Preparation method for 2-methylquinoline

A technology of methyl quinoline and toluene, applied in the field of chemistry, can solve the problems of high cost, large amount of urea, long reaction time, etc., and achieve the effects of saving energy and time, optimizing reaction conditions and reducing reaction time

CN102372671AInactive Publication Date: 2012-03-14上海煦旻化工科技发展有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-03-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method for 2-methylquinoline. The method comprises the following steps of: dissolving urea into industrial ethanol, and adding raw materials of 2-methylquinoline into a reactor and for reacting with stirring till a white sediment is formed in the reactor; at the end of the reaction, performing filtering or suction filtering on a complex compound; and washing the complex compound with industrial ethanol and / or dimethyl benzene and toluene, and decomposing the complex compound. The method has the advantages: industrial ethanol is taken as a dispersing agent of a reaction instead of toluene or dimethyl benzene, so that the reaction speed is increased, the reaction time is reduced, and a large amount of energy and time are saved.
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Description

technical field

[0001] The invention relates to a method for preparing chemical products in the chemical field, in particular to a method for refining 2-methylquinoline by a urea complexation method. Background technique

[0002] As we all know, the key problem of refining 2-methylquinoline by urea complexation is to strengthen the complexation effect of urea and 2-methylquinoline. In the existing preparation method, toluene is used as a dispersant, and 2-methylquinoline After the raw material is dissolved in toluene, add urea to the 2-methylquinoline toluene solution, the amount added is about 1.5 times the molar number of 2-methylquinoline, react at 80 degrees Celsius for 4 to 5 hours, and filter the complex The substance is put into toluene and heated to self-boiling decomposition, and the toluene solution is distilled to obtain 2-methylquinoline after removing the toluene.

[0003] However, due to the long reaction time and high reaction temperature of the preparation m...

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Embodiment Construction

[0024] The present invention is a method for preparing 2-methylquinoline applied in the field of chemistry, is a major improvement made on the basis of the shortcomings of existing methods for preparing 2-methylquinoline, and has very important practical significance.

[0025] The invention discloses a method for preparing 2-methylquinoline. The specific technical scheme of the present invention will be introduced in detail on the basis of analyzing the principle and disadvantages of the existing method in the order of the preparation process as follows:

[0026] 1. Selection of raw materials

[0027] The raw material of 2-methylquinoline is preferably 2-methylquinoline that has been simply distilled. If the bottom material is used as the raw material, because it contains coking components, an emulsified layer will be produced during subsequent decomposition and stratification, making it difficult to separate. Layer or stratification boundaries are not obvious, affecting the r...