CN203976408U - A kind of polyphosphoric acid production system - Google Patents
A kind of polyphosphoric acid production system Download PDFInfo
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- CN203976408U CN203976408U CN201420317868.XU CN201420317868U CN203976408U CN 203976408 U CN203976408 U CN 203976408U CN 201420317868 U CN201420317868 U CN 201420317868U CN 203976408 U CN203976408 U CN 203976408U
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Abstract
The utility model discloses a kind of polyphosphoric acid production system, belong to technical field of phosphorous chemical industry.This system comprises refining phosphorus-melting groove, precipitation phosphorus-melting groove, combustion tower, one-level Hydrated structure, secondary Hydrated structure, dearsenification reactor, subsider, plate filter, desorption reactor, strainer and the finished product storage tank connecting successively by pipeline, the exhanst gas outlet of described secondary Hydrated structure is connected with flare system, described one-level Hydrated structure and secondary Hydrated structure are all the self-cycle structure being comprised of pipeline, hydration tower, shell and tube heat exchanger, recycle pump and circulatory pool, described circulatory pool is provided with and detects mouth, and described recycle pump is electrically connected to electric control box.This polyphosphoric acid production system can be produced the polyphosphoric acid of high-polymerization degree, low arsenic content.
Description
Technical field
The utility model belongs to technical field of phosphorous chemical industry, and particularly a kind of polyphosphoric acid production system relates in particular to the polyphosphoric acid production system of a kind of high polymerization, low arsenic content.
Background technology
The thirties in 20th century, the research of U.S. TVA is found, at ortho-phosphoric acid (H
3pO
4) and tetra-sodium (H
4p
2o
7) between have a kind of liquid phosphoric acid of eutectic composition.Its w (P
2o
5) be 76%, nearly 49% P wherein
2o
5with ortho-phosphoric acid form, exist, have 42% to be that tetra-sodium, 8% is tripolyphosphate (H
5p
3o
10), 1% be four polyphosphoric acid (H
6p
4o
13) exist.The mixed solution of this ortho-phosphoric acid and polyphosphoric acid is called polyphosphoric acid (polyphosphoric acid).Its molecular structure is configured to basis with line style open chain, so also referred to as linear condensation phosphoric acid.Polyphosphoric acid claims again four polyphosphoric acids, polymer phosphate or Tripyrophosphoric acid, and polyphosphoric acid is the glutinous thick liquid of a kind of water white transparency, and easily deliquescence, non-crystallizable, be corrosive, can with the miscible ortho-phosphoric acid that is hydrolyzed to of water.It is different from general strong phosphoric acid, is actually the miscellany of a series of phosphoric acid polymerization things.
Polyphosphoric acid has purposes widely in the industries such as pigment, pharmacy, spices, leather, fire retardant manufacture, such as in organic synthesis as cyclizing agent, souring agent and dewatering agent etc.Polyphosphoric acid can also be as the solution dewatering agent of holding concurrently, by the condensation reaction of 4-2 carboxylic acid thiazole and O-Phenylene Diamine, and synthetic Top Form Wormer food preservative.Polyphosphoric acid is not only important chemical industry intermediates, is also important Chemicals, also can be used as the surrogate of phosphoric acid etc.Polyphosphoric acid is as the acid of the new basic material of phosphorous chemical industry, compare with thermal phosphoric acid have advantages of incomparable.1, superfusibility matter, even store under cold condition, still keeps liquid; 2, corrodibility is little; 3, transportation equivalent P
2o
5trucking costs than common phosphoric acid, to economize 40%; 5, condensed phosphoric acid composition has good sequestering action to metal ion.Polyphosphoric acid just progressively replaces industrial phosphoric acid in a lot of fields and is widely used for this reason.
