608-25-3Relevant articles and documents
Method for synthesizing M-hydroxyanisole
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Paragraph 0032-0033; 0052-0053; 0056-0057; 0060-0063, (2021/11/03)
The invention provides a method for synthesizing M-hydroxyanisole. Belong to organic synthesis technical field. The synthesis method comprises the following steps: a vapor phase mixture of resorcinol and methanol is subjected to alkylation reaction through a metal phosphate - alumina fixed phase catalyst to obtain m-hydroxyanisole. The method adopts the gas-solid phase alkylation method to synthesize the M-hydroxyanisole without separating the reaction product from the catalyst, has the characteristic of continuous reaction, and can realize continuous production in the industrial production process. The method utilizes the acid-base catalytic activity center on the surface of the stationary phase catalyst to catalyze the reaction of resorcinol and methanol, and has high resorcinol conversion rate. The method has the advantage of high selectivity of m-hydroxyanisole. Methanol is used as a methylation reagent, and the method is environmentally friendly, low in cost and high in economic benefit.
Method for synthesizing 2,6-dihydroxytoluene by using waste acid
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, (2021/08/07)
The invention discloses a method for synthesizing 2,6-dihydroxytoluene by using waste acid mechanically. According to the method, 3-chloro-2-methylaniline is taken as a raw material, an intermediate 3-chloro-2-methylphenol is synthesized through diazotization and hydrolysis, the reaction is optimized in the alkali fusion, acidification and refining processes, the mechanical application of waste acid and a solvent in the reaction and the optimization of a refining scheme are emphatically optimized, the yield is effectively improved, three wastes are reduced, and 2,6-dihydroxytoluene is synthesized. The method provided by the invention greatly reduces the generation of acidic wastewater, better meets the requirement of environmental protection, and effectively increases the yield of the product, and the quality of the product reaches 99.0-99.5%.
Synthesis method of 2,6-dihydroxytoluene
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Paragraph 0047-0049, (2021/11/27)
The invention belongs to the technical field of organic chemical synthesis, and particularly relates to a synthesis method of 2,6-dihydroxytoluene. The synthesis process comprises the following steps: S1, mixing 2,6-dihalogenated toluene, alkali, a heavy metal salt catalyst and an adsorbent, and heating and hydrolyzing to obtain a salt solution of 2,6-dihydroxytoluene; S2, adjusting the pH value of the 2,6-dihydroxytoluene salt solution obtained in the previous step to be weakly acidic by using an acid, separating a separated solid, and purifying to obtain a pure product of 2,6-dihydroxytoluene. The adopted main raw materials, such as 2,6-dichlorotoluene, cuprous chloride, sodium dodecyl sulfate and potassium hydroxide, are common chemical raw materials in the market, and are cheap, easy to obtain and wide in source; the synthesis route is short, steps are few, operation is simple, and production cost is greatly saved; reaction conditions are mild, and industrial production is facilitated; the process route is less in three wastes, the catalyst and the adsorbent can be repeatedly used, emission of the three wastes is further reduced, and the method is environment-friendly; the yield of the whole route is high, and the cost advantage is remarkable.