GROWTH-INHIBITORS AND PROMOTERS EXEMPLIFIED ON SOLUTION GROWTH OF PARAFFIN CRYSTALS

被引:50
作者
KERN, R [1 ]
DASSONVILLE, R [1 ]
机构
[1] UNIV AIX MARSEILLE 3,F-13288 MARSEILLE 09,FRANCE
关键词
D O I
10.1016/0022-0248(92)90129-7
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Additives, called also intentional impurities, act on crystal growth kinetics. Generally, they are very specific and some act as inhibitors, others as promoters. Paraffin solution growth is sensitive to organic additive molecules and especially to polymers. In the latter case, the same molecule is able to act both as an inhibitor and as a promoter, depending only on its degree of polymerisation m. Polyalkylacrylate with low m value slows down the precipitation kinetics of n-paraffins, with species forming mestable solid solutions. On the contrary, high m values promote the precipitation, provided the polymer crystallizes prior to paraffin precipitation. In this case the polymer crystals act as epitaxial seeds, leading to paraffin crystal agglomerates of large size. This versatility of some polymers is of great help in industrial processes where paraffin crystals are involved.
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收藏
页码:191 / 203
页数:13
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