Best Price for Refrigerant Propane R290 for venezuela Factory
product information Name：Propane R290 Brand：HUAFU Producer：No.48 Donggang 1st Road, Quzhou City,Zhejiang,China Storage：In shade,not direct to sunlight MF： CH3CH2CH3 丽：44. 10 Physical &chemical Properties: ： Colorless and Odorless； Boiling point： -42. 1°C, Critical temperature： 96.6°C ； Critical pressure Mpa： 4.248, ODP： 0, GWP： 3.3 USE： For refrigerant, for central air cinditioning, heat pump, air cinditioning and other small household refrigerant equipment, replacement of...
Best Price for Refrigerant Propane R290 for venezuela Factory Detail:
Name：Propane R290 Brand：HUAFU
Producer：No.48 Donggang 1st Road, Quzhou City,Zhejiang,China
Storage：In shade,not direct to sunlight
MF： CH3CH2CH3 丽：44. 10
Physical &chemical Properties: ： Colorless and Odorless； Boiling point： -42. 1°C,
Critical temperature： 96.6°C ； Critical pressure Mpa： 4.248, ODP： 0, GWP： 3.3
USE： For refrigerant, for central air cinditioning, heat pump, air cinditioning and other small household refrigerant
equipment, replacement of HCFC-22 also can be used for metal gas.
Disposable Cylinder: 5kg/13.4L、5. 5kg/13.4L、9kg/22.3L、9. 5g/22.3L
Recyclable Cylinder: 50kg/118L、 164kg/400L、 328kg/800L、 380kg/926L Tank Car： 23. 5T/58M3
ISO Tank： 10T/24M3 Technical Specification:
Product detail pictures:
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We prepare diethyl oxalate via the reaction between oxalic acid and ethanol under reflux, then purify our product by distillation and then finally by washing to give a good yield.
This is a quick video showing how to make diethyl oxalate, an ester which we’re planning to use in an up-coming reaction.
We’re starting here with 100 grams of oxalic acid dihydrate. To get a good yield we’ll first need to convert this into anhydrous oxalic acid.
Pour into a pyrex baking tray and bake in the oven at 140 degrees C for 2 hours.
Break up the solid occasionally and then at the end weigh the white powder that remains.
After 2 hours in the oven the crystals look slightly different and the weight has decreased to 74 grams.
This is good enough.
Place the relatively anhydrous oxalic acid into a 500ml flask.
Now prepare 200ml of absolute ethanol. It is important that this is water-free for a good yield.
Add this to the flask.
The esterification is catalysed by acid, and oxalic is strong enough to act as its own catalyst.
You can add 1ml of concentrated sulfuric acid to the mixture but we’re found it makes little difference.
Give the mixture a stir and you’ll see that most of the acid goes into solution in the ethanol, but there’s no reaction as yet.
Now attach a condenser and set up for reflux.
Get a strong reflux going in the flask and keep this going for 2 hours.
Over this time you won’t see much visible change in the reaction mixture.
Here we are after 2 hours of refluxing. There’s hardly any visible change but the mixture has a pleasant and definite slightly sweet smell of rum.
This is due to small amounts of impurity which we’ll remove.
Our next step is to remove excess ethanol. So allow the flask to cool slightly and then set up for simple distillation.
We allowed the flask to cool down to room temperature first to see if any oxalic acid crystallised out. None did as you can see here.
Set up for distillation. We used a thermometer to track the different fractions coming off the liquid.
First off is excess ethanol around 80 degrees C.
There is probably some water in here as well as the azeotrope, but we collected around 120 ml.
Then the temperature of the vapours rose to 100 degrees and we collected pure water.
Then the temperature rose still further to around 160 degrees and we started to collect a colourless liquid.
The temperature of the vapour then rises to around 175 degrees C at the end of the distillation.
During the distillation you’ll see some smoke-like fumes appearing in the apparatus. This is almost certainly excess oxalic acid decomposing.
This means that there may be a small amount of water carried over into our product, but it also means that there are also potentially some fumes of carbon monoxide being formed as well.
This is highly toxic so be careful and use adequate ventilation as it is colourless and odourless and won’t give you any warning.
At the end of the distillation a small amount of char remains in the flask, but nothing else.
Here’s our distillate starting from 160 degrees C. It is fairly pure but does contain a small quantity of water and decomposition products.
So prepare 40ml of a saturated solution of sodium chloride in water.
Add the crude prodduct to a separating funnel and then add the saturated sodium chloride solution – this should sink to the bottom.
Shake the mixture well and then allow the laters to separate. Our product is the top layer.
Separate off the bottom brine layer which should now contain any residual alcohol, formic acid and any other water soluble impurities.
And we’re left with our product. Separate this off into a storage container. You can also dry it using anhydrous calcium chloride if you want to.
And here’s our product. 70g of diethyl oxalate. This is a 60% yield on the starting oxalic acid dihydrate.
For information the weight difference between the distillate collected and the final product was only 2 grams.
The product has a slightly oily consistency and an unusual fresh and fruity aroma a bit like grape juice.
It dissolves very slightly in water and easily forms a bottom layer.
Thanks for watching and stay tuned for more reactions.
By Grace from Swedish - 2016.09.28 18:29
Perfect services, quality products and competitive prices, we have work many times, every time is delighted, wish continue to maintain!
By Alexandra from America - 2016.09.30 16:36