the study of make 2,5-Dichlorophenol

As is known to all chemical is play an important role in our life. Once use undeserved, it can cause harm to our health. 2,5-Dichlorophenol, the formula is C6H4Cl2O, Molecular weight is 163.00 . It is colorless needle crystal. It is colorless needle crystal. Melting point is 56 58 ℃, boiling point is 225-227 ℃ (100.26kpa), 211 ℃(101.858kPa). It is soluble in ethanol, ethyl ether, benzene, slightly soluble in water. It can be used as synthetic organic intermediates, mainly for the manufacture herbicide wheat straw Dan and etc, nitrogen Dp mould inhibitor synergistic agent.
There are some preparation methods. The first one, to 2, 2, chloro aniline as raw materials, add sulphuric acid and sodium nitrite in diazo, via hydrolysis and finished products. The second one, to 1 4-trichlorobenzene three chlorobenzene as raw material, and caustic soda and solvent in a certain temperature and pressure on hydrolysis reaction, 2, 2, sodium chloride phenol and 2, 2, then after sodium chloride phenol hydrochloric acid acidification and crude products mixture. Then, by urea bonus separation by 2, 4-2 of 2, to chlorine after-two chlorine phenol finished products.
There reported another way to synthetize 2,5-Dichlorophenol.That is easy to cheap 2.5-dichloroaniline as raw materials, the heavy nitrogen change, hydrolysis 2,5 a few X phenol. 60 mL 98 sulfuric acid and 6 mL water made up 90% A mixture of sulfuric acid solution, join the log 2,5-dichloroaniline powder solid Stir in, dissolved in 60~70 ℃ join solid based sodium in diazo reaction, sodium nitrite plus again after heat preservation reaction The 0.5 h, temperature to 110 ~ 120 ℃ make heavy nitrogen salt decomposition. Heavy nitrogen salt decomposition reaction system after completely to the steam rice on water vapor evaporate fractions. Collect the solid, washed out steam under 30 ℃, vacuum drying 2,5-Dichlorophenol.
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