The industrial process of polyphosphoric acid mainly contains two kinds of Re Fa and wet methods.Hot method is mainly the thermal phosphoric acid production equipment based on traditional, and difference is only to supplement cooling technology mode; Wet method is mainly that phosphoric acid by wet process is concentrated through single-stage or multi-step evaporator heating, removes moisture and obtains.Both compare, and the feature of wet method is that product cost is relatively low, but product foreign matter content is higher, and use is restricted, mainly for the production of agricultural with chemical fertilizer and produce feed phosphate; The process characteristic of hot method is good product quality, and foreign matter content is low, but price is more expensive, is mainly used in producing various industrial phosphorus chemical products.China is just at the early-stage to the research of polyphosphoric acid, mainly adopts thermal phosphoric acid to produce polyphosphoric acid.In the production process of phosphoric acid by wet process, the slip that Rock Phosphate (72Min BPL) and sulfuric acid reaction produce after filtration, concentrate to improve the concentration of phosphoric acid.Conventionally the concentrated of acid is to carry out in dissimilar vacuum-evaporator, although go to guarantee to be heated evenly, due to high temperature and heat transfer ununiformity, acid can produce local superheating unavoidably in concentration process, makes heating container surface occur precipitation fouling.
The reason of the preparation method of polyphosphoric acid based on secret, pertinent data report is relatively less both at home and abroad, generally uses high temperature method of enrichment, and this method is all higher to the requirement of temperature, vacuum tightness and device, domestic conventional 85% H
3pO
4phosphoric acid adds the method for Vanadium Pentoxide in FLAKES and produces.Foreign data also shows, superheating phenomenon easily occurs in high temperature concentration process, very easily forms white depositions and is attached on reactor wall.Existing polyphosphoric acid technique is as follows.
1, heating method of enrichment: heat method of enrichment is to produce 1000 in the stove of a producer or immerseable
othe hot gas of C person's higher temperature, hot gas is imported into and in producer, fully contacts with acid and make it concentrated.There are a lot of shortcomings in this method, such as: when hot air temperature is too high, can carry a large amount of sour particulates needs to process, and these particulates easily form aerosol; In actually operating, be difficult to collect, cause sour loss, equipment corrosion seriously and topsoil.Simultaneously due to will be with 1000
othe hot flue gas of C, therefore energy consumption is high, and also acid easy local superheating phenomenon that occurs under hot conditions, in producer, easily form throw out, affect the long-term stability operation of producer.
2, electric energy method: by electro ultrafiltration on being placed on the electrode being equipped with in sour container, electric current flows between electrode and moment changes into heat, make acid boiling produce water vapour and may have the volatile material in phosphoric acid with other, along with the boiling that passes into of electric current is proceeded, make phosphoric acid become more and more denseer.According to United States Patent (USP) 2839408, phosphoric acid can be by being placed on DC electrode electrolytic enrichment wherein, and produce hydrogen and oxygen.The obvious shortcoming of this process is that the hydrogen producing can not be separated well with oxygen, is very easy to blast; In the process with this method concentrated wet-process phosphoric acid, fluorine cpd can pollute hydrogen and oxygen, and this will weaken their validity as raw material; Meanwhile, may cause the impurity in phosphoric acid to be separated out at electrode surface, affect the function of electrode.
3, absorption process: be the P that yellow phosphorus burning is obtained
2o
5, with cooling in advance phosphoric acid, carry out cooling and absorb, make polyphosphoric acid product.This method and the industrial thermal phosphoric acid resemble process of producing, difference is only to set up the cooling process system of phosphoric acid, liquid phosphorus sprays into burning hydrated tower with pressurized air from nozzle and burns, cold acid forms one deck sorrel along tower wall internal surface sprinkle, make combustion gases cooling, Vanadium Pentoxide in FLAKES and phosphoric acid polymerization generate polyphosphoric acid simultaneously.This method is produced with element phosphor, and the polyphosphoric acid product quality of its production is good, foreign matter content is low, but energy consumption is high, production cost is higher, causes product price more expensive.
4, synthesis method: by thermal phosphoric acid and Vanadium Pentoxide in FLAKES heated polymerizable, after purifying, cooling, filtration, makes polyphosphoric acid finished product.Synthetic legal system polyphosphoric acid have technical process short, invest low, simple to operate, pollute the advantages such as few, be investor's prefered method.The drawback of this method is to use thermal phosphoric acid and P
2o
5therefore production cost is higher.
