Q&A on Purification Technology Version [031]
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What are the main hazards of sulfides in methanol production? Answer: ① Poison the catalyst, causing it to become poisoned and inactive. In methanol production, hydrogen sulfide can permanently poison the methanol catalyst, reducing its activity and leading to a decrease in methanol production. This is because hydrogen sulfide reacts with the copper in the copper-based catalyst to form cuprous sulfide, thereby rendering the catalyst inactive. ②Corrode equipment. In the presence of moisture, gases containing hydrogen sulfide dissolve in water to form hydrosulfuric acid, which can react with metal equipment and pipes to produce corresponding metal sulfides, thereby causing corrosion. The severity of this corrosion increases as the partial pressure of hydrogen sulfide in the gas rises. ③Pollute the environment. Hydrogen sulfide is a highly toxic substance; even small amounts inhaled by the human body can cause symptoms such as headaches and dizziness, while larger inhalations can lead to sudden death. In the air released from vents or gases leaking from equipment and pipelines, hydrogen sulfide settles on the ground, causing varying degrees of environmental pollution. **The industrial hygiene standard is <10mg/m3. Coalification Region Purification Technology Edition – 2017 Coal Chemical Industry “My Technical Upgrades” Contest (Generous Prizes Available) http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for Chemical Engineers – Experience Sharing Event “Learning from Others’ Experiences” http://bbs.hcbbs.com/thread-1808158-1-1.html
It poisons the catalyst, clogs pipeline equipment, corrodes pipeline equipment, contaminates solvents, pollutes the environment, and reduces product quality.
1. Causes catalyst poisoning. Zinc-chromium catalysts have good resistance to sulfur; the sulfur content in the fresh gas should be below 50PPm. Copper-based catalysts have strict requirements regarding sulfur; the sulfur content in the feed gas must be low, with the ICI process requiring a level below 0.06 Ppnl, and the Lurgi process requiring a level below 0.1 PPm. If it contains 1 PPM, after half a year of operation, catalysis ② leads to carbonyl corrosion of pipes and equipment. ③This leads to a decline in the quality of crude methanol. Sulfur introduced into the synthesis loop causes side reactions, resulting in impurities such as thiols and dimethyl sulfide, which affects the quality of the crude alcohol. Moreover, when it enters the distillation unit, it causes corrosion of the equipment and pipelines.
1) Causes catalyst poisoning. 2) Causes corrosion of pipes and equipment. 3) It causes a decline in the quality of crude methanol.
It causes corrosion of pipeline equipment, leads to catalyst poisoning and a reduction in its activity, resulting in a decline in the quality of methanol
①Poison the catalyst, causing it to become poisoned and deactivated. In methanol production, hydrogen sulfide can permanently poison the methanol catalyst, reducing its activity and leading to a decrease in methanol production. This is because hydrogen sulfide reacts with the copper in the copper-based catalyst to form cuprous sulfide, thereby rendering the catalyst inactive. ②Corrode equipment. In the presence of moisture, gases containing hydrogen sulfide dissolve in water to form hydrosulfuric acid, which can react with metal equipment and pipes to produce corresponding metal sulfides, thereby causing corrosion. The severity of this corrosion increases as the partial pressure of hydrogen sulfide in the gas rises. ③Pollute the environment. Hydrogen sulfide is a highly toxic substance; even small amounts inhaled by the human body can cause symptoms such as headaches and dizziness, while larger inhalations can lead to sudden death. In the air released from vents or gases leaking from equipment and pipelines, hydrogen sulfide settles on the ground, causing varying degrees of environmental pollution. **The industrial hygiene standard is <10mg/m3.
Sulfides can cause poisoning and deactivation of synthetic catalysts
It poisons the catalyst, clogs pipeline equipment, corrodes pipeline equipment, contaminates solvents, pollutes the environment, and reduces product quality.
1) Causes catalyst poisoning. 2) Causes corrosion of pipes and equipment. 3) It leads to a decline in the quality of crude methanol.