Benzene in butane

So we gave @SolventDirect a shot at our business as he reached out to us and said they would be able to provide coa’s with every batch they deliver and they would match the lot numbers of the tanks. Pretty interesting the tanks came looked dirtier and older then most the tanks we used to get, but they did have a pretty sd shrink wrap on the valve! We ended up not recieving any coa’s and were told that they were going to be emailed over. Later that day I went to talk to our director of operations and asked if we had got the coa’s for the gas we received and I was told we were now getting the run around. They are having issues locating the coa’s that match the lot numbers.

So far I haven’t found one single solvent company that can provide a coa for the batches of gas they sell to their customers. Something is super fishy.

@SolventDirect you talked so much game and im really disappointed. Please send us the damn coa’s or refund our purchase and pick up the tanks. This was a deal breaker for us. No matching coa’s no business.

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Well if you have no luck with competent supplier…even though i dont fill tanks. I do have a distribution agreement with a gas supplier and can insure that the tank will come with a COA or i will 100% refund your purchase… and you can keep the gas!

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Hi John,

We do not recondition the powder coat on the outside of cylinders, we only decontaminate the inside. Our cylinders tend to get more mileage than you would find with industrial LP cylinder suppliers because we prevent corrosion and rust on the inside which extends the life of the cylinder under federal law.

This process of regular and frequent decontamination means our LP cylinders get mileage on the outside than you might find from other distributors that do nothing to prevent the accumulation of contaminate, corrosion and rust on the inside cylinders refilled or “topped off” without ever being decontaminated.

It looks like we delivered to you yesterday, 8/31. I am still trying to find out which rep you spoke to and when you requested the COA and COD documentation.

Please see attached.

Have you distilled the gas? What were your findings compared to other supply?

Our records indicate we delivered:

RD872310

TR382970

394068D

0017870C

TR398761

0014640C

417653D

COA and COD’s with corresponding DOT #s per below.

We are very sorry you experienced this delay.





COD - 5:20:21.pdf (385.7 KB)
COD - 5:21:21 .pdf (350.7 KB)

We haven’t used it yet because I wasn’t wasting my time if coa’s for the tanks didn’t exist.

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I just got off the phone with our customer service manager and there is some spot training happening as we speak. I’m very sorry for the delay in getting back to your team yesterday.

We have been slammed the last few weeks with an influx of new business brought about by the recent contamination issues we are seeing from industrial suppliers selling “high purity” with little understanding of the risks of topping recycled cylinders without decontamination. We are knee deep in training new team members and processing orders as quickly and carefully as possible despite rising freight costs driver shortages.

We maintain a repository with all COA and COD documentation. We are the only supplier certifying our 3 Phase Cylinder Decontamination with a signed and serialized COD.

In the future, we will make sure COA/COD documentation is provided hard copy on all orders. Further, we have some patented technology we are rolling out soon that will bring this level of transparency in manufacturing and compliance to your fingertips.

In the meantime, we look forward to your findings. Not only is our gas testing consistently over 99.7%+, but by decontaminating the cylinders before refill, you should not have any mystery oil or variable contaminate exposure.

If anyone is having a problem getting COA/COD documentation in the future, please ask to speak to a manager so we can immediately address your concern.

Thank you

It’s also important to note the differences between COA’s, COD’s and COC’s when it comes to maintaining a clean chain of custody and gas purity.

Certificates of Conformance (COC)
This certificate defines the minimum gas specifications for product distributed as “UHP” grade and provides quality assurance for gases filled within a batch.

Certificates of Analysis (COA)
This certificate defines the standards of gases analyzed by individual cylinder/ vessel and is an actual cylinder/vessel analysis for the UHP specification. Most suppliers charge for this service.

Certificates of Decontamination (COD)
This certificate defines the standard of cylinder decontamination provided by following a specific SOP for cylinder decontamination as designed for UHP specification.

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I do have a question… do you test every individual cylinder once its filled or is that COA for the Lot and you add the cylinders you fill from that lot?

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This is my geuss. Can’t see them testing each cylinder…

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says “analyzed by individual cylinder/ vessel” Thats why i find it weird that if your testing each individual cylinder why isnt there an individual COA for each cylinder

all the COAs above are over 90 days old too.