5, with wet phosphoric acid purifying acid substitution thermal phosphoric acid: take wet phosphoric acid purifying acid as raw material acid, polyphosphoric acid through special heated polymerizable and purification process production, its quality product has reached the requirement of producing polyphosphoric acid with thermal phosphoric acid, greatly reduces the production cost of polyphosphoric acid.Have technique and be simple and easy to industrialization, the advantages such as production cost is low, energy consumption is low, cleanliness without any pollution, are a kind of production technique of better economic benefit.
In recent years, development along with fine chemistry industry, particularly at food, medical electronic material etc., need in the Application Areas of highly purified phosphoric acid and polyphosphoric acid, more strict to the requirement of arsenic impurities, and along with the enhancing of environmental consciousness, also need the polyphosphoric acid of a large amount of low arsenic content as industrial applications, therefore, a kind of low cost of needs and the effectively method of dearsenification.The enterprise of the polyphosphoric acid of China's production at present seldom (has pertinent literature to introduce Guizhou Wengfu group and is is just researching and developing food grade polyphosphoric acid, but domesticly yet there are no the report that food grade polyphosphoric acid is realized large-scale industrial production), be mainly because the rank of the polyphosphoric acid of producing is lower, do not reach client's requirement.
Summary of the invention
The utility model embodiment provides the polyphosphoric acid production system of a kind of low cost and low arsenic content.Described technical scheme is as follows: the utility model embodiment provides a kind of polyphosphoric acid production system, this system comprises the refining phosphorus-melting groove connecting successively by pipeline, precipitation phosphorus-melting groove, combustion tower, one-level Hydrated structure, secondary Hydrated structure, dearsenification reactor, subsider, plate filter, desorption reactor, strainer and finished product storage tank, the exhanst gas outlet of described secondary Hydrated structure is connected with flare system, described one-level Hydrated structure and secondary Hydrated structure are all by pipeline, hydration tower, shell and tube heat exchanger, the self-cycle structure that recycle pump and circulatory pool form, described circulatory pool is provided with and detects mouth, described recycle pump is electrically connected to electric control box.
Wherein, the polyphosphoric acid production system that the utility model embodiment provides also comprises the drum being connected with heat transfer tube in described combustion tower, and described drum is connected with described refining phosphorus-melting groove, precipitation phosphorus-melting groove, dearsenification reactor, desorption reactor and/or strainer by pipeline.
Wherein, the plate filter in the utility model embodiment divides two-way output, and a road outputs to described desorption reactor, and another road outputs to described dearsenification reactor.
Wherein, the top of a thousand pieces of gold for pressure strip described in push-and-pull 67 that filter press device in the utility model embodiment comprises two crossbeams 2 that support 1, support 1 top be arranged in parallel, the thrust plate 4 of being located at crossbeam 2 ends, slides and be located at filter plate 5 and the pressure strip 6 on crossbeam 2 and be located at crossbeam 2 front ends, described filter plate 5 is located between described thrust plate 4 and described pressure strip 6, and described thrust plate 4 is provided with opening for feed 13; Described filter plate 5 comprises stainless steel sheet frame 8 and the stainless steel filtering net 9 of sintering in described stainless steel sheet frame 8, one side of described stainless steel sheet frame 8 is provided with arc fluorine rubber gasket 10, opposite side is provided with the groove coordinating with arc fluorine rubber gasket 10 on adjacent stainless steel sheet frame 8, described stainless steel sheet frame 8 is provided with the through hole 11 corresponding with described opening for feed 13 and for the discharge nozzle 12 of discharging, described through hole 11 and discharge nozzle 12 are communicated with filter space.
Wherein, the quantity of the filter plate 5 in the utility model embodiment is 8-12 piece, and filtration area is 4-6 square metre, and the aperture of the filter opening of described stainless steel filtering net 9 is 30-50 μ m.
Wherein, the strainer in the utility model embodiment is the strainer with insulation jacket and filter core.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is:
1, native system adopts multiple stage circulation gradually to absorb, and adjusts the multiple technologies measures such as absorption temperature and specific absorption, can improve the polymerization degree of polyphosphoric acid, Improving The Quality of Products.
