Purification of Polyether Polyols with Low Unsaturation

Abstract:

The purification of polyether polyols with low unsaturation was studied. The removal effect of residual double metal cyanide in the polyols by the methods of adsorption and precipitation-filtration is characterized by the residual concentration of the zinc and cobalt ions which is measured by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). Compared with precipitation-filtration, the method of adsorption was more practical and efficient for the purification of the polyols. And the optimum kind and amount of the adsorbent were obtained. The results showed that the combination of chelating fiber and attapulgus clay was the most favorable for the removal of zinc and cobalt ions and the appropriate weight ratio of chelating fiber and attapulgus clay was 1:1. The total concentration of zinc and cobalt ions can be reduced to lower than 1×10^-6. And the amount of the adsorbent added was 3.33% by the weight of the polyether polyols. And through Scanning Electron Spectroscopy (SEM) the morphology of the chelating fiber was characterized before and after adsorption.

• Periodical: Advanced Materials Research (Volumes 781-784)
• Pages: 2361-2365
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.781-784.2361
• Online since: September 2013
• Authors: Wei Hua Ma, Qin Zhong
• Keywords: Adsorption, Chelating Fiber, Polyether Polyols, Purification

References

[1] S. Chen, N. P. Xu, J. Shi. Structure and properties of polyether polyols catalyzed by Fe/Zn double metal cyanide complex catalyst. Progress in Organic Coatings. 49(2004): 125-129.

DOI: 10.1016/j.porgcoat.2003.08.021

[2] B. Le-Khac. Highly active double metal cyanide catalysts. US 6018017. January 25, (2000).

[3] T. Ostrowski, K. Harre, G. H. Grosch, W. Ju. Preparation of polyether polyols in the presence of a multimetal cyanide complex catalyst. US 7022884. April 4, (2006).

[4] I. Kim，J. T. Ahn，C. S. Ha, C. S. Yang, I. Park. Polymerization of propylene oxide by using double metal cyanide catalysts and the application to polyurethane elastomer. Polymer, 2003, 44：3417~3428.

DOI: 10.1016/s0032-3861(03)00226-x

[5] I. I. Miltiadis, F. B. Gert. Process for the production of inorganic-organic compositions. US 4355188. October 19, (1982).

[6] W. Takashi, T. Hiromitsu, D. Takao, K. Nobuaki. Method for purifying a polyoxyalkylene alcohol. US4987271. February 14, (1990).

[7] T. R. Jude. Method for purifying polyether polyols made with double metal cyanide catalysts. US 5416241. May 16, (1995).

[8] D. H. Stephen. Purification of polyols prepared using double metal cyanide complex catalysts. US4877906. October 31, (1989).

[9] H. Werner, M. D. Eward. Process for removing and regenerating a double metal cyanide (DMC) catalyst from a polymer polyol. US6806348. October 19, (2004).

[10] E. K. Lawrence, W. R. John. Process for removing double metal cyanide catalyst residues from a polyol. US 5099075. March 24, (1992).

[11] L. S. Jonathan. Recovery of double metal cyanide complex catalyst from a polymer. US 5010047. April 23, (1991).

[12] D. H. Stephen, H. H. Stephen. Purification of polyols prepared using double metal cyanide complex catalysts. US 4721818. January 26, (1988).

[13] M. M. Malaga，B. B. Montalvo. Process to purify polyether polyols. EP 03380158. 0. 2004-12-30.

[14] S. Li, Q. Y. Shu, Y. C. Cui. Process for purifying polyether polyols by ultrafiltration. CN1884340A. Dec 27, (2006).

[15] B. Le-khac. Foam-supported double metal cyanide catalysts for polyol synthesis. US5255565. June 11, (1996).

[16] H. G. Heinrich, L. Harald, L. Reinhard, J. Dieter, K. Ulrich. Supported double metal cyanide catalysts, method for producing them, and their use for producing polyether alcohols. US 6362126. Mar 26, (2002).