CN110357284A - Preparation method and application of marine urea solution - Google Patents
Preparation method and application of marine urea solution Download PDFInfo
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- CN110357284A CN110357284A CN201910568585.XA CN201910568585A CN110357284A CN 110357284 A CN110357284 A CN 110357284A CN 201910568585 A CN201910568585 A CN 201910568585A CN 110357284 A CN110357284 A CN 110357284A
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- urea
- urea liquid
- raw material
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- pure water
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- 239000004202 carbamide Substances 0.000 title claims abstract description 97
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims abstract description 21
- 239000012535 impurity Substances 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims abstract description 12
- 238000000746 purification Methods 0.000 claims abstract description 11
- 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 claims abstract description 10
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 10
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 239000012047 saturated solution Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 64
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 238000001223 reverse osmosis Methods 0.000 claims description 7
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 229910021645 metal ion Inorganic materials 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 6
- 235000020679 tap water Nutrition 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 5
- 239000010452 phosphate Substances 0.000 claims description 5
- 150000003672 ureas Chemical class 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000012452 mother liquor Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 5
- -1 phosphate anion Chemical class 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
- C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
- C07C273/14—Separation; Purification; Stabilisation; Use of additives
- C07C273/16—Separation; Purification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a preparation method of a marine urea solution, which comprises the following steps: (1) and (3) pure water treatment: processing the water raw material to prepare a pure water raw material; (2) and (3) urea purification: heating a urea saturated solution to 72 ℃, carrying out hydrolysis reaction, cooling to below 28 ℃, separating out crystals, filtering and removing impurities through a fine sand and activated carbon multi-media filter, adding an aldehyde treating agent into the urea solution after impurity removal for reaction, and passing the urea solution after aldehyde removal through an ion exchange resin column to remove most impurities in the urea solution to obtain a urea solution raw material; (3) the method comprises the steps of mixing a pure water raw material and a urea solution raw material to prepare a urea solution with mass fraction concentration of 39% -41%, then adding an aldehyde treating agent with mass fraction concentration of 1.5% to react for 20min after filtering and impurity removal, and then purifying through an ion exchange resin column to obtain the marine urea solution.
Description
Technical field
The present invention relates to technical field of urea production, especially a kind of preparation method and applications of urea liquid peculiar to vessel.
Background technique
With urea peculiar to vessel, alternatively property catalysis reduction SCR is that a kind of High-efficiency diesel engine that can satisfy V discharge standard is useless
Gas post-processing technology, i.e. nitrogen oxides in exhaust gas are reacted at 290 DEG C~420 DEG C of temperature, with reducing agent in catalyst surface,
Nontoxic and pollution-free nitrogen and water are generated, in ship domain in application, reducing agent mostly uses urea liquid and ammonia spirit, but is urinated
Element safety in storage, transport and use is more preferable, is widely used.
However, the purity requirement of urea peculiar to vessel is very high, common urea or urine can not meet urea peculiar to vessel to noble and unsullied
The requirement of cleanliness, certain impurity contents are also far more than urea standard peculiar to vessel in tap water, it is clear that the purification of urea and water process are
The key of urea peculiar to vessel is prepared, the present invention preferably obtains the urea of high-purity using the multiple of configuration solution of agricultural urea, with
Meet relevant Testing index.
Summary of the invention
The case where for the prior art, to prepare reliable, at low cost and impurity few the purpose of the present invention is to provide a kind of
The preparation method and applications of urea liquid peculiar to vessel.
In order to realize above-mentioned technical purpose, the technical solution adopted by the present invention are as follows:
A kind of preparation method of urea liquid peculiar to vessel comprising following steps:
(1) Pure water preparation: after water raw material is passed through multi-medium filtering, then through first-stage reverse osmosis filtering, antisludging equipment and second level
Reverse osmosis semi-transparent diaphragm filtering, is made pure water raw material；
(2) urea purification: being heated to 72 DEG C for agriculture urea saturated solution, bring it about hydrolysis, then will be complete
Urea liquid after hydrolysis is cooled to 28 DEG C again and is precipitated hereinafter, crystallizing urea from aqueous solution again, when oversaturated urea
Crystal is filtered removal of impurities by fine sand, active carbon more medium filter after being precipitated in urea liquid mother liquor, then toward removal of impurities
Aldehydes inorganic agent is added in urea liquid afterwards to be reacted, then will be by except aldehyde, treated that urea liquid passes through ion exchange
Urea liquid raw material is made to remove most of impurity in urea liquid in resin column；
(3) urea liquid raw material made from pure water raw material made from step (1) and step (2) is mixedly configured into quality point
The urea liquid that Particle density is 39%~41% is added the aldehyde that mass fraction concentration is 1.5% and handles then after filtering and impurity removing
20min is reacted in agent, and after then carrying out purification process by ion exchange resin column, urea liquid peculiar to vessel is made.
Further, water raw material described in step (1) is tap water, deionized water or mineral water.
Further, the particle number of pure water raw material obtained is 0.05um or less in step (1).
Further, pure water raw material obtained is at least level-one pure water in step (1).
