GB832011A - Granular potassium metaphosphate - Google Patents

Granular potassium metaphosphate

Info

Publication number
GB832011A
GB832011A GB2447157A GB2447157A GB832011A GB 832011 A GB832011 A GB 832011A GB 2447157 A GB2447157 A GB 2447157A GB 2447157 A GB2447157 A GB 2447157A GB 832011 A GB832011 A GB 832011A
Authority
GB
United Kingdom
Prior art keywords
phosphoric acid
potassium
acid
potassium chloride
inert particles
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.)
Expired
Application number
GB2447157A
Inventor
Bernard Raistrick
John Stewart Raitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scottish Agricultural Industries Ltd
Original Assignee
Scottish Agricultural Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE578626D priority Critical patent/BE578626A/xx
Priority to NL110738D priority patent/NL110738C/xx
Priority to NL230130D priority patent/NL230130A/xx
Application filed by Scottish Agricultural Industries Ltd filed Critical Scottish Agricultural Industries Ltd
Priority to GB2447157A priority patent/GB832011A/en
Priority to FR771691A priority patent/FR1262575A/en
Priority to DES59265A priority patent/DE1109716B/en
Publication of GB832011A publication Critical patent/GB832011A/en
Priority to FR838234A priority patent/FR78825E/en
Priority to ES0270600A priority patent/ES270600A3/en
Priority to NL6511994A priority patent/NL6511994A/xx
Priority to FR31626A priority patent/FR88879E/en
Priority to DE19651592757 priority patent/DE1592757A1/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B13/00—Fertilisers produced by pyrogenic processes from phosphatic materials
    • C05B13/06—Alkali and alkaline earth meta- or polyphosphate fertilisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/38—Condensed phosphates
    • C01B25/44—Metaphosphates
    • C01B25/445—Metaphosphates of alkali metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Fertilizers (AREA)

Abstract

<PICT:0832011/III/1> Potassium metaphosphate, (KPO3)n), is prepared by contacting potassium chloride and phosphoric acid at a temperature below the fusion point of the product in the presence of a moving mass of inert particles, whereby the potassium metaphosphate is prepared in granular form. The reactants may be added separately to the inert particles or may be pre-mixed. Reaction temperatures are normally between 350 DEG and 600 DEG C. The inert particles may be constituted by potassium metaphosphate itself or by potassium chloride or sulphate. The phosphoric acid employed may be orthophosphoric, pyro-phosphoric or phosphoric acid having an enhanced P2O5 content due to the addition of phosphorus pentoxide. If it is desired to increase the K2O : P2O5 ratio, sulphuric acid may be added to the phosphoric acid but normally the ratio will be unity. Hydrochloric acid is evolved during the reaction and may be recovered. As shown in the Figure, a slurry of phosphoric acid and potassium sulphate is added through a line 2 to a reactor 1 which contains hot recycled material at a temperature of 500 DEG C. entering through line 3. The material leaves the kiln at 200 DEG C. in a freeflowing condition and is passed to a heated rotary kiln 5 where the temperature is raised again to 500 DEG C. Hydrochloric acid is withdrawn through lines 12 and 13. A portion of the material leaving the kiln is recycled to line 3 but the major portion passes to a cooler 6 from which it is passed to a screen 8 which separates the products, fines and oversize. The desired quantity is recycled through line 11 and recycle heater 4 back to the feed shoot 3. In order to produce a relatively pure hydrochloric acid the phosphoric acid employed may be defluorinated by adding part of the potassium chloride to the acid, thereby precipitating potassium silicofluoride which is removed by filtration, and thereafter reacting the purified acid with further potassium chloride.ALSO:Granular potassium metaphosphate, (KPO3)n is prepared by contacting potassium chloride and phosphoric acid at a temperature below the fusion point of the product in the presence of a moving mass of inert particles, which may be potassium chloride, sulphate or metaphosphate. The reactants may be added separately to the inert particles or may be pre-mixed. Reaction temperature are normally between 350 and 600 DEG C. The phosphoric acid employed may be orthophosphoric, pyro-phosphoric or phosphoric acid having an enhanced P2O5 content due to the addition of phosphorus pentoxide. If it is desired to increase the K2O: P2O5 ratio, sulphuric acid may be added to the phosphoric acid but normally the ratio will be unity.
GB2447157A 1957-08-01 1957-08-01 Granular potassium metaphosphate Expired GB832011A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
BE578626D BE578626A (en) 1957-08-01
NL110738D NL110738C (en) 1957-08-01
NL230130D NL230130A (en) 1957-08-01
GB2447157A GB832011A (en) 1957-08-01 1957-08-01 Granular potassium metaphosphate
DES59265A DE1109716B (en) 1957-08-01 1958-08-01 Process for the production of granular fertilizers containing potassium metaphosphate
FR771691A FR1262575A (en) 1957-08-01 1958-08-01 Granulated fertilizer
FR838234A FR78825E (en) 1957-08-01 1960-09-09 Granulated fertilizer
ES0270600A ES270600A3 (en) 1957-08-01 1961-09-19 Granular potassium metaphosphate
NL6511994A NL6511994A (en) 1957-08-01 1965-09-15
FR31626A FR88879E (en) 1957-08-01 1965-09-16 Granulated fertilizer
DE19651592757 DE1592757A1 (en) 1957-08-01 1965-09-16 Process for the production of granular fertilizers containing potassium metaphosphate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2447157A GB832011A (en) 1957-08-01 1957-08-01 Granular potassium metaphosphate

