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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Effect of pH Adjustment on Hexane Extract Composition at Liquid-Liquid Etraction
 Rousková, Milena ; Heyberger, Aleš ; Tříska, Jan ; Cvengroš, J. ; Kleinová, A.
Tall soap is a by-product of the sulphate process in pulp and paper production. In the Czech Republic it is utilized only as an energy source. It can serve also as a source of valuable components, e.g. phytosterols, which have positive effect on human health (decreasing of cholesterol content in blood, cardiovascular diseases, some types of cancer etc.). These substances can be separated by liquid-liquid extraction. Its applicability is limited by high content of emulsifiers in the raw material. It can be eliminated by decreasing the pH of the tall soap solution by mineral acid. This partial acidification has a positive effect on both hydrodynamics of the extraction process and the increase of distribution coefficients of individual compound groups, which can affect the composition of the output phases. Further experiments were carried out to refine phytosterols by the use of wiped-film molecular evaporator. Two different levels of pH of processed tall soap were used.
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Recovery of Phytosterols from Tall Soap Using Liquid-Liquid Extraction
 Rousková, Milena ; Heyberger, Aleš ; Tříska, Jan
Tall soap is a side-product in the Kraft process of the paper and pulp production. The most frequently tall soap is processed in paper technology for chemicals recovery and as a fuel. It contains also phytosterols that have medically proved positive effect on human health, especially on cardiovascular diseases and some types of tumour illnesses. Phytosterols can be isolated from the mixture by either energy consuming distillation or by gentle liquid-liquid extraction. The topic of interest is focused on tall soap processing for phytosterols’ yield maximalization by application of special constructed device – vibrating plate extractor.
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