[Chemical Knowledge]：Specification for storage and transportation of sodium hydrosulfide

Title: Safety storage and transportation specifications
of sodium hydrosulfide in the field of chemical production raw materials
Abstract:

of sodium hydrosulfide as a common chemical production raw materials, because of its strong alkaline and reductive, so in the storage and transportation process need to strictly abide by the relevant safety specifications. This article will introduce in detail the physical and chemical properties of sodium hydrosulfide, risk overview, first aid measures, fire protection measures, leakage emergency treatment, operation disposal and storage, contact control/personal protection, physical and chemical characteristics, stability and reactivity, toxicological data, ecological data, waste disposal, transportation information and regulatory information, etc. to ensure its safety and reliability.

1. physical and chemical properties

sodium hydrosulfide is a white crystalline powder with strong alkalinity and reducibility. Its molecular formula is NaHS, molecular weight is 56.06, melting point is 100 ℃, boiling point is 140 ℃. Sodium hydrosulfide is readily soluble in water, producing sodium hydroxide and hydrogen sulfide.

2. Hazard Overview

Sodium hydrosulfide is a strong irritant to the eyes, skin, and mucous membranes, and inhalation of its vapors may cause respiratory irritation. Misuse can cause digestive tract burns, mucosal erosion, bleeding and shock. In addition, sodium hydrosulfide reacts with acid to release flammable hydrogen sulfide gas, which reacts violently with oxidants and acidic substances.

3. first aid measures

skin contact, immediately remove contaminated clothing and rinse with plenty of flowing water for at least 15 minutes. For eye contact, immediately lift the eyelid and rinse thoroughly with plenty of flowing water or saline for at least 15 minutes. Inhalation should move the patient to fresh air to keep the airway open. If taken by mistake, gargle immediately, take milk or egg white orally and seek medical attention immediately.

4. fire prevention measures

sodium hydrosulfide shall be stored in a cool and ventilated special warehouse, away from kindling and heat sources. It should be stored separately from oxidants and acids, and mixed storage should not be allowed. Equipped with corresponding types and quantities of fire fighting equipment and leakage emergency treatment equipment. The storage area shall be provided with suitable materials to contain spills.

5. leakage emergency treatment

isolate the leakage pollution area and restrict access. It is suggested that emergency personnel should wear dust mask (full face mask) and acid and alkali resistant working clothes. Do not touch broken containers and spills until you put on appropriate protective clothing. Cut off the leak source as much as possible. Small amount of leakage: avoid dust, use a clean shovel to collect in a dry, clean, covered container. Large leakage: covered with plastic sheeting, canvas. It is then collected for recycling or transported to a waste treatment site for disposal.

6. operation Disposal and storage

operation precautions: Confined operation, provide adequate local exhaust. Prevent dust from being released into the workshop air. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that the operator wear a dust mask (full face mask), rubber acid and alkali resistant clothing, and rubber acid and alkali resistant gloves. Keep away from fire and heat sources. Smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Avoid creating dust. Avoid contact with oxidants and acids. Particular care should be taken to avoid contact with water. Equipped with corresponding types and quantities of fire fighting equipment and leakage emergency treatment equipment. Empty containers may leave harmful substances.

storage precautions: stored in a cool, ventilated special warehouse, away from fire, heat. Prevent direct sunlight. It should be stored separately from oxidants and acids, and mixed storage should not be allowed. Equipped with the corresponding variety and quantity of fire fighting equipment. The storage area shall be provided with suitable materials to contain spills.

7. exposure control/personal protection

occupational exposure limit: China MAC (mg/m3): no standard former Soviet Union MAC (mg/m3): no standard TLVTN: no standard TLVWN: no standard monitoring method: engineering control: closed operation, providing sufficient local exhaust. Respiratory system protection: when the concentration in the air exceeds the standard, you must wear a self-priming filter dust mask. Emergency rescue or evacuation, should wear air respirator. Eye protection: wear chemical safety goggles. Body protection: wear rubber acid and alkali resistant clothing. Hand protection: wear rubber acid and alkali resistant gloves. Other protection: no smoking, eating and drinking in the workplace, wash hands before meals. After work, shower and change clothes. Maintain good hygiene habits.

8. physical and chemical properties

appearance and properties: white to colorless, hydrogen sulfide odor of crystalline powder or flaky crystals. Melting point (C): greater than 100 relative density (water = 1):1.79 solubility: soluble in water, soluble in organic solvents such as methanol. Main uses: used as analytical reagents, etc. Forbidden: strong oxidant, strong acid. Avoid contact conditions: humid air. Polymerization hazards: no polymerization decomposition products: hydrogen sulfide, sulfur oxide.

9. stability and reactivity

stability: stable polymerization hazard: no polymerization to avoid contact conditions: heat forbidden substances: strong acid, strong oxidant dangerous decomposition products: hydrogen sulfide combustion (decomposition) products: hydrogen sulfide, sulfur oxide toxicity classification poisoning acute toxicity oral-rat LD50: 560 mg/kg stimulation data eyes-rabbit 500 mg/24 hours severe skin stimulation-rabbit 500 mg/24 hours severe stimulation inhalation-rat TCLo: 1400ppm/4 hours dangerous characteristics when exposed to acid, flammable hydrogen sulfide gas can react strongly with oxidant, causing combustion or explosion, reacting with water or water vapor, releasing toxic or