Soxhlet Apparatus / Extractor

Product Overview:
The Soxhlet extraction apparatus is a classical laboratory setup designed for continuous solvent extraction of compounds from solid matrices. It enables repeated washing of a sample with fresh solvent, ensuring efficient recovery of target analytes without the need for large solvent volumes.

Key Identifiers:
Common Name: Soxhlet extractor / Soxhlet apparatus
Inventor: Franz von Soxhlet (1879)
Material: Borosilicate glass (heat and chemical resistant)
Configuration: 3-part system (Flask + Extractor + Condenser)
Joint Sizes: Typically 24/29, 29/32
Capacity Range: 50 mL – 1000 mL (flask dependent)

Components & Construction:
a. Boiling Flask (Round-bottom flask)
Holds extraction solvent
Provides uniform heating
b. Soxhlet Extractor Body
Extraction chamber for thimble/sample
Siphon arm for automatic solvent recycling
c. Condenser (Coil/Allihn type)
Circulates cooling water
Condenses solvent vapor back to liquid

Working Principle:
Based on continuous reflux and siphon cycling:
Solvent in flask is heated to boiling
Vapor rises into condenser and liquefies
Condensed solvent drips into extraction chamber
Solvent dissolves target compounds from sample
Chamber fills and automatically siphons back into flask
Cycle repeats until exhaustive extraction is achieved

Applications:
Lipid/fat extraction (e.g., food, oil seeds)
Environmental sample analysis (soil contaminants)
Natural product isolation (plant metabolites)
Polymer and material analysis
Preparation of samples for GC-MS, HPLC
Pharmaceutical raw material extraction

Typical Use Procedure (Concise):
Place dried sample in extraction thimble
Insert into Soxhlet chamber
Add solvent to boiling flask
Assemble apparatus with condenser
Heat under controlled conditions
Allow multiple siphon cycles (6–24 cycles typical)
Recover extract from flask

Technical Specifications (Typical):
Glass Type: Borosilicate (low thermal expansion)
Temperature Range: Up to ~200 °C (dependent on solvent)
Solvent Compatibility: Organic solvents (hexane, petroleum ether, ethanol, etc.)
Cooling Requirement: Continuous water flow for condenser
Extraction Efficiency: High (due to repeated solvent contact)

Advantages:
Exhaustive and reproducible extraction
Efficient solvent recycling
Minimal manual intervention after setup
Standardized method (AOAC, ISO protocols)

Safety & Handling:
Ensure proper water flow in condenser before heating
Avoid dry boiling of solvent
Use heating mantle or regulated hot plate (no open flame for volatile solvents)
Work in a fume hood
Check joints for secure fitting to prevent vapor leaks

Storage & Maintenance:
Clean immediately after use with suitable solvent
Dry all components before storage
Store disassembled to prevent joint sticking
Apply grease lightly to ground joints if required