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Method for synthesizing 2-isopropylnaphthalene

A technology of isopropylnaphthalene and alkylation reagent, which is applied in the field of synthesizing 2-isopropylnaphthalene, can solve the problems of low conversion rate of raw materials and low selectivity of 2-isopropylnaphthalene, so as to improve catalytic efficiency, simplify The effect of precise control of process flow, reaction temperature and time

Active Publication Date: 2020-04-21
南京擎宇生物医药科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of low conversion rate of raw materials and low selectivity of synthesized 2-isopropylnaphthalene in the existing method for synthesizing 2-isopropylnaphthalene, the present invention provides a method for synthesizing 2-isopropylnaphthalene, in which three streams of materials enter simultaneously Continuous flow microchannel reactor, avoiding the use of organic solvents, can precisely control the process reaction conditions to ensure the conversion of reaction materials, the conversion rate of naphthalene is 100%, and the selectivity of 2-isopropylnaphthalene is over 98%.

Method used

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  • Method for synthesizing 2-isopropylnaphthalene
  • Method for synthesizing 2-isopropylnaphthalene
  • Method for synthesizing 2-isopropylnaphthalene

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Embodiment 1

[0042] Such as figure 1 As shown, the device for synthesizing styrenated phenol in this embodiment includes preheating pipe, metering pump, microreactor (continuous flow microchannel reactor), and the microchannel cross-sectional equivalent diameter of microreactor in this embodiment is 0.5mm , the microchannel tube length is 100m.

[0043] The steps of synthesizing styrenated phenol in the present embodiment are as follows:

[0044] (1) Naphthalene is heated to 90 DEG C and kept warm by a preheater as fluid A; 2-bromopropane is used as fluid B at normal temperature; triethylamine heptachlorodialuminate ionic liquid is used as fluid C at normal temperature; wherein, The molar ratio of naphthalene: 2-bromopropane: chloroaluminate ionic liquid is 1: 1.04: 0.6;

[0045] The volume flow rate of naphthalene is controlled by a metering pump to be 2.5ml / min, the volume flow rate of 2-bromopropane is 2.0ml / min and the volume flow rate of chloroaluminate ionic liquid catalyst is 3ml / ...

Embodiment 2

[0050] Such as figure 1 As shown, the device for synthesizing styrenated phenol in this embodiment includes preheating pipe, metering pump, microreactor (continuous flow microchannel reactor), and the microchannel cross-sectional equivalent diameter of microreactor in this embodiment is 0.6mm , the microchannel tube length is 120m.

[0051] The steps of synthesizing styrenated phenol in the present embodiment are as follows:

[0052] (1) Naphthalene is heated to 95 DEG C and kept warm by a preheater as fluid A; 2-bromopropane is used as fluid B at normal temperature; triethylamine heptachlorodialuminate ionic liquid is used as fluid C at normal temperature; wherein, The molar ratio of naphthalene: 2-bromopropane: chloroaluminate ionic liquid is 1: 1.04: 1.2;

[0053] The volume flow rate of naphthalene is 3ml / min, the volume flow rate of 2-bromopropane is 2.3ml / min, and the volume flow rate of chloroaluminate ionic liquid catalyst is 6ml / min through the metering pump, and th...

Embodiment 3

[0056] Such as figure 1 As shown, the device for synthesizing styrenated phenol in this embodiment includes preheating pipe, metering pump, microreactor (continuous flow microchannel reactor), and the microchannel cross-sectional equivalent diameter of microreactor in this embodiment is 0.8mm , the microchannel tube length is 150m.

[0057] The steps of synthesizing styrenated phenol in the present embodiment are as follows:

[0058] (1) Naphthalene is heated to 90 DEG C and kept warm by a preheater as fluid A; 2-bromopropane is used as fluid B at normal temperature; triethylamine heptachlorodialuminate ionic liquid is used as fluid C at normal temperature; wherein, The molar ratio of naphthalene: 2-bromopropane: chloroaluminate ionic liquid is 1: 1.04: 1.8;

[0059] The volume flow rate of naphthalene is controlled by a metering pump to be 3.5ml / min, the volume flow rate of 2-bromopropane is 2.7ml / min and the volume flow rate of chloroaluminate ionic liquid catalyst is 9ml / ...

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Abstract

The invention discloses a method for synthesizing 2-isopropylnaphthalene, and belongs to the technical field of organic synthesis application. Naphthalene is preheated to serve as a fluid A, an alkylation reagent serves as a fluid B, a chloroaluminate ionic liquid serves as a fluid C, and the three fluids are synchronously fed into a micro-reactor; the fluids A, B and C react in the micro-reactoraccording to a certain molar ratio at a controlled flow rate, and the 2-isopropylnaphthalene product is obtained after a discharged liquid is treated. The method is simple and convenient to operate, does not use an organic solvent, and is safe, controllable and environment-friendly in process, the catalyst is easy to separate, the naphthalene conversion rate is 100%, the selectivity of the product2-isopropylnaphthalene is 98% or above, and the 2-isopropylnaphthalene product can be continuously produced.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis applications, and more specifically relates to a method for synthesizing 2-isopropylnaphthalene. Background technique [0002] In my country, tar naphthalene is mainly extracted from coal tar (the annual production capacity is about 15 million tons, of which naphthalene accounts for about 10-12%). In 2009, the annual production capacity of industrial naphthalene reached 200,000 tons, and the annual output of refined naphthalene reached 100,000 tons. It is very important to develop downstream high value-added products of naphthalene. [0003] A bicyclic aromatic hydrocarbon with an alkyl group attached to the naphthalene ring is called monoalkylnaphthalene, which is an important chemical raw material or an organic synthesis intermediate. Among them, β-isopropylnaphthalene is the raw material for synthesizing β-naphthol, and there are more than 20 kinds of dye intermediates directly synt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C15/24
CPCC07C2/861C07C2/864C07C15/24
Inventor 陆林华蔡显刚范文娟袁杰鲁陈琳秦敦忠
Owner 南京擎宇生物医药科技有限公司
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