CN102001639A - Method for continuously producing potassium pyrophosphate by two-step process - Google Patents
Method for continuously producing potassium pyrophosphate by two-step process Download PDFInfo
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- CN102001639A CN102001639A CN201010524603.3A CN201010524603A CN102001639A CN 102001639 A CN102001639 A CN 102001639A CN 201010524603 A CN201010524603 A CN 201010524603A CN 102001639 A CN102001639 A CN 102001639A
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Abstract
The invention discloses a method for continuously producing potassium pyrophosphate by a two-step process, which comprises the following steps of: reacting phosphoric acid and potassium hydroxide in a neutralization kettle to obtain solution of dipotassium phosphate; spraying or depositing the solution of dipotassium phosphate on a rotary drum surface of a rotary drum scraper dryer which rotates continuously to form a material film with the thickness of 0.5 to 1.5mm, transferring heat to the material film on the rotary drum surface by using high-temperature heat-conducting oil as a heat transfer medium and heating the material film, scraping the rest material with a scraper after 92 to 97 percent of moisture is evaporated, and obtaining relatively humid granular or plate-like solid dipotassium phosphate with the moisture content of 3 to 8 percent; and continuously conveying the solid dipotassium phosphate into a rotary horizontal polymerization furnace to perform continuous dewatering and polymerization with reverse combustion gas or hot air generated by an air heater at the high temperature of 500 to 600 DEG C so as to generate potassium pyrophosphate, cooling, smashing, packaging and obtaining the potassium pyrophosphate products. The method can reduce the energy consumption of potassium pyrophosphate production; the production process is continuous and closed; environmental pollution is prevented; and the prepared potassium pyrophosphate has high content and high quality.
Description
Technical field
The present invention relates to chemical technology field, be specifically related to a kind of method that adopts two-step approach continuous production potassium pyrophosphate.
Background technology
Potassium pyrophosphate is generally white powdery and clear crystal shape, very easily moisture absorption and deliquescence, anhydride molecular formula: K
4P
2O
7Be the fine chemical material product that is used for industries such as cyanideless electro-plating industry, food-processing industry, washing dyeing industry, ceramic industry, potassium pyrophosphate involved in the present invention is anhydride.The method of the potassium pyrophosphate of China's production at present mainly contains two kinds, one is " calcination method ", promptly at first dipotassium hydrogen phosphate solution is concentrated and produce the dipotassium hydrogen phosphate crystal, send in the calcining furnace further heat again and slough crystal water and molecular water, obtain the potassium pyrophosphate product 500-600 ℃ of following polymerization.This production method advantage is little for investment, and equipment is simple.Its shortcoming is that the mode of production is an intermittent type, industrial scale is little, production efficiency is low, because of material in the heated polymerizable process of dipotassium hydrogen phosphate is in static state, there is the bigger temperature difference in the material table, thereby unstable product quality, according to the potassium pyrophosphate physics-chem characteristic of the moisture absorption very easily, also be difficult to accomplish clean environment firendly production.It two is " a horizontal polymerization furnace single stage method ", is about to dipotassium hydrogen phosphate solution and pressurizes with high-pressure pump, and by the atomizing of burner spray gun, with the combustion gas mixing of carrying out in the same way, the dehydration polymerisation step is finished, and obtains the potassium pyrophosphate product in horizontal polymerization furnace.This working system can be accomplished continuous production, and technical process is simple, but has two subject matters: the one, and type of heating adopts following current, and the polymerization temperature of product is 500-600 ℃, and the exhaust temperature of its tail gas reaches more than 500 ℃, causes heat energy to be wasted in a large number; The 2nd, the granular dipotassium hydrogen phosphate fine powder that produces in the atomization drying process, bulk density is less, for about 0.3-0.5g/cm3, because of stopping the short potassium pyrophosphate that do not generate of polymerization time, a part causes unstable product quality to considerable dipotassium hydrogen phosphate particle suspension among the sedimentation of stove tail is brought into product in air-flow, another part is brought into the washing tail gas system, a large amount of high-temperature vapors are mingled with dust discharges, and Dark smoke billows, has increased the pressure that environmental protection is produced.
Summary of the invention
Technical problem to be solved by this invention is: how a kind of method of two-step approach continuous production potassium pyrophosphate is provided, and this method can reduce the energy consumption that potassium pyrophosphate is produced significantly, and production process is sealed continuously, avoids environmental pollution; Higher, the stay in grade of potassium pyrophosphate content that adopts this method to produce.
