Short path distillation equipment is vacuum separation equipment in which vapor travels only a few centimeters from a heated evaporation surface to a condenser, which lets heat-sensitive compounds be separated at temperatures far below their atmospheric boiling points. That one description covers a two-liter glass kit on a bench and a continuous stainless system running three shifts a day, which is why the phrase is one of the least useful things you can put at the top of an RFQ.
"Short path" describes a distance, not a class of machine: the vapor travels a few centimeters from evaporator to condenser, which is why the same phrase covers a benchtop glass kit and a continuous stainless system with nothing else in common.
We build the second kind. This is a specification guide written by a manufacturer that designs, fabricates, assembles and tests wiped film distillation systems in a vertically integrated Michigan facility — not a product listing, and not a pitch for glassware we do not sell.
What is short path distillation equipment?
Short path distillation equipment separates compounds under vacuum across a vapor path only a few centimeters long. Because the pressure is low and the path is short, the target compounds boil at temperatures their molecules can survive. Edwards Vacuum describes it as a continuous thermal separation process with residence times measured in tens of seconds, compared with hours for conventional batch and circulation distillation — and notes it is applied to high-molecular-weight organics precisely because other methods force heat-sensitive molecules above roughly 200°C, where they break down.
The technique is not new marketing. High-vacuum short-path distillation has a peer-reviewed literature base going back decades, including K.C.D. Hickman's review "High-vacuum Short-path Distillation" in Chemical Reviews. What changed is the equipment attached to the name.
Are short path, molecular, thin film and wiped film distillation the same thing?
They describe the same short vapor path, not the same machine. Thin film, wiped film and rolled film are implementations that raise evaporation rate by mechanically spreading liquid over a large surface rather than by raising temperature.
Here is the thesis of this entire article: short path distillation describes a vapor path, not a product category. Wikipedia's entry on short-path distillation puts it plainly — these systems "have a variety of names depending on the manufacturer," and thin film, wiped film and rolled film are named as modern methods that raise evaporation rate by mechanically spreading liquid over a large surface rather than by raising temperature.
So the search term collapses two very different classes of machine:
- Batch glass apparatus — a boiling flask on a heating mantle, a short path head, a receiving cow and receiving flasks, usually borosilicate 3.3 glass, sometimes a Kugelrohr for very small fractions. Discrete runs, manual control, a few hundred grams at a time.
- Continuous stainless evaporators — thin film, wiped film and rolled film designs in 316L stainless that feed material in and draw distillate and residue out at the same time, with no cycle break.
Both have a short vapor path. Only one of them is a production asset. If you are shopping with the same three words a research chemist uses, you will get quotes that differ by two orders of magnitude and no framework for telling which one belongs on your floor.
Does MACH build short path distillation equipment?
MACH Technologies does not build benchtop glass short path apparatus. We fabricate the continuous stainless wiped film distillation systems that operations move to when a glass still becomes the bottleneck — no glassware line, no Kugelrohr, no bench kit.
MACH WFDS Series wiped film distillation systems are offered in single-stage (WFDS-1S) and dual-stage (WFDS-2S) configurations with evaporator surface areas from 0.15 m² to 0.60 m², and are designed, fabricated, assembled and tested in a single vertically integrated Michigan facility. WFDS-1S is available at 0.15 m², 0.30 m² and 0.40 m²; WFDS-2S at 0.30 m², 0.40 m² and 0.60 m².
Across the range, the systems use touchscreen control of temperature, vacuum, pump speeds and motor settings, precision gear pumps, dual cold trap protection, a quick-lift evaporator for cleaning access, and an integrated remote support module for diagnostics.
What you will not find here is a liters-per-hour figure with our name on it. Throughput on a wiped film system depends on the feedstock, its viscosity, its volatile load and the cut you are targeting, so we quote it per application against your material rather than publishing a number that flatters the datasheet. Surface area is the spec that stays constant. Ask every vendor for both, and ask which feedstock their throughput number assumes. If you want to read a spec sheet critically before the quotes land, start with how to read a wiped film spec sheet before you buy.
How does batch glass short path equipment compare with continuous wiped film?
Both have a short vapor path. Batch glass runs discrete cycles under an operator's attention at a few hundred grams a time; continuous wiped film feeds material in and draws distillate and residue out with no cycle break. Compare them on four axes, not on price.
Comparing a glass kit to a wiped film system on price alone tells you almost nothing. Compare them on the four axes that determine what your finishing line actually produces in a week.
| Decision axis | Batch glass short path | Continuous wiped film |
|---|---|---|
| Realistic run size | A few hundred grams per discrete run on a benchtop kit | No per-batch size: feed in, distillate and residue out simultaneously |
| Throughput | Discrete cycles; setup, teardown and cleaning produce nothing | Continuous feed in, distillate and residue out, no cycle break |
| Thermal exposure | Longer hold at temperature in a static flask | Short residence time on a mechanically spread thin film |
| Labor per liter | Attentive operator for the full length of every run | Setup, monitoring and CIP; operator is not tethered to the run |
| Vacuum requirement | Vacuum depth sets the achievable evaporation temperature; readings are typically taken and logged by hand | Same physics, specified explicitly: verify the level held at the evaporator rather than the pump inlet; WFDS Series uses dual cold trap staging to protect the pump |
| Materials and documentation | Borosilicate 3.3 glass; glass breaks, so replacement flasks and heads become a consumable line item, and hand-logged records are difficult to defend in an audit | 316L stainless; recorded setpoints and logged run data, with quick-lift evaporator access for cleaning |
| Repeatability | Varies with heating profile, vacuum depth and technique | Automated setpoints remove two of those three variables |
| Capital cost | Lowest cost to acquire | Higher acquisition cost, lower cost per liter at volume |
| Scale ceiling | Parallel batch capacity scales labor linearly: every added unit adds a full operator's time, a full cleaning cycle and another line on the schedule | Continuous capacity does not scale labor that way, which is why the cost-per-liter curve crosses |
Axis 1: How many productive hours per shift does each deliver?
The honest throughput question is not "how many liters per batch" but "how many productive hours per shift." A batch still that runs eight hours and needs two more for cooling, teardown and cleaning has a duty cycle, not a capacity. Continuous systems collapse that overhead into a startup and a shutdown.
Axis 2: How does residence time change thermal exposure?
Mechanically spread films raise the evaporation rate by increasing surface area, not by increasing temperature. That is the whole point of the geometry. Less time at temperature means less thermal degradation and less color pickup, which shows up directly in the purity of your fractions.
Axis 3: What does labor per liter look like in practice?
Glass requires an operator watching the run, and glass breaks. As run hours accumulate, replacement flasks and heads become a consumable line item. Stainless shifts the labor from babysitting to scheduled setup, monitoring and cleaning.
Axis 4: Which system can you document for an audit?
This is the axis that decides the purchase for anyone with GMP-style documentation obligations. Manual heating profiles and hand-logged vacuum readings are difficult to defend in an audit. Recorded setpoints and logged run data are not. If documentation is driving the decision, read GMP equipment, documentation, and controls before you specify anything.
When does short path distillation stop being the right answer?
When labor and cycle overhead, rather than equipment cost, cap your output. Short path systems are batch processes with an operator in the loop, so labor hours per liter is usually what ends their viability at production scale.
The named upgrade path is a continuous wiped film system, and the specification you should learn to read first is the one covered in reading a wiped film spec sheet critically.
How do you tell when your glass short path setup has become the bottleneck?
Do not use somebody else's threshold. Competing manufacturers publish a "switch at N liters per hour" figure as a sales instrument, and those numbers are vendor-specific and unverifiable against your material. Run these five checks against your own batch records instead:
- Are you running multiple stills in parallel purely to keep pace with demand?
- Is your cost per liter rising rather than falling as you add units?
- Are you losing batches to thermal degradation or run-to-run inconsistency?
- Do you owe a customer or auditor batch-level documentation you currently reconstruct by hand?
- Is your material valuable enough per liter that a recovery improvement pays back quickly, measured against your own production data?
Three or more yes answers and the still is the constraint.
Why doesn't adding a second batch still solve it?
Adding a second batch still feels like the cheap fix, and for one step it is. But parallel batch capacity scales labor linearly — every additional unit adds a full operator's time, a full cleaning cycle and another line on the schedule. Continuous capacity does not behave that way, which is why the curve crosses.
The other thing worth saying out loud: right-sizing the still almost always moves the bottleneck somewhere else. Once the evaporator is no longer the limit, the constraint usually reappears at the vacuum system, the cold trap duty, the chiller load on the condenser, or the winterization and decarboxylation steps feeding the still. Size the whole finishing line, not the evaporator alone. Our piece on measuring and scaling extraction system throughput walks through the measurement method.
What has to happen upstream before distillation equipment can perform?
No distillation system corrects a bad feed. Purity out is bounded by what goes in, and most disappointing distillation results are upstream problems wearing a distillation costume.
Waxes and lipids carried into the evaporator foul the heated surface and darken the product. Winterization and filtration are what keep them out; hold times, chilling capacity and filter sizing are covered in scaling ethanol winterization ahead of distillation rather than restated here.
Incomplete or inconsistent conversion during decarboxylation shows up downstream as inconsistent fractions and unstable endpoints. If your decarb is a hold step rather than a controlled process, fix that first — see designing a decarboxylation system.
Volatiles are the third one. A dedicated first pass that strips residual solvent and terpenes protects the main separation stage and reduces fouling. That work belongs to the TES Series terpene distillation equipment as a distinct system in the line, not a mode of the WFDS — the approach is described in terpene extraction at scale.
