CN103011106B - Production device of food-grade phosphoric acid - Google Patents
Production device of food-grade phosphoric acid Download PDFInfo
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- CN103011106B CN103011106B CN201210579867.8A CN201210579867A CN103011106B CN 103011106 B CN103011106 B CN 103011106B CN 201210579867 A CN201210579867 A CN 201210579867A CN 103011106 B CN103011106 B CN 103011106B
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- Prior art keywords
- phosphoric acid
- pump
- degassing tower
- dearsenification
- acid
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 226
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000007872 degassing Methods 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims description 51
- 238000012856 packing Methods 0.000 claims description 25
- 239000007921 spray Substances 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 34
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 34
- 229910052785 arsenic Inorganic materials 0.000 abstract description 13
- 239000003795 chemical substances by application Substances 0.000 abstract description 13
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 12
- CYQAYERJWZKYML-UHFFFAOYSA-N phosphorus pentasulfide Chemical compound S1P(S2)(=S)SP3(=S)SP1(=S)SP2(=S)S3 CYQAYERJWZKYML-UHFFFAOYSA-N 0.000 abstract description 12
- 238000001914 filtration Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 abstract description 6
- 239000002893 slag Substances 0.000 abstract description 5
- 230000035484 reaction time Effects 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract 6
- 239000007924 injection Substances 0.000 abstract 6
- 239000000945 filler Substances 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 235000011007 phosphoric acid Nutrition 0.000 description 93
- 238000000034 method Methods 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 229920000137 polyphosphoric acid Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 150000003016 phosphoric acids Chemical class 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- -1 after filtration Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 235000013355 food flavoring agent Nutrition 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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- Degasification And Air Bubble Elimination (AREA)
Abstract
The invention discloses a production device of a food-grade phosphoric acid. The production device is mainly provided with an arsenic-removing reactor, an injection pump, a circulating pump I, a plate-type filter, a degassing tower, an air purifier, a circulating pump II and a finished product tank. The injection pump, the arsenic-removing reactor, the circulating pump I, the plate-type filter, the degassing tower, the circulating pump II and the finished product tank are connected in turn; and the injection pump is arranged on a top of the arsenic-removing reactor and respectively connected with an H2S (hydrogen sulfide) gas outlet and the circulating pump I. The circulating pump I of the device is used for conveying industrial phosphoric acid to the injection pump; the injection pump is used for sucking and fully reacting the hydrogen sulfide gas of the degassing tower, and then spraying the reacted hydrogen sulfide gas on an arsenic-removing phosphoric acid liquid level to go on reacting; the arsenic-removed phosphoric acid is conveyed to the degassing tower after being subjected to filtering and arsenic slag removal; the arsenic-removed phosphoric acid is conveyed to a filler layer via the circulating pump II and contacted with purified air countercurrent; the removed hydrogen sulfide is recycled by the injection pump, so that the utilization amount of a P2S5 (phosphorus pentasulfide) arsenic-removing agent is reduced, the reaction time is shortened and the secondary pollution is avoided; and the device has good economical, social and ecological benefits.
Description
technical field:
The invention belongs to phosphorous chemical industry technology and environmental protection technical field, relate to a kind of production equipment of food grade phosphoric acid.
background technology:
Phosphorus is important bioelement, and foodstuff additive phosphoric acid, as the nutrition agent of acidic flavoring agent, yeast, is widely used in foodstuffs industry.Impurity index request in food grade phosphoric acid is strict especially.At present, food grade phosphoric acid produces that main to adopt industrial phosphoric acid be raw material, and in production process, the technology that removes that removes arsenic especially of impurity is very important.
