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Preparation method of mythyl p-hydroxybenzoate molecular imprinting composite membrane and application thereof

A technology of methyl hydroxybenzoate and molecular imprinting, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of inability to separate individual substances, efficient selective separation, complex equipment structure, etc. Achieve superior molecular recognition performance of methyl p-hydroxybenzoate, high adsorption and selectivity, and good thermal stability

Inactive Publication Date: 2014-03-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the solvent extraction technology uses a large amount of organic solvents, which is prone to secondary pollution; the recrystallization method is time-consuming, has a low yield, and has high requirements for the selection of solvents; as a new distillation method, molecular distillation can achieve certain organic matter. Separation, but its equipment structure is complicated, the technical requirements are strict, the investment is huge and the energy is seriously wasted; the membrane separation technology (Membrane Separation Technique, MST), which emerged in the 1860s, is characterized by its high efficiency, energy saving, convenient operation, molecular level filtration, Environmental friendliness and other advantages have been widely used in the production process of enterprises
However, there are still some factors that limit the development of traditional membrane separation technology. For example, the current commercially available membranes (ultrafiltration, microfiltration and reverse osmosis membranes) can only achieve the separation of a certain type of substance and cannot separate a single substance. For organic compounds with similar structures, traditional membranes cannot perform single and efficient selective separation of certain substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Take 0.12 g of polyvinylidene fluoride microfiltration membrane (PVDF) in 20 mL of aqueous solution containing 0.28 g of potassium hydroxide and 0.1 g of potassium dichromate, at 55 o After reacting at C for 1.5 hours, take it out, wash it with distilled water for 3 times, then soak the film in 20 mL aqueous solution containing 0.2 g sodium bisulfite for 20 min, clamp the film out, wash it with distilled water until neutral, and wash it with absolute ethanol Rinse and then dry to obtain a PVDF membrane with surface hydroxylation.

[0038] (2) Place the PVDF membrane treated in step (1) in a 100 mL conical flask, add 1.5 mL trimethylsilyl propyl acrylate (KH-570) and 20 mL toluene, and add 2 drops Triethylamine, sealed after passing nitrogen for 5 min, 70 o C water bath for 8 h, the membrane was taken out, soaked in absolute ethanol for 30 min, and dried for later use.

[0039] (3) Add 0.0761 g of methyl p-hydroxybenzoate (MP) and 0.1722 g of methacrylic acid (MAA)...

Embodiment 2

[0049] (1) Take 0.20 g of polyvinylidene fluoride microfiltration membrane (PVDF) in 20 mL of aqueous solution containing 0.56 g of potassium hydroxide and 0.15 g of potassium dichromate, at 55 o After reacting at C for 1.0 hour, take it out, wash it with distilled water for 5 times, then soak the film in 20 mL aqueous solution containing 0.24 g of sodium bisulfite for 30 min, clamp the film out, wash it with distilled water until neutral, and moisten it with absolute ethanol. Dry after washing to obtain a PVDF membrane with surface hydroxylation.

[0050] (2) Place the PVDF membrane treated in step (1) in a 100 mL conical flask, add 1.8 mL trimethylsilyl propyl acrylate (KH-570) and 25 mL toluene, and add 4 drops Triethylamine, sealed after passing nitrogen for 5 min, 70 o C water bath for 8 h, the membrane was taken out, soaked in absolute ethanol for 30 min, and dried for later use.

[0051] (3) Add 0.1522 g of methyl p-hydroxybenzoate (MP) and 0.3444 g of methacrylic aci...

Embodiment 3

[0061] (1) Take 0.16 g polyvinylidene fluoride microfiltration membrane (PVDF) in 20 mL aqueous solution containing 0.42 g potassium hydroxide and 0.125 g potassium dichromate, at 55 o Take it out after reacting at C for 1.25 hours, wash it with distilled water for 4 times, then soak the film in 20 mL aqueous solution containing 0.22 g sodium bisulfite for 25 min, clamp the film out, wash it with distilled water until neutral, and wash it with absolute ethanol Rinse and then dry to obtain a PVDF membrane with surface hydroxylation.

[0062] (2) Place the PVDF membrane treated in step (1) in a 100 mL conical flask, add 1.75 mL trimethylsilyl propyl acrylate (KH-570) and 22.5 mL toluene, and add 3 drops Triethylamine, sealed after passing nitrogen for 5 min, 70 o C water bath for 8 h, the membrane was taken out, soaked in absolute ethanol for 30 min, and dried for later use.

[0063] (3) Add 0.1142 g of methyl p-hydroxybenzoate (MP) and 0.2583 g of methacrylic acid (MAA) into ...

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PUM

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Abstract

The invention provides a preparation method of mythyl p-hydroxybenzoate molecular imprinting composite membrane and application thereof. A molecular imprinting composite preparation method and an application of mythyl p hydroxybenzoate in separation of methyl salicylate belong to the fields of material preparation technology and separating technology. polyvinylidene fluoride micro filter membrane is used as a substrate, and mythyl p-hydroxybenzoate (MP) which is impurity in methyl salicylate is used as a template molecule, and methacrylic acid (MAA) is used as a functional monomer, and N, N'-methylene bisacrylamide (MPAA) is used as a cross-linking agent, and azodiisobutyronitrile (AIBN) is used as an initiator; preparation of mythyl p-hydroxybenzoate molecular blotting membrane (MIMMP), static adsorption experiment and selective penetration experiment are used for researching selective identification property of the preparative molecular imprinting membrane. The result shows that, according to the invention, the obtained mythyl p-hydroxybenzoate molecular imprinting composite membrane has super mythyl p-hydroxybenzoate molecule identification performance.

Description

technical field [0001] The present invention relates to a preparation method of grafting imprinted polymer on polyvinylidene fluoride microporous filter membrane, in particular to a preparation method of methyl p-hydroxybenzoate molecularly imprinted composite membrane, and its application in removal of Impurity-methyl p-hydroxybenzoate belongs to the technical field of material preparation and separation. Background technique [0002] Wintergreen oil, scientific name methyl salicylate, has a wintergreen aroma and was first extracted from the wintergreen plant in 1834. Mainly used in beverages, food, toothpaste and cosmetics, such as daily flavors of tuberose and acacia, food flavors of strawberries and grapes, and also used in insecticides, fungicides, analgesics, benevolent agents and Solvents and intermediates for paints, etc. Due to the limited source of natural methyl salicylate, it is usually obtained from the esterification reaction of salicylic acid and methanol. S...

Claims

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Application Information

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IPC IPC(8): C08J7/16C08J9/26C08L51/00C08F259/08C08F222/38C08F220/06B01D71/78B01D69/12B01D67/00
Inventor 张敏孟敏佳季燕军李春香闫永胜
Owner JIANGSU UNIV
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