CN109422657B - Method for separating methylamine mixed gas and co-producing formamide compound - Google Patents
Method for separating methylamine mixed gas and co-producing formamide compound Download PDFInfo
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Abstract
The invention relates to a method for separating methylamine mixed gas and CO-producing formamide compounds, which is a method for obtaining high-purity trimethylamine and CO-producing formamide and N, N-dimethylformamide by carbonylation and conversion amidation reactions of methylamine mixed gas, particularly monomethylamine and dimethylamine in monomethylamine and dimethylamine ratio high methylamine mixed gas and CO, and separation and conversion. The mixed gas of CO gas and methylamine is used as reactant in Ru/CeO2Under the action of the catalyst, methylamine is selectively carbonylated with CO to generate formamide, and then formamide and dimethylamine are transacylated to generate N, N-dimethylformamide, so that the aim of purifying trimethylamine is fulfilled, and two formamide compounds are CO-produced. The used catalyst can be reused after being roasted and reduced. The method has simple operation and low cost, can be used for separating methylamine mixed gas on a large scale, and co-produces formyl compounds with high yield.
Description
Technical Field
The invention relates to a method for separating methylamine mixed gas, in particular to a method for obtaining high-purity trimethylamine after reaction, separation and conversion of monomethylamine, dimethylamine and CO in methylamine mixed gas, namely a method for separating methylamine mixed gas and CO-producing formamide compounds.
Background
The methylamine mixed gas is a generic name of a Mixture of Monomethylamine (MMA), Dimethylamine (DMA) and Trimethylamine (TMA). The monomethylamine is mainly used for pesticides, medicines, dyes, surfactants, water-gel explosives, fuels, photographic developers, gas purifiers and industrial solvents. Dimethylamine is mainly used in pesticides, medicines, rubber accelerators, fatty tertiary amines, industrial solvents (DMF), Dimethylacetamide (DMA), etc., and organic intermediates. The dosage of trimethylamine as feed additive is smaller at present, but the growing space is large. Methylamine is mainly used as an odor additive for pesticides, choline chloride, natural gas, etc. (the new progress of Yangduqin methylamine technology [ J ]. fine chemical raw materials and intermediates, 2007, (11): 8-10).
Currently, the mixed gas of methylamine is mostly obtained by a methanol ammoniation method. The research on the production process for synthesizing methylamine by a gas phase method by taking methanol and ammonia as raw materials begins in 1958, and after years of development, equilibrium type methylamine catalysts and non-equilibrium type methylamine catalysts and processes are formed. In the research process, the distribution of three components in the methylamine mixed gas can be realized by industrial parameters in the methanol ammoniation process, such as reaction temperature, contact time, proportioning ratio and the like. Therefore, the preparation and separation of three methylamine molecules need to pass through a complicated rectification section. Because of the azeotropic phenomenon among methylamine molecules, the separation process has larger energy consumption. Therefore, a simple and effective method for separating methylamine molecules is developed, and the method has important research value and potential application background.
An important industrial application of dimethylamine, the main component of methylamine mixed gas, is the preparation of N, N-dimethylformamide by carbonylation with CO. The method aims at the characteristics of methylamine mixed gas, selects a reaction way through catalysis, particularly separates trimethylamine gas with weaker reaction activity in the mixed gas with high dimethylamine gas ratio, utilizes carbonylation and transacylation and other reactions to co-produce formamide compounds, and is easy to separate the formamide compounds from unreacted trimethylamine gas because the formamide compounds are gas at normal temperature and normal pressure, and the reaction process is simple, the used catalyst is easy to prepare, has better stability and is suitable for industrial production.
Disclosure of Invention
The invention has the significance of overcoming the complicated separation process of the traditional trimethylamine gas, purifying the trimethylamine from the methylamine mixed gas with high efficiency and co-producing formamide compounds with high yield.
The invention relates to a method for separating methylamine mixed gas, which is realized by the following scheme: a process for preparing high-purity trimethylamine and formamide compounds includes such steps as filling Ru-carried metal oxide catalyst in fixed-bed reactor, introducing mixed methylamine gas and CO gas, carbonylating monomethylamine with CO and transacylating dimethylamine with formamide to obtain trimethylamine.
The gas after reaction is purified trimethylamine gas, the liquid phase is a co-produced formamide compound, a liquid phase product is detected by chromatography, and the solid phase catalyst is recycled through simple roasting and reduction processes.
