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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Solvent-free slack wax de-oiling—Physical limits
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Solvent-free slack wax de-oiling—Physical limits

机译：无溶剂粗蜡de-oiling-Physical限制

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摘要

In order to get more knowledge about the fundamentals of solvent-free slack wax de-oiling by melt crystallization, investigations on multicomponent paraffin waxes have been performed, which included X-ray powder diffraction and optical microscopy. The tested neutral oil and medium slack waxes consisted mainly of n- and iso-paraffms with different chain lengths. The results suggest that only n-paraffins formed orthorhombic crystals at room temperature with c-axes corresponding to the average chain length of the paraffin waxes. The crystals were surrounded by less crystalline, rather amorphous, solid phase containing mainly iso-paraffms. The typical solid-solid transition of crystal lattice in neutral oil slack waxes from orthorhombic to hexagonal system at temperatures below melting point increases the mobility of the low melting components. This is the key for the applicability of the melt crystallization process. Investigations on sweating suggest a strong influence of the n-paraffins content on mechanical stability of crystal structures and on the separation efficiency of sweating.
机译：为了获得更多的知识无溶剂粗蜡基础de-oiling通过熔体结晶,调查多组分石蜡执行,包括x射线粉末衍射光学显微镜。中性油和松弛蜡由媒介主要是n -和iso-paraffms不同链的长度。n-paraffins形成斜方晶系的晶体在室温温度与c-axes对应石蜡的平均链长。晶体是水晶,环绕而非晶态,包含主要的固相iso-paraffms。中性油的晶格松弛蜡斜方晶系的六角系统温度低于熔点就增加了流动的低熔点组件。关键的适用性融化结晶的过程。出汗建议强烈的影响n-paraffins机械稳定性的内容晶体结构和分离出汗的效率。

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