Phosphoric acid concentration system and technology
A phosphoric acid concentration and section technology, applied in phosphoric acid concentration system and process field, can solve the problem of low final phosphoric acid concentration, and achieve the effects of high thermal conductivity, low corrosion rate and good operating environment
Inactive Publication Date: 2018-10-19
无锡英罗唯森科技有限公司
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Problems solved by technology
[0004] The object of the present invention is to provide a phosphoric acid concentration system and process, which aims to improve the problems of waste gas treatment and low final phosphoric acid concentration in the existing phosphoric acid concentration process
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[0041] During the concentration of phosphoric acid, with P 2 o 5 The increase of the concentration, the sludge scaling on the heat transfer surface of the heater and the corrosion of equipment pipes affect the heat transfer performance and the service life of the equipment; the wet-process phosphoric acid is heated indirectly by steam and concentrated by a forced-circulation vacuum evaporation shell-and-tube heat exchanger. Phosphoric acid The mass fraction is between 0 and 76%P 2 o 5 When it boils, only water vapor exists in the equilibrium gas phase, theoretically phosphoric acid can be concentrated to a very high concentration, but as the concentration of phosphoric acid increases, some impurity components in dilute sulfuric acid will precipitate out due to the decrease in solubility. The increase in the viscosity of phosphoric acid makes it difficult to concentrate phosphoric acid. Existing phosphoric acid concentration technology cannot concentrate dilute sulfuric acid...
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The invention relates to the field of chemical engineering, in particular to a phosphoric acid concentration system and technology. The phosphoric acid concentration system comprises a first-stage falling film evaporation work section and a second-stage falling film evaporation work section; in the second-stage falling film evaporation word section, the dilute phosphoric acid is conveyed to theupper part of a falling film evaporator through a circulation pump for feeding, dilute phosphoric acid enters a heat exchange pipe after being uniformly distributed through a distributor, is heated with saturated vapor, falls and vaporized in the heat exchange pipe and is subjected to gas-liquid separation in a gas-liquid separation tank; primarily concentrated phosphoric acid enters a gas-liquidseparation tank at the second-stage falling film evaporation work section through a circulation concentration pipeline and is conveyed to the upper part of the second-stage falling film evaporator through a circulation pump for feeding; and second-stage evaporation is performed under the vacuum condition, and the operation temperature of high-concentration phosphoric acid evaporation can be lowered. The phosphoric acid concentration system is good in operation environment as well as is environmentally friendly and reduces emission particularly as three wastes (waste water, waste solid and waste gas) are hardly discharged after a gas phase produced with evaporation is condensed with a condenser; and through concentration of the first-stage falling film evaporation work section, by matchingof vacuum operation with the second-stage falling film evaporation work section, forced circulation falling film evaporation enables the phosphoric acid to be concentrated to 100 percent.
Description
technical field [0001] The invention relates to the field of chemical industry, in particular to a phosphoric acid concentration system and process. Background technique [0002] The production capacity of phosphoric acid produced by the dihydric process accounts for about 88% of the total production capacity of wet-process phosphoric acid, but the product concentration is only 26% to 32% (in terms of P 2 o 5 Calculated), and the phosphoric acid concentration is required to be 45% (in P 2 o 5 meter) above, so dilute phosphoric acid must be concentrated. [0003] Concentration of phosphoric acid is considered to be a difficult process. Impurities in dilute phosphoric acid are precipitated with increasing phosphoric acid concentration and deposited on the surface of the vessel wall. In addition, there are waste gas treatment and final phosphoric acid concentration in the process of phosphoric acid concentration. question. Contents of the invention [0004] The purpose o...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B01D1/22C01B25/234
CPCB01D1/22C01B25/2346
Inventor 徐鹏飞李志刚
Owner 无锡英罗唯森科技有限公司