The method of phosphoric acid dearsenification mainly contains: 1. sulphide precipitation: by add certain precipitation agent in phosphate raw material, its production indissoluble or insoluble compound are separated out, be then isolated low-arsenic phosphorus acid product by strainer.2. solvent extration: dissolve in organic solvent based on phosphoric acid, arsenic impurities is extracted out, thus make its separation.3. ion exchange method: process phosphoric acid with strong-acid ion exchange resin, thereby go out arsenic impurities.Sulphide precipitation is because of required step and equipment is simple and dearsenification is effective, is the most frequently used arsenic removing method.The principle of phosphoric acid sulphide precipitation dearsenification is as follows:
2P
2S
5 + 16H
2O → 4H
3PO
4 + 10H
2S↑
H
3AsO
4 + H
2S → H
3AsO
3 + H
2O + S↓
H
3AsO
3 + 3H
2S → 6H
2O + As
2S
3↓
By adding thiophosphoric anhydride to carry out dearsenification reaction in industrial phosphoric acid, remove by filter precipitation and obtain dearsenification phosphoric acid, conventionally in order to guarantee the effect of dearsenification, the dosage of thiophosphoric anhydride dearsenic agent all can be suitably excessive, this has just caused after dearsenification nubbin hydrogen sulfide in phosphoric acid, therefore must manage to remove.
At present, food grade phosphoric acid production process route is divided into two kinds of Re Fa and wet methods.The gordian technique of two kinds of route production food grade phosphoric acids is all removing of impurity.In prior art, be by the phosphoric acid after dearsenification, adopt aeration to remove hydrogen sulfide.For example:
Chinese patent 200910062940.2 has proposed a kind of method with producing food grade phosphoric acid with refined wet phosphoric acid, by adding active silica to do defluorinating agent, add sodium sulfide solution or thiophosphoric anhydride solid to do dearsenification deleading reagent, after filtration, filtrate is sent to aeration workshop section, constantly blast air and stir, finally filtering and obtain food grade phosphoric acid.This method is with low cost, less energy consumption, pollution-free.
At " polyphosphoric acid and dearsenicating technology research thereof " (Yunnan chemical, 2007,34(4): 63～66) in a literary composition, introduce the difference of polyphosphoric acid and common thermal phosphoric acid physico-chemical property, and present situation and the market outlook of at present domestic and international polyphosphoric acid, propose the impact of arsenic impurities on polyphosphoric acid, and summarized several arsenic removing methods that current phosphoric acid extensively adopts.This article is pointed out, the dearsenic agent of preparation is joined in reactor and reacted with the arsenus acid in phosphoric acid, generates As
2s
3precipitation, then will be containing As
2s
3phosphoric acid be pumped into and in degassing tower, slough unnecessary H
2s gas, then deliver in strainer and filter, phosphoric acid product enters pan tank, filter residue As
2s
3enter slag cylinder, tail gas is discharged in atmosphere through blower fan after washing tower washing is up to standard.
At " producing food grade phosphoric acid by industrial phosphoric acid operate continuously " (design of sulphur phosphorus and powder technology, 2005,6:27～30) literary composition and " brief talking Continuous Heat method food grade phosphoric acid produces " (guizhou chemical industry, 2005,30(4): 43～45) in a literary composition, all mentioned the removal methods of the rear remaining hydrogen sulfide of dearsenification reaction during food grade phosphoric acid is produced.This method is to blast air by gas blower dearsenification phosphoric acid stripping is removed to hydrogen sulfide, and the hydrogen sulfide of stripping absorbs with sodium carbonate solution, gained sodium sulfide solution for the production of other to the less demanding phosphoric acid salt of sulphur content.The arsenic slag that filtration is collected transports Shen Pin factory to after washing, being dried.This method is simple to operate, and good impurity removing effect avoid hydrogen sulfide directly to discharge and cause environmental pollution, but its absorption agent uses sodium carbonate, introduces sodium ion, causes to a certain extent secondary pollution.From economic benefit and social benefit analysis, this method is not optimal selection.
We,, according to for many years to having the research for the degassed purification techniques of food grade phosphoric acid dearsenification, set out in conjunction with phosphoric acid production is actual, have researched and developed a kind of production equipment of food grade phosphoric acid.Through looking into all the other documents, in industrial phosphoric acid dearsenification purifies, all there is not the jet-type of use stirring reaction device, in the degassed purification of food grade phosphoric acid, all there is not the tower de-gassing vessel of use.Adopt industrial phosphoric acid of the present invention to produce food grade phosphoric acid device; can complete more quickly dearsenification reaction process; hydrogen sulfide in stripping phosphoric acid is also recycled more fully effectively; shorten the cycling time of degasification process; reduce the consumption of thiophosphoric anhydride dearsenic agent; avoid secondary pollution, effectively protect factory and surrounding enviroment, there are good economic benefit, social benefit and ecological benefits.
