Method for preparing propylene glycol ether

Abstract

The invention relates to a propylene glycol ether preparation method, mainly solving the shortcomings that catalyst of the prior art has low stability and imperfect products yield and isomers proportion. The invention adopts epoxy propane and higher fatty alcohol as materials, adopts niobium oxide as a main activated component, and chooses at least one of elements or oxides of Ge, Sn, Pb, P or S as auxiliary agent to form the catalyst, to prepare propylene glycol ether under the temperature of 100 to 300 DEG C, reaction pressure 1.0 to 3.0MPa, lower fatty alcohol / epoxy propane ratio 1-10: 1,liquid space velocity 1.0 to 4.0 hour<-1>. The technical proposal can well solve the problem, and has epoxy propane conversion rate higher than 98 percent, propylene glycol ether selectivity higher than 95 percent, and isomers proportions higher than 95: 5. The method of the invention can achieve comparatively high product yield and isomers proportion, and has the advantages of small energy consumption, low production cost, environmental protection and free of device corrosion, and can be used for industrial production of the propylene glycol ether.

Description

The preparation method of propylene glycol ether technical field The invention relates to a method for preparing propylene glycol ether, in particular to a method for preparing propylene glycol ether by reacting propylene oxide and low-carbon fatty alcohol. Background technique Propylene glycol ether has become one of the advanced solvents in fine chemicals due to its unique chemical structure and dual functions of lipophilicity and hydrophilicity. It is called a universal solvent and is widely used due to its low toxicity. The main varieties are propylene glycol methyl ether (PM), propylene glycol ethyl ether (PE), and propylene glycol butyl ether (PB) series. The synthesis of propylene glycol ether mainly includes the Williamson method, the acetal method, the ethoxypropylene oxide method and the propylene oxide method, among which the propylene oxide method is the most widely and deeply studied, and industrialized production has been realized. There are two main types o...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is the low stability of the catalyst in the prior art, the defect that the product yield and the ratio of isomers cannot reach the ideal state, and a new preparation method of propylene glycol ether is provided, which has the advantages of high catalyst activity, stable Good performance, but also has the advantages of propylene glycol ether selectivity and high isomer ratio

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