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Production process of urea solution for vehicles

A technology of urea for vehicles and production process, which is applied to the preparation of urea derivatives, the preparation of organic compounds, gas treatment, etc., which can solve the problem of increasing the production cost of urea solution for vehicles, reducing the profits of production enterprises of urea for vehicles, and the inability of urea waste liquid Reuse and other issues to achieve the effects of shortened residence time, wide active temperature range, low alkalinity and aldehydes

Inactive Publication Date: 2020-05-08
安徽德利来环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To meet this standard, SCR technology is generally adopted in the world. Due to the high content of impurities such as biuret, commercially available industrial or agricultural urea granules cannot be directly used to prepare urea solutions for vehicles. The liquid cannot be reused, which reduces the profit of the vehicle urea production enterprises
[0003] Chinese patent application CN102584635 discloses a method for preparing urea for vehicles, which requires repeated crystallization to reduce the content of biuret and other impurities in urea, but a large amount of urea waste liquid will be produced during the multiple crystallization process of urea, which increases the The production cost of urea solution for vehicles reduces the profits of urea manufacturers for vehicles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of production technology of vehicle urea solution, comprises the following steps:

[0022] S1: Cool the raw urine in the raw urine tank to 85°C, and centrifuge the cooled raw urine to remove impurities to obtain pure raw urine;

[0023] S2. Introduce the pure raw urine into the urine cooling crystallizer, keep the temperature in the urine cooling crystallizer at 20°C, and form a urea crystal suspension under the action of the stirrer in the urine cooling crystallizer;

[0024] S3: centrifuging the urea crystal suspension prepared in step S2 to obtain urea crystals and a urea solution containing a small amount of urea;

[0025] S4. Put the urea crystals prepared in step S3 into a low-temperature drying room for drying, the drying temperature is kept at 32° C., and the air flow in the drying room is kept, and the pure urea crystals are obtained by drying;

[0026] S5. Mixing and dissolving the vehicle urea crystals obtained in step S4 with pure water to obtain a v...

Embodiment 2

[0028] A kind of production technology of vehicle urea solution, comprises the following steps:

[0029] S1: Cool the raw urine in the raw urine tank to 84°C, and centrifuge the cooled raw urine to remove impurities to obtain pure raw urine;

[0030] S2. Introduce the pure raw urine into the urine cooling crystallizer, keep the temperature in the urine cooling crystallizer at 30°C, and form a urea crystal suspension under the action of the stirrer in the urine cooling crystallizer;

[0031] S3: centrifuging the urea crystal suspension prepared in step S2 to obtain urea crystals and a urea solution containing a small amount of urea;

[0032] S4. Put the urea crystals prepared in step S3 into a low-temperature drying room for drying, the drying temperature is kept at 35° C., and the air flow in the drying room is kept to dry to obtain pure urea crystals;

[0033] S5. Mixing and dissolving the vehicle urea crystals obtained in step S4 with pure water to obtain a vehicle urea sol...

Embodiment 3

[0035] A kind of production technology of vehicle urea solution, comprises the following steps:

[0036] S1: Cool the raw urine in the raw urine tank to 87°C, and centrifuge the cooled raw urine to obtain pure raw urine;

[0037] S2. Introduce the pure raw urine into the urine cooling crystallizer, keep the temperature in the urine cooling crystallizer at 40°C, and form a urea crystal suspension under the action of the stirrer in the urine cooling crystallizer;

[0038] S3: centrifuging the urea crystal suspension prepared in step S2 to obtain urea crystals and a urea solution containing a small amount of urea;

[0039] S4. Put the urea crystals prepared in step S3 into a low-temperature drying room for drying, the drying temperature is kept at 35° C., and the air flow in the drying room is kept to dry to obtain pure urea crystals;

[0040] S5. Mixing and dissolving the vehicle urea crystals obtained in step S4 with pure water to obtain a vehicle urea solution.

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Abstract

The invention discloses a production process urea solution for vehicles. The production process comprises the following steps: S1, cooling raw urine in a raw urine tank to a temperature of 85-90 DEG C, and carrying out centrifugal impurity removal on the cooled raw urine to obtain pure raw urine; S2, introducing pure raw urine into a urine cooling crystallizer, keeping a temperature in the urinecooling crystallizer at 20-60 DEG C, and allowing urea crystal suspension liquid to be formed under the action of a stirrer in the urine cooling crystallizer; and S3, carrying out centrifugal separation on the urea crystal suspension liquid prepared in the step S2 to obtain urea crystals and a urea solution containing a small amount of urea. According to the invention, urine is used as a raw material; and compared with granular urea, the retention time of urea in the urine in a production system is shortened, and the contents of biuret, metal ions and the like are reduced, so product quality can be improved.

Description

technical field [0001] The invention relates to the field of production technology of urea for vehicles, in particular to a production technology of urea solution for vehicles. Background technique [0002] With the continuous increase of the number of automobiles in our country, NOX and particulate matter emitted from automobiles, especially diesel vehicles, have become the main pollution sources of urban air. To this end, the state has formulated and started to implement the National IV emission standards for automobile exhaust. To meet this standard, SCR technology is generally adopted in the world. Due to the high content of impurities such as biuret, commercially available industrial or agricultural urea granules cannot be directly used to prepare urea solutions for vehicles. The liquid can not be reused, which reduces the profits of the urea manufacturers for vehicles. [0003] Chinese patent application CN102584635 discloses a method for preparing urea for vehicles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56C07C273/02C07C273/16
CPCB01D53/56B01D53/78B01D2258/012C07C273/02C07C273/16
Inventor 杨海波杨海涛
Owner 安徽德利来环保科技有限公司
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