Method for preparing 2-(4-methoxy phenoxy) propionic acids
A technology of oxyphenoxy and propionic acid, which is applied in the field of preparation of herbicide intermediates, can solve the problems of high cost, time-consuming, troublesome intermediate treatment, etc., and achieve the effect of low cost, less pollution and simple operation
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[0031] In order to further illustrate the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.
[0032] The purity of hydroquinone, methyl S-2-chloropropionate and sodium hydroxide used in this example are all ≥99%, and the purity of hydrochloric acid is ≥30%.
[0033] A kind of preparation method of 2-(4-oxyphenoxy group) propionic acid, comprises the following steps (such as figure 1 shown):
[0034] (1), prepare raw materials according to 183kg of hydroquinone, 202.5kg of S-2-methyl chloropropionate, 210kg of sodium hydroxide and 426kg of hydrochloric acid;
[0035] (2) Add 183kg of hydroquinone and 202.5kg of methyl S-2-chloropropionate into the reaction kettle all at once, add 100kg of so...
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