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Method for separating sec-butylamine

A separation method, sec-butylamine technology, applied in chemical instruments and methods, purification/separation of amino compounds, preparation of organic compounds, etc., can solve problems such as large energy consumption, increased product production costs, unqualified product quality, etc., to achieve Low raw material consumption, low production cost, good product quality

Active Publication Date: 2012-09-05
ZHEJIANG XINHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, different chemical substances have different separation methods due to their own physical properties. If the separation method is improper, on the one hand, it will cause unqualified product quality, on the other hand, it will increase the production cost of the product and consume a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mixture A enters the separation system that tower diameter is 100 with the flow rate of about 50 kilograms / hour, and the weight composition of each component in this mixture is as follows: sec-butanol 4.38%, sec-butylamine 65.77%, water 26.80%, di-sec-butylamine 3.05%. The mixture A is carried out to the middle part of the sec-butylamine separation tower, and the sec-butylamine separation tower is a packed tower with 105 trays in total. Among them, there are 59 rectification sections, the pressure at the top of the tower is 0.01MPa, the temperature at the top of the tower is 66°C, the temperature at the bottom of the tower is 91°C, and the reflux ratio of the top reflux liquid is 7. The output material flow rate at the top of the sec-butylamine separation tower is 32.75 kg / hour, wherein the mass content of sec-butylamine is 99.77%, and water is 0.15%; the output material flow rate at the bottom of the sec-butylamine separation tower is 17.25 kg / hour, wherein The mass c...

Embodiment 2

[0016] According to the conditions and steps of Example 1, only the pressure at the top of the sec-butylamine separation tower was changed to 0.05 MPa, the temperature at the top of the tower was 74.5° C., the temperature at the bottom of the tower was 100° C., and the reflux ratio of the top reflux liquid was 7. The output material flow rate at the top of the sec-butylamine separation tower is 32.80 kg / hour, wherein the mass content of sec-butylamine is 99.75%, and water is 0.15%; the output material flow rate at the bottom of the sec-butylamine separation tower is 17.20 kg / hour, wherein The mass content of sec-butylamine is 0.97%.

Embodiment 3

[0018] According to the conditions and steps of Example 1, only the pressure at the top of the sec-butylamine separation tower was changed to 0.15 MPa, the temperature at the top of the tower was 92° C., the temperature at the bottom of the tower was 114° C., and the reflux ratio of the top reflux liquid was 7. The output material flow rate at the top of the sec-butylamine separation tower is 32.72 kg / hour, wherein the mass content of sec-butylamine is 99.81%, and water is 0.11%; the output material flow rate at the bottom of the sec-butylamine separation tower is 17.28 kg / hour, of which The mass content of sec-butylamine is 1.31%.

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PUM

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Abstract

The invention discloses a method for continuously separating sec-butylamine, comprising the following steps: separating a mixture containing sec-butyl alcohol, sec-butylamine, water and di-sec-butylamine in a sec-butylamine separating tower, collecting the sec-butylamine product from the top of the tower, separating oil and water in a mixture containing the water, the sec-butyl alcohol and the di-sec-butylamine in a phase separator from a tower bottom, and then separating an upper oil phase in the middle part of an azeotrope tower, collecting the sec-butyl alcohol and a little sec-butylamine from the top of the tower, returning to a synthetic reaction system for recycle, after separating the mixture containing the water and the di-sec-butylamine in the middle of the di-sec-butylamine tower, collecting the water from the top of the tower to be discharged in standard, collecting the qualified di-sec-butylamine products from the tower bottom; getting the lower water phase of the phase separator into the middle of a recycling tower, through separating, collecting a little sec-butyl alcohol from the top of the tower to return to the synthetic reaction system for recycle, and discharging the water from the bottom of the tower in standard. The invention has advantages that the process of separating the sec-butylamine is simple, the consumption of the energy and raw materials is low and the production cost is low.

Description

technical field [0001] The invention relates to a separation method of sec-butylamine. Background technique [0002] Sec-butylamine is an important organic chemical intermediate, which is used as an intermediate in the production of medicines, pesticides and siloxanes. It is also used as a polymerization aid and rubber additive, and can also be used as a fruit preservative. Alias: 2-aminobutane, 2-butylamine, 1-methylpropane, molecular formula: C 4 h 11 N, molecular weight: 83.14. As an important organic chemical intermediate, there are many kinds of sec-butylamine production, such as the butanone oxime described in Chinese patent CN100384812C, which is hydrogenated and reduced to synthesize sec-butylamine under Raney nickel catalysis and ammonia environment; Chinese patent CN100342967C The above-mentioned butanone is ammoniated and hydrogenated to synthesize sec-butylamine under the action of modified nickel catalyst; the sec-butanol described in Chinese patent CN1775736...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/07C07C209/86C07C209/84C07C209/16
Inventor 兰昭洪陈国建叶浩刘训军吴锦平谢自强
Owner ZHEJIANG XINHUA CHEM
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