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Monoalkyl/dialkyl sodium benzenesulfonate synthesis method

A technology of sodium alkylbenzene sulfonate and synthesis method, which is applied in the field of surfactant synthesis and application, can solve environmental pollution and other problems, and achieve the effects of low equipment requirements, good emulsifying performance and wetting performance, and easy separation

Active Publication Date: 2020-01-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic liquid catalyst used is mild and efficient, easy to separate from the product, and overcomes the shortcomings of traditional alkylation catalysts such as polluting the environment, strong toxicity and strong corrosion

Method used

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  • Monoalkyl/dialkyl sodium benzenesulfonate synthesis method
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  • Monoalkyl/dialkyl sodium benzenesulfonate synthesis method

Examples

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Embodiment 1

[0030] The synthesis of a kind of sodium monoalkylbenzene sulfonate in the present embodiment, described synthesis step comprises the following aspects:

[0031] A fixed amount of triethylamine hydrochloride (1.8 mmol), n-decane (5.34 g) and anhydrous aluminum chloride (3.6 mmol) were added to a 100 mL three-necked flask equipped with a reflux condenser, and heated under an argon atmosphere for 60 °C and stirred for 1 h. After the stirring was stopped, the mixture was separated into layers, the upper layer was n-decane, and the lower layer was [Et 3 NH + ][Al 2 Cl 7 - ] Composed of ionic liquid catalysts. According to the molar ratio of benzene:1-hexene being 14:1, benzene was first added to the ionic liquid, and the required 1-hexene was slowly added dropwise under stirring at 60°C. After the alkylation reaction is completed, the mixture is cooled to room temperature and separated into layers. The upper layer is n-decane, alkylbenzene products and unreacted substances, ...

Embodiment 2

[0035] The synthesis of a kind of sodium dialkylbenzene sulfonate in the present embodiment, described synthesis step comprises the following aspects:

[0036] A fixed amount of triethylamine hydrochloride (1.8 mmol), n-decane (5.34 g) and anhydrous aluminum chloride (3.6 mmol) were added to a 100 mL three-necked flask equipped with a reflux condenser, and heated under an argon atmosphere for 60 °C and stirred for 1 h. After the stirring was stopped, the mixture was separated into layers, the upper layer was n-decane, and the lower layer was [Et 3 NH + ][Al 2 Cl 7 - ] Composed of ionic liquid catalysts. According to the molar ratio of benzene:1-hexene being 1:6, benzene was first added to the ionic liquid, and the required 1-hexene was slowly added dropwise under stirring at 60°C. After the alkylation reaction is completed, the mixture is cooled to room temperature and separated into layers. The upper layer is n-decane, alkylbenzene products and unreacted substances, and...

Embodiment 3

[0040] The synthesis of a kind of sodium monoalkylbenzene sulfonate in the present embodiment, described synthesis step comprises the following aspects:

[0041] A fixed amount of triethylamine hydrochloride (1.5 mmol), n-decane (5.34 g) and anhydrous aluminum chloride (3.9 mmol) were added to a 100 mL three-necked flask equipped with a reflux condenser, and heated under an argon atmosphere for 60 °C and stirred for 1 h. After the stirring was stopped, the mixture was separated into layers, the upper layer was n-decane, and the lower layer was [Et 3 NH + ][Al 2 Cl 7 - ] Composed of ionic liquid catalysts. According to the molar ratio of benzene:1-octene being 12:1, benzene was first added to the ionic liquid, and the required 1-octene was slowly added dropwise under stirring at 60°C. After the alkylation reaction is completed, the mixture is cooled to room temperature and separated into layers. The upper layer is n-decane, alkylbenzene products and unreacted substances, ...

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Abstract

The invention discloses a monoalkyl / dialkyl sodium benzenesulfonate synthesis method, wherein a medium-chain alpha-olefin is catalyzed by using an ionic liquid to synthesize alkylbenzene and sulfonate, and the surface properties are researched. According to the invention, alpha-olefin and benzene are used as raw materials and are subjected to alkylation reactions in the presence of acidic ionic liquids to synthesize various surfactant intermediates, the obtained intermediates are used as raw materials and are subjected to sulfonation by using chlorosulfonic acid, and neutralization is performed by using sodium hydroxide to obtain various sodium alkyl benzene sulfonate surfactants; and the obtained surfactant can obviously reduce the surface tension of water, and the emulsifying property and the wettability of the surfactant are obviously superior to the emulsifying property and the wettability of sodium dodecyl benzene sulfonate.

Description

technical field [0001] The invention relates to a method for synthesizing mono / dialkylbenzene sulfonate sodium, which belongs to the field of surfactant synthesis and application. Background technique [0002] Fischer-Tropsch synthesis (FTS) is the conversion of coal-to-synthesis gas into clean liquid fuels, and is one of the most efficient ways to utilize coal resources. It is well known that α-olefins (C 5 -C 11 ) is higher in FTS products. However, these α-olefins are generally used as liquid fuels with low added value. Therefore, it is necessary and valuable to increase the high value-added utilization of α-olefins through various channels. [0003] Linear alkylbenzene sulfonates are important surfactants widely used in industrial and consumer products. It is well known that their synthesis is usually via long-chain alkenes (C 10 -C 14 ) at HF ​​and H 2 SO 4 Alkylation of benzene over acidic catalysts. However, these catalysts also bring serious environmental ...

Claims

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Application Information

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IPC IPC(8): C07C303/32C07C303/08C07C309/31C07C2/70C07C15/107C07C15/113
CPCC07C303/32C07C303/08C07C2/70C07C309/31C07C15/107C07C15/113
Inventor 刘雷孔闪闪董晋湘
Owner TAIYUAN UNIV OF TECH
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