Preparation method of vehicle urea
A technology for urea and urea for vehicles is applied in separation methods, preparation of urea derivatives, chemical instruments and methods, etc., which can solve the problems of complicated and complicated preparation processes and high production costs, reduce environmental pollution, high yield and save production. cost effect
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[0035] Example 1:
[0036] A method for preparing urea for vehicles, such as Figure 1~3 As shown, including the following steps,
[0037] S1: Synthesize ammonia and carbon dioxide to obtain molten urea with a mass concentration of 80% and a diuretic mass percentage of less than or equal to 0.25%;
[0038] S2: Pass the desalinated water through the purified water equipment to obtain purified water with a resistivity of 18-20MΩ·cm;
[0039] S3: The molten urea in S1 and the refined water in S2 are added into the batching tank at the same time in a ratio of 1:1.5, and stirred for more than 30 minutes to obtain a urea solution with a mass concentration of 31.5% to 32%;
[0040] S4: By fine-tuning the amount of molten urea or refined water, a urea solution with a mass concentration of 32.5% is obtained, and the urea solution with this mass concentration is crude urea;
[0041] S5: filtering the crude urea to obtain vehicle urea;
[0042] S6: The urea for vehicles is transported to the finish...
Example Embodiment
[0043] Specific embodiments: S1: Use the intermediate product molten urea of the urea production plant as the raw material to prepare molten urea, the specific steps of preparing molten urea, S11: send the raw material ammonia and carbon dioxide into the urea synthesis tower at a ratio of 4:1, and React at 20MPa and 180°C to obtain a reaction liquid;
[0044] S12: The reaction solution contains urea, methylamine, and excess ammonia. The methylamine in the reaction solution undergoes gas stripping decomposition and recovery, and the ammonia is recycled through the recovery device. Finally, the reaction solution undergoes vacuum pre-concentration and one-stage evaporation separation to obtain mass concentration The molten urea is 80%, 130℃, and the mass percentage of diuretic urea is equal to 0.25%; the molten urea is placed in the urea solution tank, and the urea solution tank is connected with a urea solution pump, and the molten urea is delivered to the batching tank through th...
Example Embodiment
[0053] Example 2:
[0054] Specific embodiments: S1: Use the intermediate product molten urea of the urea production plant as the raw material to prepare molten urea, the specific steps of preparing molten urea, S11: send the raw material ammonia and carbon dioxide into the urea synthesis tower at a ratio of 4:1, and React at 20MPa and 200°C to obtain a reaction liquid;
[0055] S12: The reaction solution contains urea, methylamine, and excess ammonia. The methylamine in the reaction solution undergoes gas stripping decomposition and recovery, and the ammonia is recycled through the recovery device. Finally, the reaction solution undergoes vacuum pre-concentration and one-stage evaporation separation to obtain mass concentration The molten urea is 80%, 130℃, and the mass percentage of diuretic urea is equal to 0.25%; the molten urea is placed in the urea solution tank, and the urea solution tank is connected with a urea solution pump, and the molten urea is delivered to the batch...
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