How is paraffin produced during the dimethyl ether manufacturing process?
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When inspecting the water pipes at the bottom of the vaporization tower, it was found that a large amount of paraffin was present in the water flowing in those pipes, as it was discharged directly onto the ground. It is initially suspected to be caused by methanol, as our company uses crude alcohol to produce dimethyl ether. But it’s not certain whether paraffin will be produced in the dimethyl ether reactor.
It’s unlikely that this comes from methanol
http://wenku.baidu.com/link?url=JLCaxBAXLJVcx_8jsyJVFxl0o9U4N6lALYWE-vKJXHv7Utn5QybeesiD-AilrJ7nu6l8qfwYPiw9PFA0TByDoUB9lHEP-6IG-wtovk7zhme Please take this as a reference; it’s probably caused by methanol.
Does the vaporization tower have a side stream? It should be possible to extract it.
Test the components of the crude alcohol to determine whether paraffin has been synthesized from the substance.
It mainly consists of two parts: first, crude methanol contains a certain amount of long-chain alkanes, that is, paraffins, which end up accumulating at the bottom of the gasification process! Secondly, the dimethyl ether catalyst is a strong dehydrating catalyst; at high temperatures, esterification reactions tend to occur in the catalyst bed, resulting in the formation of wax, which eventually accumulates in the vaporization tower during the recycling process! Wax and paraffin are not the same! The main components are different!
Our company has upgraded a facility in Anhui for the production of dimethyl ether from crude methanol, and over several years of operation no issue related to paraffin has been observed; it is likely that this is caused by the crude methanol
It must be caused by crude methanol； Pure methanol removes fusel oils, water, and the vast majority of impurities from crude alcohol ； The wastewater from the atmospheric pressure tower after distillation contains paraffin ； And since you use crude methanol, it’s easy to imagine
Certainly, it is brought in by methanol; paraffin is not produced during dimethyl ether production