Process for producing methyl carbamate
A technology of methyl carbamate and process, which is applied in the field of producing methyl carbamate, can solve the problems of high equipment material requirements, high equipment requirements, complicated process flow, etc., and achieve shortened reaction time, energy exchange balance, and material balanced effect
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Embodiment 1
[0010] Example 1: Add urea and methanol into the reaction kettle according to the proportional metering relationship, heat the reaction temperature to 140°C, and when the pressure reaches 1.5Mpa, open the valve connecting the gas phase of the reaction kettle and the rectification tower, and the rectification tower starts to work. 3 The urea-methanol solution with a concentration of 1mol / L is supplemented at a rate of 1 mol / L, and the gas phase release rate from the reactor to the rectification tower is controlled to maintain the balance of the materials in and out of the reactor, and the reaction time is 4 hours. The methyl carbamate yield was 86%. Simultaneously by-product 30% ammonia water.
Embodiment 2
[0011] Example 2: Add urea and methanol into the reactor according to the proportional metering relationship, heat the reaction temperature to 150°C, and when the pressure reaches 1.0Mpa, open the valve connecting the gas phase of the reactor and the rectification tower, and the rectification tower starts to work. 3 The urea-methanol solution with a concentration of 0.5mol / L is supplemented at a rate of 0.5 mol / L to control the gas-phase release rate from the reactor to the rectification tower, so as to maintain the balance of the materials in and out of the reactor, and the reaction time is 3 hours. The methyl carbamate yield was 90%. Simultaneously by-product 30% ammonia water.
Embodiment 3
[0013] Add urea and methanol into the reaction kettle in proportion to the metering relationship, heat the reaction temperature to 150°C, and when the pressure reaches 1.5Mpa, open the valve connecting the gas phase of the reaction kettle and the rectification tower, and the rectification tower starts to work, with 0.2m 3 The urea-methanol solution with a concentration of 1.5 mol / L is supplemented at a rate of 1.5 mol / L, and the gas phase release rate from the reactor to the rectification tower is controlled to maintain the balance of the materials in and out of the reactor, and the reaction time is 4 hours. The methyl carbamate yield was 88%. Simultaneously by-product 30% ammonia water.
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