CN108970393A - A kind of urea for vehicle liquid and preparation method thereof - Google Patents
A kind of urea for vehicle liquid and preparation method thereof Download PDFInfo
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- CN108970393A CN108970393A CN201810780756.0A CN201810780756A CN108970393A CN 108970393 A CN108970393 A CN 108970393A CN 201810780756 A CN201810780756 A CN 201810780756A CN 108970393 A CN108970393 A CN 108970393A
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- Prior art keywords
- urea
- liquid
- active carbon
- high purity
- acid
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
-
- 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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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of urea for vehicle liquid and preparation method thereofs, it is immersed in organic acid and is modified after active carbon is smashed and ground, mechanical filter is carried out in second distillation and sterilization to raw water later, dissolve technical grade urea, vacuum filter is carried out using the 5A molecular sieve that pickling is calcined after mechanical admixture, photocatalysis is carried out to urea liquid later and removes aldehyde, it is filtered using modified active carbon, after low temperature crystallization with the high purity water mechanical mixture of preparation, the urea solution of suitable concentration is made in proportion, by the present invention in that being handled with molecular sieve and active carbon urea, more pure urea crystal is obtained by low temperature crystallization later, it is dispersed in high purity water and can be reduced deposit in oil, keep fuel system cleaning, inhibit or reduce the generation of deposit.
Description
Technical field
The invention belongs to removal of nitrogen oxide field, in particular to a kind of urea for vehicle liquid and preparation method thereof.
Background technique
Currently, with the development of science and technology, the dosage of automobile is more more and more universal, in December, 2010, National Environmental is protected
Shield portion requires the heavy-duty diesel oil motor vehicle emission of sale from January 1st, 2012 of automobile factory of China that should reach the discharge mark of state IV
Standard, urea for vehicle are the essential products that heavy-duty diesel vehicle reaches four discharge standard of state.Urea for vehicle refers to that urea concentration is
32.5% and solvent be ultrapure water aqueous solution of urea, raw material be urea crystal and ultrapure water.The diesel vehicles such as heavy truck, car
Reach four discharge standard of state, suitable SCR system will be selected in vent gas treatment, and this system must utilize urea
Solution handles the nitrogen oxides in tail gas.
Summary of the invention
The present invention provides a kind of urea for vehicle liquid and preparation method thereof, by the present invention in that with molecular sieve and active carbon to urea into
Row processing, obtains more pure urea crystal by low temperature crystallization later, is dispersed in high purity water and can be reduced deposit in oil,
Fuel system cleaning is kept, the generation of deposit is inhibited or reduce.
The present invention is achieved by the following technical solutions:
A kind of urea for vehicle liquid and preparation method thereof, which comprises the following steps:
(1) active carbon is handled
A) after being crushed active carbon, granularity is ground into up to 200-300, impregnate 4-8 hours using organic acid；
B) active carbon after immersion is filtered, washs to pH5.5-7, sterilizes 20-30 seconds at 75-80 DEG C, in 110-150
It is 4-8 hours dry at DEG C；
(2) preparation of high purity water
A) raw water is subjected to mechanical filter, goes to carry out single flash and second distillation in water removal after mechanical admixture；
Whether the high purity water for b) detecting second distillation is up to standard, if has impurity to be mixed into, if so, being filtered and sterilizing, if not miscellaneous
Matter is mixed into, for use；
(3) initial urea solution is produced
A) technical grade urea is dissolved in deionized water, is stirred and uniformly obtains urea liquid, carried out mechanical filter, go to remove water
Middle mechanical admixture；
B) 5A molecular sieve is immersed in hydrochloric acid solution after 5-12 hours, is filtered, drying and calcining must activate 5A molecular sieve and answer
Condensation material;
C) after the urea liquid for preparing step a) carries out vacuum filter by the 5A molecular sieve after activation；
D) urea liquid after vacuum filter is subjected to photocatalysis and removes aldehyde, be filtered by step (1) resulting active carbon
To urea liquid；
(4) it prepares
A) step (3) resulting urea liquid is added in low temperature crystallization device, initial temperature is set as 40 DEG C of constant temperature stirrings, control
Cooling rate processed is 0.05-0.40 DEG C/min, and the magma of the urea crystal of crystallization is filtered, crystal and filtrate are obtained;
B) it after being rinsed to urea crystal using high purity water, then dries, later by the resulting high purity water of step (2) and urea
Crystallization is mixed, and aqueous solution of urea is obtained, and the urea solution of suitable concentration is made in proportion.
