Name | Diammonium hydrogen phosphite |
Synonyms | AMMONIUM PHOSPHITE Diammonium hydrogen diammonium phosphite Ammonium hydrogenphosphite AMMONIUM PHOSPHITE, DIBASIC Diammonium hydrogen phosphite |
CAS | 51503-61-8 |
Molecular Formula | H9N2O3P |
Molar Mass | 116.06 |
Density | 1.619 (anhydrous) [CRC10] |
Melting Point | decomposes at 155 (anhydrous) [CRC10] |
Water Solubility | soluble H2O [MER06] |
Storage Condition | 2-8℃ |
CN201720691020.7
application date:
20170614
Public/Announcement Number:
CN207093466U
Public/announcement date:
20180313
applicant (patent):
Rudong Zhenfeng Yiyang Chemical Co., Ltd.
inventor:
National and provincial code:
CN320623
Abstract:
The utility model discloses a noise-reducing centrifugal pump for producing diammonium phosphite, which comprises a base and a bearing, and a pump body bracket is provided on the left upper surface of the base, the lower surface of the base is provided with a shock-absorbing spring, the lower side of the shock-absorbing spring is provided with a shock-absorbing foot near the intermediate position, and the upper surface of the pump body bracket is provided with a pump body, A water inlet is provided at the middle position of the left side of the pump body, and an impeller is provided at the middle position of the pump body near the left side of the water inlet; The lengthening of the water inlet channel slows down the impact of water flow on the blades, the life of the impeller and the reliability of the pump body are increased, the centrifugal force of the pump body is increased, the working efficiency is improved, and the shock absorber spring under the base effectively buffers the vibration of the ground, the noise of the pump body is reduced, and the comfort of the whole working environment is improved. It also provides a powerful condition for the information transmission of chemical production, and ensures the reliability of the production.
Abstract:
The waste liquid of arsenic removal from yellow phosphorus is the arsenic-containing waste liquid produced in the process of arsenic removal by aqueous phase oxidation, the waste liquid contains arsenic in the form of arsenic acid or arsenous acid, which is extracted by the process of refining and dearsening of phosphoric acid and phosphorous acid and yellow phosphorus. In this paper, through the purification of arsenic removal, oxidation conversion, neutralization, concentration crystallization separation method, the use of waste liquid in the phosphoric acid and phosphorous acid and other valuable components. Firstly, the chemical precipitation method is used to remove arsenic from the waste liquid of yellow phosphorus refining and arsenic removal. The results show that the chemical precipitation method has a good effect on arsenic removal in the waste liquid of arsenic removal from yellow phosphorus refining. The arsenic content in the waste liquid can be reduced from 230ppm to 0.35ppm, and the arsenic removal rate can reach 99.85%; the optimum technological conditions for arsenic removal were as follows: the mass of arsenic removal agent P2S5 was 0.081g, the reaction temperature was 80 ℃, the reaction time was 110min, and the stirring speed was 300r/min when the waste liquid treatment capacity was 100mL. In this paper, phosphorous acid is oxidized to orthophosphoric acid by redox method, and then the phosphorous acid and orthophosphoric acid in waste liquid are comprehensively utilized. Based on the first study of the oxidation properties of pure phosphorous acid, using hydrogen peroxide as oxidant, the amount of hydrogen peroxide, temperature, reaction time, the effect of pH value and stirring speed of the reaction liquid on the oxidation rate of phosphorous acid in the waste liquid of yellow phosphorus refining, and the optimum technological conditions of oxidation were obtained by orthogonal test: when the waste liquid treatment capacity was 100mL, the dosage of oxidant H2O2 is 30ml, the pH value is 7, the stirring speed is 350, the reaction temperature is 70 ℃, and the reaction time is 120min. Under these conditions, using hydrogen peroxide as oxidant, H3PO3 in waste liquid can be oxidized to H3PO4, the oxidation rate can reach 87.62%, and the reproducibility is good. The process conditions of preparing diammonium hydrogen phosphate from oxidized yellow phosphorus waste liquid were also studied in this paper. The results show that the optimal process conditions for the preparation of diammonium hydrogen phosphate from waste liquid treated in the early stage are as follows: The neutralization pH value of phosphoric acid and ammonia water is 8.6, the reaction temperature is 85 ℃, and the reaction time is 40min, the stirring speed was 250rpm and the crystallization temperature was 25 °c. Under these conditions, the diammonium hydrogen phosphate product was obtained, which was white powder with the particle size of 50.9 μm-62.6 m, chemical analysis and X-ray diffraction analysis show that the compounds mainly exist in the form of (NH4)2HPO4, and the product quality of P2O5,N meets the quality requirements