summary of the invention:
Object of the present invention: be the problems of the prior art in order to solve the degassed purification of food grade phosphoric acid production process dearsenification, shorten dearsenification and react and remove the time of hydrogen sulfide, improve the production efficiency of food grade phosphoric acid and the continuity of production, fully recycle the hydrogen sulfide in degassing process, reduce the use cost of dearsenic agent, avoid the secondary pollution of obnoxious flavour hydrogen sulfide, increase economic efficiency, social benefit and ecological benefits, a kind of production equipment of food grade phosphoric acid is provided.
Technical scheme of the present invention is:
Dearsenification reactor arranges recycle pump I and squirt pump, industrial phosphoric acid is delivered to squirt pump by recycle pump I, the negative pressure producing sucks hydrogen sulfide fully react with industrial phosphoric acid at squirt pump mixing section, separately realizing turbulent flow at dearsenification reactive tank stirs, shorten the cycling time of dearsenification reaction, phosphoric acid after dearsenification is complete is delivered to degassing tower after plate filter elimination arsenic slag, dearsenification phosphoric acid is delivered to packing layer by recycle pump II, dearsenification phosphoric acid is in packing layer and the counter current contact that purifies air, internal recycle fully removes hydrogen sulfide, the hydrogen sulfide being removed enters squirt pump by the air outlet of degassed tower top and fully recycles under the effect of negative pressure, reduce the consumption of thiophosphoric anhydride dearsenic agent, avoid secondary pollution, effectively protect factory and surrounding enviroment.
The present invention is achieved in that
A production equipment for food grade phosphoric acid, is characterized in that: dearsenification reactor, squirt pump, recycle pump I, plate filter, degassing tower, air purifier, recycle pump II and finished pot are mainly set; Squirt pump, dearsenification reactor, recycle pump I, plate filter, degassing tower, recycle pump II and finished pot adopt pipe connecting to be connected successively; The top of described dearsenification reactor arranges squirt pump, and squirt pump upper end acid inlet adopts pipe connecting to be connected with the acid mouth circulation of recycle pump I and dearsenification reactor bottom, and squirt pump upper end inlet mouth adopts pipe connecting separately and the H on degassing tower top
2s air outlet connects, and squirt pump lower end liquid outlet arranges higher than dearsenification phosphoric acid liquid level; The acid inlet of described recycle pump II adopts pipe connecting to be connected with the acid mouth of degassing tower bottom, and the acid mouth of recycle pump II adopts pipe connecting to be connected with the spray header on the packing layer of degassing tower top.
Above-described dearsenification reactor head separately arranges P
2s
5dog-house and industrial phosphoric acid import.
Above-described air purifier is arranged between the packing layer and phosphoric acid liquid level of degassing tower.
Above-described plate filter adopts pipe connecting to be connected with the spray header at degassing tower middle part.
Above-described finished pot top arranges acid inlet, and finished pot bottom arranges acid mouth.
Above-described acid inlet and acid mouth arrange respectively flange and valve.
Above-described dearsenification reactor, squirt pump, recycle pump I, plate filter, degassing tower, recycle pump II, finished pot, flange and connecting tube all adopt 316L or 304 stainless materials to make.
The material of the above packing layer is the one in plastics Raschig ring, stainless steel Raschig ring and ceramic raschig rings.
The above degassing tower adopts negative-pressure operation.
