Bleaching Earths

We are experts in bleaching earths made from highly adsorptive clays

Over the years, we have developed a full range of bleaching earths. This range includes Natural Bleaching Earths (NABE), Surface Modified Bleaching Earths (SMBE) and High Activated Grades (HPBE).

We are experts in bleaching earths based on highly adsorptive clays (bentonite, sepiolite and attapulgite) formed by small particles with highly porous inner structure, which is very active in terms of interaction with other particles organic compounds.

It is essential to understand that depending on the ingredients incorporated in the Bleaching Earth formulas, some characteristics will vary, such as the level of absorption achieved or their capacity to absorb certain undesirable compounds in the oil refining process.

This may seem obvious, but on many occasions this is not taken into account when choosing a Bleaching Earth product. The different minerals used when developing our bleaching earths allow us to provide products with the different absorption rates and adsorption characteristics needed for each feedstock.

Edible Oils Bleaching

TOLSA Industrial Products has its bleaching earths portfolio branded as MINCLEAR®, specialising in the edible oil purification process.

Our variety of products go from natural or thermal/physically treated bleaching earths to soft acid-treated or acid leached bleaching earths. This, together with our capacity to manufacture additives using different clay minerals, allows us to provide the most efficient solution for the purification of each kind of vegetable oil: Palm, soybean, canola, coconut, rapeseed, sunflower, pomace and olive oils, among others.

Benefits:

  • Reduction or removal of colour compounds, Chlorophyll and other pigments.
  • Removal of oxidation compounds, soaps, phospholipids and metals, providing the level of stability required in final oils.
  • Prevention of oil degradation through the adsorption of some molecules, improving flavour and taste.
  • Excellent filtration rate, reducing the time needed for the filtration stage.
  • Low values in oil retention, reducing oil losses during the purification process.

Biofuels Filtration

Biofuels are chemically mono-alkyl esters of fatty acids, obtained mainly from vegetable oil or animal fats such as used cooking oils (UCO), technical corn oil (TCO), Brassica rapeseed oil and fatty acids (DFA), among others.

Benefits:

  • High efficiency removing impurities, fines, etc.
  • High capacity removing metals (P, Ca, Al, Fe, etc.).
  • High filtration rate capacity: Reducing the time required in the filtration stage.
  • Natural grades reduce the acidity of the sludge, reducing recycling problems compared to acid-activated clays.
  • Low values of feedstock retention in clay, maximising production.

Paraffins & Waxes Bleaching

Paraffins and waxes are raw materials derived from petroleum, coal or shale. These must go through bleaching and purification processes before they’re used in other industrial applications, including food industry purposes.

Based on selected clay minerals, we have developed a complete range of natural and activated bleaching earths products to reduce or remove undesired colour, odour, and PHA’s (Poly Aromatic Hydrocarbons) from paraffins and waxes.

Benefits:

  • Thanks to their high porosity and surface area, our products act as an efficient absorbent with the capacity to remove undesired traits such as colloidal suspensions, oxidation products, organic acids, and aromatic hydrocarbons heterocycles, among other impurities.

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