For the next few months, the Higman Training Newsletter will highlight the products carried aboard Higman's barges. The information below is general and is not meant to replace the Material Safety Data Sheet (MSDS). For detailed product safety and health information, be sure to read the most current MSDS for the product you are interested in.
Today's Chemical is:
Paraxylene
What is it?
Paraxylene (PX) is used primarily as a feedstock for the manufacture of purified terephthalic acid (PTA), which is an acid formed by the oxidation of paraxylene (C 8 H 10), an aromatic hydrocarbon. Terephthalic acid is an important chemical in the production polyethylene terephthalate (PET), a strong yet lightweight plastic. PET is used to make many products, such as polyester fabric, cable wraps, films, transformer insulation, generator parts, and packaging.
The shirt you are wearing, unless it is pure cotton, was probably manufactured with polyester fiber that started with paraxylene as a raw material.
How is it shipped?
Paraxylene is a clear colorless liquid with a characteristic aromatic odor. It is shipped typically by tank barge or rail tank car. Tanks must be clean, odor free and liquid free before loading.
Since the freezing temperature of PX is 56°F, it is normally loaded above 70° F. At discharge, if the tank temperature is below 70°F, steam coils in the barge are used to heat the PX to about 80°F. Typically at the steaming plant, the cargo temperature will raise about 1°F per hour. At completion of discharge, internal tank valves are left open to prevent valve freeze up and line plugs.
When loaded at the BP Chemical, Decatur Marine Terminal, vapor recovery is used.
What are my concerns?
Although paraxylene can be handled with a low degree of hazard, exposure to this product should always be minimized. wear all recommended PPE.
Eye contact: Contact with eyes causes irritation. First aid - Flush eyes with water immediately while holding eyelids open. Remove contacts if worn and continue flushing. Get medical attention if irritation persists.
Skin contact: Irritating. First aid - Flush with large amounts of water. Get attention if irritation persists.
Ingestion: If swallowed, considered practically non toxic to internal organs. Danger comes if it gets into lungs which can cause severe injury or death. First aid - Do not induce vomiting, give person a glass of water or milk, get medical attention.
Inhalation: May cause irritation to the respiratory tract. May cause headaches and dizziness. May have central nervous system effects at concentrations above recommended exposure limits. First aid - Move effected person to fresh air. Give oxygen if breathing is difficult. Perform artificial respiration if breathing has stopped. Get prompt medical attention if symptoms continue..
Environmental concerns: More than 99%of PX released to the environment is quickly evaporated into the atmosphere. PX is readily biodegradable.
Fire Fighting: Fires involving paraxylene can be safely extinguished with foam, dry chemical or carbon dioxide. Use water as a fog spray in flooding quantities; solid streams of water may be ineffective. Cool exposed containers with water