CN107051204A - A kind of preparation technology of urea for vehicle solution - Google Patents
A kind of preparation technology of urea for vehicle solution Download PDFInfo
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- CN107051204A CN107051204A CN201710322697.8A CN201710322697A CN107051204A CN 107051204 A CN107051204 A CN 107051204A CN 201710322697 A CN201710322697 A CN 201710322697A CN 107051204 A CN107051204 A CN 107051204A
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- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Catalysts (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of preparation technology of urea for vehicle solution, and step includes：（1）Weigh raw material；（2）Running water is freezed into bulk, then moisture is thrown away by centrifuge, the moisture thrown away is high purity water；（3）Obtained high purity water in step (2) is added in raw material urea and is stirred and heated to 50~70 DEG C, urea liquid is obtained, adds activated carbon and adsorbed, then refilter and obtain purer urea liquid；（4）The purer urea liquid that step (3) is obtained carries out ion exchange, obtains pure urea liquid；（5）Above-mentioned pure urea liquid is well mixed with dimethicone, glycerine again, you can obtain urea for vehicle solution.The present invention uses modified coal mass active carbon, can effectively adsorb biuret, metal ion and the insoluble matter etc. in urea for vehicle solution, and adsorption efficiency is high, improves the quality of urea for vehicle solution.
Description
Technical field
The present invention relates to Vehicular exhaust processing auxiliary agent field, espespecially a kind of preparation technology of urea for vehicle solution.
Background technology
Air quality constantly declines in recent years, and haze is increasingly serious, and motor-vehicle tail-gas is arranged in the reason for causing haze weather
It is laid flat and is intended to account for 20% to 25% or so.Automobile (especially diesel vehicle) exhaust emissions turn into the main source of atmospheric pollution it
One, nitrogen oxides (NOx) is the Main Ingredients and Appearance of vehicle exhaust.NOx needs exhaust gas processing device to control, such as：Thin nitrogen oxygen
Compound adsorption technology (LNT), SCR technology (SCR), oxidation catalytic converter technology (DOC), waste gas recycling
+ grain catcher technology (EGR+DPF) etc., SCR system is widely used in the vent gas treatment of heavy-duty diesel oil locomotive.
SCR technology is selective catalytic reduction（selective catalytic reduction）, principle is：Pass through
Burn to reduce particulate matter (PM) generation in reinforcing stimulus machine, then using urea liquid to NOXIn SCR catalyst
Carry out catalysis reduction.SCR selective catalytic reduction system operatings include urea liquid supply system, urea liquid injection and control system
3 parts such as system, SCR selective catalysis also original system.Urea liquid is deposited in vehicle-mounted special holding vessel, with pump that urea is molten
Liquid sprays the motor exhaust (about 200~500 DEG C, meet reduction reaction conditionses) to heat.At high temperature, urea liquid gasifies
Decompose afterwards and produce NH3, under catalyst action, NH3With the NO in tail gasXReaction, generates harmless H2O and N2。
Chinese patent application 201410488044.3 discloses a kind of preparation method of urea for vehicle, by crystallization urea and height
Pure water is configured, but the preparation of crystallization urea adds the production cost of urea for vehicle solution, reduces urea for vehicle manufacturing enterprise
Profit.And using reverse osmosis unit that the obtained high purity water efficiency of industrial brine is low, quality is not good enough yet, and time-consuming for production, into
This height.
And existing urea for vehicle is all that catalysis makes tail gas meet the standard of state IV, very rare to meet the diesel oil tailstock of state V
Gas discharge standard.
The content of the invention
The present invention is intended to provide a kind of activity it is high, suitable for large-scale production, can continuously non-stop run, yield is big, produce
Efficiency high, the saving energy, can effectively adsorb the preparation technology of the urea for vehicle solution of biuret, metal ion and insoluble matter.
In order to realize above-mentioned task, a kind of concrete technical scheme of the preparation technology of urea for vehicle solution of the invention is as follows.
A kind of preparation technology of urea for vehicle solution, step includes：
（1）Weigh each raw material：Urea granules 20-35 parts by weight, running water 100-120 parts by weight, dimethicone 0.08-0.15
Parts by weight, glycerine 0.01-0.03 parts by weight, activated carbon 30-40 parts by weight；
（2）Running water is freezed into bulk at-20-- 12 DEG C, then moisture is thrown away by centrifuge, the moisture thrown away is
High purity water, the weight of high purity water is the 50-60% of running water；
（3）Obtained high purity water in step (2) is added in raw material urea and stirs 20-30min in the case where rotating speed is 250-300r/min
And be heated to 50~70 DEG C, obtain urea liquid, be cooled to 3-5 DEG C, add activated carbon and adsorbed, then refilter obtain compared with
Pure urea liquid；
（4）It is 6-9m that the purer urea liquid that step (3) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion friendship
Change, obtain pure urea liquid；
（5）Above-mentioned pure urea liquid is well mixed with dimethicone, glycerine again, you can obtain urea for vehicle molten
Liquid.