Technical problem proposed by the invention is to solve like this: a kind of method of two-step approach continuous production potassium pyrophosphate is provided, it is characterized in that, comprise the steps:
Producing of A, dipotassium hydrogen phosphate: with phosphoric acid and potassium hydroxide in and in the still reaction obtain dipotassium hydrogen phosphate solution;
Being heating and curing of B, dipotassium hydrogen phosphate: it is the material film of 0.5-1.5mm that dipotassium hydrogen phosphate solution spray or the cylinder surface that soaks the Rollingscratchboarddrier that invests continuous rotation are formed thickness, be used to from the high temperature heat conductive oil of heat conducting oil boiler as heat-transfer medium the heating of constantly conducting heat of the material film of cylinder surface, to the moisture that evaporates 92-97%, scrape leftover materials, obtain water content at the moistening relatively granular or flaky solid-state dipotassium hydrogen phosphate of 3-8% by scraper;
Producing of C, potassium pyrophosphate: this solid-state dipotassium hydrogen phosphate is sent in the horizontal polymerization furnace of rotation continuously, carry out countercurrent flow with the burning gas or the warm air that produce by hotblast stove, continue dehydration, polymerization under 500-600 ℃ of temperature, generate potassium pyrophosphate, obtain the potassium pyrophosphate finished product through the cooling crushing packing.
Method according to two-step approach continuous production potassium pyrophosphate provided by the present invention is characterized in that: in steps A, the proportion of control neutralizer is 1.5-1.8g/cm3, and pH value is 8.6-9.0.
Method according to two-step approach continuous production potassium pyrophosphate provided by the present invention is characterized in that: in step B, the temperature of thermal oil is 200 ℃-340 ℃.
Method according to two-step approach continuous production potassium pyrophosphate provided by the present invention is characterized in that: in step C, solid-state dipotassium hydrogen phosphate adopts spiral conveyer, belt conveyor or bucket elevator to send into continuously in the horizontal polymerization furnace of rotation.
Method according to two-step approach continuous production potassium pyrophosphate provided by the present invention is characterized in that: in step C, the dipotassium hydrogen phosphate pressed powder that the tail gas of horizontal polymerization furnace is taken away can obtain anhydrous di-potassium hydrogen phosphate after being collected by tornado dust collector; Thoroughly wash remaining dipotassium hydrogen phosphate pressed powder by water wash column recirculated water more afterwards, in delivering to by blowback with recirculated water and in the still.
In sum, the method for two-step approach continuous production potassium pyrophosphate provided by the present invention has following advantage than prior art:
1, energy-saving and cost-reducing: the key equipment Rollingscratchboarddrier that the present invention adopts, its heat transfer theory are the consistent unidirectional heat transfers of direction from inside to outside, make heat-transfer medium with high temperature heat conductive oil, the dry tenacity height, and thermo-efficiency can reach 80-90%.Granular or the sheet dipotassium hydrogen phosphate intermediates that make, water content is at 3-8%, relative weight in wet base, can do not kicked up by hot blast, make countercurrent flow technology be able to successful implementation, the hot gas below 500 ℃ is used for preheating, the free-water of dephosphorylate hydrogen dipotassium and part molecular water, the exhaust emissions temperature is below 300 ℃, and heat energy is fully used, and thermo-efficiency is greatly improved.Compare with conventional fabrication processes, can save energy 40-60%.
2, product content height, stay in grade: because the dehydration polymerization process of product is to carry out in the polymerization furnace that constantly rotates in the middle of the dipotassium hydrogen phosphate, material enters from burner, and the stove wake flow goes out, and hot gas is then opposite.Material is constantly overturn therein, has guaranteed that same cross section material temperature is in full accord, thereby has guaranteed the stable of product quality.In like manner, same cross section material temperature can be controlled at needed technological temperature than being easier to, thereby makes high-load product, and the content of product can reach more than 98%.After sending into cooling drum cooling from the effusive product of horizontal polymerization furnace afterbody, carry out crushing packing again.Whole technological process all is among the continuous closed state, makes quality product obtain strict guarantee.
3, production process clean environment firendly, pollution-free: the first step drying of this technology is a material film evaporation drying, and drying process has only moisture to be evaporated eliminating, and no material dust produces.It is relatively wet and big and heavy to participate in the polymeric material in horizontal polymerization furnace, is difficult for producing airborne dust, and the powder of taking out of is on a small quantity collected by tornado dust collector, and the dust of trace is thoroughly washed by water wash column, thereby accomplishes clean environment firendly production.
