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Study on the Mass Transfer Performance of Extracting Boric Acid by 2-Ethyl Hexanol

Author: GengHui
Tutor: LiChunLi；LvJianHua
School: Hebei University of Technology
Course: Chemical Process Equipment
Keywords: Boric acid Isooctanol Complexation extraction Mass transfer coefficient Two-film theory Droplets Extraction rate
CLC: TS311
Type: Master's thesis
Year: 2010
Downloads: 59
Quote: 1
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Abstract


Provide a theoretical basis for the reasonable selection of extraction equipment for the realization of the industrialization of boric acid extraction from salt lake brine , 2 - ethylhexyl alcohol (commonly known as isooctanol ) as a complexing agent , toluene diluent extractants of complexing extraction of boric acid from strongly acidic high magnesium low boron brine mass transfer process mechanism . Research the complexing agent isooctanol , different diluents ( toluene , kerosene , methyl phenol) in different proportions , the split-phase and single-stage extraction rate . Studies have shown that better than kerosene and methyl phenol , toluene as diluent , thinner viscosity and extracted complexes with thinner between sparse solubilization . To isooctanol (2 - ethylhexyl alcohol ) as a complexing agent , toluene as diluent , rising droplet method , operating parameters the boric acid and isooctanol , initial concentration , temperature , and two compared to the interfacial area kinetics of boric acid isooctyl alcohol extraction of salt lake brine . The results show that : isooctyl alcohol and boric acid complexation reaction for rapid reaction , and the reaction occurs in the two-phase interface area ; extraction process is a diffusion-controlled mode ; using the method of least squares regression of the experimental data on the basis of this study , analysis, the aqueous phase was pH = 1 and the temperature T = 318.15 K , isooctanol extraction of boric kinetic equation, the rate constants of the equation , the relative standard deviation of 5.318 percent . Around a single droplet mass transfer , the mass transfer performance of the isooctanol extraction of boric acid . By the stress analysis of droplets that stage in the freedom movement in the brine , the organic phase droplets , the droplets flow pattern is a transition zone ( Allen District ) . According to the model of the double membrane , joint drops within drops outside sub empirical correlation of the mass transfer coefficient , the calculation of the overall mass transfer coefficient model , and the model calculations and experimental values ??were compared , the average relative error of 8.380% , show that the model can be used for the extraction equipment design reference . Meanwhile, from within the droplets , the droplets outer stars the relative size of the mass transfer resistance , it is judged that the total mass transfer resistance mainly affected by the influence of mass transfer resistance within the droplets stars for the strengthening of the mass transfer within the droplets , it should be in order to improve throughput as the main control means .

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CLC: > Industrial Technology > Light industry,handicrafts > Salt industry > Salt the basis of science > Physical and chemical properties of sea water, brine,salt
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