83-56-7Relevant articles and documents
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.
Production of martite nanoparticles with high energy planetary ball milling for heterogeneous Fenton-like process
Rahmani, Amir,Khataee, Alireza,Kaymak, Baris,Vahid, Behrouz,Fathinia, Mehrangiz,Dindarsafa, Mahsa
, p. 81219 - 81230 (2016/09/09)
Natural martite microparticles (NMMs) were prepared with a high energy planetary ball mill to form a nanocatalyst for a Fenton-like process. Martite nanoparticles (MNs) of different scales are formed when the milling time ranges from 1 to 5 h at the milling speed of 300 rpm. The catalytic performances of MNs are higher than the NMMs for the degradation of acid blue 5 (AB5) in a heterogeneous Fenton-like process. The NMMs and the MNs were characterized by SEM, EDX, BET, XRD and FT-IR analyses. The size distribution of the 5 h milled martite nanoparticles (MN3) is in the range of 20 nm to 100 nm, and these have the highest surface area (19.23 m2 g-1). The influence of the main operational parameters, including initial pH, MN3 dosage, H2O2 and initial dye concentration, were investigated on the AB5 degradation. The treatment process obeys pseudo first order kinetics and some of the degradation intermediates were recognized by the GC-MS method. The environmentally-friendly production of the MNs, low amount of leached iron and repeated catalyst usage are the significant advantages of this research. Finally, an artificial neural network (ANN) is expanded to estimate the degradation efficiency of AB5 on the basis of the experimental results, which indicates the appropriate performance (R2 = 0.955).
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.