Pat.236394 Application of the waste acid KH2PO4 potassium phosphate for production of a granular multi-component fertilizer
Inventors: Andrzej Vogt, Stanisław Strzelecki, Sławomir Szafert, Mirosław Rakow, Stanisław Klesyk
Separating crude glycerine waste yields:
(a) solid acid potassium phosphate KH2PO4 slightly wetted with technical glycerol,
(b) a fraction containing waste ethyl ester, the so-called energy fraction, with about 55-60 % free fatty acids dissolved in it, which is an excellent diesel fuel that can be used for cogeneration of electricity and heat,
(c) crude technical bio-glycerine (95-98%).
The invention in question refers to the agricultural use of a valuable KP-type (Potassium-Phosphorous) component for plants, i.e. acid potassium phosphate KH2PO4. In addition, various substances containing microelements are added to the product thus created. This type of fertilizers have already been manufactured by a company from Morawica near Kielce, under the name KOMPLEKSOR®, and they are considered to be the first “intelligent fertilizers” releasing particular elements into the soil in quantities compliant with the needs of the fertilized plant.
GRANULATED COMPOUND FERTILISER
A very interesting method of utilising waste acid potassium phosphate (KH2PO4) generated during chemical recycling of the so-called glycerine fraction has been developed at the Faculty of Chemistry. This waste was used to produce a granulated compound fertiliser containing dolomite and/or calcium or magnesium carbonates and oxides and plant nutrients, especially phosphorus, potassium and trace elements as well as ash generated from the combustion of straw and/or biomass, with both potassium and phosphorus coming mainly from KH2PO4 acid potassium phosphate.
The glycerine fraction in question is post-production waste from the process of making methyl/ethyl biodiesel (FAME/FAEE) from various vegetable or animal fats, or from used or health-promoting ethyl esters of higher fatty acids obtained from linseed oil according to the simplest, and therefore cheapest, technology in the world. This technology was also developed at the Faculty of Chemistry and has been patented as an original technology guaranteeing the lowest possible cost of ester production while maintaining the highest product quality standards thanks to several innovative technological, process, and technical solutions.
The glycerine fraction itself is made up of glycerol emulsified with ethyl or methyl esters of higher fatty acids and, where the glycerine fraction is derived from the processing of vegetable oils, of various bioactive additives such as vitamins, phytosterides, phospholipids, etc.