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These are great questions Killa. It takes about 12 weeks for us to get our cylinders sent out, cleaned, refilled and returned. This process is very time consuming, requires significant planning and forecasting and is an expensive process. This is why our product costs slightly more than the other guys topping cylinders out back without ever cleaning, decontaminating or having a specialist check for valve imperfections, threading compromise or other safety hazards.

Further, you may see older COA’s because we use the FIFO (first in, first out) method to make sure that we are turning cylinders as quickly as possible to prevent cylinder corrosion.

The industrial practice of topping off lp cylinders out back is much faster and cheaper, but it exposes your product to the coffee mug analogy. I don’t think we need to re-post the picture, but if a diner served you “clean” coffee in a dirty mug filled with petroleum sediments containing benzene… you get the point.

If you want to read more about our partnership with one of the oldest and most reputable cylinder re qualification companies in the country to adapt medical cylinder cleaning techniques to LP cylinders for extraction, hit our website, go to MORE > BLOG > EVOLUTION OF 3 PHASE CYLINDER DECONTAMINATION.

Keep an eye out for our content suite at Bizcon this year. We are going to be making some big announcements…

We don’t believe “topping” is a safe practice for extraction no matter how short industrial suppliers cut their dip tubes. Our customers save time and money distilling mystery oil and don’t have to expose their people, process, system and product to these dangerous accumulations. And we provide steel, full length, angle cut dit tubes so you can use every last drop. This allows our customers to focus on their highest and best use of time, not re-distilling gas that was compromised by a filthy cylinder and they get to use everything they pay for.

As for the COA definition you’re quoting above, our COA is pulled on the batch before it hits the bulk tank. This is how it is done in food and beverage grade ethanol supply because you’re right, but we are filling 1000’s of cylinders per month and it is not cost effective to test every delivery cylinder. We would be happy to test every delivery cylinder for a service fee like other distributors, but like in food and beverage grade alcohol supply if the bulk vessel is clean and the consumer vessel (the delivery cylinder) is clean, then we have established a clean chain of custody.

This is why a Certificate of Decontamination (COD) is very important to have with the COA. Without a way to verify the delivery vessel meets the purity standard, there is no way to verify the purity standard on the consumer level.

It’s great that we are airing out these unethical practices of topping off tanks repeatedly without ever running a decontamination process. If your supplier can’t show you what they are doing to maintain the purity standard, how do you know the standard is consistent with the source?

What happened to the other suppliers that were on here? Why did they all go so quiet?

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So do you perform any testing on the cylinders after they are filled at all?

Does the composition of the large bulk tank change at all over time? I would imagine since we are all talking benzene in our solvents… Its in the bulk tank too. wouldnt the closer you get to fills near the end of that bulk tank wouldnt the heavier hydrocarbons come out in higher %s…

Just so im not misinterpreating this… The COAs from above are just the diversifieds COAs that you add your cylinder numbers and logos too??

Im wondering where is all the rest of the suppliers!

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I need to get back to our customers. In the meantime, maybe this will help answer some of your questions…

I’m confused as to why you have an issue with us spot testing end user tanks as a final control when this seems to say you don’t test anything after it hits your bulk tank.

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Sorry @The_Lone_Stiller, I confirmed that the media we use are proprietary. What I can share is that the media interacts with targeted contaminants we have identified in “mystery oil” and captures them out of solution while allowing the the desired product to flow through freely. I liken it a bit to CRC on a larger scale and, obviously, for hydrocarbon solvents.

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@MagisterChemist @Kingofthekush420 is there a membrane filter we can use to purify our butane as it leaves the bulk tanks going to our clean system?

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This is exactly why we purify gas after it hits our bulk tank. The pre-bulk test should only serve to confirm what is coming off a truck into the facility. During processing all levels are monitored constantly so we know where we start and where we end. Then spot testing individual cylinders to confirm lack of contamination during filing from bulk tank to end user tank. Our COA’s are generated from the bulk tank, after processing, but immediately before filling.

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Depends what you’re trying to clean / remove

Benzene no, it’s too small

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We’re working on something.

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GasLogix -

Are you still offering this grade of Cortland N-butane?

Cortland Energy COA at 99.996.pdf (121.3 KB)