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Reaction principle of 1,4-dimethoxybenzene(cas 150-78-7)

Date : 2016/8/17 11:21:03

Preparation of 1,4-dimethoxybenzene(cas 150-78-7):

Taking into account the use of dimethyl sulfate as methylating agent simple operation, less investment in equipment, and product quality and yield stability, the process of the present experiment the problems has been improved, the process is as hydroquinone starting materials, sodium hydroxide is generated in the presence of a strong alkaline medium hydroquinone disodium salt, as the sodium salt formed in aqueous solution, ionized oxygen ions, with a strong power performance, so that the electron density on the benzene ring increase, with a strong pro-nuclear capabilities, and dimethyl sulfate methylation with a certain amount of positive charge, with a strong pro-power capacity, and therefore easy to hydroquinone disodium salt and dimethyl sulfate play a role methylation reaction.

The above reaction can be carried out when conditions are relatively mild, but the dimethyl sulfate utilization of only 50%, and half of the methyl did not participate in the reaction, in order to improve utilization of raw materials, raw material cost savings, take this test to improve response while the temperature in the reaction and distillation of the reaction products and other measures, at the same time since the reaction product is removed continuously, so that the reaction equilibrium has moved, to promote the progress of the reaction, not only the monosodium salt of dimethyl sulphate can continue to participate in the reaction, and hydroquinone disodium utilization also improved the reaction yield improved significantly.

This method is the most important is the use of 1,4-dimethoxybenzene(cas 150-78-7) nature azeotropy with water, while the reaction may be accompanied by steam distillation out together, but not totally involved in the reaction of the sodium salt of p-methoxyphenol not evaporated into the product, high purity of the product thus obtained, without purification, and the product obtained in high purity, while being left in the reaction system methoxyphenol sodium salt may be further reacted t1,4-dimethoxybenzene(cas 150-78-7) improve the reaction yield.