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Basic Studies on Process of Air Stripping by High Gravity in Technology of Extracting Bromine from Brine

Author: ZhangLinNa
Tutor: LiuYouZhi
School: University of North
Course: Chemical Engineering
Keywords: Bromine extraction High Gravity Stripping rate Rotating packed bed Oxidation liquid
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 122
Quote: 2
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Abstract


According to the domestic and foreign Brine bromine technology development and research status, the various bromine extraction method, and the country's industrialization brine the bromine extraction mainstream process analysis - air blown out of the process characteristics and production status of the acid absorption method , pointed out the existing problems in the process blowing process: First, the low status of brine bromine content, oxidation liquid stripping ratio of free bromine hard to break, causing brominated waste of resources and high energy consumption; Second, existing process gas-liquid ratio of more than 120 m 3 / m 3 , stripping rate it is difficult to further increase. For these two problems, this paper presents the application of high gravity technology ideas to strengthen the process blowing process. The technology is highly efficient mass transfer characteristics of rotating packed bed and the bed pressure drop smaller advantages to achieve of improve oxidation liquid free bromine stripping ratio and the purpose of reducing energy consumption. The air and Br 2 -H 2 O as experimental system, free bromine analog oxidation solution at room temperature and atmospheric pressure stripping rotating packed bed mass transfer mathematical model in free bromine. The research results show that the rotating packed bed is a mass transfer equipment to strengthen the mass transfer coefficient of the the free bromine liquid phase experiments measured the total volume of K L the a for 0.1238 s - existing processes conventional packed column mass transfer coefficient (0.000728s - 1) 170 times. The established volumetric mass transfer coefficient, dimensionless equations, the analysis of the experimental data to verify the correctness of modeling. In this paper, the blowing off of the analog oxidation solution free bromine rate Objectives of the mission, were investigated under normal temperature and pressure, operating parameters the gravity factors into the air, into the amount of fluid pH, oxidation liquid bromine concentration stripping rate and other physical properties of factor. Experiments show that the optimal process parameters are: oxidation solution pH of 3.5, the feed rate of 12m 3 / h, into the fluid volume of 0.10m 3 / h ( The gas-liquid ratio 120m 3 / m 3 ), gravity factors of 42.46. Under the process conditions, the total bromine concentration of 150mg / L and 450mg / L of the single-stage oxidation liquid stripping rate was 78.3% and 91%, respectively, for the three stripping, the total stripping rates of up to 81.27%, respectively, and 95.3%; total bromine concentration of 2000mg / L single-stage oxidation solution stripping rate up to 94.5%. Gravity technology the free bromine blowing in a higher concentration of the oxidizing solution the off rate effect is more significant. Compared with conventional packed column gas-liquid ratio more than 120m 3 / 3 , free bromine blowing off rate rotating packed bed stripping rate also improve the space, but also in the case of the same gas to liquid ratio, gas resistance is smaller than the packing tower, reducing the total pressure of the wind turbine, reducing the cost of equipment and investment. Meanwhile, the small size of the device, the height of tower equipment only 1/5-1/10, liquid handling equipment to reduce energy consumption. In addition, its operating flexibility, small footprint, low cost, easy installation and maintenance, easy to industrialization enlarged advantage is more conducive to the establishment of the bromine extraction of brine resources distributed and the new production line.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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