That is also the architectural case for dual-stage. A WFDS-2S dual-stage configuration separates the volatile strip from the main separation inside one integrated system, where WFDS-1S expects that strip to happen elsewhere. Which one you need is a workflow question, not a quality question.
What should you put on a short path distillation equipment RFQ?
Specify evaporator surface area in m², the vacuum level held at the evaporator, materials and cleaning access, and control and data capture — and require every vendor to state the feedstock assumption behind any throughput figure.
What evaporator surface area and configuration should you specify?
Anchor the RFQ on surface area in m² and on your daily production target. Surface area is the variable a manufacturer can hold constant across feedstocks; throughput is not. Require every vendor to state the feedstock assumption behind any throughput figure.
What vacuum level, gauging and cold trap staging should you require?
Vacuum depth sets the achievable evaporation temperature, so the pump, the booster and the leak-tightness of the assembly are part of the separation spec, not accessories. Ask what vacuum level is held at the evaporator, not at the pump inlet, and in which units — torr, microns or mbar — it is being reported. Specify the gauge type that reports the endpoint of record: Pirani gauges drift under solvent and terpene vapor, while capacitance manometers read true regardless of gas composition. Cold trap staging protects the pump from residual volatiles; the WFDS Series uses a dual cold trap arrangement for that reason.
How do materials, seals and cleaning access differ?
316L stainless versus borosilicate glass changes durability, cleaning protocol and what you can document. Ask how long a full clean takes and how many people it needs. Quick-lift evaporator access is a maintenance-hours spec, and maintenance hours are throughput.
What controls, data capture and support should you ask for?
Automated setpoint control of temperature, vacuum, pump speed and motor settings is what makes a run reproducible. Ask what the system logs, whether the log is exportable, and whether the manufacturer offers remote diagnostics, installation and operator training. We offer all three, including an integrated remote support module for diagnostics.
Which compliance marks and classified-area requirements apply to a finishing line?
MACH equipment is built to CE, IECEx, UL 508A, PSI and ASME compliance marks. Compliance marks tell you what a manufacturer had evaluated and against which standard. They are a procurement filter, not a substitute for a room design.
At the principle level: UL 508A addresses industrial control panels, and ASME addresses pressure-retaining components. Those are different questions about different parts of the same skid, and a vendor who answers one when you asked the other is worth a follow-up.
Where distillation sits relative to a classified room depends on your process, your solvent inventory and your building — not on the machine. Distillation is often downstream of the classified area, but that is a determination your fire marshal, electrical engineer and insurer make, and equipment intended for a classified space needs components rated for the classified area it is installed in. Start with which classification your process actually triggers, and if you are designing now, read preparing for NFPA 420 before the drawings are stamped. Your Authority Having Jurisdiction decides, not your equipment vendor.
Frequently asked questions about short path distillation equipment
Is short path distillation the same as molecular distillation?
In practice, yes — the terms are used interchangeably in industry and in vendor literature. "Molecular distillation" emphasizes that vapor reaches the condenser before colliding with other molecules. Both describe the vapor path, not a specific machine.
What is the difference between short path distillation and wiped film distillation?
Wiped film is one way of implementing a short vapor path. Mechanical wipers spread the feed into a thin film across a heated cylinder, increasing evaporation surface area without increasing temperature. A batch glass short path still has a short vapor path but no mechanically spread film and no continuous feed.
Can short path distillation equipment run continuously?
Benchtop glass apparatus runs in batch mode only. Continuous operation is a property of wiped film, thin film and rolled film evaporator designs, which feed material in and draw distillate and residue out simultaneously.
Does MACH publish a liters-per-hour throughput figure?
No. Throughput on a wiped film system depends on the feedstock, its viscosity, its volatile load and the cut being targeted, so MACH quotes it per application against your material. Evaporator surface area is the spec that stays constant.
What evaporator surface areas does the WFDS Series offer?
Evaporator surface areas run from 0.15 m² to 0.60 m². WFDS-1S single-stage is available at 0.15 m², 0.30 m² and 0.40 m²; WFDS-2S dual-stage at 0.30 m², 0.40 m² and 0.60 m².
What size distillation system does a commercial finishing line need?
Size against evaporator surface area and your daily production target, and require the vendor to state the feedstock assumption behind any throughput claim. For most commercial finishing lines the honest answer comes from a sizing review against your actual material and your upstream post-processing and refinement systems — send us your feedstock profile, your target daily volume and your upstream steps, and our engineering team will size the line with you.
MACH Technologies manufactures and sells processing equipment. It does not cultivate, produce, sell, or distribute any botanical end product.
Extraction equipment must be installed, permitted, and operated in accordance with all applicable federal, state, and local fire, building, and electrical codes, including Class I Division 1 requirements where applicable. Consult your Authority Having Jurisdiction (AHJ) before installation.
Throughput, yield, purity, and solvent recovery figures vary with input material, system configuration, and process parameters. Published figures are not a guarantee of results.
Operators are responsible for verifying that their intended use is lawful in their jurisdiction.