Publications (1)

Publication Number Publication Date
GB832011A true GB832011A (en) 1960-04-06

Family

ID=10212222

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2447157A Expired GB832011A (en) 1957-08-01 1957-08-01 Granular potassium metaphosphate

Country Status (5)

Country Link
BE (1) BE578626A (en)
DE (1) DE1109716B (en)
ES (1) ES270600A3 (en)
GB (1) GB832011A (en)
NL (2) NL110738C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205120B (en) * 1961-01-19 1965-11-18 Kalk Chemische Fabrik Gmbh Process for the production of granulated PK fertilizers
DE1266317B (en) * 1964-05-02 1968-04-18 Wintershall Ag Phosphate-potash fertilizers with nutrient ratios of PO: KO such as 1: 1.3 and greater, especially 1: 1.5 to 2, and with about 66 to 90 percent of the total KO content as slowly soluble KO from compounds with Lags-soluble KO and from water-soluble potassium salts
US3414375A (en) * 1963-08-07 1968-12-03 Prod Chim Du Limbourg Two-stage process for the preparation of potassium metaphosphate
US4824649A (en) * 1987-08-31 1989-04-25 Stauffer Chemical Company High viscosity potassium metaphosphate
US5443808A (en) * 1990-04-06 1995-08-22 Kemira Oy Method of producing alkali metal phosphate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1095318A (en) * 1964-07-14

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR643521A (en) * 1927-04-08 1928-09-18 Charbons Actifs Edouard Urbain Simultaneous preparation of hydrochloric acid and potassium phosphate
FR721929A (en) * 1930-10-13 1932-03-09 Ig Farbenindustrie Ag Process for the production of alkaline metaphosphates
US2288418A (en) * 1939-11-01 1942-06-30 Hall Lab Inc Manufacture of mixed phosphates

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205120B (en) * 1961-01-19 1965-11-18 Kalk Chemische Fabrik Gmbh Process for the production of granulated PK fertilizers
US3414375A (en) * 1963-08-07 1968-12-03 Prod Chim Du Limbourg Two-stage process for the preparation of potassium metaphosphate
DE1266317B (en) * 1964-05-02 1968-04-18 Wintershall Ag Phosphate-potash fertilizers with nutrient ratios of PO: KO such as 1: 1.3 and greater, especially 1: 1.5 to 2, and with about 66 to 90 percent of the total KO content as slowly soluble KO from compounds with Lags-soluble KO and from water-soluble potassium salts
US4824649A (en) * 1987-08-31 1989-04-25 Stauffer Chemical Company High viscosity potassium metaphosphate
US5443808A (en) * 1990-04-06 1995-08-22 Kemira Oy Method of producing alkali metal phosphate

Also Published As

Publication number Publication date
ES270600A3 (en) 1962-01-01
DE1109716B (en) 1961-06-29
BE578626A (en)
NL110738C (en)
NL230130A (en)

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