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 formInfo
- 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
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.
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)
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)
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 |
-
1961
- 1961-12-20 DE DEB65271A patent/DE1147205B/en active Pending
-
1962
- 1962-12-19 GB GB47917/62A patent/GB1026675A/en not_active Expired
Cited By (2)
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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