The influence of adsorption on the crystallisation of sucrose from impure solutions

✍ Scribed by Coalstad, S. E.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1946
• Weight: 390 KB
• Volume: 65
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000650705

✦ Synopsis

Abstract

For many years now the purity of raw‐sugar‐mill molasses has been steady within certain limits and analyses of 60 years ago show marked .similarity with those of to‐day. The reason for this has been obscure, but the writer has now shown that the failure of sucrose to crystallise further from the strongly supersaturated solution (molasses) is duo to the presence of surface activo impurities being adsorbed by tho surfaces of the crystals and thus inhibiting their growth. When these impurities arc removed by the use of excess adsorbent carbon, the sucrose will crystallise practically completely. The reducing sugar‐ash ratio is shown to be unfounded ns a criterion for judging molasses exhaustion.