Preparation technology suitable for electronic grade solid hexamethylenediamine tetramethylene phosphonic acid
A technology for the preparation of hexamethylene diamine tetramethylene phosphonic acid, which is applied in the field of preparation of high-purity solid hexamethylene diamine tetramethylene phosphonic acid. and other issues, to achieve the effect of eliminating environmental pollution, mild operating conditions, and conducive to filtering operations
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[0043] Example 1:
[0044] Use high-purity water to flush the reactor, condenser, pipeline, valve, centrifuge and other related equipment once. Put 2000kg of high-purity phosphorous acid and 2000kg of 30% hydrochloric acid into the reactor, stir slowly, stir at 60rpm, and add 500kg of hexamethylenediamine dropwise at 50℃ for 4 hours; after dripping, heat to 60℃ and add dropwise 1800kg of formaldehyde, 2 hours of dropping time, after dropping formaldehyde, keeping it at 75°C for 1 hour; after the temperature drops to 65°C, add crystal nucleating agent 1200g of diaminetetramethylenephosphonic acid solid, at this time crystals are precipitated; After the temperature was raised to 85°C, 1100kg of formaldehyde was added dropwise. The dropping time was 1 hour. After the dropping, the temperature was kept for 2 hours; the temperature was gradually lowered to 15°C, and the gradient cooling rate was controlled at 25°C per hour. At this time, a large amount of crystals were precipitated. Ce...
Example Embodiment
[0045] Example 2:
[0046] Use high-purity water to flush the reactor, condenser, pipeline, valve, centrifuge and other related equipment once. Put 1200kg of high-purity phosphorous acid and 800kg of 30% hydrochloric acid into the reactor, stir slowly, stir at 60rpm, add 320kg of hexamethylenediamine dropwise at 50℃ for 2 hours; after dripping, heat up to 60℃ and add dropwise 800kg of formaldehyde, dripping time for 2 hours, after dripping formaldehyde, keep it at 75°C for 1 hour; after the temperature drops to 65°C, add 800g of crystal nucleating agent diamine tetramethylene phosphonic acid solid, at this time crystals precipitate; After the temperature was raised to 85°C, 800kg of formaldehyde was added dropwise. The dropping time was 1 hour. After the dropping was completed, the temperature was kept for 2 hours; the temperature was gradually reduced to 35°C, and the gradient cooling rate was controlled at 15°C per hour. At this time, a large amount of crystals were precipitated...
Example Embodiment
[0047] Example 3:
[0048] According to the operating procedure of Example 1, 1000 g of crystal nucleating agent hydroxyethylene diphosphoric acid was added, and the others were the same as in Example 1. After testing, the active content of the product based on HDTMPA is 98%, and the content of arsenic is 0.3mg / L.
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