Fatty pitch is a by-product of soap manufacturing, obtained after distillation of fatty acids formed during the splitting of solid fats.
Composition and Appearance The main component is fatty acids. Impurities include unsplit glycerides, glycerin, and other substances. It appears as a thick, viscous mass of varying consistency (from liquid to solid), ranging in color from dark brown to black. Physical properties may vary depending on feedstock and production technology.
Production Methods Fatty pitch is formed as:
the still residue from distillation of fatty acids from vegetable oil soapstocks and technical fats,
a by-product of crude glycerin distillation at fat-and-oil processing plants.
Parameter
Specification
Color
Dark brown to black
Odor
Characteristic, without foreign odor
Appearance
Thick, grease-like mass
Acid number, mg KOH/g
30
Total fat content, %
96–98
Moisture and volatile matter, %
2.0–4.0
Pour point, °C, max.
34
Additional specifications:
Acid number: min. 50–70 mg KOH/g
Saponification number: min. 140 mg KOH/g
Fatty acid titer (pour point): max. 23 °C
Moisture and volatiles: max. 5 %
Ash content: max. 1 %
Storage conditions: ≤ 50 °C in containers resistant to fatty acids
Shelf life: 12 months
Applications Fatty pitch is used in various industries: • In the production of cutting and cooling fluids for metal machining. In such formulations, fatty pitches can be included as a component together with other substances (sodium hydroxide, sodium oleate, sodium tripolyphosphate, etc.). • In road construction. Secondary pitches, including fatty pitches, are used to activate mineral filler in asphalt concrete mixes, as well as an emulsifier in road emulsions. • For dewatering clay-salt waste from potash fertilizer production. An emulsion of fatty pitch in a trisodium phosphate solution combined with PAA can be used for deep dewatering of such wastes. • As a component in certain binding materials. For example, fatty pitch may be part of a binder based on pond acid pitch as one of the plasticizer components. In some cases, fatty pitch is regarded as a production waste intended for direct sale, rather than as raw material for further processing within the fat-and-oil industry.
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