of high-grade diammonium phosphate products in GB 10205-2001. In addition, on the basis of the research and verification of the solubility of potassium phosphite, sodium salt and ammonium salt, this paper carried out an exploratory experimental study on the direct separation of potassium phosphite based on this solubility. The results show that the potassium dihydrogen phosphate crystals with the cumulative mass (dry weight) of 18.9530g are precipitated after neutralization with potassium hydroxide, the initial reaction and the second cycle of mother liquor. The yield can reach 91.63%, the samples were analyzed without the existence of phosphite, which showed that the crystals were orthophosphate, and the positive, potassium phosphite was effectively separated by step crystallization. In this paper, after purifying and removing arsenic and other harmful impurities in waste liquid, two ways are used to utilize phosphoric acid, phosphorous acid and other valuable components in waste liquid respectively. One is to oxidize phosphorous acid to orthophosphoric acid and then use it; phosphoric acid and phosphorous acid are directly separated or made into phosphate and phosphite and then directly separated to obtain orthophosphoric acid and phosphorous acid or orthophosphate and phosphite. Due to the high value of the two ways of using phosphoric acid and phosphite, this paper can not only make full use of waste liquid, but also achieve the purpose of energy saving and emission reduction, clean production and environmental protection, at the same time, it produces high economic benefits and improves the process of yellow phosphorus refining and arsenic removal, so it has good practical application value.
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Key words:
yellow phosphorus and arsenic removal effluent arsenic removal oxidation Use
cited:
Application (patent) number:
CN201720582099.X
application date:
2017.05.24
Public/Announcement Number:
CN207095326U
applicant (patent):
Jiangxi Xinxin Chemical Co., Ltd.
inventor:
Fang Junwei , Qiu native , Yang Haibin , Hong literature
National and provincial code:
Jiangxi; 36
Abstract:
The utility model discloses a steam condensing device prepared by extracting diammonium hydrogen phosphite, which comprises a steam collection chamber, a main cooling pipe, an auxiliary cooling pipe and a liquid outlet pipe, the lower end of the steam collection chamber is provided with a discharge nozzle, the periphery of the steam collection chamber is provided with a main cooling pipe, and the main cooling pipe is provided with a ring sleeve, a support frame, a rotating shaft, a ball bearing and a fan blade, the steam collection chamber is provided with auxiliary cooling pipes, and the auxiliary cooling pipes are connected with water inlet pipes. The lower end of the steam collection chamber is provided with a liquid outlet pipe, a guide bottom plate, a threaded rod, a sealing plug and a liquid outlet. The utility model improves the condensation collection efficiency through internal and external double cooling; Improves the use effect of the condensate by adding a rotatable fan blade; And through the design of the guiding bottom plate and the threaded rod in the liquid outlet pipe and the sealing plug, facilitate condensation collection.
sovereignty:
1. A steam condensing device for extracting and preparing diammonium hydrogen phosphite, comprising a steam collection chamber (1), a main cooling pipe (2), an auxiliary cooling pipe (3) and a liquid outlet pipe (4), it is characterized in that the lower end of the steam collection chamber (1) is connected with a feeding nozzle (11), and the periphery of the steam collection chamber (1) is welded with a main cooling pipe (2), the main cooling pipe (2) is located in the right side of the steam collection chamber (1) and is welded with a ring sleeve (21), and the ring sleeve (21) A support frame (22) is provided for horizontal welding between the inner walls. The middle part of the left end of the support frame (22) is welded with a rotating shaft (23), and the peripheral welding of the rotating shaft (23) is provided with a ball bearing (24), and the ball bearing (24) A fan blade (25) is provided in the peripheral welding, and a sub-cooling duct (3) is provided around the inner wall of the steam collection chamber (1), and the sub-cooling duct (3) the right end is connected with a water inlet pipe (31), and the lower end of the steam collection chamber (1) is connected with a liquid outlet pipe (4) at the periphery of the discharge nozzle (11), The lower end of the liquid discharge pipe (4) is welded with a guide bottom plate (41), the middle part of the guide bottom plate (41) is vertically rotated with a threaded rod (42), and the threaded rod (42) A sealing plug (43) is provided in the connection of the periphery and the corresponding position of the discharge nozzle (11), the left wall of the liquid discharge pipe (4) and the guiding bottom plate (41) A liquid outlet (44) is provided through the corresponding position on the left side.