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Gas Drying Apparatus
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Gas Handling · Gas Drying Apparatus

Gas Drying Apparatus

Drying Tube · Wash Bottle · Gas Purification

Gas drying is an essential pre-treatment step in laboratory gas handling — removing moisture to prevent reactions from being affected by humidity or compromising analytical results. This apparatus uses desiccants in a drying tube to absorb moisture from gases. The setup is simple and flexible — use a drying tube alone, or combine it with a wash bottle for integrated washing and drying. Suitable for drying hydrogen, oxygen, carbon dioxide, air, and many other gases — a fundamental configuration for chemical synthesis, catalysis, and analytical testing. Made from borosilicate glass 3.3 — chemically resistant.

Drying Tube / Wash Bottle …Component
Straight, 200mm / 250ml, with frit …Standard Spec
To be confirmedAvailable Joint Sizes
U-shaped tube 250mm With stopcock / 500ml Without frit …Upgrade Options

Specifications are subject to confirmation with your enquiry.

Request a Quote
Borosilicate Glass 3.3 Standard Joint · GB/ISO/ASTM Options Multiple Desiccant Options Integrated Wash + Dry Option

📐 Selection Guidelines: Desiccant selection depends on the target gas and operating conditions — Calcium chloride is most common, suitable for most gases (but not ammonia); Silica gel provides visual indication (turns pink when saturated); Molecular sieves offer deep drying with high efficiency; Soda lime combines drying with acidic gas absorption. Drying tube length should typically be 150-250mm, filled to about 2/3 capacity. For simultaneous washing and drying, place a wash bottle before the drying tube.

  • Desiccant recommendations — calcium chloride, silica gel, molecular sieves, soda lime — matched to your gas
  • Borosilicate Glass 3.3 — chemically resistant, crystal clear
  • Standard joint connections — leak-proof seals
  • Wash bottle option — integrated washing + drying
  • Complete setup — drying tube, wash bottle, stand, all included

BRAND IDENTITY

Vissal® brand wordmark RichTech company logo

Vissal® is RichTech's own brand; RichTech is the company mark. Both are used together for this product's brand identification.

We will follow up on your inquiry as soon as possible. Custom sizes supported Samples available

Specifications

Specifications

Component List

All components listed below are included in this kit. Items marked Optional can be customized.

Request custom specs

Available Joint Sizes · GB/ISO/ASTM Standards

All sizes share 1:10 standard taper — GB, ISO, and ASTM sizes are interchangeable

14/19 19/26 24/29 (GB·recommended) 29/32 34/35 · 45/40 · 50/42 custom
GB (Chinese) 14/19 · 19/26 · 24/29 · 29/32 ISO 14/19 · 19/26 · 24/29 · 29/32 ASTM (American) 14/20 · 19/22 · 24/40 · 29/42

* All components have matching joint sizes for full system compatibility. ASTM and GB/ISO sizes share 1:10 taper — seal lengths differ but are interchangeable.

Component Standard Spec Available Joint Sizes Upgrade Options Qty Link
Please contact us to confirm the available specifications.
📌 Customization Notes:
• Joint size can be selected to match your existing lab system:
 GB (Chinese): 14/19 · 19/26 · 24/29 · 29/32
 ISO: 14/19 · 19/26 · 24/29 · 29/32
 ASTM (American): 14/20 · 19/22 · 24/40 · 29/42
• Drying tube: Straight (standard) or U-shaped
• Wash bottle: With frit (standard) or without frit
• Desiccants available separately (calcium chloride, silica gel, molecular sieves, soda lime, etc.)
• Mix and match — no minimum order quantity
💡 Recommended Add-Ons: Desiccants (as needed) · Glass wool · Stand accessories · Spare tubing

Product Description

I. How Gas Drying Works

Gas drying uses a desiccant to absorb moisture from a gas stream. Desiccants are typically porous solids with numerous micropores on their surface or within their structure — water molecules are adsorbed or chemically bound, and the dried gas exits from the other end.

Three factors affect drying efficiency: desiccant type (adsorption capacity), gas flow rate (too fast reduces contact time), and desiccant quantity (too little reduces capacity). An effective drying apparatus should allow gas to pass slowly and uniformly through the desiccant bed.

✦ Drying Tube vs Wash Bottle:

Drying Tube: Uses solid desiccants to absorb moisture — ideal for drying.
Wash Bottle: Uses liquid absorbents to remove impurities or moisture — ideal for washing + drying.
Best results come from using both in series — wash bottle first to remove acidic gases or soluble impurities, then drying tube to remove residual moisture.

