A kind of preparation method of acicular methylene white crystal
A methylene white crystal technology, which is applied in the field of preparation of needle-like methylene white crystals, achieves the effects of low production cost, low toxicity, and prolonged residence time
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Embodiment 1
[0020] (1) Prepare 45 ml of an aqueous solution containing 0.091 moles per liter of L-glutamic acid, 0.024 moles per liter of disodium hydrogen phosphate and 0.038 moles per liter of sodium hydroxide, stir at room temperature to dissolve completely; then add calcium nitrate and urea in sequence and methylene blue at concentrations of 0.026 moles per liter, 0.056 moles per liter and 0.696 millimoles per liter, respectively;
[0021] (2) Stir the solution in step (1) evenly and transfer it to a stainless steel autoclave with a charging rate of 90%, react at a temperature of 100oC for 24 hours, then heat up to 160oC for 24 hours and then cool to room temperature;
[0022] (3) The reaction product obtained in step (2) was filtered and washed to prepare needle-like methylene white crystals, and finally put into 25 ml of an aqueous solution containing 0.381 moles per liter of sodium sulfite for sealed storage.
[0023] Optical microscope inspection product morphology see figure 1 ....
Embodiment 2
[0025] (1) Prepare 45 ml of an aqueous solution containing 0.091 moles per liter of L-glutamic acid, 0.024 moles per liter of disodium hydrogen phosphate and 0.038 moles per liter of sodium hydroxide, stir at room temperature to completely dissolve, then add calcium nitrate and urea in sequence and methylene blue at concentrations of 0.026 moles per liter, 0.056 moles per liter and 0.696 millimoles per liter, respectively;
[0026] (2) Stir the solution in step (1) evenly and transfer it to a stainless steel autoclave with a charging rate of 90%, treat it at 100oC for 24 hours, then heat it up to 140oC for 24 hours and cool to room temperature;
[0027] (3) The reaction product obtained in step (2) was filtered and washed to prepare needle-like methylene white crystals, and finally put into 25 ml of an aqueous solution containing 0.762 moles per liter of sodium sulfite for sealed storage.
[0028] Optical microscope inspection product morphology see figure 2 .
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