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Study on the Purification of m-Dichlorobenzene
Author: YeBo
Tutor: BaiZiLong
School: East China University of Science and Technology
Course: Chemical processes
Keywords: M - dichlorobenzene P-dichlorobenzene Complex separation Adsorption separation
CLC: TQ242
Type: Master's thesis
Year: 2011
Downloads: 108
Quote: 0
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Abstract
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With the wide range of applications in the field of synthetic pesticides and other , m-dichlorobenzene demand is increasing. The dichlorobenzene isomers of a similar nature , so how to become a hot topic experts and scholars from bit product mixture purification . This topic dichlorobenzene solution containing 15% p-dichlorobenzene between the choice of dichlorobenzene the complexation adsorption separation combined with the combined process of separation and purification . The complexation process examines the complexation conditions for the effect of separation , to filter out the better complexation conditions : the use of polyethylene glycol 6000 as a complexing agent , the complexing agent is used in an amount ratio of p-dichlorobenzene mass 1:1 ; reaction temperature of 45 ° C for 5 minutes ; cooling temperature 4 ° C , time 30 minutes ; stirring reaction and cooling process is required . The complexation gel by vacuum distillation for recycling. Adsorption process dichlorobenzene solution -bit content of less than 2 % , at 20 ° C under hydrophobic silica zeolite molecular sieve adsorption adsorption isotherms of the Langmuir equation . Dynamic Investigation of adsorption temperature, space velocity on the separation solution airspeed at 20 ℃, 2.3 g / ( h · g zeolite ) under conditions -dichlorobenzene solution of the the 1G zeolite processing meta- content of 98% can be obtained when 4.35g99.5% products and 7.25g99% .
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