Abstract:

In this paper, the filtration process of FMEE prepared by calcium catalyst was studied. The viscosity of FMEE at different temperatures and gelation phase region of FMEE were measured, and the effects of sorbent type, dosage of adsorbent, types of filter aids, amount of filter aid and number of filter paper on the filtration effect were investigated. The optimal process was confirmed by filtration time, pH after filtration, particle size distribution and calcium ion content. The results show that FMEE has gel phase, which is serious with the mass fraction of 50%±5% at 20 ℃. When the mass fraction is 80%, the viscosity of FMEE decreases with the temperature increase, and the inflection point is at 70 ℃. When the adsorbent is citric acid and the mass fraction in the solution is 0.1%, the adsorption effect is better. When diatomite is used as the filter aid and the mass fraction in the solution is 0.2%, the filtration effect is the best. When the mesh number of filter paper is 500, the primary filtration yield reaches the maximum. Under the optimized process conditions, a clear and transparent solution with calcium ion content less than 10 mg/kg can be obtained, and the turbidity of filtrate can be less than 1 NTU.

Key words: fatty acid methyl ester ethoxylate, adsorbent, filter aid, filtration, particle size distribution