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Preparation of sodium polyimide filtering membranes for concentrated extracted liquid of antibionic solvent

A technology of polyimide nano and polyimide, which is applied in the field of preparation of polyimide nanofiltration membrane, and can solve the problems of difficult preparation and poor solubility of polyimide

Active Publication Date: 2007-05-09
DALIAN EUROFILM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the monomer structure, most polyamic acids are prone to intermolecular cross-linking reactions during imidization, and the resulting polyimide is an insoluble material, making it difficult to prepare the required membrane by phase inversion.
At present, there is no literature report on the use of partially imidized materials to form films to overcome the problem of poor solubility of polyimides.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, the preparation method of polyimide flat nanofiltration membrane: Weigh 15g of polyimide dried to constant weight at 50°C, and dissolve it in 30mL of N-methylpyrrolidone and 24mL of acetone with electromagnetic stirring at room temperature Add 3.5g of polyvinyl alcohol additive to the mixed solvent, dissolve evenly, filter with 300 mesh stainless steel mesh, and let the filtrate stand for degassing for 24 hours for later use. Under the conditions of dust-free, 30°C, and relative humidity of 50%, apply the casting solution obtained above on a glass plate or a porous bottom layer, control the thickness of the film to about 50 μm, and control the volatilization time for 60 seconds, and then immerse in a water coagulation bath film forming.

[0020] Membrane post-treatment method: After rinsing the membrane in the coagulation bath for 24 hours, the membrane was soaked in ethanol and isopropanol for 24 hours in turn, and after drying, it was placed in an environme...

Embodiment 2

[0022] Embodiment 2, the preparation method of polyimide hollow fiber nanofiltration membrane: take the dried soluble polyimide 150g, make it dissolve in the mixed solvent of 300mL N-methylpyrrolidone and 240mL acetone under room temperature electromagnetic stirring, Add 30g of polyvinyl alcohol, dissolve evenly, filter through a 300 mesh stainless steel mesh, and let the filtrate stand for degassing for 24 hours for later use. At room temperature of 25°C, the casting liquid is spun into a hollow fiber membrane with a hollow fiber spinning machine, the coagulation bath and the core liquid are water, the distance between the spinning head and the coagulation bath is controlled to be 25 cm, and the spinning speed is 2.5 m / s. The core fluid flow rate is 2.8m / s.

[0023] Membrane post-treatment method: Rinse the prepared hollow fiber membrane in a coagulation bath for 24 hours, then soak in ethanol, isopropanol, and n-hexane for 24 hours in sequence, then place it in an environmen...

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Abstract

A nano-class filtering polyimide membrane for concentrating the antibiotic extracting solvent is prepared through preparing the filming liquid from the polyimide imidated partially, filming by phase transfer method, and heat post treating for imidating and cross-linking. It can be used for the antibiotic-solvent separation system.

Description

Technical field: [0001] The invention relates to a preparation method of a polyimide nanofiltration membrane used for concentrating antibiotic solvent extract. The prepared nanofiltration membrane belongs to organic polymer membrane. Specifically, the polyimide polymer membrane is prepared by the phase inversion method. By adjusting the composition of the casting solution and controlling the phase inversion membrane production conditions, a series of nanofiltration membranes prepared can be suitable for separating different antibiotics / solvent separation systems. . Background technique: [0002] In a typical antibiotic production process, the antibiotic stock solution produced by the fermentation method needs to be extracted by a solvent, and then a series of complex processes such as washing, acidity adjustment, reverse phase extraction, filtration, and concentration are required to finally obtain the finished product. During this process, organic solvents, alkalis, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64
Inventor 孔瑛俞继仙史德青王云芳杨金荣
Owner DALIAN EUROFILM IND