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Hydrogen sulfide is generally used in reactions such as thiolation, and hydrogen sulfide gas in steel cylinders is generally used directly
1.
Hydrogen sulfide is a colorless gas with irritating and suffocating properties
(1) As long as the concentration of hydrogen sulfide is extremely low, it has a odor.
(2) Hydrogen sulfide poisoning in daily life is mostly due to the degradation and degradation of proteins in organisms or fecal organic matter to produce amino acids , among which cystine or cysteine undergoes anaerobic fermentation under the action of anaerobic bacteria.
Mild poisoning: Mild poisoning is mainly irritation symptoms, manifested as watery eyes, eye tingling, runny nose, burning throat, or accompanied by headache, dizziness, fatigue, nausea and other symptoms
Moderate poisoning: After exposure to high concentrations of hydrogen sulfide , the manifestations of encephalopathy are significant, headaches, dizziness, irritability, staggering gait, irritability, confusion, delirium, epileptic convulsions can be generalized tonic-clonic seizures, etc.
Severe poisoning: shock-like deaths can occur after exposure to extremely high concentrations of hydrogen sulfide , that is, respiratory arrest within seconds or minutes after exposure, and cardiac arrest within a few minutes; it can also be unconscious immediately or within a few minutes with sudden breathing Stop and die
2.
(1) There must be a fully complete and rigorous exhaust gas absorption device, and the exhaust gas shall be absorbed by 5% NaClO
(2) The bubble port is 2 to 3 cm below the liquid surface
(3) Control the rate of gas release: some bubbles appear from the liquid surface when not stirring, and no bubbles are visible from the liquid surface when stirring
(4) Wear a filter-type gas mask (half mask) and pull down the fume hood door
(5) For the quenching of the reaction solution, an excess (usually 2 molar ratios or more) of NaClO (available chlorine 10%-20%) or H 2 O 2 (5%-10%) can be used to oxidize H 2 S into sub Sulfate or sulfate , so that it is not odorous, low-toxic or even non-toxic after treatment