The Ru-supported metal oxide catalyst is prepared by using MoO as metal oxide3、CuO、Co3O4、Nb2O5、Fe2O3、VO2、CeO2One or more of the above; the Ru metal loading is: 0.5 wt% -10 wt%; the preparation of the Ru-supported metal oxide catalyst adopts an impregnation reduction method or a coprecipitation method. The thickness of a catalyst bed layer filled in the reaction tube is 5 mm-30 mm, and the flow rate of the methylamine mixed gas is as follows: 5 to 33 mL/min-1The flow rate of the CO gas is: 5 to 33 mL/min-1The reaction pressure is 0.5-4 MPa, and the reaction temperature is 150-250 ℃; the thickness of a bed layer filled with a catalyst in the reaction tube is preferably 10 mm-15 mm, and the preferable flow rate of methylamine mixed gas is as follows: 10 to 25 mL/min-1The preferred flow rates of the CO gas are: 10 to 25 mL/min-1The reaction pressure is preferably 1-3 MPa, and the reaction temperature is preferably 150-200 ℃.
The method adopts the mixed gas of CO gas and methylamine as a reactant, under the action of a Ru catalyst, the selective carbonylation reaction of monomethylamine and CO is carried out to generate formamide, and then the transacylation reaction of formamide and dimethylamine is carried out to generate N, N-dimethylformamide, so as to achieve the purpose of purifying trimethylamine and CO-produce two formamide compounds.
The reaction process is as follows: filling a Ru catalyst in a fixed bed reactor, introducing methylamine mixed gas and CO gas, wherein the flow rate of the methylamine mixed gas is as follows: 5 to 33 mL/min-1The flow rate of the CO gas is: 5 to 33 mL/min-1The reaction pressure is 0.5-4 MPa, the reaction temperature is 150-250 ℃, and the CO concentration can be increased to more than 90% from 10-50% in the initial stage of the reaction. Liquid for treating urinary tract infectionThe phase product is mainly formamide compound, and the selectivity of the phase product reaches 99 percent at most. The used catalyst can be reused after being roasted and reduced. The method has the advantages of simple operation, low cost and low energy consumption, can be used for separating methylamine mixed gas on a large scale, and can co-produce formyl compounds with high yield.
Compared with the existing method, the method has the following advantages:
1. the huge energy consumption brought by the traditional methods such as rectification separation and the like is effectively reduced, the equipment is simple, and the method is suitable for large-scale industrial production process;
2. the selectivity of the formamide compound of the co-production product is high and can reach more than 95 percent;
3. the catalyst is simple to prepare, can be operated by the existing chemical unit, has good stability and can be used for long time;
the invention relates to a method for separating and obtaining high-purity trimethylamine after reacting monomethylamine, dimethylamine and CO in methylamine mixed gas through catalytic reaction and separating and converting the monomethylamine and the dimethylamine in the methylamine mixed gas, and simultaneously coproducing formamide compounds, wherein the mechanism for realizing the process is shown in figure 1:
drawings
FIG. 1 is a schematic diagram of a reaction process for obtaining high-purity trimethylamine and co-producing formamide compounds through reaction separation; with Ru/CeO2The above reaction processes are respectively described as follows by taking the catalyst as an example: ru is used as an active site to simultaneously activate monomethylamine, dimethylamine and CO molecules to carry out carbonylation reaction to generate formamide and N, N-dimethylformamide (reactions 1 and 2); carrier CeO2As a reducible oxide, it has a certain acidity or basicity after reduction, and catalyzes the transacylation reaction of formamide and dimethylamine (reaction 3). Compared with monomethylamine and dimethylamine, trimethylamine can not carry out carbonylation reaction and transacylation reaction between N and H because of no existence of N-H, and finally still leaves the reactor as gas, thereby achieving the purpose of separation.
Detailed Description
In order to further explain the present invention in detail, several specific embodiments are given below, but the present invention is not limited to these embodiments.
Example 1
20g of MoO are weighed3The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/MoO3The catalyst of 14-25 meshes is filled into a reaction tube by a forming sieve, a bed layer of 15mm is filled, and the flow rate of the methylamine mixed gas is 10 mL/min under the pressure of 3.0MPa-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and increasing the concentration of trimethylamine to 73%; the overall selectivity of the carboxamides was 90% by chromatography.
Example 2
20g of CuO was weighed out and immersed in 48.6 mmol.L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying at 130 ℃, reducing for 3 hours at 350 ℃ in hydrogen atmosphere to prepare 2 wt% of Ru/CuO, forming and screening 14-25 mesh catalyst to fill a reaction tube, filling a 15mm bed layer, filling the catalyst in the reaction tube, placing the reaction tube in a fixed bed reactor, and under the pressure of 3.0MPa, the flow rate of methylamine mixed gas is 10 mL-min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and increasing the concentration of trimethylamine to 78%; the overall selectivity of the carboxamides was 92% by chromatography.
Example 3
Weighing 20g of Co3O4The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/Co3O4Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. In thatReacting at 200 ℃, sampling every 2h, and increasing the concentration of trimethylamine to 86%; the overall selectivity of the carboxamides was 89% by chromatography.
