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Separation method of composition containing 4-aminodiamine and its equipment

A technology of aminodiphenylamine and separation method, which is applied in the field of composition separation method and its equipment, can solve the problems of decreased recovery rate of composite alkali catalyst, difficult control of water phase evaporation time, low decomposition rate of heat-sensitive substances, etc., and achieve continuous Good separation effect, continuous and effective separation, short cycle effect

Active Publication Date: 2004-02-18
JIANGSU SINORGCHEM TECH CO LTD
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AI Technical Summary

Problems solved by technology

This equipment is used to heat and concentrate the composite alkali catalyst containing tetraalkylammonium hydroxide. The heating is not sufficient, and the evaporation time of the water phase is not easy to control. If the heating temperature is too low, the concentrated concentration will not meet the requirements. If the temperature is too high, it will cause thermal decomposition, and the recovery rate of the composite alkali catalyst containing tetraalkylammonium hydroxide will decrease, and the consumption cost of the composite alkali catalyst containing tetraalkylammonium hydroxide in the production cost will increase. How to continuously and rapidly concentrate the aqueous phase of the compound alkali catalyst heat-sensitive substance containing tetraalkylammonium hydroxide, not only to ensure the concentrated concentration, but also to maintain the low decomposition rate of the heat-sensitive substance containing tetraalkylammonium hydroxide compound alkali catalyst

Method used

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  • Separation method of composition containing 4-aminodiamine and its equipment
  • Separation method of composition containing 4-aminodiamine and its equipment
  • Separation method of composition containing 4-aminodiamine and its equipment

Examples

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Effect test

Embodiment 1

[0029] Composition (wherein the hydrogenation solvent is methyl alcohol) is transported into the top and the bottom of the tower of the extraction tower with the flow rate of 580 liters / hour and the water of the same flow rate with a metering pump, and the auxiliary extractant is selected polypropylene glycol ether for use at a rate of 6 liters / hour The flow rate continuously enters the extraction tower. The extraction tower is a packed tower under normal pressure, and the temperature is 30-50°C. The extracted water phase and organic phase enter the water phase storage tank and the organic phase storage tank respectively, and the obtained water phase flow rate is 767 liters / hour, and the flow rate of the organic phase is 393 liters / hour. A small amount of organic phase can be taken and washed fully with equal volume deionized water. The extraction rate of the organic phase is 97.1%

[0030]Preheat the 767 liters / hour water phase to 80°C and enter the top of the normal pressure...

Embodiment 2

[0034] The present invention adopts a two-effect gas-assisted flow falling film evaporator, and each effect gas-assisted flow falling film evaporator includes a shell side 9, a tube side 10, a steam inlet 13 installed at the upper end of the shell side 9, and a steam inlet 13 installed at the lower end of the shell side 9. Condensed water outlet 14, low-concentration water phase inlet 11 installed at the top of the tube pass 10, high-concentration water phase outlet 15 installed at the bottom of the tube pass 10, five steam inlets 12 evenly installed on the top of the tube pass 10, that is, flow aid mouth, the distribution plate 16 is installed below the low-concentration aqueous phase inlet 11.

[0035] In the two-effect gas-assisted falling film evaporator adopted in the present invention, its shell side 9 is heated by steam, the water phase goes through the tube side 10, and there is also one way of steam from the steam port 12 on the top of the first-effect falling film eva...

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Abstract

A process for separating the components from each other contained in a composition which contains 4-aminodiphenylamine, phenylamine and composite alkali catalyst containing tetraalkylamine hydroxide includes sequentially extracting with water as extractant and polyether as coextractant, concentrating, and evaporating. Its equipment features its gas aided flow type falling-film evaporator. Its advantages are high separation efficiency, high recovery rate 99.7%, and no environmental pollution.

Description

technical field [0001] The invention relates to a separation method and equipment for a composition, in particular to a separation method and equipment for a composition mainly containing 4-aminodiphenylamine. Background technique [0002] In the process of producing 4-aminodiphenylamine with nitrobenzene and aniline as raw materials, the composition after hydrogenation contains 4-aminodiphenylamine, a composite alkali catalyst containing tetraalkylammonium hydroxide, aniline, a hydrogenation solvent, and the like. At present, the composition is generally extracted with batch water, and the composition is separated by the method of concentrating the aqueous solution of tetraalkylammonium hydroxide in batch kettle type and batch distillation. The disadvantages of these methods are that the operation is discontinuous, the procedure is complicated, the amount of water used for extraction is relatively large, the extraction rate is relatively low, the extraction and concentratio...

Claims

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Application Information

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IPC IPC(8): C07C209/86C07C211/55
Inventor 茅晓晖
Owner JIANGSU SINORGCHEM TECH CO LTD
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