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Process description of 1,4-Dimethoxybenzene(cas 150-78-7)

Date : 2016/8/23 11:59:28

1,4-Dimethoxybenzene(cas 150-78-7) naturally present in green tea, peppermint oil and papaya, relative density: 1.0526, turning in an organic solvent or the like alcohol, ether and benzene, slightly soluble in water, has an aromatic odor; terephthalic dimethyl ether is a more common organic chemicals, commonly used in perfumes, chemicals , food, tobacco and other synthetic flavors and preparation, but also for plastics and synthetic paint anti-erosion agent and a number of dyes and pharmaceutical intermediates, such as for 2,5 and 2,5-dimethoxy aniline synthesis methoxyacetophenone can also be used to produce pharmaceutical methoxyamine hydrochloride, and so the black dye salt ANS.

At present, there are two synthesis routes of 1,4-dimethoxybenzene(cas 150-78-7): atmospheric dimethyl sulfate methylation and methylation of halogenated methane pressurized, dimethyl sulfate methylation line pressure is starting to hydroquinone starting material, with a strong base in alkaline medium with a salt and then substituted by dimethyl sulfate, the process yields higher product quality and stability, mild reaction conditions, but the materials used dimethyl sulfate is highly toxic products , higher prices, and dimethyl sulfate methylation utilization rate of only 50% after a single form sulfuric acid ester salt remaining a methyl group is no longer involved in the reaction, so the higher the consumption of dimethyl sulfate, not only increased production costs, but also increases the difficulty of wastewater treatment; raw material costs due to the reasons halogenated methane pressurized methylation technology used halogen

on behalf of the alkyl is inexpensive and readily available methyl chloride, and hydroquinone in a strong alkaline medium under pressure in the reaction, the process used a cheaper raw material prices chloride, but the reaction needs to be under pressure, investment in equipment high, and low reaction yield, total production cost is still high; more than two process there is a common drawback is still present in the product section monomethyl product hydroxyanisole, subject to further refining in order to obtain high levels of 1,4-dimethoxybenzene(cas 150-78-7).