Further, urea liquid is miscellaneous to remove the major part in urea liquid by ion exchange resin column in step (2)
Matter includes at least metal ion, phosphate anion or chloride ion.
Further, aldehyde inorganic agent described in step (2) and step (3) is hydrogen peroxide.
A kind of urea liquid peculiar to vessel, is made by preparation method described above.
Since the pure water of industrial production urea liquid peculiar to vessel is based on tap water, and in tap water there are a large amount of metal from
Son, these metal ions will lead to SCR catalyst poison deactivation, so should use deionized water when production.The present invention program pushes away
The equipment using two-pass reverse osmosis is recommended, most metal ions, phosphate anion and chloride ion in water removal can be removed.
For the agricultural grade urea used in the present invention for primes or qualified product, the soft water after water process is level-one water rank,
More medium filter is fine sand, the filtering of activated carbon multipole, and used container is the materials such as stainless steel or organic glass.
Using above-mentioned technical solution, compared with prior art, the present invention it has the beneficial effect that
1, the present invention program is used treated that pure water feed particles number can be less than 0.05um hereinafter, rank is pure for level-one
Water；
2, in Pure water preparation, using more medium filter can be good than general single medium filter go it is miscellaneous in water removal
Matter, organic matter, colloid, suspended matter etc.；
3, in Pure water preparation, using semi-transparent diaphragm can quickly and effectively go the various metals such as dechlorination, sodium, potassium, copper, zinc from
Son improves production efficiency, removes the salinity in water removal, further increases water quality；
4, in Pure water preparation, addition antisludging equipment can preferably protect reverse osmosis effect, save water resource and raising turns
Change efficiency, and the service life and maintenance cost of the reverse osmosis semi-permeable membrane of protection；
5, the present invention can make it in the short period using hydrogen peroxide as aldehyde inorganic agent by reacting away aldehydes
Interior content is down to quality that is extremely low, and not influencing urea liquid；
6, whole system of the invention is simple, and capital construction is at low cost apparent advantage.
Specific embodiment
The present invention program is combined with specific embodiments below to be further elaborated:
Embodiment 1
Present embodiment discloses one of embodiments of the present invention program Pure water preparation, wherein uses untreated raw water
(tap water) obtains result such as table (1) institute through testing and analyzing by the collection liquid obtained after fine sand and charcoal filter removal of impurities
Show.
On this basis, organic phosphorus acids anti-incrustation corrosion inhibitor is added, finally by level-one membranous system by filtering and impurity removing
Metal ion treatment is carried out by second level film processing system, obtained collection liquid.Result such as table (2) institute is obtained through testing and analyzing
Show.
The technology of table (1) untreated raw water is analyzed
The technology of table (2) processed collection liquid is analyzed
The above test data is analyzed to show:
1) from table (1) as can be seen that untreated raw water in resistivity, zinc, sodium, potassium, chlorine Testing index cannot
Meet the quality index requirement of electronic grade water GB/T11446.1-2013.
2) as can be seen that the resistivity of processed collection liquid, zinc, sodium, potassium, chlorine, the Testing index of copper are equal from table (2)
It is able to satisfy the quality index requirement of electronic grade water GB/T11446.1-2013, and the indices of collection liquid can reach level-one water
Rank.
3) test more than it can be concluded that, many index of processed collection liquid than untreated raw water have it is apparent under
Drop, and be down to it is extremely low, fully meet urea peculiar to vessel quality index requirement.
Embodiment 2
The present embodiment on the basis of embodiment 1, also discloses the method for urea purification and it is mixed system with embodiment 1
The method for obtaining urea peculiar to vessel, content are as follows:
Urea purification: agriculture urea saturated solution is heated to 72 DEG C, brings it about hydrolysis, then by complete hydrolysis
Urea liquid afterwards is cooled to 28 DEG C again and is precipitated hereinafter, crystallizing urea from aqueous solution again, when oversaturated urea crystal
After being precipitated in urea liquid mother liquor, removal of impurities is filtered by fine sand, active carbon more medium filter, then toward after cleaning
Aldehydes inorganic agent (hydrogen peroxide) is added in urea liquid to be reacted, then will by except aldehyde treated urea liquid by from
Sub-exchange resin column, to remove most of impurity in urea liquid (less including metal ion, phosphate anion or chloride ion),
Urea liquid raw material is made；
Urea liquid preparation peculiar to vessel: by urea liquid raw material made from pure water raw material made from embodiment 1 and the present embodiment
It is mixedly configured into the urea liquid (it tests and analyzes as shown in table 3) that mass fraction concentration is 39%, then after filtering and impurity removing,
The aldehyde inorganic agent that mass fraction concentration is 1.5% is added and reacts 20min, purification process is then carried out by ion exchange resin column
Afterwards, urea liquid peculiar to vessel is made (it tests and analyzes as shown in table 4).