Principle of work of the present invention is:
From the P of dearsenification reactor
2s
5dog-house and industrial phosphoric acid import add respectively thiophosphoric anhydride and industrial phosphoric acid, recycle pump I by industrial phosphoric acid positive delivery to squirt pump, under high pressure the material high-speed of industrial phosphoric acid in from squirt pump acid mouth to reactive tank sprays, dearsenification reaction is carried out fast fully, the hydrogen sulfide that the negative pressure that squirt pump produces simultaneously produces degassing process sucks in squirt pump and reacts with industrial phosphoric acid, a phosphoric acid part after dearsenification is for internal recycle, another part is delivered to degassing tower and carries out hydrogen sulfide stripping after plate filter filters, hydrogen sulfide stripping is delivered to packing layer by recycle pump II by dearsenification phosphoric acid, dearsenification phosphoric acid is in packing layer and the counter current contact that purifies air, internal recycle fully removes hydrogen sulfide, the hydrogen sulfide being removed under the effect of negative pressure by the H of degassed tower top
2s air outlet enters squirt pump and fully recycles, and the phosphoric acid part after degassed is for internal recycle, and another part is delivered to finished pot and obtains food grade phosphoric acid.
Advantage of the present invention and positively effect:
This device adopts recycle pump I that industrial phosphoric acid is delivered to squirt pump, the negative pressure producing sucks hydrogen sulfide fully react with industrial phosphoric acid at squirt pump mixing section, be sprayed on dearsenification phosphoric acid liquid level again and continue reaction, the phosphoric acid after dearsenification is complete is delivered to degassing tower after plate filter elimination arsenic slag.Dearsenification phosphoric acid is delivered to packing layer by recycle pump II, and dearsenification phosphoric acid, in packing layer and the counter current contact that purifies air, fully removes hydrogen sulfide, the hydrogen sulfide being removed under the effect of negative pressure by the H of degassed tower top
2s air outlet enters squirt pump and fully recycles, and has reduced the consumption of thiophosphoric anhydride dearsenic agent, has shortened the reaction times, avoids secondary pollution, effectively protects factory and surrounding enviroment, has good economic benefit, social benefit and ecological benefits.
accompanying drawing explanation:
Fig. 1: be structural representation of the present invention.
In figure, identify: 1-dearsenification reactor; 2-P
2s
5dog-house; The import of 3-industrial phosphoric acid; 4-squirt pump; 5, squirt pump acid inlet; 6-H
2s inlet mouth; 7-recycle pump I; 8-plate filter; 9-H
2s air outlet; 10-packing layer; 11-degassing tower; 12-air purifier; 13-recycle pump II; 14-finished pot.
embodiment:
Below in conjunction with embodiment, the present invention is described in detail.
embodiment mono-:
The production equipment that adopts this food grade phosphoric acid of 316L stainless material making, mainly arranges dearsenification reactor 1, squirt pump 4, recycle pump I 7, plate filter 8, degassing tower 11, air purifier 12, recycle pump II 13 and finished pot 14; Squirt pump 4, dearsenification reactor 1, recycle pump I 7, plate filter 8, degassing tower 11, recycle pump II 13 and finished pot 14 adopt pipe connecting to be connected successively.The top of dearsenification reactor 1 arranges squirt pump 4, P
2s
5dog-house 2 and industrial phosphoric acid import 3; Squirt pump 4 upper end acid inlets adopt pipe connecting to be connected with the acid mouth circulation of recycle pump I 7 and dearsenification reactor 1 bottom, and squirt pump 4 upper end inlet mouths adopt pipe connecting separately and the H on degassing tower 11 tops
2s air outlet 9 connects, and squirt pump 4 lower end liquid outlets arrange higher than dearsenification phosphoric acid liquid level.The acid inlet of described recycle pump II 13 adopts pipe connecting to be connected with the acid mouth of degassing tower 11 bottoms, and the acid mouth of recycle pump II 13 adopts pipe connecting to be connected with the spray header on degassing tower 11 top packing layers 10.
Described air purifier 12 is arranged between the packing layer 10 and phosphoric acid liquid level of degassing tower 11.Plate filter 8 adopts pipe connecting to be connected with the spray header at degassing tower 11 middle parts.Finished pot 14 tops arrange acid inlet, and finished pot 14 bottoms arrange acid mouth.At each acid inlet and acid mouth, flange and valve are set respectively.Described packing layer 10 adopts stainless steel Raschig ring.
