The influence of technological parameters on dehydrochlorination
of dichloropropanols to epichlorohydrin performed on a reaction-stripping
column and a prereactor was studied. For a fixed flows of dichloropropanols
solution, lime milk solution, and steam through the column, the conversion
of dichloropropanols and the yield of epichlorohydrin were calculated.
The influence of an excess of lime milk solution, recirculation of
the water layer of the distillate from the column, the rate of steam
flow through the column, and an excess of calcium hydroxide over dichloropropanols
on the course of the process was studied. Moreover, the effects of
the reaction time and temperature of the prereactor were tested.
The influence of pre-reactor and reactor temperatures on the conversion of 1,3-dichloropropan-2-ol and the selectivity of its transformation to epichlorohydrin in continuous dehydrochlorination for two modes of the reaction product collection was studied. The dehydrochlorination process and mechanism of diglycidyl ether formation are described.
The results of continuous dehydrochlorination of an 88 wt % aqueous solution of 1,3-dichloropropan-2-ol (13DCP2OL) to epichlorohydrin (EPI) are presented. The dehydrochlorination was carried out in the reaction-stripping column system. The influence of the following parameterslime milk concentration, the molar ratio of Ca(OH) 2 /13DCP2OL, the rate of steam flow through the column, pressure, changes in loading of reaction-stripping column, reaction time in a prereactor and reactor on the conversion of 13DCP2OL, and the selectivity of transformation to EPIwere studied. In one series of investigations, EPI was collected from the column in the form of distillate, in the second one, from the distillation reboiler under the column. It was evaluated which methods of collection of EPI distillate are more favorable. The technological parameters were provided for the operation of the reaction-stripping system, which allow one to obtain EPI with the selectivity close to 100%, simultaneously giving high conversion (90%) of 13DCP2OL.
The results of dehydrochlorination of 1,3-dichloropropan-2-ol to epichlorohydrin are reported. The process ran in the reaction-stripping column system with a continuous removal of epichlorohydrin in a steam stream. The infl uence of 10 wt% alkali solution (NaOH, Ca(OH) 2 ) and the method of distillate collection on the 1,3-dichloropropan-2-ol conversion, selectivity of transformation to epichlorohydrin and by-products, and the composition of wastewater have been analysed.
The results of dehydrochlorination of 88 wt% aqueous solution of 1,3-dichloropropan-2-ol to epichlorohydrin are reported. The process was carried out in the reaction-stripping column system with a continuous removal of epichlorohydrin in the steam stream. Aqueous solutions of sodium and calcium hydroxides at concentrations in the range of 3-14 wt% were used for the dehydrochlorination. The infl uence of the type and concentration of dehydrochlorination agent on 1,3-dichloropropan-2-ol conversion, the selectivity of transformation to epichlorohydrin and by-products, and the composition of distillate and wastewater were studied.
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