The phosphorus pentoxide content of the polyphosphoric acid that 2, native system generates is higher than 72.4%, arsenic content≤1ppm, lead content≤10ppm, superior product quality.
3, the filter press device in native system is specially for polyphosphoric acid design, and filter press device wherein does not need filter cloth, and simple in structure, processing ease.Meanwhile, do not need flocculating aids during this filter press device press filtration, process simultaneously in conjunction with sedimentation, during press filtration, solid content is few, once long with the filter press device time, substantially can realize serialization and produce, and has reduced workload.
4, native system by employing the strainer with insulation jacket and filter core, make product under differing temps, can make the metal sulfide precipitation thing removal of impurities on request in product, reach standard.
5, native system discharges a large amount of heat energy by yellow phosphorus burning, by drum, is transported in each parts that need to heat, and reaches good energy-saving effect and environmental benefit.
Accompanying drawing explanation
Fig. 1 is that the tail that the utility model embodiment provides is washed the structured flowchart of the treatment system of waste phosphoric acid;
Fig. 2 is the structural representation of the filter press device of processing for phosphorus product dearsenification that provides of the utility model embodiment;
Fig. 3 is the side-view of the filter press device of processing for phosphorus product dearsenification that provides of the utility model embodiment;
Fig. 4 is the structural representation of the filter plate that provides of the utility model embodiment.
In figure: 1 support, 2 crossbeams, 3 stock pans, 4 thrust plates, 5 filter plates, 6 pressure strips, 7 a thousand pieces of gold tops, 8 stainless steel sheet frames, 9 stainless steel filtering nets, 10 arc fluorine rubber gaskets, 11 through holes, 12 discharge nozzles, 13 opening for feeds, 14 holder ears.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail.
Referring to Fig. 1, the utility model embodiment provides a kind of polyphosphoric acid production system, this system comprises refining phosphorus-melting groove, precipitation phosphorus-melting groove, combustion tower, one-level Hydrated structure, secondary Hydrated structure, dearsenification reactor, subsider, plate filter, desorption reactor, strainer and the finished product storage tank etc. that connect successively by pipeline, wherein, refining phosphorus-melting groove and precipitation phosphorus-melting groove are all provided with insulation jacket, for refining and molten yellow phosphorus.The exhanst gas outlet of secondary Hydrated structure is connected with flare system for carrying out vent gas treatment.One-level Hydrated structure and secondary Hydrated structure are all the self-cycle structure being comprised of pipeline, hydration tower, shell and tube heat exchanger, recycle pump and circulatory pool, and circulatory pool is provided with and detects mouth, and recycle pump is electrically connected to electric control box.Particularly, one-level hydration tower, one-level shell and tube and one-level circulatory pool connect to form circulation loop from beginning to end after connecting by pipeline, and this pipeline is provided with one-level recycle pump, and one-level recycle pump is arranged on one-level circulatory pool, be also provided with and detect mouth on one-level circulatory pool.Secondary hydration tower, secondary shell and tube and secondary circulatory pool connect to form circulation loop from beginning to end after connecting by pipeline, and this pipeline is provided with secondary recycle pump, and secondary recycle pump is arranged on secondary circulatory pool, be also provided with and detect mouth on secondary circulatory pool.One-level recycle pump and secondary recycle pump are electrically connected to electric control box, by electric control box, can control the time (working time) of hydration and the speed (running frequency of change speed motor) of circulation, can control the polymerization degree by controlling the modes such as absorption temperature and specific absorption, what satisfy condition enters next structure, if do not satisfied condition, continues circulation.
Wherein, referring to Fig. 1, the polyphosphoric acid production system that the utility model embodiment provides also comprises the drum being connected with heat transfer tube in combustion tower, and this drum is connected for the heat of yellow phosphorus burning is used for to other operations with refining phosphorus-melting groove, precipitation phosphorus-melting groove, dearsenification reactor, desorption reactor and/or strainer by pipeline.
Wherein, referring to Fig. 1, plate filter in the utility model embodiment divides two-way output and on output terminal, is provided with the detection mouth for detection of arsenic content, and a road (arsenic content detection is qualified) outputs to desorption reactor, and another road (arsenic content detection is defective) outputs to dearsenification reactor.
