Trimellitic acid continuous production device through crystallization, centrifugation and anhydride formation

Abstract

The invention discloses a trimellitic acid continuous production device through crystallization, centrifugation and anhydride formation in the field of chemical equipment. The trimellitic acid continuous production device includes a crystallization tower, a separation device and an anhydride formation tower which are arranged vertically, wherein the separation device is arranged between the crystallization tower and the anhydride formation tower, the separation device includes a main shaft, an outer separation cylinder and an inner separation cylinder which are arranged in a liquid collectingchamber horizontally and coaxially, and the inner separation cylinder is fixed to the main shaft; the outer separation cylinder is fixed to the liquid collecting chamber, spiral propeller blades are arranged between the outer separation cylinder and the inner separation cylinder, and the inner separation cylinder is provided with a plurality of material discharge channels which run through the wall of the inner separation cylinder; a crystallization slurry outlet is formed in one side of the bottom of the crystallization tower, the crystallization slurry outlet is connected between the main shaft and the inner separation cylinder, and the other end, away from the slurry channels, of the inner separation cylinder communicates with the liquid collecting chamber; and a crystalline material outlet which is connected to the top of the anhydride formation tower is formed in the end, corresponding to the spiral propeller blades, of the outer separation cylinder. The device is applied to continuous production of trimellitic anhydride, and the purposes of improvement of the product quality and product yield, saving of energy and reduction of consumption are achieved.

Description

technical field [0001] The invention relates to a reactor for producing trimellitic anhydride by a continuous method of trimellitic acid, in particular to a continuous crystallization and centrifugation anhydride forming equipment for trimellitic acid to produce trimellitic anhydride. It belongs to the technical field of chemical production equipment. Background technique [0002] In the prior art, trimellitic anhydride is an important chemical raw material in the organic synthesis industry. It has a unique molecular structure and excellent reactivity, and can produce a variety of chemicals with unique properties, such as the preparation of trimellitic acid esters, which are mainly used for plasticizing Agents, powder coating polyester resins, insulating varnishes, adhesives, etc. [0003] The production of trimellitic anhydride by liquid-phase air oxidation is made of trimellitic anhydride as raw material, acetic acid as solvent, cobalt, manganese soluble salt and bromide ...

AI Technical Summary

Problems solved by technology

If the temperature and pressure are too high, by-products will appear; if the temperature and pressure are too low, the yield of trimellitic anhydride will decrease

[0015] Intermittent crystallization, centrifugation and anhydride forming processes make the equipment run unstable, and the process indicators are difficult to control. For example, the repeated temperature and pressure rise and fall during the crystallization and anhydride forming process will make the equipment prone to fatigue damage and increase the damage to the equipment pipeline. Corrosion, reducing the service life of equipment

At the same time, by-products are prone to occur, and product quality and product yield cannot be improved.

As a result, the entire production process cannot be carried out stably, the production adaptation intensity is not high, the production cannot be greatly improved, and it is not suitable for large-scale production

In addition, the equipment is separated from each other, the large heat dissipation surface and repeated heating are not conducive to energy saving

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