4, succinct, the highly versatile of technical process: the temperature to this technology polymeric part adjusts slightly, reduce to 200-300 ℃, can make the good dipotassium hydrogen phosphate finished product of quality, overcome with spray-drying process and produced the low shortcoming of energy consumption height, yield that dipotassium hydrogen phosphate exists.Potassium phosphorus ratio to the neutralization part is adjusted, and can also make products such as potassium primary phosphate, Tripotassium phosphate, Potassium tripolyphosphate.Other are similar to the potassium pyrophosphate polymerization manufacturing of need dewatering the phosphate product of corresponding characteristics, adopts this explained hereafter, all can benefit from the present invention's advantage.
Description of drawings
Fig. 1 is the process flow sheet of two-step approach continuous production potassium pyrophosphate provided by the present invention;
Fig. 2 is for adopting the process flow sheet of method production anhydrous di-potassium hydrogen phosphate of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the present invention are described in detail.
As shown in Figure 1, the method for two-step approach continuous production potassium pyrophosphate provided by the present invention comprises the steps: producing of A, dipotassium hydrogen phosphate: with phosphoric acid and potassium hydroxide in and in the still reaction obtain dipotassium hydrogen phosphate solution; B, being heating and curing of dipotassium hydrogen phosphate: it is the material film of 0.5-1.5mm that dipotassium hydrogen phosphate solution spray or the cylinder surface that soaks the Rollingscratchboarddrier that invests continuous rotation are formed thickness, be used to from the high temperature heat conductive oil of heat conducting oil boiler as heat-transfer medium the heating of constantly conducting heat of the material film of cylinder surface, to the moisture that evaporates 92-97%, scrape leftover materials by scraper, obtain water content at the moistening relatively granular or flaky solid-state dipotassium hydrogen phosphate of 3-8%, be convenient to carry out countercurrent flow, be unlikely to produce a large amount of airborne dusts at next step polymerization process and hot blast; Producing of C, potassium pyrophosphate: this solid-state dipotassium hydrogen phosphate is sent in the horizontal polymerization furnace of rotation continuously, carry out countercurrent flow with the burning gas or the warm air that produce by hotblast stove, continue dehydration, polymerization under 500-600 ℃ of high temperature, exhaust temperature 250-300 ℃, generate potassium pyrophosphate, obtain the potassium pyrophosphate finished product through the cooling crushing packing.
In steps A, the proportion of control neutralizer is 1.5-1.8g/cm3, and pH value is 8.6-9.0.In step B, the temperature of thermal oil is 200 ℃-340 ℃.In step C, solid-state dipotassium hydrogen phosphate adopts spiral conveyer, belt conveyor or bucket elevator to send into continuously in the horizontal polymerization furnace of rotation; The dipotassium hydrogen phosphate pressed powder that the tail gas of horizontal polymerization furnace is taken away can obtain anhydrous di-potassium hydrogen phosphate after being collected by tornado dust collector; Thoroughly wash remaining dipotassium hydrogen phosphate pressed powder by water wash column recirculated water more afterwards, utilize again in delivering to by blowback with recirculated water and in the still.
Embodiment 1:
Producing of A, dipotassium hydrogen phosphate: with phosphoric acid and potassium hydroxide in and in the still reaction obtain dipotassium hydrogen phosphate solution, the proportion of control neutralizer is 1.5g/cm3, pH value is 9.0; B, being heating and curing of dipotassium hydrogen phosphate: it is the material film of 0.5mm that dipotassium hydrogen phosphate solution spray or the cylinder surface that soaks the Rollingscratchboarddrier that invests continuous rotation are formed thickness, be used to temperature from heat conducting oil boiler and be 200 ℃ thermal oil as heat-transfer medium to the heating of constantly conducting heat of the material film of cylinder surface, after evaporating 97% moisture, scrape leftover materials by scraper, obtain water content at 3% moistening relatively granular or flaky solid-state dipotassium hydrogen phosphate, be convenient to carry out countercurrent flow, be unlikely to produce a large amount of airborne dusts at next step polymerization process and hot blast; Producing of C, potassium pyrophosphate: adopt spiral conveyer to send into continuously in the horizontal polymerization furnace of rotation this solid-state dipotassium hydrogen phosphate, carry out countercurrent flow with the burning gas or the warm air that produce by hotblast stove, continue dehydration, polymerization under 500 ℃ of temperature, 260 ℃ of exhaust temperatures, generate potassium pyrophosphate, obtain the potassium pyrophosphate finished product through the cooling crushing packing; After simultaneously about 5% the dipotassium hydrogen phosphate pressed powder taken away of the tail gas of horizontal polymerization furnace is collected by tornado dust collector, can obtain anhydrous di-potassium hydrogen phosphate; Thoroughly wash remaining dipotassium hydrogen phosphate pressed powder by water wash column recirculated water more afterwards, utilize again in delivering to by blowback with recirculated water and in the still.