Referring to Fig. 2-4, the strainer in the utility model embodiment comprises the two crossbeam 2(along continuous straight runs settings that support 1, support 1 top be arranged in parallel), the thrust plate 4(that is located at crossbeam 2 ends is fixed on support 1), the top of a thousand pieces of gold for push-and-pull pressure strip 67 etc. of sliding and being located at filter plate 5 on crossbeam 2 and pressure strip 6 and being located at crossbeam 2 front ends.Wherein, filter plate 5 is located between thrust plate 4 and pressure strip 6, and filter plate 5 and pressure strip 6 are located between two crossbeams 2, and thrust plate 4 is provided with opening for feed 13.Thrust plate 4, filter plate 5 and pressure strip 6 are square structure, all by stainless steel, are made, and all (perpendicular to crossbeam 2) are vertically set, and pressure strip 6 is vertically fixed or is resisted against on the movable end on a thousand pieces of gold top 7.Aforementioned structure and existing plate-and-frame filter press are basic identical, the pressure filter difference that the utility model embodiment provides is: the filter plate 5 in the present embodiment comprises stainless steel sheet frame 8 and the sintering stainless steel filtering net 9 in stainless steel sheet frame 8, stainless steel sheet frame 8 is rectangular frame structure, has been covered with a large amount of filter openings on stainless steel filtering net 9.One side of stainless steel sheet frame 8 is provided with arc fluorine rubber gasket 10, opposite side is provided with the groove coordinating with arc fluorine rubber gasket 10 on adjacent stainless steel sheet frame 8, said structure has guaranteed the stopping property of this filter press device, during use, filter plate 5 is hung on crossbeam side by side with same direction (arc fluorine rubber gasket 10 all in the same direction).Stainless steel sheet frame 8 is provided with the through hole corresponding with opening for feed 13 11 and adopts closed delivery for the discharge nozzle 12(of discharging, which is provided with valve), through hole and opening for feed 13 are positioned at and on same level straight line, form a feeding-passage being communicated with, between adjacent stainless steel filtering net 9 and stainless steel sheet frame 8, form the filter space of sealing, through hole 11 and discharge nozzle 12 are communicated with filter space.Wherein, stainless steel sheet frame 8 both sides are provided with holder ear 14, and holder ear 14 is placed on crossbeam 2, on two jiaos of stainless steel sheet frame 8 top margins, is respectively provided with a through hole 11, and accordingly, the top of thrust plate 4 is provided with two opening for feeds 13.
Wherein, the crossbeam 2 in the utility model embodiment is horizontally disposed pipe, and pressure strip 6 both sides are provided with roller accordingly, and roller and Tuo Er 14 slide on this pipe.
Wherein, the quantity of the filter plate 5 in the utility model embodiment is 8-12 piece, and filtration area is 4-6 square metre.
Wherein, the aperture of the filter opening of the stainless steel filtering net 9 in the utility model embodiment is 30-50 μ m, to guarantee phosphoric acid and the good filter effect of polyphosphoric acid.
Wherein, the width of the arc fluorine rubber gasket 10 in the utility model embodiment is 6-10mm, and thickness is 6-10mm.
Particularly, in the stainless steel sheet frame 8 in the utility model embodiment, sintering has multi-layer stainless mesh 9 to guarantee filter effect side by side, is specifically as follows five layers.
Further, referring to Fig. 2, the filter press device in the utility model embodiment also comprises that the stock pan 3 of being located on support 1 is for receiving filter residue, this stock pan 3 be positioned at filter plate 5 under.
Particularly, the discharge port of dearsenification reactor is connected with the inlet flume of subsider by pipeline, and the overflow groove of subsider is connected with opening for feed 13 by the pipeline with pump, and subsider bottom is provided with mud mouth; (which is provided with detect mouthful) minute two-way output that pools together of the discharge nozzle 12 of filter press device, a road outputs to desorption reactor and carries out subsequent disposal, and the pipeline of separately leading up to is connected for dearsenification again with dearsenification reactor.
