Does ethylene react with mercury chloride?
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Some of the hydrogen chloride used in synthesis at our plant is produced by the ethylene method, and it contains a small amount of ethylene. Recently, it has been found that the synthesis conversion rate is low, the catalyst lifespan is **reduced**, and the system pressure remains high. We suspect that ethylene may be causing the catalyst poisoning. I wonder if anyone knows whether ethylene reacts with mercuric chloride, and what the mechanism is? This post was last edited by edc1233 on 2008-9-16 16:37.]
This issue needs to be considered from the following aspects: 1. First, it is necessary to determine the actual ratio of C2H2 to HCL; one cannot rely solely on the readings provided by the flow control system. 2. Is the temperature for the transformation reaction too high? 3. Is the moisture content of the mixed gas too high? Adding too much acid can also lead to mercury loss. 4. The quality of the catalyst itself; if it has not been properly impregnated, it may only exist on the surface of the activated carbon and not reach its interior. 5. The S and P content of acetylene. . . . 6. This is no longer a question of whether this substance can poison the catalyst. . . :o:lol :o
It seems you still don’t quite understand what I’m saying. We have checked all the situations you mentioned, and there are no issues ； If it’s one of these problems you mentioned, then I wouldn’t need to raise this issue here.
As for ethylene and mercuric chloride, no reaction should occur. It must be other factors causing it. I hope the original poster can share the results with everyone.
All possible causes of catalyst failure have been checked, but the problem still cannot be resolved. At present, we can only speculate that ethylene may react with mercury chloride under certain conditions.
Then conduct pore volume and BET tests on the catalyst.
Acetylene cannot react with mercury catalysts, which proves this point! !
Based on the owner’s description of the issue, there seems to be a serious problem with the dehydration system. It is necessary to check for catalyst caking and pulverization; if caking and pulverization are severe, it indicates that the raw gas contains high levels of water. High water content in the raw gas also leads to an increase in side reactions and a reduction in catalyst activity； Another factor is the purity of the raw material gas; if the hydrogen chloride gas produced contains a high level of ethylene, which results in low purity of hydrogen chloride, then the synthesis process will reduce the likelihood of a reaction between hydrogen chloride and acetylene ； Once again, to address the shortened usage time of the catalyst, it is possible to conduct quality tests on the catalyst or compare it with previous data; there may be issues with the catalyst’s quality.
Acetylene can reduce mercuric chloride to elemental mercury! —— It requires experiments to determine whether ethylene and hydrogen chloride undergo an addition reaction in the presence of mercury chloride as a catalyst. It’s hard to say whether a redox reaction will occur with mercuric chloride if there is no reaction at all! This post was last edited by tfx511024 on 2009-1-15 18:01.]
Acetylene reacts with mercury catalysts; the mechanism for this reaction can be found. Both ethylene and acetylene possess double bonds, which gives them considerable similarities. It is likely that the person asking the question should study carefully the reaction mechanism between acetylene and mercury catalysts. If double bonds are the factor at play, it can basically explain why ethylene can react under certain conditions.