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process for the fractionation of the rural development policy. between piromellitica desublimazione
process for the fractionation of the rural development policy. between piromellitica desublimazione
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机译:农村发展政策分割过程。在吡美洛替尼之间
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摘要
A process for the fractional desublimation of pyromellitic acid dianhydride in the form of free-flowing crystals which comprises reducing a reaction gas containing pyromellitic acid dianhydride produced by a chemical reaction which also produces by-products, to a temperature above the thaw point of the by-products but below the desublimation point of pyromellitic acid dianhydride by means of a smooth thermostaticized cooling surface, directing the reaction gases at maximal flow velocities of 3 m/sec parallelly to the cooling surface and separating the fraction of crystals not adhering to the surface.
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机译:以自由流动的晶体形式对部分均苯四甲酸二酐进行部分升华的方法,该方法包括将含有通过化学反应产生的含有均苯四酸二酐的反应气体还原到也高于副产物解冻点的温度。 -产物,但通过光滑的恒温冷却表面使均苯四酸二酐的升华点以下,将反应气体以最大流速3 m / sec平行于冷却表面导引,并分离出不附着在表面上的晶体部分。
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