Continuous dehydrochlorination of 1,3-dichloropropan-2-ol to epichlorohydrin: process parameters and by-products formation

Krzyżanowska, Anna; Milchert, Eugeniusz

doi:10.2478/s11696-012-0300-x

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…The ET was present in both the distillate and wastewater at the highest molar ratio. In other studies, we have shown that it forms in the reaction EPI with DCP. The selectivity of transformation to the polyethers is a supplementation of the selectivity of transformation to the organic compounds (Table S2) to 100%.…”

Section: Resultsmentioning

confidence: 63%

“…In our research, the dehydrochlorination agent is an aqueous solution of calcium hydroxide. The dehydrochlorination is carried out in the apparatus and according to the method described in a previous paper . A byproduct formed in this process, and the influence of prereactor temperature on the conversion of 13DCP2OL and the selectivity of transformation to EPI using different methods of product collection were also presented in the mentioned paper.…”

Section: Introductionmentioning

confidence: 99%

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Technological Parameters of Dehydrochlorination of 1,3-Dichloropropan-2-ol to Epichlorohydrin

Krzyżanowska

Milchert

Paździoch

2013

Ind. Eng. Chem. Res.

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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 parameterslime 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 EPIwere 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.

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Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Technological Parameters of Dehydrochlorination of 1,3-Dichloropropan-2-ol to Epichlorohydrin

Krzyżanowska

Milchert

Paździoch

2013

Ind. Eng. Chem. Res.

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“…The composition of the reactive mixtures was studied [97], concluding that 1,2-DCH is much less reactive than 1,3-DCH, although primary alkyl alcohols are more acidic than secondary alkyl alcohols. The influence of the reactor on the reaction kinetics [98,99] and of the cation on the 1,3-DCH dehydrochlorination [59,61,97,100] was also studied.…”

Section: Chemical Synthesis Of Echmentioning

confidence: 99%

Preparation and Uses of Chlorinated Glycerol Derivatives

et al. 2020

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Crude glycerol (C3H8O3) is a major by-product of biodiesel production from vegetable oils and animal fats. The increased biodiesel production in the last two decades has forced glycerol production up and prices down. However, crude glycerol from biodiesel production is not of adequate purity for industrial uses, including food, cosmetics and pharmaceuticals. The purification process of crude glycerol to reach the quality standards required by industry is expensive and dificult. Novel uses for crude glycerol can reduce the price of biodiesel and make it an economical alternative to diesel. Moreover, novel uses may improve environmental impact, since crude glycerol disposal is expensive and dificult. Glycerol is a versatile molecule with many potential applications in fermentation processes and synthetic chemistry. It serves as a glucose substitute in microbial growth media and as a precursor in the synthesis of a number of commercial intermediates or fine chemicals. Chlorinated derivatives of glycerol are an important class of such chemicals. The main focus of this review is the conversion of glycerol to chlorinated derivatives, such as epichlorohydrin and chlorohydrins, and their further use in the synthesis of additional downstream products. Downstream products include non-cyclic compounds with allyl, nitrile, azide and other functional groups, as well as oxazolidinones and triazoles, which are cyclic compounds derived from ephichlorohydrin and chlorohydrins. The polymers and ionic liquids, which use glycerol as an initial building block, are highlighted, as well.

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“…This causes not only the corrosion of the reaction equipment but also generates a large amount of by‐products and waste liquid. Besides, there are many problems with refining the main products and separating the catalysts from the reaction mixture . Compared with homogeneous catalysis, solid catalysis enables easier product separation, hence avoiding the production of large volumes of wastewater and increasing the cost efficiency, using less labor materials and financial resources …”

Section: Introductionmentioning

confidence: 99%

“…Besides, there are many problems with refining the main products and separating the catalysts from the reaction mixture. [8][9][10] Compared with homogeneous catalysis, solid catalysis enables easier product separation, hence avoiding the production of large volumes of wastewater and increasing the cost efficiency, using less labor materials and financial resources. [11][12][13][14] A solid base is a substance that can donate electron pairs or accept protons.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of epichlorohydrin from 1,3‐dichlorohydrin with solid catalysts using γ‐Al₂O₃ as carrier material

Zhang

Yang

et al. 2020

Asia-Pacific J Chem Eng

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Alkaline earth metal‐based catalysts applied in the process of dichlorohydrin cyclization into epichlorohydrin were studied. A series of solid catalysts were prepared by the equivalent‐volume impregnation method using γ‐Al2O3 as a carrier, whereas nitrates and chlorides of the three alkaline earth metals (Mg, Ca, and Ba) were employed as precursors. Their catalytic performance was investigated and compared, taking into account the main factors influencing the catalytic efficiency, such as X‐ray diffraction (XRD), N2 adsorption–desorption, energy dispersive spectrometry (EDS) coupled with TEM, and CO2 temperature‐programmed desorption (CO2‐TPD). The results have shown that the specific surface area and the number of active base sites are the main factors that are affecting the catalytic efficiency. Among the series of as‐prepared catalysts, 10BaO/γ‐Al2O3 had improved catalytic performance. Based on the obtained results for the characterization of catalysts, the increased catalytic activity could be mainly attributed to the increase in base strength resulting from BaO loading onto the surface of γ‐Al2O3. Under optimized conditions, 98.4% conversion of 1,3‐DCH and approximately 90% of ECH selectivity were achieved using 10BaO/γ‐Al2O3 with a reaction temperature of 270°C. During the reaction process, the catalytic activity of 10BaO/γ‐Al2O3 remained consistently high, and its catalytic stability was excellent.

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Continuous dehydrochlorination of 1,3-dichloropropan-2-ol to epichlorohydrin: process parameters and by-products formation

Cited by 8 publications

References 10 publications

Technological Parameters of Dehydrochlorination of 1,3-Dichloropropan-2-ol to Epichlorohydrin

Technological Parameters of Dehydrochlorination of 1,3-Dichloropropan-2-ol to Epichlorohydrin

Preparation and Uses of Chlorinated Glycerol Derivatives

Synthesis of epichlorohydrin from 1,3‐dichlorohydrin with solid catalysts using γ‐Al₂O₃ as carrier material

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Continuous dehydrochlorination of 1,3-dichloropropan-2-ol to epichlorohydrin: process parameters and by-products formation

Cited by 8 publications

References 10 publications

Technological Parameters of Dehydrochlorination of 1,3-Dichloropropan-2-ol to Epichlorohydrin

Technological Parameters of Dehydrochlorination of 1,3-Dichloropropan-2-ol to Epichlorohydrin

Preparation and Uses of Chlorinated Glycerol Derivatives

Synthesis of epichlorohydrin from 1,3‐dichlorohydrin with solid catalysts using γ‐Al2O3 as carrier material

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Synthesis of epichlorohydrin from 1,3‐dichlorohydrin with solid catalysts using γ‐Al₂O₃ as carrier material