Example 4
Weighing 20g of Nb2O5The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/Nb2O5Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and increasing the concentration of trimethylamine to 88%; the overall selectivity of the carboxamides was 94% by chromatography.
Example 5
20g of Fe are weighed2O3The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/Fe2O3Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and increasing the concentration of trimethylamine to 70%; the overall selectivity of the carboxamides was 85% by chromatography.
Example 6
Weighing 20g of VO2The solution was immersed in 48.6 mmol. L-1Stirring the solution of the hydrated ruthenium trichloride at room temperature for 20 hours, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% Ru/VO2Filling 14-25 mesh catalyst into a reaction tube by a forming sieve, filling a 15mm bed layer, and filling the catalyst into the reaction tubePlacing the reaction tube in a fixed bed reactor, and under the pressure of 3.0MPa, the flow rate of methylamine mixed gas is 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 79%; the overall selectivity of the carboxamides was 90% by chromatography.
Example 7
20g of CeO were weighed2The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/CeO2Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 90%; the overall selectivity of the carboxamides was 99% by chromatography.
Example 8
Weighing 60g of cerous nitrate hexahydrate, dissolving the cerous nitrate hexahydrate in 60mL of water, adding a certain amount of ruthenium trichloride hydrate, stirring at room temperature until the cerous nitrate hexahydrate and the water are completely and uniformly mixed, dropwise adding ammonia water into the solution, adjusting the pH value to be 10, continuously stirring at room temperature for 4 hours, filtering and separating, drying at 130 ℃, reducing at 350 ℃ for 3 hours in a hydrogen atmosphere to obtain 2 wt% of Ru/CeO2Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 85%; the overall selectivity of the carboxamides was 93% by chromatography.
Example 9
Weighing 60g of cerous nitrate hexahydrate, dissolving the cerous nitrate hexahydrate in 60mL of water, adding a certain amount of ruthenium trichloride hydrate, stirring at room temperature until the cerous nitrate hexahydrate and the water are completely and uniformly mixed, dropwise adding ammonia water into the solution, adjusting the pH value to 11, continuously stirring at room temperature for 4 hours, filtering and separating, drying at 130 ℃, reducing at 350 ℃ for 3 hours in a hydrogen atmosphere to obtain 5 wt% of Ru/CeO2Filling 40-60 mesh catalyst into a reaction tube by a forming sieve, filling a 10mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and controlling the flow rate of methylamine mixed gas to be 5 mL/min under the pressure of 2.0MPa-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 5 mL/min-1. Reacting at 150 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 65%; the overall selectivity of the carboxamides was 95% by chromatography.
Example 10
Weighing 60g of cerous nitrate hexahydrate, dissolving the cerous nitrate hexahydrate in 60mL of water, adding a certain amount of ruthenium trichloride hydrate, stirring at room temperature until the cerous nitrate hexahydrate and the water are completely and uniformly mixed, dropwise adding ammonia water into the solution, adjusting the pH value to 11, continuously stirring at room temperature for 4 hours, filtering and separating, drying at 130 ℃, reducing at 350 ℃ for 3 hours in a hydrogen atmosphere to obtain 5 wt% of Ru/CeO2Filling 40-60 mesh catalyst into a reaction tube by a forming sieve, filling a 10mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and controlling the flow rate of methylamine mixed gas to be 5 mL/min under the pressure of 2.0MPa-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 5 mL/min-1. Reacting at 250 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 85%; the overall selectivity of the carboxamides was 85% by chromatography.
Example 11
Weighing 60g of cerous nitrate hexahydrate, dissolving the cerous nitrate hexahydrate in 60mL of water, adding a certain amount of ruthenium trichloride hydrate, stirring at room temperature until the mixture is completely and uniformly mixed, dropwise adding ammonia water into the solution, adjusting the pH value to 11, continuously stirring at room temperature for 4 hours, filtering, separating, drying at 130 ℃, reducing at 350 ℃ for 3 hours in a hydrogen atmosphere to obtain 5 wt% of the cerium nitrate hexahydrate％Ru/CeO2Filling 40-60 mesh catalyst into a reaction tube by a forming sieve, filling a 20mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 4.0MPa, controlling the flow rate of methylamine mixed gas to be 25 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 25 mL/min-1. Reacting at 200 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 76%; the overall selectivity of the carboxamides was 90% by chromatography.