Wherein, the strainer in the utility model embodiment is the strainer with insulation jacket and filter core, and band insulation jacket is located on filter cylinder, and filter core is located in filter cylinder by card.
The index of the polyphosphoric acid of the production by this system is as shown in table 1 after testing:
Table 1
| Project | Technical indicator |
| Outward appearance | Colourless to light thick liquid |
| Content is (with P 2O 5Count) % >= | 76-84 |
| Content is (with H 3PO 4Count) % >= | 105-116.0 |
| Vitriol (SO 4）% ≤ | 0.003 |
| Iron (Fe) %≤ | 0.002 |
| Muriate (Cl) %≤ | 0.001 |
| Heavy metal (Pb) %≤ | 0.001 |
| Arsenic content % in AS≤ | 0.0001 |
As can be seen from the above table, the phosphorus pentoxide content of the polyphosphoric acid that this system is produced is 76-84%, and arsenic content is less than 0.0001%, and this system can be produced the polyphosphoric acid of high-polymerization degree, low arsenic content.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. a polyphosphoric acid production system, it is characterized in that, comprise the refining phosphorus-melting groove connecting successively by pipeline, precipitation phosphorus-melting groove, combustion tower, one-level Hydrated structure, secondary Hydrated structure, dearsenification reactor, subsider, plate filter, desorption reactor, strainer and finished product storage tank, the exhanst gas outlet of described secondary Hydrated structure is connected with flare system, described one-level Hydrated structure and secondary Hydrated structure are all by pipeline, hydration tower, shell and tube heat exchanger, the self-cycle structure that recycle pump and circulatory pool form, described circulatory pool is provided with and detects mouth, described recycle pump is electrically connected to electric control box.
2. polyphosphoric acid production system according to claim 1, it is characterized in that, described polyphosphoric acid production system also comprises the drum being connected with heat transfer tube in described combustion tower, and described drum is connected with described refining phosphorus-melting groove, precipitation phosphorus-melting groove, dearsenification reactor, desorption reactor and/or strainer by pipeline.
3. polyphosphoric acid production system according to claim 1, is characterized in that, described plate filter divides two-way output, and a road outputs to described desorption reactor, and another road outputs to described dearsenification reactor.
4. polyphosphoric acid production system according to claim 1, it is characterized in that, the top of a thousand pieces of gold for pressure strip described in push-and-pull (6) (7) that described plate filter comprises two crossbeams (2) that be arranged in parallel above support (1), support (1), the thrust plate (4) of being located at crossbeam (2) end, slides and be located at filter plate (5) and the pressure strip (6) on crossbeam (2) and be located at crossbeam (2) front end, described filter plate (5) is located between described thrust plate (4) and pressure strip (6), and described thrust plate (4) is provided with opening for feed (13);
Described filter plate (5) comprises stainless steel sheet frame (8) and the sintering stainless steel filtering net (9) in described stainless steel sheet frame (8), one side of described stainless steel sheet frame (8) is provided with arc fluorine rubber gasket (10), opposite side is provided with the groove coordinating with arc fluorine rubber gasket (10) on adjacent stainless steel sheet frame (8), described stainless steel sheet frame (8) is provided with the through hole (11) corresponding with described opening for feed (13) and for the discharge nozzle (12) of discharging, described through hole (11) and discharge nozzle (12) are communicated with filter space.
5. polyphosphoric acid production system according to claim 4, is characterized in that, the quantity of described filter plate (5) is 8-12 piece, and filtration area is 4-6 square metre, and the aperture of the filter opening of described stainless steel filtering net (9) is 30-50 μ m.
6. polyphosphoric acid production system according to claim 1, is characterized in that, described strainer is the strainer with insulation jacket and filter core.
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|---|---|---|---|---|
| CN106958028A (en) * | 2017-05-22 | 2017-07-18 | 江苏三吉利化工股份有限公司 | A kind of membrane electrolysis of three Room two prepares the device of high-purity TPAOH |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958028A (en) * | 2017-05-22 | 2017-07-18 | 江苏三吉利化工股份有限公司 | A kind of membrane electrolysis of three Room two prepares the device of high-purity TPAOH |
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