CN1231265A - Process for preparing potassium dihydrogen phosphate and boric acid - Google Patents
Process for preparing potassium dihydrogen phosphate and boric acid Download PDFInfo
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- CN1231265A CN1231265A CN 99114753 CN99114753A CN1231265A CN 1231265 A CN1231265 A CN 1231265A CN 99114753 CN99114753 CN 99114753 CN 99114753 A CN99114753 A CN 99114753A CN 1231265 A CN1231265 A CN 1231265A
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- dihydrogen phosphate
- potassium dihydrogen
- boric acid
- filtering
- filtrate
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Abstract
The preparation process of potassium dihydrogen phosphate and boric acid includes the following steps: adding 1 portion of borax and 0.6-0.8 portions of phosphoric acid whose concentration is greater than 85% in reactor, reaction for 1-2 hr at 90-120 deg.C to obtain thick slurry, cooling, filtering to obtain filter cake, drying to obtain boric acid, feeding the filtrate into double decomposition reactor, adding 0.2-0.4 portions of potassium chloride, reaction for 1.5-2 hr. at 90-120 deg.C to obtain slurry, cooling, filtering to obtain filter cake, i. e. crude potassium dihydrogen phosphate, recrystallization, filtering and drying to obtain the potassium dihydrogen phosphate.
Description
The invention relates to potassium dihydrogen phosphate (KH)2PO4) And boric acid (H)3BO3) Belonging to the field of inorganic chemical industry.
The production of boric acid generally adopts sulfuric acid or hydrochloric acid to decompose borax (Na)2B4O7·10H2O) to obtain. However, the mother liquor contains boric acid and a large amount of mirabilite or NaCl, the recovery equipment is complicated, and the recovered byproduct mirabilite or NaCl has low product value, so the mother liquor is generally discharged as waste water, the environment is polluted, and the utilization rate of boron is reduced.
The invention aims to provide a preparation process which does not generate waste residues and waste gases, has high utilization rate of boron and coproduces monopotassium phosphate and boric acid.
The purpose of the invention is realized by the following technical scheme:
adding 1 part of borax and 0.6-0.8 part of phosphoric acid with the concentration of more than 85% into a reaction kettle, reacting for 1-2 hours at 90-120 ℃ to obtain thick slurry, cooling, filtering, and drying the obtained filter cake to obtain a product boric acid; sending the filtrate to a double decomposition reactor, adding 0.2-0.4 part of potassium chloride, reacting at 90-120 ℃ for 1.5-2 hours, cooling the obtained slurry, and filtering to obtain a filter cake which is crude potassium dihydrogen phosphate; and recrystallizing, filtering and drying the crude potassium dihydrogen phosphate to obtain the potassium dihydrogen phosphate product.
The filtrate after separating out the crude monopotassium phosphate in the technical scheme is concentrated, and is filtered when the filtrate is hot after the concentration, and the filter cake is a byproduct of industrial salt; cooling the filtrate and recovering the potassium dihydrogen phosphate.
The reaction principle of the invention is as follows:
compared with the prior art, the method uses medium-strong acid phosphoric acid to decompose borax instead of strong acid, can produce boric acid with high quality, can co-produce high-value monopotassium phosphate, does not produce waste residues and waste gas, does not pollute the environment, greatly improves the utilization rate of boron, saves resources, reduces the production cost, and has good economic benefit and social benefit.
The following is an example of the invention, the borax used being a secondary product containing NaB4O7·10H2More than or equal to 95 percent of O, more than or equal to 85 percent of phosphoric acid and more than or equal to 94 percent of potassium chloride.
Example one
Adding 1 part of borax and 0.6 part of phosphoric acid into a reaction kettle, carrying out acidolysis reaction for 2 hours at 90 ℃ to obtain thick slurry, cooling, filtering to obtain wet boric acid crystals, and drying to obtain 0.6 part of boric acid. And (3) sending the filtrate to a double decomposition reactor, adding 0.2 part of potassium chloride, reacting at 95 ℃ for 2 hours, cooling the obtained slurry, and filtering to obtain a filter cake which is crude potassium dihydrogen phosphate. The crude potassium dihydrogen phosphate is recrystallized, cooled, filtered and dried to obtain 0.33 part of finished potassium dihydrogen phosphate. And (3) concentrating the filtrate after separating out the crude potassium dihydrogen phosphate, filtering while the filtrate is hot after the concentration is finished, wherein a filter cake is a byproduct of industrial salt, and cooling the filtrate to recover the potassium dihydrogen phosphate.
Example two
In the acidolysis reaction, the using amount of phosphoric acid is 0.8 part, the reaction temperature is 120 ℃, and the reaction time is 1 hour; in the metathesis reaction, the amount of potassium chloride is 0.4 part, the reaction temperature is 120 ℃ and the reaction time is 1.5 hours, so that 0.63 part of boric acid and 0.55 part of monopotassium phosphate are obtained, and the rest is the same as in the first example.
Claims (2)
1. A preparation process of monopotassium phosphate and boric acid is characterized in that 1 part of borax and 0.6-0.8 part of phosphoric acid with the concentration of more than 85% are added into a reaction kettle, the mixture reacts for 1-2 hours at the temperature of 90-120 ℃ to obtain thick slurry, and the thick slurry is cooled and filtered to obtain a filter cake which is dried to obtain the boric acid product; sending the filtrate to a double decomposition reactor, adding 0.2-0.4 part of potassium chloride, reacting at 90-120 ℃ for 1.5-2 hours, cooling the obtained slurry, and filtering to obtain a filter cake which is crude potassium dihydrogen phosphate; and recrystallizing, filtering and drying the crude potassium dihydrogen phosphate to obtain the potassium dihydrogen phosphate product.
2. The process according to claim 1, wherein the filtrate from which the crude potassium dihydrogen phosphate is separated is concentrated and then filtered while hot, and the filter cake is a byproduct of industrial salt; cooling the filtrate and recovering the potassium dihydrogen phosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99114753 CN1231265A (en) | 1999-03-30 | 1999-03-30 | Process for preparing potassium dihydrogen phosphate and boric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99114753 CN1231265A (en) | 1999-03-30 | 1999-03-30 | Process for preparing potassium dihydrogen phosphate and boric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1231265A true CN1231265A (en) | 1999-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99114753 Pending CN1231265A (en) | 1999-03-30 | 1999-03-30 | Process for preparing potassium dihydrogen phosphate and boric acid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1231265A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992289A (en) * | 2012-12-27 | 2013-03-27 | 广西明利化工有限公司 | Method for producing food-grade phosphoric acid |
| CN103072963A (en) * | 2012-12-28 | 2013-05-01 | 山东金正大生态工程股份有限公司 | Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid |
-
1999
- 1999-03-30 CN CN 99114753 patent/CN1231265A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992289A (en) * | 2012-12-27 | 2013-03-27 | 广西明利化工有限公司 | Method for producing food-grade phosphoric acid |
| CN102992289B (en) * | 2012-12-27 | 2014-09-17 | 广西明利化工有限公司 | Method for producing food-grade phosphoric acid |
| CN103072963A (en) * | 2012-12-28 | 2013-05-01 | 山东金正大生态工程股份有限公司 | Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid |
| CN103072963B (en) * | 2012-12-28 | 2014-11-05 | 金正大生态工程集团股份有限公司 | Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |