CN101734634A - Method for producing monopotassium phosphate - Google Patents
Method for producing monopotassium phosphate Download PDFInfo
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- CN101734634A CN101734634A CN200810194402A CN200810194402A CN101734634A CN 101734634 A CN101734634 A CN 101734634A CN 200810194402 A CN200810194402 A CN 200810194402A CN 200810194402 A CN200810194402 A CN 200810194402A CN 101734634 A CN101734634 A CN 101734634A
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- China
- Prior art keywords
- phosphoric acid
- purifying
- wet
- phosphate
- potassium
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Abstract
The invention discloses a method for producing monopotassium phosphate. Wet phosphoric acid is purified, liquid ammonia is introduced into the purified phosphoric acid to prepare monoammonium phosphate solution, and potassium chloride aqueous solution is added into the solution to generate monopotassium phosphate. Excess potassium chloride and ammonia are transferred into a by-product N-P-K compound fertilizer to obtain a product with high purity and high yield.
Description
Technical field: the invention belongs to technical field of fertilizers, be specifically related to the method that a kind is produced potassium primary phosphate.
Background technology: potassium primary phosphate (KH
2PO
4) belong to the high concentration phosphorus K compound fertilizer, be a kind of good chlorideless potassic fertilizer, be applicable to various crops, also can be used in the industry such as catalysis, environmental protection.Its production method has neutralisation, direct method, ion exchange method, electroosmose process, solvent extration, conventional double decomposition etc.Neutralisation is a raw material with thermal phosphoric acid and potassium hydroxide (or salt of wormwood), has characteristics such as technological process is simple, facility investment is few, constant product quality, but the raw materials cost height; Conventional double decomposition is that raw material reacts with thermal phosphoric acid and Repone K, produces potassium primary phosphate by removing de-chlorine hydride, the temperature of reaction height, and byproduct hydrogen chloride corrodibility is big, and non-standard equipment is many, and unstable product quality easily produces potassium metaphosphate.Solvent extration technical process complexity, the organic solvent costliness is invested higher.The author
Summary of the invention: it is raw material that the present invention selects liquefied ammonia, phosphoric acid by wet process, industrial potassium chloride for use, and the potassium primary phosphate by double decomposition production meets HG2321-1992 agricultural grade standard, and potassium primary phosphate yield 〉=83%, the mother liquor reusable edible.
The present invention is achieved in that
The purification of phosphoric acid by wet process
Phosphoric acid by wet process contains Fe, Al, Mg, Ca, Si, S, the F plurality of impurities, though and the low As bigger of content to the phosphate product quality influence, Pb etc. also contain medicament used in the phosphate rock floating process sometimes, and sulfuric acid, phosphoric acid corrosion extraction equipment and nonferrous metal ion of producing etc.With raw material with alcohol mixture (C
2H
5OH+C
4H
9OH) be solvent,, purify sour yield and can reach 84% by the technology of sedimentation method for purifying wet method phosphoric acid; P
2O
5Overall utilization is 98.9%, and precipitation slag can be used as fertilizer, and the purity that purifies acid reaches the level of thermal phosphoric acid, through technical economical analysis, purifies sour cost method of specific heat phosphoric acid low 20%.In purifying good phosphoric acid, feed liquefied ammonia and make ammonium dihydrogen phosphate, in solution, add potassium chloride solution then, concentration by increasing reactant Repone K and reduce the amount that is present in potassium dihydrogen phosphate crystal in the mother liquor, molecular balance is moved to the positive reaction direction, be tending towards finishing, the principal reaction equation is as follows:
KCl
(excessive)+ H
3PO
4+ OH
-=KH
2PO
4+ Cl
-+ H
2O
Owing to common-ion effcet, the rapid decline solubleness of simultaneous temperature also decreases potassium primary phosphate in water; Potassium primary phosphate crystalline amount also increases thereupon.Excessive Repone K and ammonia are transferred in the byproduct nitrogen-phosphorus-potassium compound fertilizer.
Embodiment: the present invention is described in detail below in conjunction with embodiment.
Embodiment 1
With the raw material phosphoric acid by wet process with alcohol mixture (C
2H
5OH+C
4H
9OH) be solvent,, purify sour yield and can reach 84% by the technology of sedimentation method for purifying wet method phosphoric acid; P
2O
5Overall utilization is 98.9%, in purifying good phosphoric acid, feed liquefied ammonia and make ammonium dihydrogen phosphate, reaction times 50min, the replacement(metathesis)reaction temperature is selected in 80 ℃, add potassium chloride solution then in solution, Repone K is 2: 1 with the amount of substance ratio of phosphoric acid, and product is through check, the potassium primary phosphate massfraction is 98.1%, and quality meets HG2321-1992 agricultural grade standard: w (potassium primary phosphate) 〉=96.0%.
Claims (3)
1. method of producing potassium primary phosphate, it is characterized in that comprising following consecutive steps: earlier with wet phosphoric acid purifying, in purifying good phosphoric acid, feed liquefied ammonia then and make ammonium dihydrogen phosphate, in solution, add potassium chloride solution then, generate potassium primary phosphate.
2. the method for claim 1 is characterized in that it is solvent that wet phosphoric acid purifying adopts with alcohol mixture (C2H5OH+C4H9OH), by the technology of sedimentation method for purifying wet method phosphoric acid, purifies sour yield and can reach 84%; The P2O5 overall utilization is 98.9%, and precipitation slag can be used as fertilizer, and the purity that purifies acid reaches the level of thermal phosphoric acid.
3. the method for claim 1 is characterized in that the excessive Repone K and the ammonia that generate transfers in the byproduct nitrogen-phosphorus-potassium compound fertilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810194402A CN101734634A (en) | 2008-11-04 | 2008-11-04 | Method for producing monopotassium phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810194402A CN101734634A (en) | 2008-11-04 | 2008-11-04 | Method for producing monopotassium phosphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101734634A true CN101734634A (en) | 2010-06-16 |
Family
ID=42458755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810194402A Pending CN101734634A (en) | 2008-11-04 | 2008-11-04 | Method for producing monopotassium phosphate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101734634A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101661A (en) * | 2010-12-29 | 2011-06-22 | 武汉同源药业有限公司 | Method for preparing high-purity monopotassium phosphate crude medicine |
| CN103159195A (en) * | 2013-04-12 | 2013-06-19 | 成都川科化工有限公司 | Method for preparing potassium dihydrogen phosphate from low-concentration wet-process phosphoric acid |
| CN103588188A (en) * | 2013-11-08 | 2014-02-19 | 清华大学 | Method for removing foreign ions from organic solvent loaded with phosphoric acid by ammonia gas |
| CN104891465A (en) * | 2015-05-29 | 2015-09-09 | 湖北三宁化工股份有限公司 | Method for preparing potassium dihydrogen phosphate from industrial monoammonium phosphate mother solution |
| CN113024284A (en) * | 2020-12-03 | 2021-06-25 | 天津大学 | Method for preparing nitrogen-phosphorus-potassium compound fertilizer by fertilizer-grade phosphoric acid eutectic |
-
2008
- 2008-11-04 CN CN200810194402A patent/CN101734634A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101661A (en) * | 2010-12-29 | 2011-06-22 | 武汉同源药业有限公司 | Method for preparing high-purity monopotassium phosphate crude medicine |
| CN102101661B (en) * | 2010-12-29 | 2012-05-30 | 武汉同源药业有限公司 | Method for preparing high-purity monopotassium phosphate crude medicine |
| CN103159195A (en) * | 2013-04-12 | 2013-06-19 | 成都川科化工有限公司 | Method for preparing potassium dihydrogen phosphate from low-concentration wet-process phosphoric acid |
| CN103588188A (en) * | 2013-11-08 | 2014-02-19 | 清华大学 | Method for removing foreign ions from organic solvent loaded with phosphoric acid by ammonia gas |
| CN103588188B (en) * | 2013-11-08 | 2016-03-23 | 清华大学 | The method of a kind of ammonia imurity-removal ion from the organic solvent of load phosphoric acid |
| CN104891465A (en) * | 2015-05-29 | 2015-09-09 | 湖北三宁化工股份有限公司 | Method for preparing potassium dihydrogen phosphate from industrial monoammonium phosphate mother solution |
| CN113024284A (en) * | 2020-12-03 | 2021-06-25 | 天津大学 | Method for preparing nitrogen-phosphorus-potassium compound fertilizer by fertilizer-grade phosphoric acid eutectic |
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| DD01 | Delivery of document by public notice |
Addressee: Li Haitao Document name: the First Notification of an Office Action |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100616 |