Patents Assigned to Israel Chemicals Ltd.
Abstract: The invention relates to a combined process for the manufacture of feed grade dicalcium phosphate and pure phosphoric acid. The process comprises the reaction of an excess of …
US20070036704A1
A new and useful method of simultaneously producing and granulating anhydrous dicalcium phosphate is provided. Such a method entails the reaction of concentrated phosphoric acid with a powdered material of lime and/or calcium carbonate in substantially equal stoichiometric amounts, with subsequent, mixing, drying, milling, and sieving to provide the correct target …
US3467495A
PREPARATION 0F CALCIUM PHOSPHATES Filed Dec. 23, 1965 fwzfe for@ Jaya/ecris f'e/ssazz Unted States Patent U.S. 'CL 23-108 12 Claims ABSTRACT 0F THE DISCLOSURE A granular calcium phosphate product, which may be monocalcium phosphate, dicalcium phosphate or mixtures thereof, is produced by reacting at a temperature of about 130 to 200 …
US Patent for Preparation of dicalcium phosphate from …
Bridger (U.S. Letters Patent No. 3,011,888) shows that dicalcium phosphate may be prepared, without the use of excess acid, by treating phosphate rock with water and phosphoric acid, …
Treatment of commercial dicalcium phosphate
a process which comprises thoroughly incorporating together commercial dicalcium phosphate, which initially contains substantial traces oi mono-calcium phosphate, with an inorganic agent which is a chemical compound of a metal selected from the group consisting of alkali metals and alkaline earth metals, which agent is capable of neutralizing all of said monocalcium …
Manufacture of dicalcium phosphate dihydrate
dicalcium phosphate phosphate dihydrate dihydrate dicalcium Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) ... Publication of CA729532A publication Critical patent ...
Processes for the manufacture of feed-grade dicalcium phosphate …
The invention relates to a combined process for the manufacture of feed grade dicalcium phosphate and pure phosphoric acid. The process comprises the reaction of an excess of phosphate rock with aqueous solutions of a mineral acid selected from hydrochloric acid, phosphoric acid and nitric acid, characterized by the fact that the free acidity of the dissolution …
Use of dicalcium phosphate anhydride powder
the dicalcium phosphate anhydride powder used in accordance with the invention is distinguished by a particularly high bulk weight and, in spite of the relatively high degree of fineness, by a very good trickle flow characteristic. For that reason this powder is particularly suitable for direct tabletting without preceding granulation and introduces a larger amount of …
US5427756A
the undesirable after-thickening can be largely avoided in the short-term process described at the outset if, after stabilization has been carried out with the dimagnesium phosphate trihydrate (DMP-T) precipitated onto the DCP-D, 0.2 to 0.6% by weight of tetrasodium pyrophosphate, calculated with respect to the dicalcium phosphate dihydrate precipitated in the reaction …
US Patent for Process for the production of granulated …
In U.S. Pat. No. 3,467,495, a process is disclosed for producing granulated calcium phosphates, also including dicalcium phosphate, by carrying out the reaction of phosphoric acid with calcium carbonate or calcium hydroxide in a kneader, using a 2.5 to 10 fold amount of a …
Patents Assigned to Israel Chemicals Ltd.
Justia - Patents - Patents and Patent Application Resources. Abstract: The invention relates to a combined process for the manufacture of feed grade dicalcium phosphate and pure phosphoric acid. The process comprises the reaction of an excess of phosphate rock with aqueous solutions of a mineral acid selected from hydrochloric acid, phosphoric acid and nitric acid, …
US4828823A
dentifrice compositions e.g., toothpastes, today comprise four or more ingredients essential for effectiveness: (1) a water-soluble fluoride compound (such as sodium monofluorophosphate) as an anti-cariogenic agent; (2) a dispersant comprising water; (3) dicalcium phosphate dihydrate (hereinafter DCPD) as a polishing agent; (4) humectant, such as glycerine or sorbitol; (5) one …
US4891198A
Priority to US06/894,609 priority Critical patent/US4891198A/en Priority to CA000542393A priority patent/CA1328189C/en ... (dicalcium phosphate) present in the final product is related to the amount of hydroxyapatite present. The formation of hydroxyapatite requires three TCP molecules plus an addition of calcium hydroxide ...
The Use of Calcium Phosphates in Cosmetics, State of the …
Synthetic OCP can be obtained by wet precipitation at neutral or mildly acidic pH or by the hydrolysis of α-TCP or dicalcium phosphate . Interestingly, the Ca/P molar ratio of OCP (1.33) is variable and can change according to the quantity of calcium present in the structure. ... List of patents about calcium phosphate as skin cleansers. Ref ...
Dicalcium phosphate as gum base filler
Dicalcium phosphate used as a gum base filler in a food acid-containing chewing gum, for instance, a fruit flavor gum, yields a stable product without compromising the quality of taste or texture. That is, the advantages over other filler materials traditionally used in the art, is that it combines the excellent chew properties with stability and flavor release characteristics which …
Process for the production of granulated dicalcium phosphate …
A process is disclosed for the production of granulated dicalcium phosphate dihydrate from fine-grained, powered dicalcium phosphate dihydrate, wherein 80 t0 95% of dicalcium phosphate dihydrate with a grain size of less than 120 μm and 20 to 5% of calcium hydroxide with a grain size of less than 120 μm are dry mixed and continuously sprayed and granulated in a fluidized …
Manufacture of dicalcium phosphate dihydrate
Dicalcium phosphate dihydrate, CaHPO4 2H2O, is produced from phosphoric acid and/or a phosphoric acid salt, a calcium compound and, if desired, a basic compound, by a process comprising introducing the calcium compound and the phosphoric acid and/or phosphoric acid salt, in the presence of water, into a reactor, and rapidly and intimately mixing them therein at …
USE OF DICALCIUM PHOSPHATE ANHYDRIDE POWDER
CROSS-REFERENCE TO RELATED APPLICATIONS. This application is a continuation of U.S. patent application Ser. No. 10/332,106 filed Aug. 15, 2003 entitled USE OF DICALCIUM PHOSPHATE ANHYDRIDE POWDER, which is a National Stage Entry of International Application No. PCT/DE01/02484 filed Jun. 29, 2001, published as WO 02/02082 …
Eggshell derived monocalcium and dicalcium phosphate
A method of producing the product elicits monocalcium phosphate and/or dicalcium phosphate from a combination of dried eggshell waste and phosphoric acid, using water as a catalyst. US6649201B2 - Eggshell derived monocalcium and dicalcium phosphate - Google Patents ... Priority to US10/050,746 priority Critical patent/US6649201B2/en
Use of dicalcium phosphate anhydride powder
The invention relates to dicalcium phosphate anhydride powder, at least 50 wt. % thereof having a particle size of between 45 and 150 μm, a maximum of 50 wt. % having a particle size of <45 μm, and a maximum of 5 wt. % having a particle size of >150 μm. Said powder also exhibits a bulk density of 1000 to 5000 g/l and a specific surface area of <5 m2/g, and is …
Production of feed grade dicalcium phosphate
the separatedhydrolysis liquidcontaining a high ratio of P205 to iiuorine is treated with such a quantity of a base such as pulverized limestone or hydrated lime that the phosphate contained in the hydrolysissoluvtion is precipitated as dicalciurn phosphate. It has been ascertained that at a pH of about 4.5 most of the phosphate in the solution is precipitated as dicalcium phosphate.
Dicalcium phosphate manufacture
U.S. Pat. Nos. 3,919,395 and 4,012,491 have provided processes for the manufacture of dicalcium phosphate using dilute mineral acids to digest a wide range of phosphate rock. …
Method for preparation of dicalcium phosphate
Anhydrous dicalcium phosphate having an assay of at least 90 percent by weight and composed of particles, a major proportion of which have a particle size of from about 0.1 to 1.0 microns and a specific surface area of at least 10 square meters per gram is prepared by adding well dispersed, substantially dry calcium oxide or calcium hydroxide to phosphoric acid having …
GB782177A
Fluoride is removed in the preparation of dicalcium phosphate from wet process phosphoric acid by neutralizing the acid with an alkaline compound of calcium, e.g. lime or calcium carbonate, to a pH range 2.9-3.1; removing the precipitate, which is mainly fluoride; and then neutralizing the residual acid to precipitate dicalcium phosphate.
WO2001089990A1
Definitions. This invention relates to the production of dicalcium phosphate (Ca(H 2 PO ) 2 ) or monocalcium phosphate (CaHPO 4 ) from a source of phosphate, generally a phosphate ore, and typically one containing a significant amount of fluoride. More particularly, the invention relates to process in which a high recovery of phosphate can be achieved whilst fluoride …
US4154799A
dicalcium phosphate is produced from rock phosphate by continuously feeding finely divided phosphate ore, sulfuric acid, and sea water to a first mixing zone and mixing them to form a slurry, the quantity of sulfuric acid in sea water charged being about equal to six equivalents of acid per mold of P 2 O 5 content of the rock phosphate and about 3% by weight chloride per …
Dicalcium phosphate dihydrate patented technology …
This page includes the patent name, patent number, legal status, invention/applicant, technical efficacy and accompanying drawings of Dicalcium phosphate dihydrate-related invention patents and utility model patents, which can be searched for their Dicalcium phosphate dihydrate-related patent result data, and can also be analyzed for Dicalcium phosphate …
Process for stabilization of dicalcium phosphate
An improved process for the preparation of stabilized dicalcium phosphate dihydrate wherein an aqueous mixture containing dicalcium phosphate dihydrate is treated with a tetra-alkali metal pyrophosphate which comprises (a) adding a stabilizing amountof the tetra-alkali metal pyrophosphate to said aqueous mixture at a pH from about 5.5 to about 6.5 for said mixture; …
Use of dicalcium phosphate anhydride powder
CROSS-REFERENCE TO RELATED APPLICATIONS. This application is a continuation of U.S. patent application Ser. No. 10/332,106 filed Aug. 15, 2003 now U.S. Pat. No. 7,691,410 entitled USE OF DICALCIUM PHOSPHATE ANHYDRIDE POWDER, which is a National Stage Entry of International Application No. PCT/DE01/02484 filed Jun. 29, 2001, …
WO2004076348A1
This invention relates to a process for the preparation of feed grade dicalcium phosphate substantially free of fluorides from a source containing monocalcium phosphate such as simple super phosphate, concentrated super phosphate or fertilizer grade phosphate which comprises the steps of (a) leaching out soluble monocalcium phosphate therefrom with water or recycle …