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Application of continuous microwave reactor

A reaction equipment and microwave technology are applied in the field of microwave continuous reaction equipment to prepare ionic liquids, which can solve the problems of inability to large-scale industrial production of ionic liquids, difficulty in ensuring product purity, and high solubility of methylimidazole, achieving simple structure and saving operation. Steps, low-cost effects

Inactive Publication Date: 2008-12-17
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems in this patent: 1. Methylimidazole is unstable at 170°C and easy to decompose
2. A small amount of ethyl acetate is difficult to achieve the purpose of purification, the solubility of methylimidazole in the product is still very large, and the purity of the product is difficult to guarantee
This system also needs to control the stability by stopping the microwave irradiation, which is an intermittent reaction; and it is expensive, and cannot produce ionic liquids on a large scale
[0011] At present, the synthesis of ionic liquids uses microwave technology, mainly using microwave batch reactors, and the processing capacity is very small and the operation is cumbersome, while microwave continuous reactors can overcome the above Insufficient, but there are no reports at home and abroad on the use of microwave continuous reaction equipment to synthesize ionic liquids

Method used

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  • Application of continuous microwave reactor
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  • Application of continuous microwave reactor

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0054] Example 1 New microwave continuous reaction equipment

[0055] A kind of novel microwave continuous reaction equipment of the present invention, as figure 1 As shown: it includes a reactant mixer 1, a magnetic stirrer 2, a constant flow pump 3, a microwave cavity 4, a reactor 5, a cooling device 6, a product separation device 7, a product collection device 8, a feed pipe 9, Outlet pipe 10, side pipe 11, top pipe 12, condensate inflow pipe 13, condensate outflow pipe 14, reactor bracket 15, microwave emission source 16, glass container 17, iron stand 18, microwave oven 19, stirrer 20 , feed funnel 21, side hole 22, top hole 23, condensate outflow port 24, condensate inflow port 25, feed port 26, discharge port 27, rubber plug I 28, pump head 29, rubber plug II 30 and Material prevention valve 31.

[0056] The microwave oven 19 of the present invention is Haier's new type converter MF-2070EGZ; the microwave cavity cavity 4 is the microwave cavity cavity of the microwave...

Embodiment 2

[0064] Example 2 Preparation of ionic liquid 1-hexyl-3-methylimidazolium bromide with microwave continuous reaction equipment of the present invention

[0065] Take 79ml (1mol) of 1-methylimidazole and 139ml (1mol) of 1-bromohexane and mix them, flow them into a 250ml three-necked bottle through the feeding funnel, stir evenly, and flow into the reactor through the feeding pipe under the drive of the constant flow pump Medium (microwave power is 280W). Adjust the flow rate of the magnetic stirrer to make it stir evenly, adjust the flow rate of the constant flow pump (adjust the value of the constant flow pump to 1.0, and the flow rate is 1.86ml.s -1 ), the flow time of the reaction materials in the reactor is 2.5 minutes, and water is passed into the cooling device for heat exchange to achieve a controlled reaction temperature of 60-65°C. Driven by the constant flow pump, the reactant material flows into the separatory funnel from the reactor through the discharge pipe, and t...

Embodiment 3

[0072] Example 3 Preparation of ionic liquid ionic liquid 1-octyl-3-methylimidazolium chloride salt with microwave continuous reaction equipment of the present invention

[0073] Take 79ml (1mol) of 1-methylimidazole and 170ml (1mol) of 1-chlorooctane and mix them, flow them into a 250ml three-neck bottle through the feeding funnel, stir evenly, and flow into the reactor through the feeding pipe under the drive of the constant flow pump Medium (microwave power is 420W). Adjust the flow rate of the magnetic stirrer to make it stir evenly, adjust the flow rate of the constant flow pump (adjust the value of the constant flow pump to 0.5, and the flow rate is 0.67ml.s -1 ), the flow time of the reaction materials in the reactor is 3 minutes, and water is passed into the cooling device for heat exchange to achieve a controlled reaction temperature of 65-70°C. Driven by the constant flow pump, the reactant material flows into the separatory funnel from the reactor through the disch...

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Abstract

The present invention is the application of continuous microwave reactor in preparing ionic liquid. The continuous microwave reactor developed based on household microwave oven is applied in preparing ionic liquid in the general expression of A+B-, where, A+ is organic cation, B- is inorganic anion. The ionic liquid has smelting point at 1 atm (101.325kPa) lower than 100 deg.c. The continuous microwave reactor has high reaction rate of preparing ionic liquid, 10-1000 times higher than conventional process, and the continuous process results in effectively lowered cost.

Description

technical field [0001] The invention relates to a microwave continuous reaction equipment used for preparing ionic liquid. technical background technical background [0002] Chemical reactions often require heating or high temperature and high pressure. Most of the previous heating methods use heat conduction and heat convection. These heating methods conduct heat from the outside to the inside of the reactor, and the heating speed is slow, and the external temperature of the reaction system is higher than the internal temperature. The temperature and uneven heating lead to unsatisfactory reaction yield and selectivity, and it is difficult to meet the requirements of certain chemical reactions. Microwaves can directly irradiate each molecule in the reaction mixture, including solvents, reaction materials and catalysts, and the reaction vessel is made of materials such as borosilicate, quartz, and polytetrafluoroethylene that do not absorb microwaves. In this way, the ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/12
Inventor 陈继胡旭刘郁
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES