Proprietary pulse purge method - How to reduce residual solvents in your biomass and product

Proprietary pulse purge method - How to reduce residual solvents in your biomass and product

Safety is a hallmark of Delta-9 Technologies extraction systems. One of the most dangerous aspects of liquefied petroleum gas (LPG) or BHO extractions is the residual gasses in the extracted waste biomass and extraction product at the end of a run. Regulations require that operators not empty gas ridden material in a non-classified controlled area. This can be a big burden for operators trying to empty material and move to the next extraction. In most cases operators will empty the biomass in a bin under a well ventilated area until the residual gasses emitted fall below 25% of the lower explosion limit (LEL). The lower explosion limit of LPGs is around 2%.

Delta-9 Technologies has automated this process by passing a sequence of pulsed air through the extracted biomass and through the collection pot. The Delta-9 Technologies MK710 and MK420 are computer controlled and the extent of purging can be precisely replicated with programmed recipes. The pulsed purge starts after the LPG gas has been fully recovered in the gas tank.

Once the system has achieved the conditions set for the final recovery the computer transitions to the pulsed purge mode. The system is pressurized to a set point with compressed air and allowed to equilibrate. The pressure is purged through extraction tubes through the collection pot pneumatic valve and out through an exhaust vent to a safe outside environment. The system is equilibrated to atmospheric pressure and the process repeated with another pulsed purge to ensure very low levels of LPG gas is left in the system. At this point the system is safe to open in normal production environment. The biomass can be disposed of without any further processing. In addition, the oil also has low levels of residuals allowing the operator to move the collection pot into the winterization area. This makes the operators lives easier and the regulators more comfortable. Both of which contribute to more productive working conditions.

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The Delta-9 Technologies system has two LPG sniffers to detect unsafe flammable levels of butane and propane. One is located in the extraction room and the other is located outside the extraction room where the electrical components such as the computer, heaters, chillers, and vacuum pumps are located. In the event that gas is detected the computer will shut down all electrical components. The reason there is a gas sniffer in the computer room is because the vacuum pump could draw LPG into the electrical housing room during initial hard vacuum pull. The gas sniffers and computer are integrated into the exhaust fans, which are activated in the event that LPG is detected above a dangerous threshold.

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