Dave Dickey Forum Moderator 292 Posts
Re: Is blending wax with a solvent a bad idea?29 May 2012 at 1:29pm
This whole process sounds like an extremely bad idea and potentially a very hazardous situation. Heating the wax to a temperature above the flash point of the solvent means that all oxygen must be purged from the vessel and vapors must not be allowed to escape. If the wax must be heated to remove it from a drum, directly transferring it into the solvent would create a seriously dangerous situation.
If the flammable solvent will actually dissolve the wax, then the best suggestion is to melt the wax in the drum and pour it into small blocks. Then allow the blocks to cool, before adding them to the solvent and mixing until the wax dissolves. Even under those conditions, a closed tank, with a nitrogen purge, and pressure relief / fire suppression system may be needed. This question is much less about mixer design and much more about a hazards analysis.
The answers by this expert are based on the best available interpretation of the information provided. The consequences of the application of this information are the responsibility of the user. If clarification is needed, please submit a further question.
We would like to blend a solid wax with a solvent to make it flowable for our customer. Some information available: 1) The wax melting point is around 40 deg C to 60 deg C 2) The solvent use is aromatic solvent with flash point less than 40 deg C Questions are: 1) Is jacket tank suitable for this type of blending? Any recommended blade design? 2) Once we melt the solid wax, the temperature is above the flash point of the solvent, which type of the blending tank design will be suitable? Should we have nitrogen purge? 3) What is the normal way to transfer the solid wax into the tank since the wax is received in a 55-gal drum?
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