The weight fraction ratio of dimethicone and glycerine is 8-10：1, preferred weight score ratio is 9：1, by testing
Go out, when the weight fraction ratio of dimethicone and glycerine is 9：1, and dimethicone and glycerine account for gross weight number and be
When 1%, the active highest of urea for vehicle solution.
The weight ratio of the activated carbon weight number urea granules is 1：1-1.5.
Obtained urea for vehicle liquid quality fraction is 32.5%.
The activated carbon is modified coal mass active carbon.
Modified coal mass active carbon processes specific method：Coal mass active carbon is immersed in 30- in hydrogen peroxide solution
50min, then filtering drying, then coal mass active carbon is immersed in 20-60min in sodium dihydrogen phosphate, in 200-350 DEG C of burning
It is dry, obtain modified coal mass active carbon.
The weight fraction of the sodium dihydrogen phosphate is 12-20%.
Advantage of the invention is that：
1st, the mode of refrigerated centrifuge of the present invention prepares high purity water, and preparation efficiency is high, and the purity of high purity water is high, preferable temperature
For -18 DEG C.
2nd, the weight fraction ratio of the pleasantly surprised discovery of inventor, dimethicone and glycerine is 9：1, and dimethyl
Silicone oil and glycerine account for gross weight number for 1% when, the active highest of urea for vehicle solution.
3rd, extraction equipment of the invention is suitable to large-scale production, can continuously non-stop run, yield is big, production efficiency is high simultaneously
Save the energy.
4th, the present invention can effectively adsorb biuret, the metal in urea for vehicle solution using modified coal mass active carbon
Ion and insoluble matter etc., adsorption efficiency are high, improve the quality of urea for vehicle solution.
Embodiment
The present invention is illustrated below by exemplary embodiment.It should be appreciated that the scope of the present invention should not be limited to
The scope of embodiment.Any change or change without departing from present subject matter can be understood by the person skilled in the art.This
The protection domain of invention is determined by scope of the following claims.
First, embodiment
Prepare high purity water：Running water is freezed into bulk at a temperature of-20-- 12 DEG C, then moisture is thrown away by centrifuge,
The moisture thrown away is high purity water, and the weight of high purity water is the 50-60% of running water；
Prepare modified coal mass active carbon：Coal mass active carbon is immersed in 30-50min in hydrogen peroxide solution, then filtering drying,
Coal mass active carbon is immersed in 20-60min in sodium dihydrogen phosphate again, dryouied at 200-350 DEG C, modified ature of coal is obtained and lives
Property charcoal.
Embodiment 1
（1）Weigh each raw material：Urea granules 325g, high purity water 674g, dimethicone 0.9g, glycerine 0.1g, modified coal
Activated carbon 360g；
（2）High purity water is added in raw material urea and stirring 20-30min and is heated to 50~70 in the case where rotating speed is 250-300r/min
DEG C, urea liquid is obtained, 3-5 DEG C is cooled to, modified coal mass active carbon is added and is adsorbed, then refilter and obtain purer
Urea liquid；
（3）It is 6-9m that the purer urea liquid that step (2) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion friendship
Change, obtain pure urea liquid；
（4）Above-mentioned pure urea liquid is well mixed with dimethicone, glycerine again, you can obtain urea for vehicle molten
Liquid.
The urea solution reducing agent produced with the embodiment handles exhaust gas from diesel vehicle, meets ISO 22241-2006《Diesel
engines-NOx reduction agent AUS32》Standard requirement；According to HJ 451-2008《Environmental protection product technology will
Seek emission of diesel engine after-treatment device》Method tested, oxynitrides high conversion rate fully meets state V up to 98%
The requirement of exhaust gas from diesel vehicle discharge standard.
