GB1026675A - Process and apparatus for the production of sodium tripolyphosphate of the low temperature form - Google Patents

Process and apparatus for the production of sodium tripolyphosphate of the low temperature form

Info

Publication number
GB1026675A
GB1026675A GB47917/62A GB4791762A GB1026675A GB 1026675 A GB1026675 A GB 1026675A GB 47917/62 A GB47917/62 A GB 47917/62A GB 4791762 A GB4791762 A GB 4791762A GB 1026675 A GB1026675 A GB 1026675A
Authority
GB
United Kingdom
Prior art keywords
gases
furnace
stage
mixed
calcining
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
GB47917/62A
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.)
Buttner Werke AG
Original Assignee
Buttner Werke AG
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
Application filed by Buttner Werke AG filed Critical Buttner Werke AG
Publication of GB1026675A publication Critical patent/GB1026675A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C01B25/40—Polyphosphates
    • C01B25/41—Polyphosphates of alkali metals
    • C01B25/412—Preparation from alkali metal orthophosphates
    • C01B25/414—Apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

<PICT:1026675/C1/1> The low temperature form (form II) of sodium tripolyphosphate is produced in two treatment stages, viz.:-(i) solutions of mixed orthophosphate are dried to give an intermediate solid, and (ii) said solid is calcined with hot gases, said gases being furnace gases which are brought to a relative humidity of at least 16%, by being mixed with re-cycled process gases, before being utilized in the calcining stage. Exhaust gases are removed from the recycling circuit through the calcining stage and used along with other furnace gases for heating the first or drying stage. In the Figure, 1 represents the first treatment stage an atomizing drier fed by a solution of mixed orthophosphates which is evaporated with furnace gases from furnace 2 which gases are cooled to a desired temperature, e.g. 400 DEG C., in a chamber 3 by being mixed with air and some of the exhaust gases from the calcining stage from pipe 15. The solid product from 1 is lead by line 7 into the plate oven 8 where it is calcined by gases from furnace 9 which are brought to a desired temperature and humidity, e.g. 500 DEG C. and 20-25% relative humidity, in chamber 14 by being mixed, via line 13, with exhaust gases from oven 8 which have been cleaned in dust-separator 12. Since the gases from line 13 may still have a temperature of, for example 400 DEG C., only a small amount of furnace gas is required to produce the desired calcining temperature, but the quantity is also governed by the requirements of humidity, and mixtures containing at least three and preferably at least four to six times as much exhaust gas as furnace gas have been found suitable. To provide a suitable calcining atmosphere on starting up the process, steam is introduced into the furnace gases from line 16. The exhaust gases from the first stage (evaporator 1) are cleaned in dust separator 4 and pumped via pump 5 to concentrator 6 where their waste heat is utilized. One furnace may, if desired, replace the two furnaces 2 and 9, with appropriate division of the furnace gases to feed the two treatment stages.
GB47917/62A 1961-12-20 1962-12-19 Process and apparatus for the production of sodium tripolyphosphate of the low temperature form Expired GB1026675A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB65271A DE1147205B (en) 1961-12-20 1961-12-20 Process for the preparation of sodium tripolyphosphate of the low temperature form

Publications (1)

Publication Number Publication Date
GB1026675A true GB1026675A (en) 1966-04-20

Family

ID=6974710

Family Applications (1)

Application Number Title Priority Date Filing Date
GB47917/62A Expired GB1026675A (en) 1961-12-20 1962-12-19 Process and apparatus for the production of sodium tripolyphosphate of the low temperature form

Country Status (2)

Country Link
DE (1) DE1147205B (en)
GB (1) GB1026675A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993734A (en) * 1973-07-30 1976-11-23 Rhone-Progil Process for the manufacture of alkali metal polyphosphates
US5955047A (en) * 1997-08-05 1999-09-21 Ajinomoto Co., Inc. Process for producing alkali metal polyphosphates

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108706563B (en) * 2018-06-27 2021-09-07 湖北兴发化工集团股份有限公司 Production method of ultralow I type sodium tripolyphosphate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993734A (en) * 1973-07-30 1976-11-23 Rhone-Progil Process for the manufacture of alkali metal polyphosphates
US5955047A (en) * 1997-08-05 1999-09-21 Ajinomoto Co., Inc. Process for producing alkali metal polyphosphates

Also Published As

Publication number Publication date
DE1147205B (en) 1963-04-18

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