Embodiment 2:
Producing of A, dipotassium hydrogen phosphate: with phosphoric acid and potassium hydroxide in and in the still reaction obtain dipotassium hydrogen phosphate solution, the proportion of control neutralizer is 1.8g/cm3, pH value is 8.6; B, being heating and curing of dipotassium hydrogen phosphate: it is the material film of 1.5mm that dipotassium hydrogen phosphate solution spray or the cylinder surface that soaks the Rollingscratchboarddrier that invests continuous rotation are formed thickness, be used to temperature from heat conducting oil boiler and be 340 ℃ thermal oil as heat-transfer medium to the heating of constantly conducting heat of the material film of cylinder surface, after evaporating 92% moisture, scrape leftover materials by scraper, obtain water content at 8% moistening relatively granular or flaky solid-state dipotassium hydrogen phosphate, be convenient to carry out countercurrent flow, be unlikely to produce a large amount of airborne dusts at next step polymerization process and hot blast; Producing of C, potassium pyrophosphate: adopt belt conveyor to send into continuously in the horizontal polymerization furnace of rotation this solid-state dipotassium hydrogen phosphate, carry out countercurrent flow with the burning gas or the warm air that produce by hotblast stove, continue dehydration, polymerization under 590 ℃ of temperature, 290 ℃ of exhaust temperatures, generate potassium pyrophosphate, obtain the potassium pyrophosphate finished product through the cooling crushing packing; After the dipotassium hydrogen phosphate pressed powder that the tail gas of horizontal polymerization furnace of while is taken away is collected by tornado dust collector, can obtain anhydrous di-potassium hydrogen phosphate; Thoroughly wash remaining dipotassium hydrogen phosphate pressed powder by water wash column recirculated water more afterwards, utilize again in delivering to by blowback with recirculated water and in the still.
Embodiment 3:
Producing of A, dipotassium hydrogen phosphate: with phosphoric acid and potassium hydroxide in and in the still reaction obtain dipotassium hydrogen phosphate solution, the proportion of control neutralizer is 1.6g/cm3, pH value is 8.8; B, being heating and curing of dipotassium hydrogen phosphate: it is the material film of 1.0mm that dipotassium hydrogen phosphate solution spray or the cylinder surface that soaks the Rollingscratchboarddrier that invests continuous rotation are formed thickness, be used to temperature from heat conducting oil boiler and be 270 ℃ thermal oil as heat-transfer medium to the heating of constantly conducting heat of the material film of cylinder surface, after evaporating 95% moisture, scrape leftover materials by scraper, obtain water content at 5% moistening relatively granular or flaky solid-state dipotassium hydrogen phosphate, be convenient to carry out countercurrent flow, be unlikely to produce a large amount of airborne dusts at next step polymerization process and hot blast; Producing of C, potassium pyrophosphate: adopt bucket elevator to send into continuously in the horizontal polymerization furnace of rotation this solid-state dipotassium hydrogen phosphate, carry out countercurrent flow with the burning gas or the warm air that produce by hotblast stove, continue dehydration, polymerization under 560 ℃ of temperature, 280 ℃ of exhaust temperatures, generate potassium pyrophosphate, obtain the potassium pyrophosphate finished product through the cooling crushing packing; After the dipotassium hydrogen phosphate pressed powder that the tail gas of horizontal polymerization furnace of while is taken away is collected by tornado dust collector, can obtain anhydrous di-potassium hydrogen phosphate; Thoroughly wash remaining dipotassium hydrogen phosphate pressed powder by water wash column recirculated water more afterwards, utilize again in delivering to by blowback with recirculated water and in the still.
