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Potassium dihydrogen phosphite and its preparing process

Abstract

A potassium dihydrogen phosphite (KH2PO3) is prepared from phosphorous acid and potassium carbonate through reaction in the presence of stabilizer. It can be used as fungicide, insecticide, or fertilizer in agriculture and for treating water. Its advantages are simple preparing process, no environmental pollution, and easily available raw materials.

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CN1346789A

China

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Chinese
Inventor
赵金华
Current Assignee
Rudong Zhenfeng Yiyang Chemical Co Ltd
Worldwide applications
2001 CN
Application CN 01134148 events
2001-11-04
Application filed by Individual
2001-11-04
Priority to CNB011341483A
2002-05-01
Publication of CN1346789A
2004-03-17
Application granted
2004-03-17
Publication of CN1142090C
2021-11-04
Anticipated expiration
Status
Expired - Lifetime
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Cited by (4)
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Description

Potassium dihydrogen phosphite and its preparing process
The invention relates to a
No report of potassium dihydrogen phosphite exists in the prior art. The existing fertilizers and bactericides are various, but have certain defects in different degrees.
The invention aims to provide a novel compound potassium dihydrogen phosphite and a production method thereof.
The purpose of the invention is realized as follows:
potassium dihydrogen phosphite, characterized by: the chemical structural formula is as follows:
Figure A0113414800031
the physical properties of the above compounds are: is deliquescent, soluble in water and weakly acidic.
A method for producing potassium dihydrogen phosphite is characterized in that: reacting phosphorous acid and potassium carbonate in the presence of a stabilizer to obtain potassium dihydrogen phosphite (KH)2PO3) The reaction formula is as follows:
the reaction temperature is 70-100 ℃. The reaction time is 8-15 hours. The stabilizer is an inert gas or liquid. The inert gas is nitrogen or helium. Inert gasThe liquid is liquid nitrogen. CO produced in the reaction2Introducing into lime water. And (3) concentrating the potassium dihydrogen phosphite solution obtained by the reaction, then carrying out dynamic crystallization in a natural cooling state, then carrying out centrifugal treatment, and taking the precipitate to obtain the potassium dihydrogen phosphite solid. The concentration treatment is carried out at 85-130 ℃.
The product provided by the invention can be used as an important intermediate and a fertilizer of an insecticide and a bactericide on pesticides, can provide phosphorus and potassium necessary for plant growth, can kill fungi of plants, and is non-toxic and residue-free; the water treatment agent can be directly used in an industrial self-circulation water system, has the functions of sterilization and calcium and magnesium ion complexation, can replace an organic phosphine water treatment agent, reduces environmental pollution, and is a high-efficiency green and environment-friendly product. The production method is simple and easy to operate, and raw materials are easy to obtain.
The present invention will be further described with reference to the following examples.
Example 1:
taking potassium carbonate and phosphorous acid solid according to a molar ratio of 1: 1.5-2.5 (examples 1: 1.5, 1: 2, 1: 2.5), respectively dissolving with water, filtering, combining filtrates, reacting, introducing nitrogen as a stabilizer, reacting at 70-100 ℃ (70, 80, 90, 100 ℃) for 8-15 hours (8, 10, 12, 14, 15 hours), and reacting CO generated in the reaction2And (2) introducing lime water for discharging, concentrating the reaction-obtained potassium dihydrogen phosphite solution at 85-130 ℃ (for example 85, 95, 100, 110, 120 and 130 ℃), performing conventional dynamic crystallization, performing centrifugal treatment, and taking precipitate to obtain potassium dihydrogen phosphite solid, wherein the chemical structural formula of the solid is as follows:
Figure A0113414800041
example 2:
helium was used as the stabilizer, and the rest was the same as in example 1.
Example 3: the stabilizer used was liquid nitrogen in an amount of 0.1 to 0.5% by weight based on the weight of the phosphorous acid solid, as in example 1.

