Is it necessary to build insulated storage tanks with heating for storing the solvent?
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Currently, there are two chemicals that need to be stored in a temperature-controlled environment. One of them is p-chlorotoluene, with a melting point of 7.2 degrees. It was mentioned that a large storage tank should be used for storing this substance, but it’s necessary to prevent it from freezing in winter. Would using polyurethane insulation for the tank be sufficient for this purpose? Is it better to have a jacket with hot water for better heating and insulation? There’s also o-chlorobenzonitrile, which is even more confusing. It was originally a solid material to be fed in, but when the manager noticed a strong odor during feeding, he decided to place it in a heating chamber to melt it first before pumping it in. However, o-chlorobenzonitrile has a melting point of 43-46 degrees; at such temperatures, even heating systems would face difficulties, as hot water requires temperatures of 60-70 degrees. Moreover, it needs to melt at rest, which makes things rather difficult. Although **furan solvents can be added for dissolution, it should still be quite difficult. Could everyone help me analyze whether it’s feasible to use a heating system? ========================= Thank you all for your answers. There is one additional point that needs to be considered: both chemicals are used in anhydrous reactions. So, the use of hot water for heating and maintaining temperature, especially within coiled tubes, might pose some risks, right? What if there is a leak? Additionally, for chlorotoluene: what I need to build are storage tanks for the raw material, to hold large quantities over a long period of time. As for o-chlorobenzonitrile, according to the supervisor’s instructions, it should be melted in the large raw material tank in a heated environment and then fed in under vacuum. This post was last edited by lioe on 2008-2-18 14:03]
For p-chlorotoluene, it is not sufficient to use only polyurethane insulation; steam heating via a high-jacket system or electric heating is necessary； O-chlorobenzonitrile is best dissolved in **furan and then pumped in; it can be used for heating, but it’s not necessary. Just get a hot tub!
p-Chlorotoluene has a melting point of 7.2 degrees; it requires heating. In addition to insulation, the storage tank also needs heating – a jacket is not necessarily necessary; coiled tubing can be used for heating； O-chlorobenzonitrile, with a melting point of 43–46 degrees; if no solvent is used, a heating container is necessary, and heat transfer should be achieved through jacketed heating ；
p-Chlorotoluene has a melting point of 7.2 degrees; the pipelines need to be insulated, and the storage tanks also require insulation. It is possible to install insulated pipelines within the foundation of the storage tanks； O-chlorobenzonitrile has a melting point of 43–46 degrees; the pipelines need to be insulated. It is possible to use a jacket or coiled tubes filled with hot water in the dissolution tank for heating. For insulation, rock wool is the preferred material over polyurethane.
Quote (p-chlorotoluene: What I need to build are storage tanks for the raw material, which are used to hold large quantities over a long period of time. As for o-chlorobenzonitrile, according to the manager’s instructions, it should be melted in large drums in a heated room and then fed in under vacuum. First of all, I must say that your manager is quite good – they have taken the workers’ safety into consideration. For p-chlorotoluene, consider the amount used per unit time and the dissolution time. If time and space permit, a high-rise greenhouse is an option. The hazards during operation are relatively low. Heating the greenhouse can effectively prevent water-related problems. I agree.
How do you control the temperature and melting process when using a heater? I guess it’s also difficult to achieve melting by letting it sit there at a temperature higher than the melting point. You still need to stir or something, so isn’t it the same as just adding it directly?
Solvents with low melting points need to be taken into consideration, and this depends on the local conditions. For materials that tend to solidify at lower local temperatures, heating should be considered. Or, add coils to the storage tank and use a jacket for insulation.