Phthalic anhydride production is very important in various industries. This material is white and is used in various industries. It is a type of divalent acid that is produced using O-Xylene during the reaction. In phthalic anhydride production, O-Xylene combines with hot air and moves into the reactor.

This reactor has tubes with catalyst and crude phthalic anhydride. The condenser is then cooled and reheated after PA condensation. Phthalic anhydride then enters the suspension tower. These steps greatly optimize the phthalic anhydride quality. Finally, phthalic anhydride is produced in the form of white granules or a colorless liquid. In this PETROPROVIDERS article, join us to show you the steps of phthalic anhydride production.

Different stages of phthalic anhydride production

stages of phthalic anhydride production

stages of phthalic anhydride production

There are 3 main steps in producing PA. In these stages, phthalic anhydride is produced in a completely standard and optimal way. These steps are performed in standard and authorized factories; So never repeat these tests at home.

In general, phthalic anhydride is produced from pressurized reactions in reactors. This material is produced in 3 stages, using O-Xylene. O-Xylene is a very widely used material used in the manufacture of various plastic devices in the world. This substance is toxic and should not come into direct contact with human skin.

The first stage of PA production in factories

In the first stage, the filtered air enters the device and is pressurized. This air is heated and converted to steam and enters the mixer. The stored O-Xylene is then tested by a quality control device. This material then enters the evaporator and is placed near the reactor.

It should be noted that the injection of O-Xylene into hot air should have ideal conditions; Because this material will be placed next to the oxidation reactor. At this stage, the flow and temperature of O-Xylene must be carefully controlled and adjusted.

The oxidation reactor is a stable and reliable reaction medium. This substrate takes hot air and O-Xylene and oxidizes them. Inside the reactor, some shells have several tubes. The tubes are placed vertically and filled with catalysts such as titanium dioxide and vanadium pentoxide. At this point, O-Xylene was prepared and the compressed air was heated and fed into the reactor. In the next stages of phthalic anhydride production, interesting things will happen!

Second stage phthalic anhydride production

As mentioned, the oxidation reactor had different catalysts. Hot air and O-Xylene were introduced into this oxidation bed. After the arrival of these two substances, they pass through the catalysts. At this stage of the reaction, gases have been produced that exit the end of the reactor chamber. These gases are exothermic and can be easily removed from the device. These gases neutralize the heat from previous reactions.

To perform this reaction, molten salts are used on the outside of the reactor shell. These salts keep the reactor pressure constant. High-strength catalysts are used to prevent pressure drops.

Maintenance of these catalysts is done using special ceramic rings. These rings will maintain the stability of the catalysts. Various safety and mechanical devices are used to precisely control these retainers.

The third stage of phthalic anhydride production

At this point, the gases produced in the previous reaction are refined. This purification is done using special equipment. This equipment has oil tubes that can generate heat and supply it to the reactor.

In this chamber, the temperature must be constant; External loop ventilation is used to keep the temperature constant. These devices are called condenser switches. At this stage, the exhaust gas temperature is relatively constant; Therefore, to produce the most PA, the oil temperature of the tubes must be controlled and fixed.

In general, computer control systems are used to control reaction conditions. These systems are very accurate and work automatically.

After this step, crude phthalic anhydride is produced, which is in liquid form. The material is then transferred to a heated tank. In the next step, advanced equipment is used for purification and purification of PA.

In all chemical reactions, unwanted products are also produced; These products contain maleic anhydride and are combined with phthalic anhydride. In addition, there are gases such as carbon monoxide and carbon dioxide, all of which are transferred to the catalytic combustion chamber.

One of the most important points in phthalic anhydride production is proper distillation operation. In this process, the temperature, heat, and gas transfer are properly determined. This produces the best phthalic anhydride.

In the PA production process, a small purification column must be placed to suck the air out. This causes the impurities to separate from the final product.

After performing these steps, the phthalic anhydride is transferred to its tank. It is then converted to a vacuum unit to try to obtain pure phthalic anhydride. During this operation, distillation must be performed continuously and phthalic anhydride must be removed from the top of the device. At this stage, the final quality and color of phthalic anhydride are determined; Therefore, it is necessary to comply with the standards set at each stage.

Summary of phthalic anhydride production steps

PA USES IN INDUSTRIES

PA USES IN INDUSTRIES

In this interesting article, we saw the different stages of phthalic anhydride production. PA production consists of 3 stages. It is a type of divalent acid that is produced using O-Xylene during the reaction. In short, in phthalic anhydride production, O-Xylene combines with hot air and moves into the reactor. This reactor has tubes with catalyst and crude phthalic anhydride.

The condenser is then cooled and reheated after PA condensation. The catalysts are then reacted to produce crude and liquid phthalic anhydride. The PA then reaches the storage compartments and is stored there.

phthalic anhydride uses

phthalic anhydride uses

It should be noted that phthalic anhydride is very dangerous! This material is produced in laboratories and factories, with standard conditions. So never try to make phthalic anhydride at home. Phthalic anhydride must be completely sealed after production. This packaging must be completely optimal and done in standard conditions. Standard conditions must also be met for the transport of phthalic anhydride.

What do you think about phthalic anhydride production? What applications does this material have in industries? In the comments section, you can ask us your questions about PA. If this article was helpful to you, share it with your friends. If you want to buy the best quality PA, contact our experts.