The organic acid is acetic acid, propionic acid, butyric acid, isobutyric acid, oxalic acid, one or more of in citric acid.
The photocatalysis is, using porous activated carbon as carrier, to load nano silica under ultraviolet lighting except aldehyde, into
Row catalysis reaction 30-60 minutes.
It is 1:(3-4 that the suitable concentration, which is by the ratio of crystallization urea and high purity water), controlled concentration is in 31.5-
33.5%.
The invention has the advantages that
The present invention is immersed in organic acid after smashing and grinding active carbon and is modified, and carries out mechanical filter in two to raw water later
Technical grade urea is dissolved in secondary distillation and sterilization, and the 5A molecular sieve for using pickling to calcine after mechanical admixture carries out vacuum filter, later
To urea liquid carry out photocatalysis remove aldehyde, be filtered using modified active carbon, after low temperature crystallization with the high purity water of preparation
The urea solution of suitable concentration is made in mechanical mixture, proportion.Smashing and grinding destroys the internal microstructure of active carbon with organic acid,
The loaded modified activated carbon supported modification of organic acid, so that active carbon has preferable selectivity to the nitride in urea liquid,
Molecular sieve is subjected to pickling calcining and activating simultaneously, improves the activation efficiency of 5A molecular sieve, and then be added significantly to 5A molecular sieve
Adsorption capacity, absorption property stablizes, and molecular sieve is not easy to be crushed, and reduces energy consumption.The present invention dissolves urea simultaneously,
It is handled by molecular sieve and active carbon, removes aldehyde content in urea, crystal is not accumulated after low temperature crystallization, and heap density is small, later
Be configured to urea liquid with high purity water can be reduced deposit in oil after, keep fuel system cleaning, shape in dispersion fuel
At sediment, so that small particle is kept suspended state, to inhibit or reduce the generation of deposit.By the present invention in that using molecule
Sieve and active carbon handle urea, obtain more pure urea crystal by low temperature crystallization later, are dispersed in high purity water
In can be reduced deposit in oil, keep fuel system cleaning, inhibit or reduce the generation of deposit.
Specific embodiment
A kind of urea for vehicle liquid and preparation method thereof, which comprises the following steps:
(1) active carbon is handled
A) after being crushed active carbon, granularity is ground into up to 200-300, impregnate 5 hours using organic acid；
B) active carbon after immersion is filtered, washing to pH5.5-7 sterilizes 25 seconds at 75-80 DEG C, does at 120 DEG C
Dry 6 hours；
(2) preparation of high purity water
A) raw water is subjected to mechanical filter, goes to carry out single flash and second distillation in water removal after mechanical admixture；
Whether the high purity water for b) detecting second distillation is up to standard, if has impurity to be mixed into, if so, being filtered and sterilizing, if not miscellaneous
Matter is mixed into, for use；
(3) initial urea solution is produced
A) technical grade urea is dissolved in deionized water, is stirred and uniformly obtains urea liquid, carried out mechanical filter, go to remove water
Middle mechanical admixture；
B) 5A molecular sieve is immersed in hydrochloric acid solution after 10 hours, is filtered, that drying and calcining must activate 5A molecular sieve is compound
Material;
C) after the urea liquid for preparing step a) carries out vacuum filter by the 5A molecular sieve after activation；
D) urea liquid after vacuum filter is subjected to photocatalysis and removes aldehyde, be filtered by step (1) resulting active carbon
To urea liquid；
(4) it prepares
A) step (3) resulting urea liquid is added in low temperature crystallization device, initial temperature is set as 40 DEG C of constant temperature stirrings, control
Cooling rate processed is 0.05-0.40 DEG C/min, and the magma of the urea crystal of crystallization is filtered, crystal and filtrate are obtained;
B) it after being rinsed to urea crystal using high purity water, then dries, later by the resulting high purity water of step (2) and urea
Crystallization is mixed, and aqueous solution of urea is obtained, and the urea solution of suitable concentration is made in proportion.
The organic acid is acetic acid, propionic acid, butyric acid, isobutyric acid, oxalic acid, one or more of in citric acid.
The photocatalysis is, using porous activated carbon as carrier, to load nano silica under ultraviolet lighting except aldehyde, into
Row catalysis reaction 40 minutes.
