Polyamide composite sea water desalination film and preparation method thereof

A composite membrane and polyamide technology, applied in the field of water treatment, can solve the problem that the improvement is not very obvious, and achieve the effects of high desalination rate, enhanced bearing capacity, and short process flow

Inactive Publication Date: 2015-04-01
HUNAN OVAY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101601975A discloses a method for preparing a composite reverse osmosis membrane. A certain amount of biphenyl tetracarbonyl chloride is mixed in the trimesoyl chloride oil phase solution to improve the compression resistance of the polyamide composite membrane, but the improvement is not very obvious

Method used

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  • Polyamide composite sea water desalination film and preparation method thereof
  • Polyamide composite sea water desalination film and preparation method thereof
  • Polyamide composite sea water desalination film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare a high cross-linking seawater desalination composite membrane according to the following steps:

[0020] Preparation of support base layer: Weigh 75g of polysulfone resin (PSF), 375g of N-methylpyrrolidone (NMP), and 50g of polyethylene glycol 200 (PEG200), and mix them to prepare a 500g solution. Stir at 70°C for 6 hours to prepare a uniformly dispersed casting solution. After the casting solution is filtered and vacuum degassed, it is evenly coated on the non-woven fabric on a film scraping machine. The wet film thickness is 150 μm. After evaporating at room temperature for 3 seconds, it is immersed in ultra-pure water at 16°C to gel and solidify to form a film. , and finally the membrane is completely cured by water at room temperature, and finally the membrane is treated in 75°C water for 3 minutes to obtain a supporting base layer, which is stored in a freezer at 5°C until use.

[0021] Preparation of amine-containing solution: Weigh 299g of m-phenylenedia...

Embodiment 2

[0026] The steps are the same as in Example 1, except that the amount of phenylenediamine in the amine solution is 298 g, and the amount of melamine is 2 g. See Table 1 for the data.

Embodiment 3

[0028] The steps are the same as in Example 1, except that the amount of phenylenediamine in the amine solution is 295 g, and the amount of melamine is 5 g. See Table 1 for the data.

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Abstract

The invention provides a polyamide composite sea water desalination film. The polyamide composite sea water desalination film comprises a supporting base layer and a polyamide functional layer; the polyamide functional layer is prepared from m-phenylenediamine, a polyamine compound and a poly-acyl chloride compound by reacting; the polyamine compound is selected from an aza-aromatic nucleus polyamine compound and an aliphatic polyamine compound. The polyamide composite sea water desalination film has the advantages that a polyamine compound polymeric monomer is added to water phase to improve the crosslinking degree of the polyamide functional layer; therefore, the bearing capacity of the sea water desalination film under high seepage pressure can be improved, and moreover, the desalination rate can be raised while high throughout is ensured. The invention also provides a preparation method of the compound sea water desalination film. The sea water desalination film is high in desalination rate and high in water throughout; the preparation method is simple, the technological process is short, and the cost is low, so that a good application prospect is brought.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a high-performance polyamide seawater desalination composite membrane and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the shortage of water resources worldwide has become increasingly apparent. Seawater accounts for more than 99% of the world's total water resources, but it cannot be used directly because it contains a large amount of inorganic salts. Research and development of seawater desalination technology has become an important way to solve the shortage of human water resources. The technologies currently used in seawater desalination are mainly divided into two categories: one is thermal method; the other is membrane method. Among them, the thermal methods are mainly multi-stage flash distillation (MSF) and low-temperature multiple-effect distillation (LT-MED). These two distillation methods have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00C02F1/44C02F103/08
CPCY02A20/131
Inventor 喻慧彭博胡群辉贺攀王进王纯清路宏伟
Owner HUNAN OVAY TECH CO LTD
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