Embodiment 2
（1）Weigh each raw material：Urea granules 325g, high purity water 674g, dimethicone 0.8g, glycerine 0.2g, modified coal
Activated carbon 320g；
（2）High purity water is added in raw material urea and stirring 20-30min and is heated to 50~70 in the case where rotating speed is 250-300r/min
DEG C, urea liquid is obtained, 3-5 DEG C is cooled to, modified coal mass active carbon is added and is adsorbed, then refilter and obtain purer
Urea liquid；
（3）It is 6-9m that the purer urea liquid that step (2) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion friendship
Change, obtain pure urea liquid；
（4）Above-mentioned pure urea liquid is well mixed with dimethicone, glycerine again, you can obtain urea for vehicle molten
Liquid.
The urea solution reducing agent produced with the embodiment handles exhaust gas from diesel vehicle, meets ISO 22241-2006《Diesel
engines-NOx reduction agent AUS32》Standard requirement；According to HJ 451-2008《Environmental protection product technology will
Seek emission of diesel engine after-treatment device》Method tested, oxynitrides high conversion rate meets the diesel oil of state IV up to 96%
The requirement of tail gas discharge standard.
Embodiment 3
（1）Weigh each raw material：Urea granules 325g, high purity water 674g, dimethicone 0.9g, glycerine 0.1g, modified coal
Activated carbon 400g；
（2）High purity water is added in raw material urea and stirring 20-30min and is heated to 50~70 in the case where rotating speed is 250-300r/min
DEG C, urea liquid is obtained, 3-5 DEG C is cooled to, modified coal mass active carbon is added and is adsorbed, then refilter and obtain purer
Urea liquid；
（3）It is 6-9m that the purer urea liquid that step (2) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion friendship
Change, obtain pure urea liquid；
（4）Above-mentioned pure urea liquid is well mixed with dimethicone, glycerine again, you can obtain urea for vehicle molten
Liquid.
The urea solution reducing agent produced with the embodiment handles exhaust gas from diesel vehicle, meets ISO 22241-2006《Diesel
engines-NOx reduction agent AUS32》Standard requirement；According to HJ 451-2008《Environmental protection product technology will
Seek emission of diesel engine after-treatment device》Method tested, oxynitrides high conversion rate fully meets state V up to 97%
The requirement of exhaust gas from diesel vehicle discharge standard.
Embodiment 4
（1）Weigh each raw material：Urea granules 325g, high purity water 674g, dimethicone 0.9g, glycerine 0.1g, common ature of coal
Activated carbon 400g；
（2）High purity water is added in raw material urea and stirring 20-30min and is heated to 50~70 in the case where rotating speed is 250-300r/min
DEG C, urea liquid is obtained, 3-5 DEG C is cooled to, coal mass active carbon is added and is adsorbed, then refilter and obtain purer urea
Solution；
（3）It is 6-9m that the purer urea liquid that step (2) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion friendship
Change, obtain pure urea liquid；
（4）Above-mentioned pure urea liquid is well mixed with dimethicone, glycerine again, you can obtain urea for vehicle molten
Liquid.
The urea solution reducing agent produced with the embodiment handles exhaust gas from diesel vehicle, meets ISO 22241-2006《Diesel
engines-NOx reduction agent AUS32》Standard requirement；According to HJ 451-2008《Environmental protection product technology will
Seek emission of diesel engine after-treatment device》Method tested, oxynitrides high conversion rate meets the diesel oil of state IV up to 94%
The requirement of tail gas discharge standard.
Comparative example 1
（1）Weigh each raw material：Urea granules 325g, high purity water 675g, common coal mass active carbon 400g；
（2）High purity water is added in raw material urea and stirring 20-30min and is heated to 50~70 in the case where rotating speed is 250-300r/min
DEG C, urea liquid is obtained, 3-5 DEG C is cooled to, activated carbon is added and is adsorbed, then refilters that to obtain purer urea molten
Liquid；
（3）It is 6-9m that the purer urea liquid that step (2) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion friendship
Change, obtain pure urea liquid, i.e. urea for vehicle solution.
The urea solution reducing agent produced with the embodiment handles exhaust gas from diesel vehicle, meets ISO 22241-2006《Diesel
engines-NOx reduction agent AUS32》Standard requirement；According to HJ 451-2008《Environmental protection product technology will
Seek emission of diesel engine after-treatment device》Method tested, oxynitrides Transformation efficiency is up to 90 %.
Comparative example 2
（1）Weigh each raw material：Urea granules 325g, high purity water 675g, modified coal mass active carbon 400g；
（2）High purity water is added in raw material urea and stirring 20-30min and is heated to 50~70 in the case where rotating speed is 250-300r/min
DEG C, urea liquid is obtained, 3-5 DEG C is cooled to, modified coal mass active carbon is added and is adsorbed, then refilter and obtain purer
Urea liquid；
（3）It is 6-9m that the purer urea liquid that step (2) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion friendship
Change, obtain pure urea liquid, i.e. urea for vehicle solution.
