Method and equipment for preparation of methyl carbamate

A technology of methyl carbamate and equipment, which is applied in the field of preparing methyl carbamate, can solve problems such as equipment corrosion, achieve the effects of reducing carbon emissions, improving single-pass conversion rate, and being beneficial to environmental protection

Active Publication Date: 2013-08-21
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology allows for better ways to make certain chemical compounds that are important products like MCA (methylenebiscarboxymidocyanic acid). It eliminates the use of expensive or harmful substances such as metal salts during manufacturing processes while still producing these valuable ones efficiently at an affordable price. By utilizing this technique instead of traditional methods involving multiple steps, it saves money on labor compared to current techniques. Additionally, there're no residue left after each step, making them more environmentally friendly than previous alternatives.

Problems solved by technology

Technologies described involve different ways to make certain chemical compounds like methacrylic acid. These techniques include traditional methods that use strong bases with metal salt complexes, but they have limitations due to factors including environmental concerns caused by heavy metallics and other impurities present during manufacturing processes. There has been an increasing interest towards developing new technologies without these drawbacks.

Method used

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  • Method and equipment for preparation of methyl carbamate
  • Method and equipment for preparation of methyl carbamate
  • Method and equipment for preparation of methyl carbamate

Examples

Experimental program
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Effect test

Embodiment 1

[0043] exist figure 1 In the equipment shown, add 120g of urea and 560ml of methanol into the 1L reactor 1 (the molar ratio of feeding is about 1:7), close all the valves, and stir to dissolve. Heat urea and methanol to 160°C, correspondingly, the pressure inside the reactor 1 will gradually rise to about 1.7MPa, and react under this condition for 3 hours. Then open the valves 10, 12, and then open the valve 3. At this time, the ammonia gas is exported to the ammonia recovery device 11 through the condensing device 9, and the pressure and temperature in the reactor 1 tend to decline. After exporting the ammonia gas, close the valves 10 and 12, open the valve 8, gradually raise the temperature in the reactor 1 to about 100°C, and recover the unreacted methanol to the methanol recovery device 7. The reaction product in the reaction kettle 1 was discharged to another vacuum distillation kettle while it was hot, and 88.5 g of methyl carbamate was obtained after vacuum distillatio...

Embodiment 2

[0045] exist figure 1 In the equipment shown, add 120g of urea and 560ml of methanol into the 1L reactor 1 (the molar ratio of feeding is about 1:7), close all the valves, and stir to dissolve. Heat the urea and methanol to 160°C, correspondingly the pressure inside the reactor 1 will gradually increase to about 1.7MPa, and react under this condition for 3 hours. Then open the valves 10, 12, and then open the valve 3. At this time, the ammonia gas is exported to the ammonia recovery device 11 through the condensing device 9, and the pressure and temperature in the reactor 1 tend to decline. When the temperature drops to 60°C, close the valve 3 and continue heating until the temperature and pressure return to the original level, and react for 3 hours. Repeat this operation to export ammonia gas three times (about 1 hour each time). After exporting the ammonia gas for the last time, close the valves 10 and 12, open the valve 8, heat the temperature of the reactor 1 to about 10...

Embodiment 3

[0047] exist figure 1 In the equipment shown, add 120g of urea and 560ml of methanol into the 1L reactor 1 (the molar ratio of feeding is about 1:7), close all the valves, and stir to dissolve. Heat urea and methanol to 160°C, correspondingly, the pressure inside the reactor 1 will gradually rise to about 1.7MPa, and react under this condition for 3 hours. Then open the valves 10, 12, and then open the valve 3. At this time, the ammonia gas is exported to the ammonia recovery device 11 through the condensing device 9, and the pressure and temperature in the reactor 1 tend to decline. When the temperature drops to 60°C, close the valve 3 and continue heating until the temperature and pressure return to the original level, and react for 3 hours. Repeated operations in this way, ammonia gas is exported six times (each time takes about 1h). After exporting the ammonia gas for the last time, close the valves 10 and 12, open the valve 8, heat the temperature of the reactor 1 to ab...

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Abstract

The invention relates to a method for preparation of methyl carbamate. The method comprises the steps of: reacting urea with methanol in a reaction kettle to generate a reaction product containing methyl carbamate and ammonia; leading the ammonia out of the reaction kettle in batches, and at the same time, inputting the exported ammonia into a urea synthesis device as a raw material to react with carbon dioxide, thus generating urea again. Specifically, the charging mole ratio of urea to methanol in the reaction kettle is 1:6-10, the reaction in the reaction kettle occurs at 150-200DEG C, and the corresponding pressure in the reaction kettle is 1.5-2.0MPa. The method is characterized in that the methyl carbamate is prepared by taking urea and methanol as raw materials under intermediate temperature and pressure without catalyst, the rate of conversion from urea to methyl carbamate is improved, the production cost is reduced, and by means of the reaction converting the exported ammonia into urea, the greenhouse gas carbon dioxide is consumed, thus being beneficial to environmental protection. The invention also provides equipment for preparing methyl carbamate.

Description

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Claims

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Application Information

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Owner ZHONGBEI UNIV
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