When work, open the P of dearsenification reactor
2s
5the valve of dog-house cover plate and industrial phosphoric acid import, adds respectively thiophosphoric anhydride and industrial phosphoric acid, and in dearsenic agent thiophosphoric anhydride and industrial phosphoric acid, the ratio of arsenic content is 1.3:1, and add-on is the liquid level of reactor volume 1/2-4/5.By the acid inlet of recycle pump I with to the acid mouth valve open of squirt pump, by industrial phosphoric acid positive delivery to squirt pump, under high pressure the material high-speed of industrial phosphoric acid in from squirt pump acid mouth to reactive tank sprays, dearsenification reaction is carried out fast fully, the hydrogen sulfide that the negative pressure that squirt pump produces simultaneously produces degassing process sucks in squirt pump and reacts with industrial phosphoric acid, and be sprayed on dearsenification phosphoric acid liquid level continue reaction, a phosphoric acid part after dearsenification is for internal recycle, another part is opened through plate filter valve, dearsenification phosphoric acid is delivered to degassing tower after filtering and carries out hydrogen sulfide stripping, open the acid inlet of recycle pump II and to degassing tower 11 top packing layer 10 acid mouth valves, dearsenification phosphoric acid is delivered to packing layer by recycle pump II, dearsenification phosphoric acid is in packing layer and the counter current contact that purifies air, internal recycle fully removes hydrogen sulfide, the hydrogen sulfide being removed under the effect of negative pressure by the H of degassed tower top
2s air outlet enters squirt pump and fully recycles, and the phosphoric acid part after degassed is for internal recycle, and another part is opened the valve that recycle pump II is led to finished pot, is delivered to finished pot and obtains food grade phosphoric acid.
embodiment bis-:
The production equipment that adopts this food grade phosphoric acid of 304 stainless materials making, mainly arranges dearsenification reactor 1, squirt pump 4, recycle pump I 7, plate filter 8, degassing tower 11, air purifier 12, recycle pump II 13 and finished pot 14; Squirt pump 4, dearsenification reactor 1, recycle pump I 7, plate filter 8, degassing tower 11, recycle pump II 13 and finished pot 14 adopt pipe connecting to be connected successively.The top of dearsenification reactor 1 arranges squirt pump 4, P
2s
5dog-house 2 and industrial phosphoric acid import 3; Squirt pump 4 upper end acid inlets adopt pipe connecting to be connected with the acid mouth circulation of recycle pump I 7 and dearsenification reactor 1 bottom, and squirt pump 4 upper end inlet mouths adopt pipe connecting separately and the H on degassing tower 11 tops
2s air outlet 9 connects, and squirt pump 4 lower end liquid outlets arrange higher than dearsenification phosphoric acid liquid level.The acid inlet of described recycle pump II 13 adopts pipe connecting to be connected with the acid mouth of degassing tower 11 bottoms, and the acid mouth of recycle pump II 13 adopts pipe connecting to be connected with the spray header on degassing tower 11 top packing layers 10.
Described air purifier 12 is arranged between the packing layer 10 and phosphoric acid liquid level of degassing tower 11.Plate filter 8 adopts pipe connecting to be connected with the spray header at degassing tower 11 middle parts.Finished pot 14 tops arrange acid inlet, and finished pot 14 bottoms arrange acid mouth.At each acid inlet and acid mouth, flange and valve are set respectively.Described packing layer 10 adopts plastics Raschig ring.
When work, open the P of dearsenification reactor
2s
5the valve of dog-house cover plate and industrial phosphoric acid import, adds respectively thiophosphoric anhydride and industrial phosphoric acid, and in dearsenic agent thiophosphoric anhydride and industrial phosphoric acid, the ratio of arsenic content is 1.3:1, and add-on is the liquid level of reactor volume 1/2-4/5.By the acid inlet of recycle pump I with to the acid mouth valve open of squirt pump, by industrial phosphoric acid positive delivery to squirt pump, under high pressure the material high-speed of industrial phosphoric acid in from squirt pump acid mouth to reactive tank sprays, dearsenification reaction is carried out fast fully, the hydrogen sulfide that the negative pressure that squirt pump produces simultaneously produces degassing process sucks in squirt pump and reacts with industrial phosphoric acid, and be sprayed on dearsenification phosphoric acid liquid level continue reaction, a phosphoric acid part after dearsenification is for internal recycle, another part is opened through plate filter valve, dearsenification phosphoric acid is delivered to degassing tower after filtering and carries out hydrogen sulfide stripping, open the acid inlet of recycle pump II and to degassing tower 11 top packing layer 10 acid mouth valves, dearsenification phosphoric acid is delivered to packing layer by recycle pump II, dearsenification phosphoric acid is in packing layer and the counter current contact that purifies air, internal recycle fully removes hydrogen sulfide, the hydrogen sulfide being removed under the effect of negative pressure by the H of degassed tower top
2s air outlet enters squirt pump and fully recycles, and the phosphoric acid part after degassed is for internal recycle, and another part is opened the valve that recycle pump II is led to finished pot, is delivered to finished pot and obtains food grade phosphoric acid.
