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Regeneration technology of recovered methylamine solution and device thereof

A methylamine, solution technology, used in the chemical industry, sustainable manufacturing/processing, climate sustainability, etc., to achieve the effect of reducing tower height, operating flexibility, and reducing pollution

Active Publication Date: 2013-02-27
TIANJIN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This separation and absorption process overcomes the problem of removing impurities at the middle boiling point of the recovered methylamine solution and the problem of the utilization form of the methylamine solution, and achieves the purpose of regenerating the methylamine solution, which is of great significance for the recovery of methylamine and its industrialization.

Method used

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  • Regeneration technology of recovered methylamine solution and device thereof

Examples

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Effect test

Embodiment 1

[0021] like figure 1 Shown, the 10% methylamine aqueous solution that reclaims contains impurities such as acetone, butanol, tetrahydrofuran, and raw material methylamine solution 1 is in separation tower bottom waste material-raw material heat exchanger 21 after heat exchange with the high-temperature waste material from separation tower tower kettle, reclaims The methylamine solution 2 enters the separation tower 19 from the lower part of the separation tower. Separation tower adopts structured packing tower, and operating pressure is 0.2Mpa, and tower top temperature is 10 ℃, and theoretical plate is 20, and feeding plate is the 10th plate, and reflux ratio is 0.2. A part of the high-temperature waste material 3 in the tower kettle is used as waste material primary heat exchange feed 7, and is input into the waste material-raw material heat exchanger 21 at the bottom of the separation tower to preheat the raw material, and the waste material primary heat exchange discharge ...

Embodiment 2

[0023] like figure 1Shown, the 35% methylamine aqueous solution that reclaims contains the impurity such as dimethylamine, trimethylamine, raw material methylamine solution 1 is in separation tower bottom waste material-raw material heat exchanger 21 after heat exchange with the high-temperature waste material from separation tower still, reclaims The methylamine solution 2 enters the separation tower 19 from the lower part of the separation tower. Separation tower adopts structured packing tower, and operating pressure is 0.5Mpa, and tower top temperature is 40 ℃, and theoretical plate is 50, and feeding plate is the 35th plate, and reflux ratio is 1.5. A part of the high-temperature waste material 3 in the tower kettle is used as waste material primary heat exchange feed 7, and is input into the waste material-raw material heat exchanger 21 at the bottom of the separation tower to preheat the raw material, and the waste material primary heat exchange discharge material 8 pas...

Embodiment 3

[0025] like figure 1 Shown, the 90% methylamine aqueous solution that reclaims contains dimethylamine, trimethylamine, tetrahydrofuran (THF), acetone, impurities such as methyl alcohol, and raw material methylamine solution 1 is in separation tower bottom waste material-raw material heat exchanger 21 and comes from separation tower tower still high temperature After waste heat exchange, the recovered methylamine solution 2 enters the separation tower 19 from the middle and lower part of the separation tower. Separation tower adopts valve tower, and operating pressure is 1Mpa, and tower top temperature is 70 ℃, and theoretical plate is 60, and feeding plate is the 50th plate, and reflux ratio is 2. A part of the high-temperature waste material 3 in the tower kettle is used as waste material primary heat exchange feed 7, and is input into the waste material-raw material heat exchanger 21 at the bottom of the separation tower to preheat the raw material, and the waste material pr...

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Abstract

The invention discloses a regeneration technology of a recovered methylamine solution and a device thereof, belonging to the technical field of chemical separation engineering. The device disclosed herein comprises a separation tower, an absorption tower, a gas-liquid separation pot and a series of matched heat-exchange units. The technology disclosed herein is characterized by carrying out pressurized rectification on a recovered impurity-containing methylamine solution in the separation tower to produce high-purity methylamine gas; absorbing gaseous methylamine by using the absorbent in the absorption tower, removing dimethylamine, trimethylamine and other impurities which have a boiling point that is between the boiling points of methylamine and the solvent from the recovered methylamine solution to ensure the concentration and the purity of the regenerated methylamine solution. According to the invention, the recycling problem of the recovered methylamine solution is overcome, the pollution to environments caused by methylamine exhaust gas can be prevented, the enterprise economic benefit is raised, the elasticity of the technology operations is large, and the technology disclosed herein is very important for recycling the recovered methylamine and the industrialization thereof.

Description

technical field [0001] The invention relates to a regeneration process method and device for recovering methylamine solution, belonging to the technical field of chemical separation engineering. Background technique [0002] Methylamine is a raw material for various solvents, electronic materials and pharmaceuticals. In industry, it is commonly produced by the reaction of ammonia and methanol under the catalysis of aluminosilicate. What is produced in this reaction is a mixture of methylamine, dimethylamine and trimethylamine, and the concentration of dimethylamine and trimethylamine in methylamine is controlled by distillation during purification. Methylamine is generally used as a pressurized anhydrous gas, or in the form of methanol, ethanol, tetrahydrofuran, or an aqueous solution. The regeneration problem after the use of the methylamine of general solution form is difficult to realize, for example 40% methylamine aqueous solution is mixed with a lot of impurities with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/04C07C209/86
CPCY02P20/10
Inventor 隋红宋国全韩祯肖强董文威杨理李永红李鑫钢史荣会
Owner TIANJIN UNIV
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