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Method for preparing diacetone acrylamide from temperature-controlled phase-change type heteropoly acid ionic liquid catalyst

A technology of diacetone acrylamide and ionic liquid, which is applied in the field of compound preparation, can solve the problems of less acidic group content, complicated process, difficult to reuse, etc., and achieves the effects of improving selectivity, simple process purification, and solving difficult separation.

Active Publication Date: 2019-02-15
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acidic group content in the disclosed phosphotungstic acid ionic liquid structure in this patent is less
[0010] There is no report in the prior art that a heteropolyacid-type ionic liquid catalyst is used in the preparation of diacetone acrylamide. The introduction of this technology is expected to solve the complicated process caused by the use of a large amount of concentrated sulfuric acid in the traditional preparation process of diacetone acrylamide. Serious pollution and other problems, and at the same time solve the problem that heteropolyacid catalysis is difficult to reuse;

Method used

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  • Method for preparing diacetone acrylamide from temperature-controlled phase-change type heteropoly acid ionic liquid catalyst
  • Method for preparing diacetone acrylamide from temperature-controlled phase-change type heteropoly acid ionic liquid catalyst
  • Method for preparing diacetone acrylamide from temperature-controlled phase-change type heteropoly acid ionic liquid catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of temperature-controlled phosphotungstic acid ionic liquid catalyst:

[0052] (1) Dissolve 30mmol of polyethylene glycol with molecular weight n=15 in toluene to make a polyethylene glycol solution, which is designated as solution 1; dissolve 60mmol of thionyl chloride and 60mmol of pyridine in toluene to make a solution, which is designated as Solution 2. Slowly add solution 1 dropwise to solution 2 under nitrogen atmosphere, and react at 70°C for 3 hours. After the reaction is completed, the solid is obtained by suction filtration, and washed with a small amount of sodium bicarbonate to neutralize the generated acidic substance. Compound 2 is obtained after suction filtration. Weighing 21.7g, the yield of this step is 90%.

[0053] (2) Dissolve 25mmol of compound 2 and 60mmol of nitrogen methyl imidazole in acetonitrile and react at 70°C for 24h. After rotary evaporation, compound 3 was obtained and weighed to obtain 20.4g. The yield of this step was 84%...

Embodiment 2

[0057] Weigh 0.3mol of acrylamide and 3mol of mesityl oxide, pour them into a three-necked flask, stir evenly, then weigh about 8mmol of phosphotungstic acid ionic liquid catalyst and pour them into the flask, and add 1.6mmol of potassium phosphotungstate solid to the flask Put it in an oil bath at 70°C, react for 6 hours, stop the reaction, wait for the reaction liquid to cool below 20°C and filter to separate the solid potassium phosphotungstate, separate the liquid phase after standing still, take the upper liquid for liquid chromatography analysis, and calculate Yield and selectivity, the results are shown in Table 1. The analytical instrument is WatersH-class produced by Waters Corporation, the chromatographic column is HSST3 (4.6×250mm) 5 μm, the mobile phase is acetonitrile / water, and the gradient elution method is adopted, the column temperature is 40 °C, and the flow rate of the mobile phase is 1.0ml / min. The detector is a PDA detector. Subsequent purification is car...

Embodiment 3

[0068] Weigh 0.1mol acrylamide and 1.1mol mesityl oxide, pour into a three-necked flask and stir evenly, then weigh 5.4mmol phosphotungstic acid ionic liquid catalyst and pour it into the flask, add 1.2mmol ammonium phosphotungstate, put the flask Put it into a 70°C oil bath, react for 6 hours, stop the reaction, and filter out the solid ammonium phosphotungstate after the reaction liquid is cooled to below 20°C. rate and selectivity. After washing and drying the catalyst in the lower layer repeatedly with acetone, the recovery rate was calculated after weighing and used for the next reaction. The reaction step of Example 3 was repeated five times, wherein the reacted catalyst was repeatedly used 5 times. Diacetone acrylamide yield and selectivity and catalyst recovery calculation method are with embodiment 2.

[0069] According to above-mentioned embodiment operation, the rate of recovery of catalytic effect and catalyst is shown in the following table:

[0070] Table 2

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Abstract

The invention relates to a method for preparing diacetone acrylamide from a temperature-controlled phase-change type heteropoly acid ionic liquid catalyst. In the method, mesityl oxide and acrylamideare taken as raw materials, temperature-controlled phase-change type heteropoly acid ionic liquid is used as a catalyst, phosphotungstate is added as an auxiliary gent, the selectivity of the productcan be improved remarkably, and the problem that a traditional homogeneous heteropoly acid catalyst is not easy to separate and reuse is solved by the characteristics of 'phase homogenizing at a hightemperature and phase splitting at a low temperature' of the disclosed ionic liquid.

Description

technical field [0001] The invention belongs to the technical field of compound preparation, and in particular relates to a method for preparing diacetone acrylamide by using a temperature-controlled phase transition type heteropolyacid ionic liquid catalyst. Background technique [0002] Diacetone acrylamide, referred to as DAAM, has the following structural formula: [0003] [0004] Its structure contains three reactive groups, which can carry out reactions such as cross-linking reaction, aldol condensation double bond polymerization, etc. It is widely used, mainly used in water-based coatings, adhesives, epoxy resin curing agents, photosensitive resin additives, It is an important vinyl monomer in aspects such as perm fixative and unsaturated resin crosslinking agent. [0005] The traditional production method of diacetone acrylamide is prepared by reacting acetone or diacetone alcohol and acrylonitrile under the catalysis of concentrated sulfuric acid. This process...

Claims

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Application Information

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IPC IPC(8): B01J31/18B01J27/188B01J31/26C07C231/12C07C233/31
CPCB01J27/188B01J31/0285B01J31/0298B01J31/068B01J31/26C07C231/12C07C233/31
Inventor 边路路何岩周锐田博王庆义董龙跃姜庆梅孙启魁
Owner WANHUA CHEM GRP CO LTD
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