The urea solution reducing agent produced with the embodiment handles exhaust gas from diesel vehicle, meets ISO 22241-2006《Diesel
engines-NOx reduction agent AUS32》Standard requirement；According to HJ 451-2008《Environmental protection product technology will
Seek emission of diesel engine after-treatment device》Method tested, oxynitrides high conversion rate is up to 91%.
It can be drawn, dimethicone, the ratio of weight and number of glycerine, changed by above example 1-4 and comparative example 1-2
Property coal mass active carbon crucial effect all is produced to the quality of urea for vehicle solution, it is automobile-used when only two conditions must are fulfilled for
The effect of urea liquid processing exhaust gas from diesel vehicle could be best.
The foregoing examples are merely illustrative of the technical concept and features of the invention, its purpose is to allow person skilled in the art
Member can understand present disclosure, and it is not intended to limit the scope of the present invention, all according to spirit of the invention institute
The equivalent change or modification done, should all be included within the scope of the present invention.
Claims (7)
1. a kind of preparation technology of urea for vehicle solution, it is characterised in that：Step includes：
（1）Weigh each raw material：Urea granules 20-35 parts by weight, running water 100-120 parts by weight, dimethicone 0.08-0.15
Parts by weight, glycerine 0.01-0.03 parts by weight, activated carbon 30-40 parts by weight；
（2）Running water is freezed into bulk at-20-- 12 DEG C, then moisture is thrown away by centrifuge, the moisture thrown away is
High purity water, the weight of high purity water is the 50-60% of running water；
（3）Obtained high purity water in step (2) is added in raw material urea and stirs 20-30min in the case where rotating speed is 250-300r/min
And be heated to 50~70 DEG C, obtain urea liquid, be cooled to 3-5 DEG C, add activated carbon and adsorbed, then refilter obtain compared with
Pure urea liquid；
（4）It is 6-9m that the purer urea liquid that step (3) is obtained, which passes through according to flow velocity,3/ h flow velocity carries out ion exchange,
Obtain pure urea liquid；
（5）Above-mentioned pure urea liquid is well mixed with dimethicone, glycerine again, you can obtain urea for vehicle molten
Liquid.
2. the preparation technology of urea for vehicle solution according to claim 1, it is characterised in that：Dimethicone and glycerine
Weight fraction ratio be 8-10：1.
3. the preparation technology of urea for vehicle solution according to claim 1, it is characterised in that：The activated carbon weight number
The weight ratio of urea granules is 1：1-1.5.
4. the preparation technology of urea for vehicle solution according to claim 1, it is characterised in that：Obtained urea for vehicle solution
Mass fraction is 32.5%.
5. the preparation technology of urea for vehicle solution according to claim 1, it is characterised in that：The activated carbon is modified
Coal mass active carbon.
6. the preparation technology of urea for vehicle solution according to claim 5, it is characterised in that：Modified coal mass active carbon adds
Work method is：Coal mass active carbon is immersed in 30-50min in hydrogen peroxide solution, then filtering drying, then coal mass active carbon is soaked
Bubble 20-60min in sodium dihydrogen phosphate, dryouies at 200-350 DEG C, obtains modified coal mass active carbon.
7. the preparation technology of urea for vehicle solution according to claim 6, it is characterised in that：The sodium dihydrogen phosphate
Weight fraction be 12-20%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109939566A (en) * | 2019-04-16 | 2019-06-28 | 灵谷化工集团有限公司 | A kind of low temperature resistant urea for vehicle solution of crystallization-preventive and preparation method thereof |
| CN110575751A (en) * | 2018-06-11 | 2019-12-17 | 河南车权健新能源科技有限公司 | automobile urea reagent and preparation method thereof |
| CN117417273A (en) * | 2023-10-18 | 2024-01-19 | 安徽尚蓝环保科技有限公司 | Preparation method of urea solution for vehicles |
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| CN110575751A (en) * | 2018-06-11 | 2019-12-17 | 河南车权健新能源科技有限公司 | automobile urea reagent and preparation method thereof |
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| CN117417273A (en) * | 2023-10-18 | 2024-01-19 | 安徽尚蓝环保科技有限公司 | Preparation method of urea solution for vehicles |
| CN117417273B (en) * | 2023-10-18 | 2024-04-09 | 安徽尚蓝环保科技有限公司 | Preparation method of urea solution for vehicles |
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