II. What's in the Setup

  • Drying Tube — Core component; straight or U-shaped; holds solid desiccant
  • Wash Bottle — Holds liquid absorbent; washing + drying integration
  • Glass Wool — Prevents desiccant particles from being carried out by gas flow
  • Rubber Stoppers — Seal connections
  • Iron Stand & Universal Clamps — Secure the apparatus
  • Rubber Tubing — Connects components

III. Common Desiccants Comparison

DesiccantSuitable GasesNot Suitable ForRegenerationIndicator
Please contact us to confirm the available specifications.
💡 Quick Tip: For ammonia — avoid calcium chloride and phosphorus pentoxide. For CO₂ and acidic gases — avoid soda lime. When in doubt, silica gel and molecular sieves are the most versatile choices.

IV. Material & Workmanship

The drying tube and wash bottle are made from borosilicate glass 3.3 — chemically resistant and transparent. All ground joints are precision-machined to the standard 1:10 taper, providing reliable seals with rubber stoppers. The drying tube has uniform wall thickness and a smooth inner surface for easy packing and cleaning.

Applications

Typical Applications

Hydrogen Drying

Pre-treatment before reduction reactions — prevents catalyst poisoning

Oxygen Drying

Pre-combustion drying for accurate experiments

CO₂ Drying

Gasification reactions, biological experiments

Air Drying

Dry air for instrument protection, glove box supply

Nitrogen Drying

Pre-treatment before inert gas protection — removes trace moisture

Wash + Dry Series

For gases containing acid fumes or soluble impurities — wash first, then dry

GasRecommended DesiccantNotes
Please contact us to confirm the available specifications.
Operation & Maintenance

User Guide

The keys to gas drying are desiccant packing and gas path sealing. Here's the standard procedure.

03

I. Before You Start

  • Check the drying tube for cracks — cracked glass is unsafe
  • Check rubber stoppers for proper fit and condition
  • Confirm desiccant is within its usable life — indicator silica gel that has turned pink is exhausted
  • Confirm wash bottle liquid is suitable (if using integrated washing)
04

Straight drying tube packing steps

  1. Place a small plug of glass wool at the gas inlet end (about 1-2cm thick)
  2. Add desiccant from the open end, tapping gently to settle the packing
  3. Fill to about 2/3 of the tube length — don't overfill
  4. Place another plug of glass wool on top of the desiccant to prevent particles from being carried out
  5. Insert rubber stoppers at both ends — perforated stoppers for gas connection
05

III. Installation & Connection

  • Secure the packed drying tube on the iron stand
  • Connect the gas inlet to the drying tube via rubber tubing from the gas source
  • Connect the gas outlet to downstream equipment or gas collection via rubber tubing
  • Check gas flow direction — drying tubes often have directional markings
  • For wash + dry series setup: wash bottle first, drying tube second
06

IV. Drying Operation

  • Check airtightness before gas flow — close the outlet and verify pressure holds
  • Gas flow should be not too fast — steady, moderate bubbles indicate the right speed
  • Monitor desiccant condition during drying — indicator silica gel turning pink means it's saturated and needs replacement or regeneration
  • If outlet gas still feels moist, check desiccant quantity, desiccant condition, and gas flow rate
06

V. Shutdown & Maintenance

  • Stop gas flow, turn off the gas source, then disassemble
  • Discard the desiccant — check disposal requirements (some can be regenerated, some cannot)
  • Dispose of wash bottle liquid according to regulations
  • Clean drying tube and wash bottle, dry, and store properly
  • Replace or regenerate desiccant after each use — never reuse exhausted desiccant

📌 Key details for packing:

① Glass wool prevents desiccant particles from being carried into downstream equipment — always use it.
② Overfilling (> 3/4) increases flow resistance and slows gas flow; underfilling (< 1/2) reduces drying capacity.
③ Indicator silica gel should be dried at 120℃ until blue before use if it's already pink.

💡 From a Seasoned Lab Hand:

"Flow rate matters more than desiccant choice" — many focus only on the desiccant type and ignore flow speed. If gas passes through too quickly, even the best desiccant won't work.
Indicator silica gel is the best visual tool — pink means it's time for a change. A pro trick: put a small amount of indicator silica gel at both ends — if the front section turns pink, the main desiccant is nearing exhaustion; if the back section turns pink, the front section has already failed.
Desiccant regeneration: Calcium chloride at 250℃ for 2 hours; silica gel at 120℃ until blue; molecular sieves at 300℃ for 4 hours.
Wash bottle + drying tube order is critical — wash first to remove acidic gases and impurities, then dry to remove moisture. Doing it in reverse (dry first) defeats the purpose.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Desiccant dust is hazardous when inhaled

wear a mask during packing

Check gas flow direction when connecting

reversed flow means no drying

Don't fill wash bottle beyond 2/3 capacity

— prevents suck-back

Pay attention to regeneration temperatures

too high can damage desiccant structure

Do not
  • Never use cracked glassware

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Gas Drying ApparatusComponent Drying Tube / Wash Bottle … Get a Quote