A kind of method of synthesizing 2-isopropylnaphthalene

A technology of isopropylnaphthalene and an alkylating agent, applied in the field of synthesizing 2-isopropylnaphthalene, can solve the problems of low selectivity of 2-isopropylnaphthalene, low conversion rate of raw materials, etc., so as to improve catalytic efficiency and simplify Process flow, guaranteed conversion and selectivity effects

Active Publication Date: 2022-08-02
南京擎宇生物医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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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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  • A kind of method of synthesizing 2-isopropylnaphthalene
  • A kind of method of synthesizing 2-isopropylnaphthalene
  • A kind of method of synthesizing 2-isopropylnaphthalene

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Embodiment 1

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

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

[0044] (1) naphthalene is heated to 90 ℃ by preheater and kept warm, 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 the metering pump to be 2.5ml / min, the volume flow rate of 2-bromopropane is 2.0ml / min and the volume flow rate of the chloroaluminate ionic liquid catalys...

Embodiment 2

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

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

[0052] (1) naphthalene is heated to 95 ℃ by a preheater and kept warm 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 controlled by a metering pump to be 3ml / min, the volume flow rate of 2-bromopropane is 2.3ml / min, and the volume flow rate of chloroaluminate ionic liquid catalyst is ...

Embodiment 3

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

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

[0058] (1) naphthalene is heated to 90 ℃ by preheater and kept warm, 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 was controlled by a metering pump to be 3.5ml / min, the volume flow rate of 2-bromopropane was 2.7ml / min, and the volume flow rate of the chloroaluminate ionic liquid cata...

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Abstract

The invention discloses a method for synthesizing 2-isopropylnaphthalene, and belongs to the technical field of organic synthesis applications. Naphthalene is preheated as fluid A, alkylating agent as fluid B, and chloroaluminate ionic liquid as fluid C, and the three fluids are sent into the microreactor synchronously; The reaction is carried out in the microreactor, and the 2-isopropylnaphthalene product is obtained after the effluent liquid is processed. The method is easy to operate, does not use organic solvents, the process is safe, controllable and environmentally friendly, the catalyst is easy to separate, the conversion rate of naphthalene is 100%, the selectivity of the product 2-isopropylnaphthalene is more than 98%, and the 2-isopropylnaphthalene product can be continuously produced .

Description

technical field [0001] The invention belongs to the technical field of organic synthesis application, and more particularly relates to a method for synthesizing 2-isopropylnaphthalene. Background technique [0002] In my country, tar naphthalene is mainly extracted from coal tar (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 has reached 200,000 tons, and the annual output of refined naphthalene can reach 100,000 tons. It has become very important to develop downstream high value-added products of naphthalene. [0003] The bicyclic aromatic hydrocarbon with an alkyl group attached to the naphthalene ring is called monoalkylnaphthalene, which is an important chemical raw material or an intermediate in organic synthesis. Among them, β-isopropylnaphthalene is the raw material for the synthesis of β-naphthol, and there are more than 20 kinds of dye intermedi...

Claims

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Application Information

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Patent Type & Authority Patents(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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