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United States Department of Agriculture

Agricultural Research Service

Title: Preparation of Sorbitol Citrate Polyesters by Reactive Extrusion

Authors
item Shogren, Randal
item Gonzalez, Sergio
item Willett, Julious
item Gravier, Daniel - FOLIA, INC.
item Swift, Graham - FOLIA, INC.

Research conducted cooperatively with:
item Folia, Inc

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: June 19, 2006
Publication Date: September 18, 2006
Citation: Shogren, R.L., Gonzalez, S.O., Willett, J.L., Gravier, D., Swift, G. 2006. Preparation of sorbitol citrate polyesters by reactive extrusion [abstract]. American Chemical Society. Paper No. 8.

Technical Abstract: Sorbitol citrates were prepared using a vented ZSK-30 twin-screw extruder as part of a program to develop bio-based, water soluble polycarboxylates. A Box-Behnken experimental design was used and included the variables sorbitol, citric acid, sodium citrate, temperature and feed rate. Extent of ester formation increased with increasing sorbitol, temperature and with decreasing feed rate. Weight average molecular weights by GPC ranged from 600 to 14,000 and increased with lower sodium, lower feed rates and higher temperatures. Sorbitol citrates inhibited crystallization of supersaturated CaCO3 and this activity increased with increasing citric acid content and increasing extent of reaction/molecular weight. This work suggests that reactive extrusion is an efficient and practical method to prepare low molecular weight, water soluble sorbitol citrate polyesters and that these could function as antiscalants in detergents and other applications.

Last Modified: 4/18/2014
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