Methylbenzene oxidation tower in 10000-tone level benzoic acid production

Abstract

The invention relates to a methylbenzene oxidation tower in 10000-tone level benzoic acid production. The oxidation tower has a height of between 8 and 10m, and a diameter of between 4 and 5m, wherein an air inlet, a methylbenzene inlet, a vapor inlet, a vapor outlet, an oxidation liquid outlet and an oxidation cooling liquid incoming oxidation tower port are arranged on the oxidation tower body; the distance from the air inlet to the bottom of the tower is between 6 and 8m, the distance from the vapor inlet to the bottom of the tower is between 4 and 6m, the distance from the vapor outlet to the tower bottom is between 3.5 and 5.5m, the distance from the oxidation liquid inlet to the bottom of the tower is between 0.3 and 0.5m, and the distance from the oxidation cooling liquid incoming oxidation tower port is between 5 and 7m; and the methylbenzene inlet is formed on the tower top. After the independently researched and developed oxidation tower is adopted, the methylbenzene oxidation reaction is an exothermic reaction, the heat exchange operation process is performed outside the tower, so that the construction investment of a methylbenzene oxidation workshop in benzoic acid production can be saved by 50 percent, and a previously adopted water-circulating pump of 55kw / h is replaced by a water-circulating pump of 22kw / h by virtue of a technology of circulating cooling outside the tower, and electric energy is saved by 40 percent by the methylbenzene oxidation tower. The methylbenzene oxidation tower is convenient to maintain and operate.

Description

technical field [0001] The invention relates to a benzoic acid product production system, in particular to a novel oxidation tower proposed in the toluene oxidation process, which is a toluene oxidation tower used in the production of benzoic acid with a level of more than 10,000 tons in actual industrial production. Background technique [0002] In the original production process of industrial benzoic acid products with an annual output of 30,000 to 50,000 tons, the oxidation tower equipment required for toluene oxidation is 18.5 meters high and 1.5 meters in diameter ( Figure 4 ). The original toluene oxidation production process of benzoic acid product is as follows: image 3 shown. Put the toluene into the tower, and then heat all the toluene in the tower and pass it into the air to oxidize the toluene. Since the toluene oxidation reaction is an exothermic reaction, heat exchange operation is required in the tower. Generate crude benzoic acid after the completion of t...

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Problems solved by technology

When using the original oxidation tower and toluene for oxidation, the heat exchange operation is carried out in the tower; the existing problems are: firstly, due to the high height of the equipment, the investment in the infrastructure of the equipment is large, and the production operation is inconvenient, and there is a safety hazard in the production operation Hidden dangers, such as falling from a high altitude; secondly, due to the heat exchange operation in the tower, when the heat exchange device leaks, the condensed water in the heat exchange device is mixed with the oxidizing toluene liquid, which cannot be detected in time at high temperature. Continuing production operations will cause major safety accidents; and there are disadvantages that are not convenient for timely maintenance

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