Claims (10)
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1. Potassium dihydrogen phosphite, characterized by: the chemical structural formula is as follows:
Figure A0113414800021
2. a production method of potassium dihydrogen phosphite is characterized in that: reacting phosphorous acid and potassium carbonate in the presence of a stabilizer to obtain potassium dihydrogen phosphite, wherein the reaction formula is as follows:
3. the method for producing potassium dihydrogen phosphite as set forth in claim 2, wherein: the reaction temperature is 70-100 ℃.
4. The method for producing potassium dihydrophosphite of claim 2 or 3, wherein: the reaction time is 8-15 hours.
5. The method for producing potassium dihydrophosphite of claim 2, 3 or 4, wherein: the stabilizer is an inert gas or liquid.
6. The method for producing potassium dihydrogen phosphite as set forth in claim 5, wherein: the inert gas is nitrogen or helium.
7. The method for producing potassium dihydrogen phosphite as set forth in claim 5, wherein: the inert liquid is liquid nitrogen.
8. The method for producing potassium dihydrophosphite of claim 2, 3 or 4, wherein: CO produced in the reaction2Introducing into lime water.
9. The method for producing potassium dihydrophosphite of claim 2, 3 or 4, wherein: and (3) concentrating the potassium dihydrogen phosphite solution obtained by the reaction, then carrying out dynamic crystallization, then carrying out centrifugal treatment, and taking the precipitate to obtain the potassium dihydrogen phosphite solid.
10. The method for producing potassium dihydrogen phosphite as set forth in claim 7, wherein: the concentration treatment is carried out at 85-130 ℃.

Cited By (4)

Publication number Priority date Publication date Assignee Title
CN103553723A * 2013-11-08 2014-02-05 翁莹冰 Solid-phase synthesis method of phosphate-phosphite compound fertilizers
CN106672929A * 2017-01-17 2017-05-17 成都乐氏化工工程有限公司 Method for preparing potassium dihydrogen phosphite
CN109673668A * 2019-02-22 2019-04-26 铜仁学院 A kind of drought-resistant medicament for promoting rape seed to sprout emergence
CN117069079A * 2023-08-05 2023-11-17 如东振丰奕洋化工有限公司 Preparation process and application of potassium dihydrogen phosphite
Family To Family Citations
* Cited by examiner, † Cited by third party, ‡ Family to family citation

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Priority And Related Applications

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Application Filing date Title
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Legal Events

Date Code Title Description
2002-05-01 C06 Publication
2002-05-01 PB01 Publication
2002-06-19 C10 Entry into substantive examination
2002-06-19 SE01 Entry into force of request for substantive examination
2004-03-17 C14 Grant of patent or utility model
2004-03-17 GR01 Patent grant
2009-01-21 EE01 Entry into force of recordation of patent licensing contract

Assignee: Rudong Zhenfeng Yiyang Chemical Co. Ltd.

Assignor: Zhao Jinhua

Contract fulfillment period: 2008.8.15 to 2013.8.15

Contract record no.: 2008320000875

Denomination of invention: Potassium dihydrogen phosphite and its preparing process

Granted publication date: 20040317

License type: Exclusive license

Record date: 20081013
2009-03-31 LIC Patent licence contract for exploitation submitted for record

Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.8.15 TO 2013.8.15; CHANGE OF CONTRACT

Name of requester: RUDONG ZHENFENGYIYANG CHEMICAL ENGINEERING CO., LT

Effective date: 20081013
2017-06-16 TR01 Transfer of patent right

Effective date of registration: 20170531

Address after: 226400 the Yellow Sea chemical industry zone, Nantong Economic Development Zone, Rudong County, Jiangsu

Patentee after: Rudong Zhenfeng Yiyang Chemical Co. Ltd.

Address before: 226408, Feng County, Jiangsu County, Rudong Province

Patentee before: Zhao Jinhua
2021-11-23 CX01 Expiry of patent term
2021-11-23 CX01 Expiry of patent term

Granted publication date: 20040317