Method for producing industrial-grade ammonium dihydrogen phosphate through microreaction of wet-method phosphoric acid
A technology of first-grade ammonium dihydrogen phosphate and wet-process phosphoric acid, applied in the direction of phosphate and phosphorus-containing oxoacid, can solve the problem of complex purification equipment of wet-process phosphoric acid purification method, high production cost of thermal-process phosphoric acid process, and restriction of comprehensive promotion and application. and other problems, to achieve the effect of improving efficient utilization, small footprint and small investment
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Embodiment 1
[0027] A method for producing technical-grade ammonium dihydrogen phosphate by micro-reaction of wet-process phosphoric acid, comprising the following steps:
[0028] (1) Phosphoric acid micro-extraction: After desulfurization, defluorination, and arsenic treatment of phosphoric acid, after filtering impurities, the content of P2O5 (ω / %) is 40%, the sulfate (ω / %) is 1.2%, and the content of arsenic ( ω / %) is the pretreatment phosphoric acid of 0.8%, after concentration is 20% tributyl phosphate and kerosene mixing, then with pretreatment phosphoric acid, pumps in the microreactor with the flow rate of 30ml / min by metering pump respectively, Perform micro-extraction at 20°C to obtain a phosphorus-containing oil phase with a ratio (O / W) of 1:1;
[0029] (2) Preparation of potassium dihydrogen phosphate: the phosphorus-containing oil phase in step (1) and 20% ammonia water are pumped into the microreactor respectively to obtain ammonium dihydrogen phosphate and an empty oil phase...
Embodiment 2
[0031] A method for producing technical-grade ammonium dihydrogen phosphate by micro-reaction of wet-process phosphoric acid, comprising the following steps:
[0032] (1) Phosphoric acid micro-extraction: After desulfurization, defluorination, and arsenic treatment of phosphoric acid, after filtering impurities, the P2O5 content (ω / %) was 40%, the sulfate (ω / %) was 1.1%, and the arsenic content ( ω / %) is the pretreatment phosphoric acid of 0.75%, after concentration is 50% tributyl phosphate and kerosene mixing, then with pretreatment phosphoric acid, pumps in the microreactor with the flow velocity of 100ml / min respectively by metering pump, Perform micro-extraction at 70°C to obtain a phosphorus-containing oil phase with a ratio (O / W) of 1:5;
[0033] (2) Preparation of potassium dihydrogen phosphate: the phosphorus-containing oil phase in step (1) and 30% ammonia water are pumped into the microreactor respectively to obtain ammonium dihydrogen phosphate and an empty oil pha...
Embodiment 3
[0035] A method for producing technical-grade ammonium dihydrogen phosphate by micro-reaction of wet-process phosphoric acid, comprising the following steps:
[0036] (1) Phosphoric acid micro-extraction: after desulfurization, defluorination, and arsenic treatment of phosphoric acid, after filtering impurities, the P2O5 content (ω / %) is 40%, the sulfate (ω / %) is 1%, and the arsenic content ( ω / %) is the pretreatment phosphoric acid of 0.7%, after concentration is 30% tributyl phosphate and kerosene mixing, then with pretreatment phosphoric acid, pumps in the microreactor with the flow rate of 60ml / min by metering pump respectively, Perform micro-extraction at 20-70°C to obtain a phosphorus-containing oil phase with a ratio (O / W) of 1:2;
[0037] (2) Preparation of potassium dihydrogen phosphate: the phosphorus-containing oil phase in step (1) and 25% ammonia water are pumped into the microreactor respectively to obtain ammonium dihydrogen phosphate and an empty oil phase.
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