As shown in Figure 2, the method of two-step approach continuous production potassium pyrophosphate provided by the present invention also can be used for continuous production anhydrous di-potassium hydrogen phosphate solid, concrete steps are as follows: the producing of A, dipotassium hydrogen phosphate: with phosphoric acid and potassium hydroxide in and in the still reaction obtain dipotassium hydrogen phosphate solution, the proportion of control neutralizer is 1.5-1.8g/cm3, and pH value is 8.6-9.0; Being heating and curing of B, dipotassium hydrogen phosphate: dipotassium hydrogen phosphate solution sprayed to form thickness in the cylinder surface of the Rollingscratchboarddrier of continuous rotation be the material film of 0.5-1.5mm, be used to temperature from heat conducting oil boiler and be 200-340 ℃ thermal oil as heat-transfer medium to the heating of constantly conducting heat of the material film of cylinder surface, to the moisture that evaporates 92-97%, scrape leftover materials, obtain water content at the moistening relatively granular or flaky solid-state dipotassium hydrogen phosphate of 3-8% by scraper; Producing of C, anhydrous di-potassium hydrogen phosphate: adopt spiral conveyer, belt conveyor or bucket elevator to send into continuously in the horizontal polymerization furnace of rotation this solid-state dipotassium hydrogen phosphate, carry out countercurrent flow with the burning gas or the warm air that produce by hotblast stove, under 200-300 ℃ of temperature, continue dehydration, exhaust temperature is controlled at 100-150 ℃, obtain anhydrous di-potassium hydrogen phosphate, obtain anhydrous di-potassium hydrogen phosphate through the cooling crushing packing; After the dipotassium hydrogen phosphate pressed powder that the tail gas of horizontal polymerization furnace of while is taken away is collected by tornado dust collector, can obtain anhydrous di-potassium hydrogen phosphate; Thoroughly wash remaining dipotassium hydrogen phosphate pressed powder by water wash column recirculated water more afterwards, utilize again in delivering to by blowback with recirculated water and in the still.
In sum, crucial drying plant of the present invention is a Rollingscratchboarddrier, and it is little to have floor space, the dry tenacity height, and dry film-making step of granulating such as finishes at advantage.The whole production system required drive is little, noiselessness, no dust, environmental protection and energy saving.Especially with traditional last charging with soak down the material mode and change linearity into and layout behind the spray, effective drying surface brings up to 96% from 75%, has improved thermo-efficiency, has guaranteed that simultaneously the product evenness of discharge stablizes.The full intelligent automatic control of heat conducting oil boiler heating system, the safety coefficient height.
Claims (5)
1. the method for a two-step approach continuous production potassium pyrophosphate is characterized in that, comprises the steps:
Producing of A, dipotassium hydrogen phosphate: with phosphoric acid and potassium hydroxide in and in the still reaction obtain dipotassium hydrogen phosphate solution;
Being heating and curing of B, dipotassium hydrogen phosphate: it is the material film of 0.5-1.5mm that dipotassium hydrogen phosphate solution spray or the cylinder surface that soaks the Rollingscratchboarddrier that invests continuous rotation are formed thickness, be used to from the high temperature heat conductive oil of heat conducting oil boiler as heat-transfer medium the heating of constantly conducting heat of the material film of cylinder surface, to the moisture that evaporates 92-97%, scrape leftover materials, obtain water content at the moistening relatively granular or flaky solid-state dipotassium hydrogen phosphate of 3-8% by scraper;
Producing of C, potassium pyrophosphate: this solid-state dipotassium hydrogen phosphate is sent in the horizontal polymerization furnace of rotation continuously, carry out countercurrent flow with the burning gas or the warm air that produce by hotblast stove, continue dehydration, polymerization under 500-600 ℃ of temperature, generate potassium pyrophosphate, obtain the potassium pyrophosphate finished product through the cooling crushing packing.
2. the method for two-step approach continuous production potassium pyrophosphate according to claim 1 is characterized in that: in steps A, the proportion of control neutralizer is 1.5-1.8g/cm3, and pH value is 8.6-9.0.
3. the method for two-step approach continuous production potassium pyrophosphate according to claim 1 is characterized in that: in step B, the temperature of thermal oil is 200 ℃-340 ℃.
4. the method for two-step approach continuous production potassium pyrophosphate according to claim 1 is characterized in that: in step C, solid-state dipotassium hydrogen phosphate adopts spiral conveyer, belt conveyor or bucket elevator to send into continuously in the horizontal polymerization furnace of rotation.
