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

Inactive Publication Date: 2018-02-27
GUIYANG KAILIN FERTILIZER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the production cost of the thermal phosphoric acid process is relatively high; the purification device of the wet process phosphoric acid purification process is complex, the process route is lengthy, and the production cost is high; the raw acid impurities in the raffinate process are more, which restricts the product quality; the semi-aqueous wet process phosphoric acid The process technology has high reaction temperature and difficult operation, which restricts the comprehensive application of this technology

Method used

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  • Method for producing industrial-grade ammonium dihydrogen phosphate through microreaction of wet-method phosphoric acid
  • Method for producing industrial-grade ammonium dihydrogen phosphate through microreaction of wet-method phosphoric acid
  • Method for producing industrial-grade ammonium dihydrogen phosphate through microreaction of wet-method phosphoric acid

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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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Abstract

The invention belongs to the field of the preparation of ammonium dihydrogen phosphate, and particularly relates to a method for producing industrial-grade ammonium dihydrogen phosphate through a microreaction of wet-method phosphoric acid. The method comprises the following steps of (1) microextraction of phosphoric acid; (2) preparation of ammonium dihydrogen phosphate. A technique of purifyingthe wet-method phosphoric acid through an extraction method and a preparation technique of the ammonium dihydrogen phosphate are coupled by utilizing a microchemical technique; the purpose of decreasing the investment of a device is realized; meanwhile, the quality of the ammonium dihydrogen phosphate is promoted; meanwhile, the high-efficiency utilization rate of phosphoric acid dihydrate is improved. An organic phase of the phosphoric acid extracted and purified by an organic solvent directly reacts with an ammonia water solution; the qualified industrial-grade ammonium dihydrogen phosphateis prepared. The technique has the advantages that the procedure is short, the investment is low, the utilization of the phosphoric acid is high, the fact that precipitation, caused by the rise of a PH (Potential of Hydrogen) value in a neutralization process, of a residue appears in the whole process, resulting in the loss of phosphorus is avoided and through technical coupling and innovation, the benefit maximization of an industrial device is realized.

Description

technical field [0001] The invention belongs to the field of ammonium dihydrogen phosphate preparation, in particular to a method for producing industrial-grade ammonium dihydrogen phosphate by micro-reaction of wet-process phosphoric acid. Background technique [0002] Monoammonium phosphate is also called ammonium dihydrogen phosphate, and its molecular formula is NH4H2PO4. Because there are many impurities in wet-process phosphoric acid, it is generally only used to produce agricultural fertilizers, so it is also called agricultural-grade wet-process phosphoric acid or fertilizer-grade wet-process phosphoric acid (the following wet-process phosphoric acid refers to fertilizer-grade wet-process phosphoric acid). Industrial-grade monoammonium phosphate is mainly used as a fireproofing agent for drip irrigation fertilizers, wood, paper and fabrics; industrial monoammonium phosphate production processes are divided into thermal phosphoric acid process, wet phosphoric acid pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
CPCC01B25/28C01P2006/80
Inventor 项双龙吴有丽陈彬廖吉星张伟蒋学华张文唐丽君韩朝应何花王采艳
Owner GUIYANG KAILIN FERTILIZER CO LTD
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