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[Chemical Knowledge]：Specification for storage and transport of PX (paraxylene)

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PX (p-xylene) is an important raw material for chemical production, which is widely used in plastics, fibers, solvents and other fields. However, due to its flammable and toxic properties, the storage and transportation of PX requires strict compliance with relevant regulations to ensure safety. This article will detail the safety storage and transportation specifications of PX. Overview of the physicochemical properties and dangers of

1. PX

PX is a colorless transparent liquid with an aromatic odor. It is insoluble in water, but miscible with organic solvents such as alcohols and ethers. PX has a low flash point, is easy to burn, and produces toxic smoke when burned. In addition, PX is also irritating and can cause skin and respiratory allergies.

2. PX safety storage specification

1. Storage facilities require
PX should be stored in a dedicated storage tank, the storage tank should meet the relevant standards, with good sealing performance and fire and explosion prevention measures. The storage tank shall be provided with liquid level gauge, thermometer, pressure gauge and other monitoring instruments, so as to timely grasp the status of PX in the storage tank.
2. Storage environment requirements The storage environment of
PX shall be dry and well ventilated, and shall be far away from fire, heat source and other dangerous sources. The storage area shall be provided with fireproof isolation belt and equipped with corresponding firefighting equipment.
3. Storage operation requires that when PX is stored
, the filling amount of the storage tank should be strictly controlled, and it should not exceed 80% of the storage tank volume. At the same time, the storage tank should be inspected and maintained regularly to ensure that it is intact.

3. PX safety transport specification

1. Transport vehicle requirements
PX transport should use a dedicated tank car, the vehicle should meet the relevant standards, with good sealing performance and fire and explosion prevention measures. Tank car should be equipped with liquid level gauge, thermometer and other monitoring instruments, in order to timely grasp the state of PX in the car.
2. Transportation route requirements The transportation route of
PX should choose the road with smooth road and smooth traffic, and try to avoid passing through densely populated areas and sensitive areas. At the same time, you should know the road conditions and weather conditions along the way in advance to ensure transportation safety.
3. Transportation operation requirements When
transport PX, keep the speed stable and avoid operations such as sudden braking and sharp turns. At the same time, the tank car should be regularly inspected and maintained to ensure that it is intact.

4. PX leakage emergency treatment measures

During the storage and transportation of PX, if a leakage accident occurs, the following emergency treatment measures should be taken:

1. Immediately cut off the leakage source, close the corresponding valve or take other measures to prevent PX leakage.
2. Cover and collect the leakage with sand, dry lime and other adsorption materials to prevent it from spreading to the environment.
3. Ventilate the leakage area to reduce the concentration of PX.
4. If the leakage is large, it shall be reported to the local environmental protection department in time and disposed of in accordance with relevant regulations.

In short, PX is an important raw material for chemical production, and its safe storage and transportation are very important. Relevant enterprises and personnel should strictly abide by relevant specifications to ensure the safety of storage and transportation of PX and prevent accidents.

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