Example 12
Weighing 60g of cerous nitrate hexahydrate, dissolving the cerous nitrate hexahydrate in 60mL of water, adding a certain amount of ruthenium trichloride hydrate, stirring at room temperature until the cerous nitrate hexahydrate and the water are completely and uniformly mixed, dropwise adding ammonia water into the solution, adjusting the pH value to 11, continuously stirring at room temperature for 4 hours, filtering and separating, drying at 130 ℃, reducing at 350 ℃ for 3 hours in a hydrogen atmosphere to obtain 5 wt% of Ru/CeO2Filling 40-60 mesh catalyst into a reaction tube by a forming sieve, filling a 20mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and controlling the flow rate of methylamine mixed gas to be 15 mL/min under the pressure of 2.0MPa-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:1 (volume ratio), and the flow rate of the raw material CO was 15 mL/min-1. Reacting at 200 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 86%; the overall selectivity of the carboxamides was 92% by chromatography.
Example 13
20g of CeO were weighed2The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/CeO2Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:2:3 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reaction at 200 ℃ with samples taken every 2h, chromatography, of trimethylamineThe concentration increased to 95%; the overall selectivity of the carboxamides was 99% by chromatography.
Example 14
20g of CeO were weighed2The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/CeO2Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:8:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 75%; the overall selectivity of the carboxamides was 99% by chromatography.
Example 15
20g of CeO were weighed2The solution was immersed in 48.6 mmol. L-1Stirring the solution of ruthenium trichloride hydrate for 20 hours at room temperature, drying the solution at 130 ℃, and reducing the solution for 3 hours at 350 ℃ in hydrogen atmosphere to obtain 2 wt% of Ru/CeO2Filling a 14-25 mesh catalyst into a reaction tube by using a forming sieve, filling a 15mm bed layer, filling the catalyst into the reaction tube, placing the reaction tube into a fixed bed reactor, and under the pressure of 3.0MPa, controlling the flow rate of methylamine mixed gas to be 10 mL/min-1Wherein the molar ratio of monomethylamine: dimethylamine: trimethylamine 1:1:1 (volume ratio), and the flow rate of the raw material CO was 10 mL/min-1. Reacting at 200 ℃, sampling every 2h, and carrying out chromatographic analysis to increase the concentration of trimethylamine to 85%; the overall selectivity of the carboxamides was 99% by chromatography.
Claims (5)
1. A method for separating methylamine mixed gas and CO-producing formamide compounds is a method for obtaining trimethylamine and CO-producing formamide compounds after reacting monomethylamine, dimethylamine and CO gas in methylamine mixed gas through catalytic reaction, and separating and converting, and is characterized in that: filling a Ru-loaded metal oxide catalyst into a fixed bed reactor, introducing methylamine mixed gas and CO gas, and performing carbonylation reaction of monomethylamine and CO and transacylation reaction of dimethylamine and formamide serving as a product, thereby achieving the purpose of purifying trimethylamine; the gas after the reaction is purified trimethylamine gas, and the liquid phase is a co-produced formamide compound;
the Ru-supported metal oxide catalyst is prepared by using MoO as metal oxide3、CuO、Co3O4、Nb2O5、Fe2O3、VO2、CeO2One or more than two of them; the Ru metal loading is: 0.5 wt% to 10 wt%.
2. The method of claim 1, wherein:
the preparation of the Ru-supported metal oxide catalyst adopts an impregnation reduction method or a coprecipitation method.
3. The method of claim 1, wherein:
the thickness of a catalyst bed layer filled in the reactor is 5 mm-30 mm, and the flow rate of the methylamine mixed gas is as follows: 5 to 33 mL/min-1The flow rate of the CO gas is: 5 to 33 mL/min-1The reaction pressure is 0.5-4 MPa, and the reaction temperature is 150 DEG CoC ~ 250 oC。
4. A method according to claim 1 or 3, characterized by:
the thickness of a catalyst bed layer filled in the reactor is 10 mm-15 mm, and the flow rate of the methylamine mixed gas is as follows: 10 to 25 mL/min-1The flow rate of the CO gas is: 10 to 25 mL/min-1The reaction pressure is 1-3 MPa, and the reaction temperature is 150oC ~ 200 oC。
5. The method of claim 1, wherein: the methylamine mixed gas comprises monomethylamine, dimethylamine and trimethylamine, and the volume composition of the methylamine mixed gas is x: y: z, wherein x, y and z are integers, and 0< x, y, z <100, and x + y + z = 100.
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| CN104447680A (en) * | 2013-09-12 | 2015-03-25 | 中国科学院大连化学物理研究所 | Preparation method of methanamide |
| CN104710321A (en) * | 2013-12-12 | 2015-06-17 | 中国科学院大连化学物理研究所 | Method for preparing N, N-dimethylformamide through dimethylamine carbonylation |
| CN105016937A (en) * | 2014-04-29 | 2015-11-04 | 中国科学院大连化学物理研究所 | Method for preparing formamide by catalytic oxidation of tertiary amine |
| CN106278930A (en) * | 2015-05-13 | 2017-01-04 | 中国科学院大连化学物理研究所 | A kind of dimethylaminocarbonyl prepares the method for N,N-dimethylformamide |
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