of the feed pump 5 is connected with the feed port of the microfiltration membrane module 6 through a pipeline, and the retained liquid discharge port at one end of the feed port in th...
Embodiment 2
[0033] Using the device in Example 1, the nanofiltration desalination process adopts a concentration method.
[0034] The microfiltration operation and conditions of iminodiacetic acid acidified mother liquor are the same as in Example 1, and the permeate is 66.37L.m -2 .h -1The membrane flux passes through the flat polyamide nanofiltration membrane module 11 with a molecular weight cut off (MWCO) of about 150Da, until the volume of the retentate in the feed liquid tank 8 is concentrated to the permeate obtained after the pretreatment of the microfiltration membrane module. When the volume reaches 1 / 2, stop the operation, close the feed pump 10 and the feed valve 9, and the operating pressure in the process is about 2.5~3.8Mpa. The content of iminodiacetic acid in the mother liquor obtained at this moment is about 58.1g / L, and the salt content becomes 80.8g / L (the desalination rate is calculated by mass, and the quality is related to concentration and volume, and the desalina...
Embodiment 3
[0036] Using the device of Example 1, the nanofiltration desalination process adopts a combination of concentration and diafiltration.
[0037] The microfiltration operation and conditions of iminodiacetic acid acidified mother liquor are the same as in Example 1, and the permeate is 66.37L.m -2 .h -1 The membrane flux passes through the flat polyamide nanofiltration membrane module 11 with a molecular weight cut off (MWCO) of about 150Da, until the volume of the retentate in the feed liquid tank 8 is concentrated to the permeate obtained after the pretreatment of the microfiltration membrane module. When the volume is 2 / 3, start to add deionized water in the feed liquid tank 8, control the rate of water addition to be equal to the permeation flux of the nanofiltration membrane, until the water consumption is equal to 1 / 2 of the volume of the retained liquid in the feed liquid tank 8 Stop operation, close feed pump 10 and feed valve 9, and the operating pressure in the proces...
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