It is 1:(3-4 that the suitable concentration, which is by the ratio of crystallization urea and high purity water), controlled concentration is in 31.5-
33.5%.
Claims (4)
1. a kind of urea for vehicle liquid and preparation method thereof, which comprises the following steps:
(1) active carbon is handled
A) after being crushed active carbon, granularity is ground into up to 200-300, impregnate 4-8 hours using organic acid；
B) active carbon after immersion is filtered, washs to pH5.5-7, sterilizes 20-30 seconds at 75-80 DEG C, in 110-150
It is 4-8 hours dry at DEG C；
(2) preparation of high purity water
A) raw water is subjected to mechanical filter, goes to carry out single flash and second distillation in water removal after mechanical admixture；
Whether the high purity water for b) detecting second distillation is up to standard, if has impurity to be mixed into, if so, being filtered and sterilizing, if not miscellaneous
Matter is mixed into, for use；
(3) initial urea solution is produced
A) technical grade urea is dissolved in deionized water, is stirred and uniformly obtains urea liquid, carried out mechanical filter, go to remove water
Middle mechanical admixture；
B) 5A molecular sieve is immersed in hydrochloric acid solution after 5-12 hours, is filtered, drying and calcining must activate 5A molecular sieve and answer
Condensation material;
C) after the urea liquid for preparing step a) carries out vacuum filter by the 5A molecular sieve after activation；
D) urea liquid after vacuum filter is subjected to photocatalysis and removes aldehyde, be filtered by step (1) resulting active carbon
To urea liquid；
(4) it prepares
A) step (3) resulting urea liquid is added in low temperature crystallization device, initial temperature is set as 40 DEG C of constant temperature stirrings, control
Cooling rate processed is 0.05-0.40 DEG C/min, and the magma of the urea crystal of crystallization is filtered, crystal and filtrate are obtained;
B) it after being rinsed to urea crystal using high purity water, then dries, later by the resulting high purity water of step (2) and urea
Crystallization is mixed, and aqueous solution of urea is obtained, and the urea solution of suitable concentration is made in proportion.
2. a kind of urea for vehicle formula of liquid according to claim 1, which is characterized in that the organic acid is acetic acid, third
It is acid, butyric acid, isobutyric acid, oxalic acid, one or more of in citric acid.
3. a kind of urea for vehicle formula of liquid according to claim 1, which is characterized in that the photocatalysis is in purple except aldehyde
Under outer illumination, using porous activated carbon as carrier, nano silica is loaded, carries out catalysis reaction 30-60 minutes.
4. a kind of urea for vehicle formula of liquid according to claim 1, which is characterized in that the suitable concentration is that will crystallize
The ratio of urea and high purity water is 1:(3-4), controlled concentration is in 31.5-33.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810780756.0A CN108970393A (en) | 2018-07-17 | 2018-07-17 | A kind of urea for vehicle liquid and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810780756.0A CN108970393A (en) | 2018-07-17 | 2018-07-17 | A kind of urea for vehicle liquid and preparation method thereof |
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| CN108970393A true CN108970393A (en) | 2018-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112094207A (en) * | 2020-09-30 | 2020-12-18 | 河南弘康环保科技有限公司 | Preparation method of low-formaldehyde automobile urea solution |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772040A (en) * | 2015-03-19 | 2015-07-15 | 张山 | Vehicle urea liquid formula |
| CN105061265A (en) * | 2015-07-30 | 2015-11-18 | 江门市广耀化工有限公司 | Preparation method of low formaldehyde urea solution used for urea |
| CN105797584A (en) * | 2016-03-29 | 2016-07-27 | 河北鑫达润滑油科技有限公司 | Production method of vehicle-used urea solution |
-
2018
- 2018-07-17 CN CN201810780756.0A patent/CN108970393A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772040A (en) * | 2015-03-19 | 2015-07-15 | 张山 | Vehicle urea liquid formula |
| CN105061265A (en) * | 2015-07-30 | 2015-11-18 | 江门市广耀化工有限公司 | Preparation method of low formaldehyde urea solution used for urea |
| CN105797584A (en) * | 2016-03-29 | 2016-07-27 | 河北鑫达润滑油科技有限公司 | Production method of vehicle-used urea solution |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112094207A (en) * | 2020-09-30 | 2020-12-18 | 河南弘康环保科技有限公司 | Preparation method of low-formaldehyde automobile urea solution |
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Application publication date: 20181211 |