Embodiment 3
The present embodiment is roughly the same with embodiment 2, the difference is that: by pure water raw material made from embodiment 1 and this
Urea liquid raw material made from embodiment 2 is mixedly configured into the urea liquid that mass fraction concentration is 40.0%, and (it is tested and analyzed
As shown in table 3), then after filtering and impurity removing, the aldehyde inorganic agent that mass fraction concentration is 1.5% is added and reacts 20min, then leads to
After crossing ion exchange resin column progress purification process, urea liquid peculiar to vessel is made (it tests and analyzes as shown in table 4).
Embodiment 4
The present embodiment is roughly the same with embodiment 2, the difference is that: by pure water raw material made from embodiment 1 and this
Urea liquid raw material made from embodiment 2 is mixedly configured into the urea liquid that mass fraction concentration is 41.0%, and (it is tested and analyzed
As shown in table 3), then after filtering and impurity removing, the aldehyde inorganic agent that mass fraction concentration is 1.5% is added and reacts 20min, then leads to
After crossing ion exchange resin column progress purification process, urea liquid peculiar to vessel is made (it tests and analyzes as shown in table 4).
The technology of table (3) untreated urea liquid is analyzed
| Project | Embodiment 2 | Embodiment 3 | Embodiment 4 | Quality index |
| Urea content (mass fraction)/% | 39.0 | 40.0 | 41.0 | 39-41.0 |
| Density (20 DEG C)/(kg/m3) | 1132 | 1141 | 1150 | 1105-1177 |
| Basicity (mass fraction)/% is not more than | 0.16 | 0.18 | 0.16 | 0.5 |
| Biuret (mass fraction)/% is not more than | 0.96 | 0.92 | 0.98 | 0.8 |
| Aldehydes/(mg/kg) is not more than | 15 | 14 | 14 | 10 |
| Insoluble matter/(mg/kg) is not more than | 13 | 13 | 14 | 20 |
| Phosphate/(mg/kg) is not more than | 1.6 | 1.7 | 1.6 | 0.8 |
The technology of table (4) processed urea liquid is analyzed
The above test data is analyzed to show:
1) from biuret, the aldehydes, phosphatic Testing index that can be seen that in table (3) in untreated urea liquid
It is not able to satisfy the quality index requirement of urea peculiar to vessel.
2) from biuret, the aldehydes, phosphatic Testing index that can be seen that in table (4) in processed urea liquid
It is able to satisfy the quality index requirement of urea peculiar to vessel.
3) test more than it can be concluded that, many index of processed urea liquid has bright than untreated urea liquid
Aobvious decline, and be down to it is extremely low, fully meet urea peculiar to vessel quality index requirement.
The above is the embodiment of the present invention, for the ordinary skill in the art, religion according to the present invention
Lead, without departing from the principles and spirit of the present invention all equivalent changes done according to scope of the present invention patent, repair
Change, replacement and variant, is all covered by the present invention.
Claims (7)
1. a kind of preparation method of urea liquid peculiar to vessel, it is characterised in that: it includes the following steps:
(1) Pure water preparation: after water raw material is passed through multi-medium filtering, then through first-stage reverse osmosis filtering, antisludging equipment and second level reverse osmosis
Semi-transparent diaphragm filtering thoroughly, is made pure water raw material；
(2) urea purification: agriculture urea saturated solution is heated to 72 DEG C, brings it about hydrolysis, then by complete hydrolysis
Urea liquid afterwards is cooled to 28 DEG C again and is precipitated hereinafter, crystallizing urea from aqueous solution again, when oversaturated urea crystal
After being precipitated in urea liquid mother liquor, removal of impurities is filtered by fine sand, active carbon more medium filter, then toward after cleaning
Aldehyde inorganic agent is added in urea liquid to be reacted, then will be by except aldehyde, treated that urea liquid passes through ion exchange resin
Urea liquid raw material is made to remove most of impurity in urea liquid in column；
(3) that pure water raw material made from step (1) is mixedly configured into mass fraction with urea liquid raw material made from step (2) is dense
The urea liquid that degree is 39%~41% is added the aldehyde inorganic agent that mass fraction concentration is 1.5% and reacts then after filtering and impurity removing
Urea liquid peculiar to vessel is made after then carrying out purification process by ion exchange resin column in 20 min.
2. a kind of preparation method of urea liquid peculiar to vessel according to claim 1, it is characterised in that: institute in step (1)
The water raw material stated is tap water, deionized water or mineral water.
3. a kind of preparation method of urea liquid peculiar to vessel according to claim 1, it is characterised in that: be made in step (1)
Pure water raw material particle number be 0.05 um or less.
4. a kind of preparation method of urea liquid peculiar to vessel according to claim 1, it is characterised in that: be made in step (1)
Pure water raw material be at least level-one pure water.
5. a kind of preparation method of urea liquid peculiar to vessel according to claim 1, it is characterised in that: urea in step (2)
Solution by ion exchange resin column, with remove most of impurity in urea liquid including at least metal ion, phosphate radical from
Son or chloride ion.
6. a kind of preparation method of urea liquid peculiar to vessel according to claim 1, it is characterised in that: step (2) and step
(3) the aldehyde inorganic agent described in is hydrogen peroxide.
7. a kind of urea liquid peculiar to vessel, it is characterised in that: its preparation method as described in one of claim 1 to 6 is made.
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