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A method for regulating the krafft temperature of surfactant by adjusting ph method

A surfactant and aqueous solution technology, applied in chemical instruments and methods, transportation and packaging, organic chemistry, etc., can solve the problem of irreversible regulation of Krafft temperature, and achieve the effect of broadening the scope of use, easy promotion, and easy recycling.

Active Publication Date: 2020-10-09
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For the problems existing in the prior art, the invention provides a kind of method of regulating the Krafft temperature of tensio-active agent, the present invention can be by utilizing the method for regulating the Krafft temperature of tensio-active agent by adjusting pH method, and this has just solved traditional surface The problem that the Krafft temperature of the active agent cannot be reversibly regulated

Method used

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  • A method for regulating the krafft temperature of surfactant by adjusting ph method
  • A method for regulating the krafft temperature of surfactant by adjusting ph method
  • A method for regulating the krafft temperature of surfactant by adjusting ph method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation method of alkyl selenopropyl sulfonate, the steps are as follows:

[0049] (1) Synthesis of dodecyl diselenide: Weigh 10.0 g of selenium powder and place it in a 500 ml three-necked round-bottomed flask. Under nitrogen protection, add 75 ml of tetrahydrofuran and stir at room temperature for 10 minutes, then add 6.59 g of 75 ml The sodium hydroxide dispersed in tetrahydrofuran was placed in a 500 ml three-necked flask, stirred for 10 minutes, then 2.98 g (85% effective content) of hydrazine hydrate was weighed, dispersed with 50 ml tetrahydrofuran, and added to a 500 ml three-necked flask. After reacting for 30 minutes, 34.72 g of brominated alkanes were weighed, dispersed by adding 75 ml of tetrahydrofuran, and then transferred to a 500 ml three-neck flask. Reaction at room temperature for 8h, the crude product was obtained. The insoluble matter was removed by filtration, the solvent was evaporated to dryness, and then extracted with dichloromethane, a...

Embodiment 2

[0052] Embodiment 2 regulates the Krafft temperature of surfactant alkyl selenopropyl sulfonate

[0053] Taking 3-dodecylselenium-1-propanesulfonate sodium as an example, its Krafft temperature is regulated by adding acid-oxidation and reduction-adding alkali:

[0054] (1) Prepare 10.000 grams of 3-dodecylselenium-1-propane sodium sulfonate aqueous solution with a mass fraction of 1%, place it at 4°C for 24 hours, and then gradually increase the temperature by slowly raising the temperature Temperature, to make it completely dissolve, record the temperature at this time as the Krafft temperature, and its value is 43.4±0.4°C;

[0055] (2) Weigh 0.5 gram of sodium dodecylselenium-1-propanesulfonate, then add 0.565 gram of N,N-dimethylethanolamine, then add deionized water to a total mass of 50.000 grams, record The pH at this moment is 10.36, adopts the method in (1) to measure its Krafft temperature, and its value is 40.2 ± 0.4 ℃;

[0056] (3) Weigh 0.5 gram of sodium dodecyl...

Embodiment 3

[0062] Taking sodium 3-hexadecylselenium-1-propanesulfonate as an example, adjust its Krafft temperature.

[0063] (1) Prepare 10.000 grams of an aqueous solution of 3-hexadecylselenium-1-propanesulfonate sodium solution with a mass fraction of 1%, place it at 4°C for 24 hours, and then gradually increase the temperature by slowly raising the temperature Temperature, to make it completely dissolve, record the temperature at this time as the Krafft temperature, and its value is 60.1±0.4°C;

[0064] (2) Weigh 0.5 g of sodium 3-hexadecylselenium-1-propanesulfonate, then add 0.323 g of N,N,N,N-tetramethylethylenediamine, and then add deionized water to the total The mass is 50.000 grams, and the pH recorded at this time is 10.57. The Krafft temperature is measured by the method in (1), and its value is 55.3±0.4°C;

[0065] (3) Regulate its Krafft temperature by adding acid: weigh 0.5 gram of 3-hexadecylselenium-1-propanesulfonate sodium, then add 0.323 gram of N,N,N,N-tetramethyl...

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Abstract

The invention discloses a method for adjusting the Krafft temperature of a surfactant by using a pH adjusting method, and belongs to the technical field of daily chemical industry. The present invention is achieved by the following methods: preparing an aqueous solution of surfactant, and adjusting the pH of the surfactant to 1-6 by adding acid to reduce the Krafft temperature of the surfactant; or, adjusting the pH of the surfactant to 10-11 by adding an alkali to restore or improve Krafft temperature of surfactants. The method for regulating the Krafft temperature of the surfactant provided by the present invention can regulate the increase or decrease of the Krafft temperature according to the actual use situation, and the reversibility is good, especially when CO is used 2 / N 2 When the Krafft temperature of the surfactant is adjusted by the method, it can be recycled for multiple times and has little influence on the Krafft temperature of the surfactant itself; the method of the invention is simple and easy to operate, green and environmentally friendly, and easy to popularize.

Description

technical field [0001] The invention relates to a method for adjusting and controlling the Krafft temperature of a surfactant by adjusting pH, and belongs to the technical field of daily chemical industry. Background technique [0002] The solubility of ionic surfactants in water changes with temperature. When the temperature rises to a certain point, the solubility of surfactants increases sharply. This temperature is called the Krafft temperature. [0003] Krafft temperature is a very important property of ionic surfactants. Below the Krafft temperature, the solubility of ionic surfactants is greatly limited. Correspondingly, various properties of surfactants on the surface / interface cannot be achieved. Being brought into play, such as reducing the surface / interfacial tension of water, foaming, etc. can not be played well. When the temperature rises above its Krafft temperature, the solubility of the surfactant is greatly improved, that is, the dissolution temperature of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F17/00C07C391/00C09K23/00
CPCC07C391/00C09K23/00
Inventor 刘雪锋蔡爽
Owner JIANGNAN UNIV
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