Preparation and application of sodium alginate pervaporation hybrid membrane

A technology of pervaporation and sodium alginate, applied in the field of separation membrane, can solve the problems of poor anti-pollution, broken hollow fiber membrane, insufficient mechanical strength of pure sodium alginate membrane, etc., and achieve good separation effect

Inactive Publication Date: 2012-10-24
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hollow fiber membrane is prone to broken wires during use, and the anti-pollution property is poor, so the system is not easy to run stably for a long time, while the flat membrane has great advantages in this respect
[0007] At present, there is no research on sodium alginate

Method used

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  • Preparation and application of sodium alginate pervaporation hybrid membrane
  • Preparation and application of sodium alginate pervaporation hybrid membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 4g of sodium alginate and dissolve it in 46g of distilled water, stir at 70°C until the sodium alginate is completely dissolved, weigh 0.08g of phosphotungstic acid and 50g of distilled water, dissolve it for 30min at an ultrasonic frequency of 50KHz, and then slowly add it to the seaweed In the sodium alginate solution, continue to stir for 24 hours, adjust the pH between 6-8 with alkali, and maintain the mass percentage of sodium alginate in the solution at 4%. The solution was filtered through a sand core funnel and allowed to stand for defoaming. Put the non-woven fabric in a polyacrylonitrile solution with a mass fraction of 2% for 30 minutes, put it in a water bath at 30° C. and 60° C. for 1-2 hours, and dry it at room temperature. Apply the prepared casting solution evenly on the surface of the base film with a doctor knife, and dry it in vacuum at 60-70°C for 24 hours, then place the hybrid film in the cross-linking solution for cross-linking reaction, the...

Embodiment 2

[0033] As in the process steps of Example 1, wherein only the amount of phosphotungstic acid is changed to 0.16g, the sodium alginate organic-inorganic hybrid membrane of the present invention is made, and its performance is shown in the following table:

[0034] Feed liquid concentration (methanol WT%)

Embodiment 3

[0036] As in the process steps of Example 1, wherein only the amount of phosphotungstic acid is changed to 0.24g, the sodium alginate organic-inorganic hybrid membrane of the present invention is made, and its performance is shown in the following table:

[0037] Feed liquid concentration (methanol wt%)

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PUM

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Abstract

The invention discloses a sodium alginate pervaporation hybrid membrane for separating aqueous methanol solution, a preparation method and an application of the sodium alginate pervaporation hybrid membrane. Raw materials of the sodium alginate pervaporation hybrid membrane include sodium alginate and inorganic aid. The preparation method for the sodium alginate pervaporation hybrid membrane includes the following steps: mixing the sodium alginate and the inorganic aid to obtain membrane casting solution; and preparing the sodium alginate pervaporation hybrid membrane for separating the aqueous methanol solution by the aid of a solution casting method. The prepared organic-inorganic hybrid membrane is a highly hydrophilic pervaporation membrane, applicable to dehydrating of organic solvent, has good separation effect compared with other membranes which are difficult to separate the aqueous methanol solution, and meanwhile, has good separation effect for aqueous solutions such as aqueous ethanol solution, aqueous isopropanol solution.

Description

technical field [0001] The invention belongs to the field of separation membranes, and in particular relates to a pervaporation hybrid membrane for separating alcohol aqueous solution, a preparation method and an application thereof. Background technique [0002] Due to its high quality, good stability and strong market operability, methanol diesel has great application prospects in the field of biodiesel. Its promotion is in line with my country's new energy policy and sustainable development strategy. At present, biodiesel manufacturers usually use ion exchange resins, rectification and other methods to separate and purify methanol aqueous solution, but the process is complicated and energy consumption is high, which increases the production cost of biodiesel and has no obvious advantages in market competition. [0003] Pervaporation is a new membrane technology for the separation of liquid mixtures. It uses the osmotic pressure difference between the components as the dri...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D71/06B01D71/02B01D67/00B01D69/12C07C29/76C07C31/04
Inventor 董锐孙晓斌张建勋周健卓婵
Owner YANCHENG INST OF TECH
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