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Process for producing trimellitic anhydride by continuous oxidizing process

A technology of trimellitic anhydride and oxidation process, which is applied in the field of producing trimellitic anhydride by adopting a continuous air liquid-phase oxidation process, can solve the problems of short service life of equipment, small production scale, unstable quality and the like, and achieves high production safety, high production efficiency, The effect of stable product quality

Inactive Publication Date: 2003-12-17
JIANGSU ZHENGDAN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above problems, and to provide a continuous air liquid phase oxidation method that can solve the problems of small production scale, unstable quality, low product yield, high energy consumption, and short service life of equipment in the existing production technology. Process for producing trimellitic anhydride

Method used

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  • Process for producing trimellitic anhydride by continuous oxidizing process
  • Process for producing trimellitic anhydride by continuous oxidizing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Accurately measure 2000Kg of the partial trimethylbenzene raw material in the above technical scheme, accurately measure 8000Kg of acetic acid solvent, join in the batching kettle 4 with delivery pump, then add cobalt acetate, manganese acetate, tetrabromoethane or hydrogen bromide 6Kg each, stir evenly, keep the temperature at 80°C, pass the reaction feed pump at 2m 3 The flow rate of / h is added to the oxidation reactor 5. When the reactor shows 30% liquid level, stop adding, then feed compressed air to boost the pressure to 1.0Mpa, turn on the heat conduction oil and heat it to 150°C to initiate the reaction. When the reaction tail oxygen When the meter shows that the oxygen content in the vented tail gas moves up from zero, turn on the reaction feed pump, with a rate of 2m 3 The flow rate of / h is continuously fed into the reactor 5, and the feed rate of the compressed air is adjusted to control the oxygen content in the reaction exhaust tail gas at ab...

Embodiment 2

[0036] Embodiment 2: Accurately measure 3000Kg and 18000Kg of acetic acid solvent in the above-mentioned technical scheme, add in the batching kettle 4 with a delivery pump, then add cobalt acetate, manganese acetate, tetrabromoethane or hydrogen bromide 21Kg each, stir evenly, keep the temperature at 95°C, pass the reaction feed pump at 2m 3 The flow rate of / h is added to the oxidation reactor 5, and when the reactor shows 25% liquid level, stop adding, then feed compressed air to boost the pressure to 2.0Mpa, turn on the heat conduction oil and heat to 200°C to initiate the reaction, when the reaction tail oxygen When the meter shows that the oxygen content in the vented tail gas moves up from zero, turn on the reaction feed pump, with a rate of 2m 3 The flow rate of / h is continuously fed into the reactor 5, and the feed rate of the compressed air is adjusted to control the oxygen content in the reaction exhaust tail gas at about 6% (volume percentage), and make it reach a...

Embodiment 3

[0038] Embodiment 3: Accurately measure 5000Kg of the partial trimethylbenzene raw material in the above technical scheme, accurately measure 45000Kg of acetic acid solvent, join in the batching kettle 4 with delivery pump, then add cobalt acetate, manganese acetate, tetrabromoethane or hydrogen bromide 100Kg each, stir evenly, keep the temperature at 60°C, pass the reaction feed pump at 2m 3 The flow rate of / h is added to the oxidation reactor 5, stop adding when the reactor shows 20% liquid level, then feed compressed air to boost the pressure to 3.5Mpa, open the heat conduction oil and heat to 280°C to initiate the reaction, when the reaction tail oxygen When the meter shows that the oxygen content in the vented tail gas moves up from zero, turn on the reaction feed pump, with a rate of 2m 3 The flow rate of / h is continuously fed into the reactor 5, and the feed rate of the compressed air is adjusted to control the oxygen content in the reaction exhaust tail gas at about ...

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Abstract

The invention relates to a method for producing trimellitic anhydride by a continuous oxidation process, which uses trimellitic acid as a raw material, acetic acid as a solvent, and cobalt acetate, manganese acetate, tetrabromoethane or hydrogen bromide as a catalyst. The production process includes the following process: (1) continuous oxidation reaction process of the above mixed material; (2) anhydride forming process; (3) refining process; (4) slicing or granulating process; (5) solvent recovery process. Its advantage is that it adopts continuous oxidation technology and advanced refining technology, so that the yield of the product can reach 120%. Compared with the batch oxidation process, this process has the characteristics of high production safety, complete oxidation reaction, stable product quality, low consumption of raw and auxiliary materials, long service life of equipment, and is suitable for large-scale industrial production. In the production technology, the production scale is small, the product quality fluctuates greatly, the product yield is low, the energy consumption is high, and the service life of the equipment is short. Therefore, the process of the present invention has good promotion value.

Description

technical field [0001] The invention relates to a method for producing trimellitic anhydride, in particular to a method for producing trimellitic anhydride by a continuous air liquid-phase oxidation process. Background technique [0002] Trimellitic anhydride can be used in the production of PVC plasticizer trioctyl trimellitate, and can also be used in the manufacture of polyimide resins, water-soluble alkyd resin coatings, water-soluble polyurethane resins, epoxy resin curing agents and advanced aviation lubricants, Power container impregnation oil, pellet binder, smoke suppressant, etc. [0003] At present, the production method of this product in China is produced by the batch oxidation process, that is, in the acetic acid solvent, cobalt acetate, manganese acetate, tetrabromoethane or hydrogen bromide are used as catalysts, and compressed air is used for oxidation reaction. , when the oxygen content in the reaction tail gas reaches more than 19%, stop passing the air. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/89
Inventor 曹正国姚科屏
Owner JIANGSU ZHENGDAN CHEM IND CO LTD
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