In botanical and chemical process equipment, people use extraction tank, vessel, and reactor interchangeably. That creates RFQ confusion:
Suppliers quote different standards and configurations
Buyers receive mismatched designs (wrong ports, agitation, heating, seals, automation)
Projects stall because “a tank” wasn’t defined as a process reactor
This guide explains what each term usually means, how to use the right word in an RFQ, and how to select the right equipment for solid–liquid extraction lines.
If you’re deciding between Soxhlet and a tank-type system, start here: Extraction Tank/Vessel vs Soxhlet: Selection Guide for Buyers
1) What to Call It (Plain-English Definitions)
1.1 “Tank”
A tank usually implies:
storage or simple holding
low pressure (often atmospheric)
limited instrumentation
minimal process functions
In extraction, “tank” can still be correct—if you mean a simple soak/hold tank.
When “tank” is NOT enough: if you need controlled mixing, heating/cooling, reflux, vacuum, solvent recovery integration, or automation, “tank” is too vague.
1.2 “Vessel”
A vessel is a broader engineering term:
a container designed to hold liquid/solid under defined conditions
can include features like nozzles, jackets, coils, insulation, and sanitary finishes
may have agitation and instruments, but not always
“Vessel” is often used when buyers want a more “engineered tank” but don’t want to imply chemical reaction or pressure.
1.3 “Reactor”
A reactor implies a process vessel designed for controlled operation:
agitation designed for mixing/solids suspension
heating/cooling designed for temperature control
defined operating pressure/vacuum
instrumentation and safety interlocks
often designed for repeatability and automation
Even if you’re not doing a chemical reaction, a solvent extraction vessel often behaves like a reactor: temperature control + mixing + solvent handling + safety controls.
2) A Buyer’s Shortcut: Use the “Function List” not the Word
Instead of arguing “tank vs reactor,” define functions. The name becomes obvious.
Function checklist (choose all that apply)
solvent extraction / leaching / soaking
agitation (mixing, solids suspension)
heating and temperature control
cooling / quench
reflux condenser (prevent solvent loss at temperature)
vacuum capability (for lower-temperature boiling or transfer)
inline circulation loop
filtration/transfer integration
solvent recovery integration
automation recipes / data logging
cleaning requirements (manual or CIP)
If you select 4+ boxes, you are no longer buying a “simple tank.” You are buying a process vessel / extraction reactor.
3) How to Choose (By Application)
3.1 Solid–liquid botanical extraction (most common)
If you extract botanicals using ethanol/water:
you typically need agitation + heating/cooling
often need reflux condenser (ethanol evaporation control)
downstream needs concentration + solvent recovery
Most buyers should specify an agitated extraction vessel or extraction reactor, not a “tank.”
3.2 Liquid–liquid extraction or washing steps
If you do phase washing:
mixing must be controllable (emulsions risk)
settling/decanting design matters
ports and sight glasses can be important
Specify: “agitated extraction vessel with controlled mixing + decant/settle capability.”
3.3 Processes under vacuum or pressure
If your extraction step needs:
vacuum to reduce boiling temperature
slight positive pressure for inerting
pressure relief + interlocks
Then “reactor” is usually the right term because safety scope and design codes increase.
4) The Spec Differences That Change Price (and why the word matters)
When a supplier hears “tank,” they may quote:
minimal nozzles
simple top entry
no jacket or basic jacket
basic finish
minimal instruments
When they hear “reactor,” they assume:
engineered agitation
jacket/coil design sized for heating/cooling load
defined vacuum/pressure rating
instruments (T, P, level)
safety devices and interlocks
sometimes explosion-proof options
So choosing the right term prevents “surprise upgrades” later.
5) Selection Table: Tank vs Vessel vs Reactor (What each implies)
| Term | Typical implication | Best used when | What to include to avoid RFQ ambiguity |
|---|---|---|---|
| Tank | storage/holding | solvent storage, buffer tank, receiver | volume, material, connections, venting, level indication |
| Vessel | engineered container | extraction with limited control | jacket/coil, nozzles, finish, basic instrumentation |
| Reactor | controlled process unit | extraction requiring repeatability/safety | agitation design, heat transfer duty, vacuum/pressure rating, interlocks, automation scope |
6) How to Write It in an RFQ (Copy/Paste Templates)
6.1 If you truly mean a simple extraction tank (low control)
“I need a solvent extraction tank for soaking botanical solids, atmospheric operation, manual loading/unloading, basic drain and vent, no automation.”
Add:
volume, material (304/316L)
solvent type
heating yes/no
basic ports
6.2 If you mean a production extraction vessel (most buyers)
“I need an agitated extraction vessel for ethanol/water botanical extraction with jacket heating/cooling, reflux condenser, and transfer to filtration/concentration.”
Add:
batch size (kg solids)
solvent ratio
temperature range
utilities (steam/thermal oil/chiller)
filtration plan and downstream modules
6.3 If you need full process control (reactor-style)
“I need an extraction reactor with engineered agitation for solids suspension, jacket heating/cooling, reflux condenser, vacuum capability, safety interlocks, and recipe control.”
Add:
vacuum level target (if any)
safety scope (explosion-proof region requirements)
documentation needs (PFD/P&ID/FAT)
7) Common Buyer Mistakes (and how to avoid them)
Mistake 1: Asking for “a tank” when you need temperature control
Fix: specify jacket duty and temperature range, not just “heated.”
Mistake 2: Not defining solids handling
Fix: specify solids loading method, basket use, manway size, drain type, and agitation goals.
Mistake 3: Forgetting reflux and vapor control for ethanol
Fix: specify reflux condenser and vapor-tight design (and safety scope).
Mistake 4: Ignoring downstream bottlenecks
Fix: confirm filtration, concentration, and recovery are sized to your batch rhythm.
FAQ (with answers)
1. Is an extraction tank the same as an extraction reactor?
Sometimes, but not always. If you require controlled mixing, heating/cooling, reflux, vacuum, and safety interlocks, it functions like a reactor even if no chemical reaction occurs.
2. Why do suppliers ask different questions depending on the term I use?
Because “tank” implies storage/low control, while “reactor” implies process control, safety rating, and engineered agitation—changing design assumptions and price.
3. What term should I use for ethanol botanical extraction?
Most of the time: agitated extraction vessel or extraction reactor, because ethanol extraction typically needs temperature control, vapor handling (reflux), and safe transfer.
4. If I say “vessel,” will I get a better quote?
Not necessarily “better,” but more aligned—if you include the function list (agitation, jacket duty, reflux, vacuum, etc.). The function list is what prevents mismatched quotes.
5. What’s the fastest way to ensure accurate quotations?
Provide batch size, solvent system, temperature range, solids behavior, required functions (reflux/vacuum), and downstream integration needs.