615-52-1Relevant academic research and scientific papers
Method for continuously producing diethyl oxalate
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Paragraph 0077-0091, (2021/06/21)
The invention provides a method for continuously producing diethyl oxalate. The method comprises the following steps: A) adding dimethyl oxalate, alcohol and a catalyst into a first reaction kettle, carrying out ester exchange reaction, continuously and sequentially feeding reaction liquid into a second reaction kettle, a third reaction kettle and a fourth reaction kettle which are connected with the first reaction kettle in series, and continuously carrying out ester exchange reaction; and B) sequentially introducing the reaction liquid in the fourth reaction kettle into a dealcoholization tower, a byproduct removal tower and a product tower to obtain diethyl oxalate at the top of the product tower. The method has the advantages that: 1) four-kettle continuous reaction is adopted, so that the reaction rate and the conversion rate are improved; 2) the side reaction is less, the byproduct is single, the byproduct can be continuously reacted to obtain the product, the atom utilization rate is close to 100%, the product purity reaches 99.99%, and the purity of the co-produced methanol is 99% or above; and 3) environmental protection advantage: basically no three wastes are generated, the catalyst is recycled, and the method belongs to a clean production process and meets environmental protection requirements.
Method for synthesizing symmetric oxalate by using dimethyl oxalate and alcohols in one step
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Paragraph 0033-0042, (2019/01/06)
The invention relates to a method for synthesizing symmetric oxalate, in particular to a method for synthesizing the symmetric oxalate by using dimethyl oxalate and alcohols in one step. The symmetricoxalate is synthesized by using the dimethyl oxalate and the high carbon alcohols such as ethanol, propanol, butanol and pentanol as reaction raw materials and by adopting a one-step synthesis method. A catalyst used in the method is a mesoporous-microporous composite multifunctional basic catalyst, and has the advantages that mesopores significantly improve the mass transfer efficiency, while micropores significantly enlarge the specific surface area of a carrier and improve the dispersion of an active center. 10% MgO-5% Al2O3-8% Fe2O3/Na-meso-Y is used as the catalyst, the raw material ethanol and the dimethyl oxalate are enabled to be subjected to reaction under the atmospheric pressure at the temperature of 100 DEG C under the condition that the space velocity is 2 h-1, wherein the molar ratio of the raw material ethanol to the dimethyl oxalate is equal to 20 to 1; the selectivity of the product diethyl oxalate is stabilized to be about 82%, and the steady state operation is performed for 1000h; the catalytic activity and the product selectivity are basically unchanged. The whole reaction path has the characteristics of being short in synthetic route, simple in process flow and high in raw material conversion rate and product selectivity, and enabling the catalyst to be stable and non-deactivated.
Synthesis and reactivity of bis(alkyloxalyl) and alkoxycarbonyl alkyloxalyl iron complexes and (R, R'=Me or Et): evidence for reductive elimination of oxalate
Laurent, Pascale,Salauen, Jean-Yves,Gall, Gwenaeelle Le,Sellin, Murielle,Abbayes, Herve des
, p. 175 - 184 (2007/10/02)
The new complexes cis- (R=Me or Et) and cis- (R,R'=Me, Et or i-Pr) have been synthesized.The bis-(alkyloxalyl) complexes decarbonylate at +12 deg C to their alkoxycarbonyl alkyloxalyl homologues.The latter decompo
