Dynadroit Biodiesel Processor Gallery
By Rick Da Tech
In 2006 This processor was previewed at the Collaborative Biodiesel Conference. It is no longer available, but at the time it was state of the art. The text below was from the Dynadroit website, captured from the wayback machine. It describes the processor better than I would be able to do in my own words.
These processors are a commercial grade product designed to be long lasting, reliable, and capable of processing routinely regardless of changes in ambient temperature, time of the year, or location. Each kit contains two epoxy coated steel tanks and a pump/electrical stand.
The early fabrication is shown in this picture. It is still done by the same firm which has been in the sheet metal business for more than 35 years. This tank (100 gallon processor tank), and all of them are made from 16 gauge steel, angle iron flanges, rods, nipples and couplings. The drilling, bending, and welding is done by a very experienced sheet metal fabricator. The tanks were pressure tested to verify that the tank is sealed even though there is very little pressure involved in the processing actions. The steel is used for tanks because they will last indefinitely and can handle heat necessary for various processes.
The coating is a red oxide color of Fusion Bond Epoxy. The color appears redder or more orange depending on the brightness and direction of the light. All tanks are coated inside and out, including nipples and couplings. The coating was tested with samples submerged in biodiesel and un-distilled by-product for a long time. There was no loss of sample weight at the end of the test. The color and surface did not change either. The coating prevents rust and corrosion of components.
Buna-Nitrlle gaskets were custom designed and made to seal the top of the cylinder tank flanges. They are bolted together (10ft lb) and successfully seal the tanks. The tanks use 8 or 12 bolts to hold the gaskets between the flanges.
The processing tank is designed for dewatering WVO, processing WVO with catalyst to make BD, washing biodiesel, drying bio diesel, and condensing distilled methanol from byproduct. This tank has two site glass windows which show the proper level of WVO (40 gallons) for processing and the level of water at the bottom of the biodiesel once it is washed and the BD is ready to be drained. The grey thermostat at the lower left side controls the temperature for dewatering, processing and drying. The valve to the right of the thermostat is for draining the BD after washing. The valve at the conical bottom is for removing the byproduct after processing back to the mixer/distillation tank and removing the soap/water after BD washing. There is a gauge above the thermostat for viewing various temperatures (30 to 240 degrees Fahrenheit). On the back side of the conical bottom is a heater element with an electrical cord for connection to the pump stand. On the center of the cover is a poly tube for connection to a garden hose which controls the misting of water for biodiesel washing. A pressure relief valve is located to the left of the misting coupling. Above the Dynadroit Diesel decal is the QD for connecting a hose from the pump to the tank. On the top right side of the tank is a connector for the copper tube for methanol distillation from the catalyst/distillation tank. The coiled copper tube inside the tank exits at the lower right side of the conical bottom which drains condensed methanol out of the system into a storage tank for methanol for future use
WVO usually contains water and free fatty acid (FFA) as well as leftover food scraps from frying. This tank contains a heating element and a thermostat which will control temperature between 100 and 240 degrees Fahrenheit. This will dewater so a titration can be conducted with the same dewatered WVO that will be processed. The tank cover should be removed for dewatering to ensure that the steam does not condense on the cover and fall back into the WVO. Circulating heated WVO will remove steam pockets which will remove the risk of poor titration to provide an accurate catalyst.
Once the biodiesel processing is completed, the by-product is transferred from the processor tank back to the small tank, the BD can be washed. Washing is used to remove any remaining soap/glycerin. Washing is done by adding misting water through the tank cover. Once the water raises to lower site glass window (lower right side of the tank just above the flange) the biodiesel will be pumped out through the valve below the decal (just above the lower flange.)
Once washing is completed and the BD and soap/water is removed. The misting tube can be used to clean the tank. Once it is dried, the BD can be pumped back into the tank and heat can be used to dry the BD and remove any remaining H2O and methanol.
Both of the conical bottom tanks have a 3/4 inch bronze ball valve with couplings for an air line and a pump hose. The processor tank has two of these valves, one at the bottom of the conical bottom and one just above the lower flange.
The pump hose has a bronze quick disconnect coupling similar to those used on fire fighting hoses. The air line coupling is used for pushing the remaining fluid out of the hose and pump at the end of a fluid transfer.
Using a coated steel tank for catalyst mixing and by-product distillation has several advantages. With a smooth conical bottom, unlike the HDPE tanks, this one will allow better circulation of any liquid and it will be much easier to clean the tanks. The center couplings on each of these tank covers can be used to mist the inside of the tank for cleaning after it is used. This tank holds approximately 25 gallons. It will not need to be modified if the processor tank is enlarged. It has the same valves and hose connectors as the other tank. The site glass window is used for identifying the amount of methanol to be used (22% of 40 gallons = 8.8 gallons of methanol). It has a pressure relief valve and a temperature gauge like the other tanks. The center coupling on the cover is used for collecting steamed methanol and transferring it to the processor tank for condensation. The pressure relief valve can be removed by hand to insert the lye and plugged during distillation,
The heater element in the Mixer/Distillation Tank is run at 150*F to separate the methanol from the by-product. Once there is no more methanol flowing out (about an hour) the heater is shut off and the by-product is drained out and stored in buckets until it is ready for disposal or other usage. The distilled methanol passes through the coil in the processor tank and is cooled and then condensed by water which has been pumped into the processor tank.
When doing by-product distillation, the center coupling on the cover will have a copper tube connected to collect the methanol vapor and transfer it through a cooling tank condense the vapor and drain it into a methanol storage tank.
In order to condense the vaporized methanol, it needs to be transferred through a tank that can cool the tube the vapor is passing through to turn the steam into liquid so it can flow into a storage tank. The processor tank contains a long coiled copper tube from the top to the bottom where it exits thru a bulkhead connector into a clear polyethylene tube which runs into a storage tank. A garden hose is used to run cold water into the tank. Once the distillation is complete the water can be pumped into another tank and be used again for washing or condensation.
The pump can handle 350 degree oil temperature and can also pump the catalyst. The timer is used for safety and for reducing the time needed during each process. The thermostat and pump runs on 110v electrical power. The heater element runs on 220v 30 amps for heating.
The heater elements needs power and control so that each separate process can be controlled correctly. The stand will hold a box that contains the connectors, switches, timers, and thermostat, rely, etc. for controlling the heating element of each tank depending on what process they are conducting. The temperature range should run between 100*F and 212*F depending on what process it is being used for. All plugs are provided except for the one that fits into the shop connector plug for 220V. Heating time depends on which process, ambient temperature, and quality of liquid being heated.