83-56-7Relevant articles and documents
Production method of 1,5-dihydroxy naphthlene
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Paragraph 0023-0030, (2017/03/14)
The invention discloses a production method of 1,5-dihydroxy naphthlene, which is characterized by comprising the following steps: taking the following raw materials in parts by weight: 10 parts of sodium hydroxide and 5-8 parts of sodium 1,5-naphthalene disulfonate with the water content of 3-10%; adding the sodium hydroxide into an alkali fusion reaction kettle, and heating to 260-320 DEG C; slowly and uniformly adding the sodium 1,5-naphthalene disulfonate with the water content of 3-10% while stirring; and hydrolyzing, lowering the temperature in the reaction kettle, slowly acidifying with 40-60% sulfuric acid, adding activated carbon accounting for 2 wt% of the sodium 1,5-naphthalene disulfonate and an inorganic salt catalyst into the reaction solution, and acidifying the filtrate with the rest 50% sulfuric acid until the pH value is 3-6, thereby obtaining the 1,5-dihydroxy naphthlene crude product with the purity of 95-97.8% and the water content of 30-50% and a pressure filtration mother solution. The method has the advantages of high product purity, high product quality, no pollution, recyclable generated mother solution, energy saving and environment friendliness.
A 1,5-dihydroxynaphthalene preparation method
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Paragraph 0050, (2017/03/14)
The invention provides a preparation method of 1,5-dihydroxy naphthalene. The preparation method comprises the following steps: after sulfonation reaction between refined naphthalene and sulfonating agents, salting out to obtain reaction solid and reaction liquid; in the presence of catalysts, heating the reaction solid obtained in the former step, water and inorganic strong alkali to react to obtain1,5-dihydroxy naphthalene, wherein the catalysts are one or more of methanol, ethanol and propanol. The preparation method provided by the invention has the beneficial effects that the reaction temperature in the alkali fusion step in the 1,5-dihydroxy naphthalene production process is reduced, thus reducing the requirements of equipment and reducing the danger coefficient in actual production, so that the reaction conditions are mild and the preparation method is easy to operate.
An efficient method for demethylation of aryl methyl ethers
Zuo, Li,Yao, Shanyan,Wang, Wei,Duan, Wenhu
, p. 4054 - 4056 (2008/09/20)
A new efficient method for demethylation of aryl methyl ethers using iodocyclohexane in DMF under reflux condition is described.