Size and morphology of benzoic acid crystals produced by drowning-out crystallisation

被引：49

作者：

Holmbäck, X ^{[1
]}

Rasmuson, ÅC ^{[1
]}

机构：

[1] Royal Inst Technol, Dept Chem Engn & Technol, S-10044 Stockholm, Sweden

来源：

JOURNAL OF CRYSTAL GROWTH | 1999年 / 198卷

关键词：

drowning-out crystallization; solubility of benzoic acid; attachment energy model; product characteristics; surface chemistry;

D O I：

10.1016/S0022-0248(98)01027-6

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Benzoic acid is crystallised from saturated ethanol-water solutions by adding water or an ethanol-water mixture in semi-batch experiments. The influence of precipitant addition rate, ethanol concentration in the bulk solution and ethanol concentration in the feed, have been studied. The product particles are characterised by microscopic determination of the projected area diameter and the aspect ratio. It is found that benzoic acid crystals grown from ethanol-water solutions range from needles to platelets. The mean size ranges from 69 to 218 mu m while the aspect ratio varies from 1.3 to 10.2. The influence of process variables on the product size and shape are discussed in terms of the influence of supersaturation and of the solvent composition. By attachment energy modelling, the surface chemistry is examined. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：780 / 788

页数：9

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