Phosgene

CAS RN: 75-44-5

Storage Conditions

Phosgene must be stored to avoid contact with water, moisture, or steam since violent reactions occur. Store in tightly closed, steel containers in an isolated area away from the work area and separated form all other materials, as well as sunlight. Although phosgene in anhydrous equipment is not corrosive to ordinary metals, in presence of moisture, use monel, tantalum, or glass-lined storage containers. Phosgene should be stored away from heating and cooling ducts. Containers should be frequently inspected for leaks.
Phosgene should be stored in appropriately labelled corrosion-resistant steel cylinders that conform to rigid safety-design specifications for this chemical. Storage should be in cool, dry, and well-ventilated fire-proof rooms isolated from the work area. Ambient air monitoring should be provided and ventilation should be located at floor level. Protect cylinders against physical damage, and secure to prevent falling or rolling. Because phosgene reacts with water, great care should be taken to prevent contamination with water, since this could lead to increased pressure in the tanks with possible resultant rupture. Phosgene containers should be frequently inspected for damage and prolonged storage should be avoided.
Store in a cool, dry, well-ventilated location. Outside or detached storage is preferred. Must be stored in a dry location.
Storage temperature: ambient
Large quantities of phosgene should be stored in a dry, cool, well ventilated and fireproof room.
Phosgene storage areas shall be completely isolated from work areas. If separated from a work area by a common wall, all holes, ducts, doors, and pass throughs which could allow phosgene to enter other parts of the plant shall be secured and sealed. Central cooling and heating ducts shall not extend to phosgene storage enclosures.
Phosgene containers shall be secured to prevent falling, upsetting, or rolling, shall be protected from mechanical damage, heat, moisture, and corrosion, should be used on a first-in, first-out basis, and shall be limited to the minimum necessary for the operation, should not be stored with full containers. full containers shall be so marked, and containers in use shall be plainly marked "In Use" to differentiate from those not in use.
Storage and transportation of phosgene are avoided as far as possible for safety reasons. Generally, only the minimum amounts necessary in the course of the process are stored at intermediate stages. Steel vessels are suitable containers if corrosive impurities, especially water, can be excluded.
... The phosgene cylinder receipt and handling operations were completely isolated and enclosed. The reactors and reactor control panel were equipped with a high capacity local exhaust ventilation system that was continuously vented through potassium-hydroxide scrubbers. A system of phosgene analyzers continuously monitored all phases of the operation. The analyzers monitoring the ambient air were set to alarm at 0.1 ppm phosgene and those that monitored the scrubber exhaust streams were set to alarm at 2.5 ppm. Personal exposure monitoring was practiced by all employees working in the reactor and storage areas.
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