CN1006057B - New crystallization process for diammonium phosphate without refrigeration and vapourization - Google Patents
New crystallization process for diammonium phosphate without refrigeration and vapourization Download PDFInfo
- Publication number
- CN1006057B CN1006057B CN88103797.4A CN88103797A CN1006057B CN 1006057 B CN1006057 B CN 1006057B CN 88103797 A CN88103797 A CN 88103797A CN 1006057 B CN1006057 B CN 1006057B
- Authority
- CN
- China
- Prior art keywords
- diammonium phosphate
- crystallization process
- crystallization
- present
- vapourization
- 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
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Abstract
The present invention relates to a method for producing crystalloid soluble diammonium phosphate. The present invention needs the technical conditions that an oversaturated state of NH3H3PO4H2O needs to be realized in a vertical crystallization tower so as to realize quick crystallization; the pH value of a crystallization material system ranges from 9 to 10.
Description
The present invention is crystalloid soluble phosphoric acid two ammonium working systems.
At present, in the world wide,, all adopt the slurry granulation method with regard to the production of diammonium phosphate, or the pipe reaction comminution granulation, used phosphoric acid by wet process concentration all adopts 40-54%P
2O
5, flow process process: pre-neutralization, secondary washing, ammoniation-granulation, drying, fragmentation, returning charge, operations such as cooling, facility investment is big, complex structure power consumption height is as TvA flow process Spain Kroes flow process or Chris Jacobs-many sections flow process.
The present invention is intended to develop present prior art method in addition, and crystallization features of DAP production method is simple in the hope of reaching equipment, the purpose that reduces cost.
Technological process of the present invention is: in two placed in-line coiled pipe spray coolers, carry out the secondary ammoniation of phosphoric acid successively, for the first time the propylhomoserin mole ratio is controlled at 0.6.For the second time be controlled at 1.4, temperature all is not higher than 75 ℃, and the solution after ammonification is sent in the vertical ammonification prilling tower that has a whipping appts again, and ammonification once more makes reaction system NH
3-H
3PO
4-H
2The pH value of O reaches between the 9-10, and ammonium phosphate is separated out with regard to crystallization, and cool off with cascade the outside of prilling tower, and the crystallization system promptly gets the diammonium phosphate crystalline product through centrifugation, and mother liquor is treated to be recycled.
The present invention is than the flow process of present TvA exploitation, and the advantage of Chris Jacobs-many sections flow process or Spain's Kroes flow process is that the used wet process acid of raw material phosphoric acid need not concentrate, and can directly use (22-33%P
2O
5), equipment is simple, builds easily, and the production process energy consumption is low, thereby has reduced production cost and facility investment.
It is very simple to implement the present invention, gets raw material acid (22-33%P
2O
5) 500 grams, liquefied ammonia 300 grams feed in the coiled pipe spray condenser by spinner-type flowmeter respectively, and the propylhomoserin mole ratio is controlled at 0.6 for the first time, it is 1.4 that the ammonia that feed the second time makes it control the propylhomoserin mole ratio on the basis of the ammonification first time, through the system NH of twice ammonia ratio
3-H
3PO
4-H
2O enters the interior ammonification of prilling tower and reaches between the 9-10 to pH, promptly has crystallization to form, and the centrifugation of crystallization system is promptly got the diammonium phosphate crystalline product.
Claims (1)
1, do not freeze, do not evaporate the diammonium phosphate new crystallization process, its crystalline characteristics is in vertical prilling tower, NH
3-H
3PO
4-H
2In the O system, the pH value produces between 9-10, and the realization of this pH value is that phosphoric acid is sent into behind secondary ammoniation in the prilling tower again, and ammonification is finished once more.The concentration of raw materials used acid is minimum to be 22%P
2O
5
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88103797.4A CN1006057B (en) | 1988-06-25 | 1988-06-25 | New crystallization process for diammonium phosphate without refrigeration and vapourization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88103797.4A CN1006057B (en) | 1988-06-25 | 1988-06-25 | New crystallization process for diammonium phosphate without refrigeration and vapourization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN88103797A CN88103797A (en) | 1988-12-28 |
| CN1006057B true CN1006057B (en) | 1989-12-13 |
Family
ID=4832750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88103797.4A Expired CN1006057B (en) | 1988-06-25 | 1988-06-25 | New crystallization process for diammonium phosphate without refrigeration and vapourization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006057B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106345135B (en) * | 2015-07-15 | 2018-07-20 | 中国石油化工股份有限公司 | A kind of crystallizing tower for gas phase reaction |
-
1988
- 1988-06-25 CN CN88103797.4A patent/CN1006057B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN88103797A (en) | 1988-12-28 |
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Legal Events
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |