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Method for continuously preparing dodecyl benzene

A dodecylbenzene, high-efficiency technology, applied in the field of continuous preparation of dodecylbenzene, can solve the problems of solid acid catalyst deactivation, affecting production efficiency, easy coverage, etc., achieve rapid and uniform mixing process, and stable product quality , good quality effect

Inactive Publication Date: 2019-09-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the solid acid catalyst has a certain catalytic activity and selectivity for this reaction, when it is used as a catalyst, the reaction needs to be carried out at a higher temperature, and the energy consumption is higher; at the same time, because the material needs to diffuse in the pore structure before and after the reaction, the process The by-products produced in the process easily cover the active centers on the surface, and carbon deposition occurs, so that the solid acid catalyst is easily deactivated during the reaction, and it needs to be regenerated repeatedly, which affects its production efficiency

Method used

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  • Method for continuously preparing dodecyl benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] as per figure 1 The process shown is continuous preparation of dodecylbenzene:

[0037] (1) Preparation of ionic liquid A: Weigh 20.0g of trimethylamine hydrochloride in a container, heat to a constant temperature of 80°C; weigh 55.8g of aluminum chloride, and add chloride chloride in batches to trimethylamine hydrochloride while stirring. Aluminum, after adding all the aluminum chloride, continue to stir at constant temperature for 1 hour, and cool to room temperature to obtain a dark reddish brown liquid with a density of about 1.2-1.4, which is the catalyst ionic liquid A.

[0038] (2) Feed benzene and 1-dodecene into micro-mixer a at flow rates of 2 ml / min and 0.6 ml / min respectively, and mix quickly and uniformly to prepare benzene raw material liquid B.

[0039] (3) The ionic liquid A obtained in the step (1) and the raw material solution B obtained in the step (2) are continuously passed into the micro-mixer b at flow rates of 0.5 ml / min and 2.5 ml / min respectiv...

Embodiment 2

[0042] as per figure 1 The process shown is continuous preparation of dodecylbenzene:

[0043] (1) Preparation of ionic liquid A: Weigh 20.0g of trimethylamine hydrochloride in a container, heat to a constant temperature of 80°C; weigh 55.8g of aluminum chloride, and add chloride chloride in batches to trimethylamine hydrochloride while stirring. Aluminum, after adding all the aluminum chloride, continue to stir at constant temperature for 1 hour, and cool to room temperature to obtain a dark reddish brown liquid with a density of about 1.2-1.4, which is the catalyst ionic liquid A.

[0044] (2) Feed benzene and 1-dodecene into micro-mixer a at flow rates of 2 ml / min and 0.6 ml / min respectively, and mix quickly and uniformly to prepare benzene raw material liquid B.

[0045](3) The ionic liquid A obtained in the step (1) and the raw material solution B obtained in the step (2) are continuously passed into the micro-mixer b at flow rates of 0.5 ml / min and 2.5 ml / min respective...

Embodiment 3

[0048] as per figure 1 The process shown is continuous preparation of dodecylbenzene:

[0049] (1) Preparation of ionic liquid A: Weigh 20.0g of trimethylamine hydrochloride in a container, heat to a constant temperature of 80°C; weigh 55.8g of aluminum chloride, and add chloride chloride in batches to trimethylamine hydrochloride while stirring. Aluminum, after adding all the aluminum chloride, continue to stir at constant temperature for 1 hour, and cool to room temperature to obtain a dark reddish brown liquid with a density of about 1.2-1.4, which is the catalyst ionic liquid A.

[0050] (2) Feed benzene and 1-dodecene into the micro-mixer a at flow rates of 3.8ml / min and 1.2ml / min respectively, mix quickly and uniformly to prepare benzene raw material solution B.

[0051] (3) The ionic liquid A obtained in the step (1) and the raw material solution B obtained in the step (2) are continuously passed into the micro-mixer b at a flow rate of 1 ml / min and 5 ml / min respective...

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Abstract

The invention belongs to the technical field of chemical engineering, and relates to a method for continuously preparing dodecyl benzene. The method comprises the following steps that 1, trimethylamine hydrochloride and aluminum chloride are stirred and mixed according to a ratio to prepare an ionic liquid catalyst A; 2, benzene and 1-dodecene are introduced into a micro-mixer a to be quickly and evenly mixed in proportion to obtain a raw material liquid B; 3, a catalyst A and the raw material liquid B are continuously introduced into a micro-mixer b to be rapidly and uniformly mixed to obtain a reaction liquid C, and the reaction liquid C enters a tubular micro-reactor for reaction; 4, the product mixture stands still and is layered, and an ionic liquid A is recycled; 5, an upper layer organic phase obtained in step 4 is rectified to obtain the product dodecyl benzene. The method is environmentally friendly, and can effectively solve the problems of high corrosion, high pollution and the like in a traditional technology. Material flows are rapidly and uniformly mixed, the reaction efficiency is high, the yield of monoalkyl benzene is nearly 100% in a very short time, and the yield of two-position isomer can reach 44% or above; the reaction is conducted in the tubular micro-reactor, the reaction time can be accurately controlled, and the product quality is stable.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an environmentally friendly, highly efficient and controllable method for continuously preparing dodecylbenzene. Background technique [0002] As a high value-added chemical and an important organic synthesis intermediate, dodecylbenzene is widely used in many fields. In industrial production, it is mainly used to manufacture surfactants, plasticizers and various synthetic compounds. Detergent etc. [0003] The current production process mostly adopts the traditional HF process or AlCl 3 The process is highly corrosive and causes serious pollution to the environment. Today, when green environmental protection has become the mainstream development trend of the chemical industry, it is urgent to develop a sustainable process route. Existing research mainly starts from the catalyst to innovate the process, fundamentally solve the pollution and corrosion probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/68C07C15/107B01J31/26
CPCB01J31/26B01J2231/32C07C2/68C07C2531/26C07C15/107Y02P20/52
Inventor 徐建鸿刘恒源刘键
Owner TSINGHUA UNIV
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