5. according to the method for claim 1 or 4 described two-step approach continuous production potassium pyrophosphates, it is characterized in that: in step C, the dipotassium hydrogen phosphate pressed powder that the tail gas of horizontal polymerization furnace is taken away can obtain anhydrous di-potassium hydrogen phosphate after being collected by tornado dust collector; Thoroughly wash remaining dipotassium hydrogen phosphate pressed powder by water wash column recirculated water more afterwards, in delivering to by blowback with recirculated water and in the still.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538199A (en) * | 2011-12-29 | 2012-07-04 | 广西利达磷化工有限公司 | Method for absorbing and recycling yellow phosphorus burning heat by using heat-conducting oil |
| CN105967165A (en) * | 2016-07-04 | 2016-09-28 | 湖北兴发化工集团股份有限公司 | Production process and production device for electroplating grade potassium pyrophosphate |
| CN110371942A (en) * | 2019-08-01 | 2019-10-25 | 四川金地亚美科技有限公司 | A kind of returning charge process manufacture craft of heavy potassium pyrophosphate |
| CN110482510A (en) * | 2019-09-20 | 2019-11-22 | 瓮福达州化工有限责任公司 | A kind of preparation process of food grade phosphoric acid hydrogen dipotassium |
| CN112062116A (en) * | 2020-08-26 | 2020-12-11 | 华融化学股份有限公司 | Potassium pyrophosphate continuous production line, production method and production control system |
| CN113816355A (en) * | 2021-11-08 | 2021-12-21 | 云南云天化股份有限公司 | Method and device for preparing potassium pyrophosphate and co-producing water-soluble fertilizer through one-step dehydration polymerization |
| CN113942989A (en) * | 2021-11-30 | 2022-01-18 | 泰山石膏有限公司 | Device and method for continuously producing sodium trimetaphosphate by two-step method |
| WO2022257269A1 (en) * | 2021-06-11 | 2022-12-15 | 云南莱德福科技有限公司 | Slow-dissolving compound fertilizer containing potassium polyphosphate, preparation method therefor, and application thereof |
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| CN101708836A (en) * | 2009-12-11 | 2010-05-19 | 宜昌楚磷化工有限公司 | Method for preparing disodium dihydrogen pyrophosphate by adopting dynamic polymerization furnace |
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| GB939318A (en) * | 1959-12-23 | 1963-10-09 | Stauffer Chemical Co | Method for the manufacture of alkali metal polyphosphate compositions |
| CN101723342A (en) * | 2009-10-28 | 2010-06-09 | 广东光华化学厂有限公司 | Method for preparing electronic grade high-purity potassium permanganate |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538199A (en) * | 2011-12-29 | 2012-07-04 | 广西利达磷化工有限公司 | Method for absorbing and recycling yellow phosphorus burning heat by using heat-conducting oil |
| CN102538199B (en) * | 2011-12-29 | 2014-12-17 | 广西利达磷化工有限公司 | Method for absorbing and recycling yellow phosphorus burning heat by using heat-conducting oil |
| CN105967165A (en) * | 2016-07-04 | 2016-09-28 | 湖北兴发化工集团股份有限公司 | Production process and production device for electroplating grade potassium pyrophosphate |
| CN110371942A (en) * | 2019-08-01 | 2019-10-25 | 四川金地亚美科技有限公司 | A kind of returning charge process manufacture craft of heavy potassium pyrophosphate |
| CN110371942B (en) * | 2019-08-01 | 2023-05-09 | 四川金地亚美科技有限公司 | Production process of heavy potassium pyrophosphate returning flow |
| CN110482510A (en) * | 2019-09-20 | 2019-11-22 | 瓮福达州化工有限责任公司 | A kind of preparation process of food grade phosphoric acid hydrogen dipotassium |
| CN112062116A (en) * | 2020-08-26 | 2020-12-11 | 华融化学股份有限公司 | Potassium pyrophosphate continuous production line, production method and production control system |
| WO2022257269A1 (en) * | 2021-06-11 | 2022-12-15 | 云南莱德福科技有限公司 | Slow-dissolving compound fertilizer containing potassium polyphosphate, preparation method therefor, and application thereof |
| CN113816355A (en) * | 2021-11-08 | 2021-12-21 | 云南云天化股份有限公司 | Method and device for preparing potassium pyrophosphate and co-producing water-soluble fertilizer through one-step dehydration polymerization |
| CN113816355B (en) * | 2021-11-08 | 2023-08-22 | 云南云天化股份有限公司 | Method and device for preparing potassium pyrophosphate and co-producing water-soluble fertilizer through one-step dehydration polymerization |
| CN113942989A (en) * | 2021-11-30 | 2022-01-18 | 泰山石膏有限公司 | Device and method for continuously producing sodium trimetaphosphate by two-step method |
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| CN102001639B (en) | 2012-07-04 |
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