Claims (8)
1. a production equipment for food grade phosphoric acid, is characterized in that: dearsenification reactor (1), squirt pump (4), recycle pump I (7), plate filter (8), degassing tower (11), air purifier (12), recycle pump II (13) and finished pot (14) are mainly set; Squirt pump (4), dearsenification reactor (1), recycle pump I (7), plate filter (8), degassing tower (11), recycle pump II (13) and finished pot (14) adopt pipe connecting to be connected successively; The top of described dearsenification reactor (1) arranges squirt pump (4), squirt pump (4) upper end acid inlet adopts pipe connecting to be connected with the acid mouth circulation of recycle pump I (7) and dearsenification reactor (1) bottom, and squirt pump (4) upper end inlet mouth adopts pipe connecting separately and the H on degassing tower (11) top
2s air outlet (9) connects, and squirt pump (4) lower end liquid outlet arranges higher than dearsenification phosphoric acid liquid level; The acid inlet of described recycle pump II (13) adopts pipe connecting to be connected with the acid mouth of degassing tower (11) bottom, and the acid mouth of recycle pump II (13) adopts pipe connecting to be connected with the spray header on degassing tower (11) top packing layer (10).
2. the production equipment of a kind of food grade phosphoric acid according to claim 1, is characterized in that: described dearsenification reactor (1) top separately arranges P
2s
5dog-house (2) and industrial phosphoric acid import (3).
3. the production equipment of a kind of food grade phosphoric acid according to claim 1, is characterized in that: described air purifier (12) is arranged between the packing layer (10) and phosphoric acid liquid level of degassing tower (11).
4. the production equipment of a kind of food grade phosphoric acid according to claim 1, is characterized in that: described plate filter (8) adopts pipe connecting to be connected with the spray header at degassing tower (11) middle part.
5. the production equipment of a kind of food grade phosphoric acid according to claim 1, is characterized in that: described finished pot (14) top arranges acid inlet, and finished pot (14) bottom arranges acid mouth.
6. a kind of production equipment of food grade phosphoric acid according to claim 1 or 5, is characterized in that: described acid inlet and acid mouth arrange respectively flange and valve.
7. the production equipment of a kind of food grade phosphoric acid according to claim 1, is characterized in that: more than one in described dearsenification reactor (1), squirt pump (4), recycle pump I (7), plate filter (8), degassing tower (11), recycle pump II (13), finished pot (14), flange and connecting tube adopt 316L or 304 stainless materials to make.
8. the production equipment of a kind of food grade phosphoric acid according to claim 1, is characterized in that: described packing layer (10) adopts the one in plastics Raschig ring, stainless steel Raschig ring and ceramic raschig rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210579867.8A CN103011106B (en) | 2012-12-27 | 2012-12-27 | Production device of food-grade phosphoric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210579867.8A CN103011106B (en) | 2012-12-27 | 2012-12-27 | Production device of food-grade phosphoric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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| CN105271150B (en) * | 2015-10-22 | 2017-10-27 | 昆明理工大学 | A kind of method of industrial phosphoric acid arsenic removal |
| CN114455558A (en) * | 2022-03-21 | 2022-05-10 | 东华工程科技股份有限公司 | Arsenic-containing phosphoric acid deep arsenic removal system |
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| CN101857212B (en) * | 2010-06-04 | 2012-05-09 | 广西钦州桂金诺磷化工有限公司 | Method for preparing food-grade monoammonium phosphate from wet-process phosphoric acid |
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