Production method of 1,5-dihydroxy naphthlene
A dihydroxynaphthalene and production method technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of environmental pollution, high cost, low yield, etc., and achieve high product purity, not easy to oxidize and deteriorate , Good product quality
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Embodiment 1
[0016] 1. Put 400kg of sodium hydroxide into the alkali-dissolving kettle, raise the temperature to 290℃, add 14kg of 1.5-naphthalene disulfonate sodium salt, and put in 14kg of 1.5-naphthalene disulfonate sodium salt every 5 minutes, for a total of 280kg of 1.5-naphthalene disulfonate Sodium acid;
[0017] 2. Keep stirring at 300°C for 2 hours after casting;
[0018] 3. After heat preservation, use 2000kg tap water for hydrolysis reaction.
[0019] 4. Cool down to 55°C, add 560kg of 50% sulfuric acid for acidification reaction, the acidification temperature does not exceed 60°C, after adding 560kg of 50% sulfuric acid, add 0.56kg of activated carbon, then add 280g of inorganic salt catalyst, stir for 8 minutes filter;
[0020] 5. Add 560kg of 50% sulfuric acid to the filtrate, acidify to PH=3, and press filter to obtain 1.5-dihydroxynaphthalene with a water content of 35% and a purity of 97.5%;
[0021] 6. Press filter mother liquor and cool to 13°C. Centrifuge to obtain s...
example 2
[0024] 1. Put 400kg of sodium hydroxide into the alkali-dissolving kettle, raise the temperature to 300°C and add 14kg of 1.5-naphthalene disulfonate sodium salt every 5 minutes, totaling 280kg.
[0025] 2. After casting, keep stirring at 305°C for 2 hours;
[0026] 3. after the insulation is finished, use the centrifuge mother liquor 1200kg that embodiment one obtains and press filter mother liquor 960kg hydrolysis reaction;
[0027] 4. Cool down to 55°C, add 560kg of 50% sulfuric acid for acidification reaction, the acidification temperature does not exceed 60°C, after adding 560kg of 50% sulfuric acid, add 0.56kg of activated carbon, then add 200g of inorganic salt catalyst, stir for 8 minutes filter;
[0028] 5. Add 560kg of 50% sulfuric acid to the filtrate, acidify to PH3, and press filter to obtain 1.5-dihydroxynaphthalene with a moisture content of 35% and a purity of 97.5%;
[0029] 6. Cool the filter press mother liquor to 15°C. Centrifuge to obtain 1050kg of sodiu...
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