Why “price per liter” is misleading
Herbal extraction “machines” can mean:
- a single extraction tank
- a tank + filter skid
- a full line (extraction → separation → concentration → solvent recovery)
So pricing varies mainly because the scope varies. This guide shows the real pricing drivers so you can compare quotes fairly.
If you need a full-system RFQ template: line RFQ checklist
1) Define what you’re actually buying (3 common scopes)
Scope A: Extraction tank only (lowest cost)
Includes: vessel + agitator + heating/cooling + ports
Excludes: filtration, concentration, solvent recovery
Scope B: Extraction skid (mid cost)
Includes: extraction tank + pumps + basic filtration + piping/valves + controls
Scope C: Full extraction line (highest cost)
Includes: extraction + separation + concentration + ethanol recovery + optional drying and CIP
Buyer tip: ask suppliers to list “included/excluded” modules to avoid scope gaps.
Process overview reference: botanical extraction process
2) The biggest pricing drivers (what moves cost the most)
2.1 Capacity and batch rhythm (kg/day drives everything)
Price is driven less by “tank liters” and more by:
- solids per batch (kg)
- batches per day
- extraction time per batch
- downstream cycle times (filtration + recovery)
If you want to shorten cycle time, you’ll often need higher duty hardware (cost increase).
2.2 Solvent type (water vs ethanol)
Ethanol systems usually cost more because they require:
- vapor control (reflux/cooling stability)
- solvent recovery receiver/condenser routing
- stronger safety scope (EX options, grounding, interlocks)
For vapor/cooling basics: cooling design for ethanol extraction
2.3 Heating/cooling architecture (jacket duty, utility availability)
Key cost drivers:
- steam vs hot water availability
- required heat-up time (fast ramp costs more)
- jacket type and media pressure rating
- insulation and temperature stability requirements
2.4 Agitator and torque (common hidden cost)
The agitator can be a major cost swing when you have:
- high solids loading
- viscosity rise during extraction
- need for complete suspension
- low speed / high torque requirements
If you want to avoid overpaying: agitator torque and power spec
2.5 Separation bottleneck (filters/centrifuge sizing)
Many “cheap lines” fail because filtration is undersized or wrong-type.
If clogging is a known risk, expect cost to increase for:
- staged filtration
- better separation equipment
- temperature strategy (warm filter vs cold crash)
Troubleshooting logic: filter clogging causes & fixes
2.6 Concentration and solvent recovery (often the biggest skid cost)
If you need thick extract or solvent reuse, concentration and recovery become major cost drivers:
- evaporation capacity
- vacuum system scope
- condenser and receiver sizing
- cooling utility requirements
(You can keep these as modules rather than “one machine.”)
2.7 Safety scope (EX, interlocks, closed vs open)
Cost increases when you require:
- EX-rated motors/instruments
- explosion-proof enclosures
- more sensors and interlocks
- closed, vapor-tight design with controlled venting
Scope guide: EX scope for ethanol extraction
2.8 Automation and documentation
Automation adds cost but improves repeatability:
- manual → semi-auto → PLC recipes + logging
Documentation adds lead time and cost: - MTC/PMI
- PFD/P&ID
- FAT/SAT packages
3) What affects lead time (not just price)
Common long-lead items:
- high torque gearboxes and seals
- EX electrical components
- custom jackets (especially high pressure half-pipe designs)
- custom nozzle layouts and last-minute changes
- FAT requirements and documentation packages
4) How to compare supplier quotes (what to demand in the quote)
Ask each supplier to state clearly:
- scope included/excluded (tank only vs skid vs full line)
- working volume + headspace basis
- agitation duty and torque
- heat-up target and heating utility assumptions
- filtration capacity and micron strategy
- recovery capacity and condenser basis (if ethanol)
- safety scope and where EX rating applies
- documentation and FAT scope
If you’re requesting a single-tank quote with clear scope, use: extraction tank RFQ/URS template
5) Common “upgrade decisions” that change pricing a lot
Use this list when explaining price changes to your customer:
- 304 → 316L wetted parts + certificates
- basic agitator → high torque solids suspension agitator
- dimple jacket → half-pipe jacket (higher pressure duty)
- open tank → closed/reflux-ready vapor control
- basic bag filter → staged filtration or centrifuge
- no recovery → add vacuum concentration + ethanol recovery receiver
- manual controls → PLC + recipes + data logging
- “no docs” → PFD/P&ID + MTC/PMI + FAT
FAQ (with answers)
Q1: Why is the price range for herbal extraction machines so wide?
Because “machine” can mean tank only, skid, or complete line. Solvent type (ethanol), recovery scope, safety scope, and automation also change cost dramatically.
Q2: What are the top cost drivers for ethanol herbal extraction lines?
Usually: solvent recovery/concentration capacity, safety scope (EX and vapor control), and agitator/jacket duty—plus filtration sizing.
Q3: How can I reduce cost without risking performance?
Define your real needs: throughput rhythm, heat-up target, mixing objective, and safety scope. Avoid over-scoping EX and documentation, but never under-scope mixing, vapor control, and separation.
Q4: Does bigger tank volume always mean higher cost?
Not always proportionally. Agitator torque, jacket duty, and safety/automation can dominate cost more than shell volume.
Q5: What should I send to get an accurate quote quickly?
Material, solvent system, kg/day target, batches/day, temperature limits, filtration requirement, whether you need thick extract, and whether solvent recovery is required.
Want a budgetary cost breakdown for your herbal extraction project?
Send your product form (liquid/paste/powder), solvent system, kg/day target, and whether you need recovery. We’ll outline the modules and the main cost drivers.