The quartz double-layer jacket flow reaction tube (quartz jacket reaction tube) is a high-end laboratory and pilot consumables designed specifically for precise temperature control and continuous flow chemical reactions. Its core structure consists of an inner reaction channel and an outer constant temperature jacket, allowing the circulation of heat exchange medium (water, oil, or gas), thereby achieving precise control of the temperature of the reactants. This product is particularly suitable for photochemical, pharmaceutical synthesis, catalytic evaluation, and continuous flow processes that require strict constant temperature environments. It is a key component for improving experimental reproducibility and scaling up production reliability.

Frequently Asked Questions (FAQ)

Q1: What are the core advantages of double-layer jacket design compared to single-layer quartz tube?  

A: Single layer tubes can only passively dissipate heat or rely on external bath pots for temperature control, resulting in uneven temperature distribution and slow response in the reaction zone. The double-layer jacket directly surrounds the reaction channel through external circulating bath solution, achieving precise temperature control of ± 0.1 ℃, and can quickly absorb or remove reaction heat, especially suitable for strongly exothermic or temperature sensitive continuous flow reactions.

Q2: Can your company's reaction tube adapt to my existing reaction platform?  

A: Okay. We provide fully customized services - you only need to provide the interface type (such as GL thread, flange, hose connector), jacket inlet and outlet direction, inner/outer diameter, total length, and reaction volume, and we can produce according to the drawing or demand, compatible with the vast majority of microreactors, photochemical reactors, and flow synthesis systems.

Q3: How high pressure and temperature can quartz material withstand?  

A: High quality fused silica is used, the temperature resistance range is -50 ℃ to 1100 ℃ (depending on the joint seal), and the design is normal pressure, but it can withstand the low-pressure reaction within 3-5 bar under the reasonable wall thickness and standard joint. If higher pressure is required, it is recommended to use metal joints and compression ring sealing schemes.

Q4: Is the inner wall easy to clean and will there be any residual substances from the last reaction?  

A: The surface of quartz is extremely smooth and chemically inert, and can be thoroughly cleaned by rinsing with ordinary solvents or ultrasonic cleaning. For viscous materials, we can also provide optional services for hydrophobic coatings on the inner wall, significantly reducing adsorption residue.

Q5: What is the minimum order quantity?  

A: There is no minimum order quantity limit, and one can be customized.

What core customer needs can the product address?

-Inaccurate control: precise temperature control through jacket circulation, bidding farewell to temperature overshoot or local overheating in the reaction vessel.  

-Difficulty in scaling up: From laboratory small-scale testing to pilot scale testing, with the same channel structure design, parameters can be directly transferred.  

-Easy to pollute: High purity quartz has no metal leaching and is suitable for clean processes such as biomedicine and electronic chemicals.  

-Customization: The interface, size, and flow pattern (DC, spiral, static hybrid) are all adjustable, without the need to modify your existing equipment.

Structure and Working Principle

-Inner reaction channel: The material flows continuously in it, which can be set as a straight tube, serpentine or spiral to adjust the residence time and mixing efficiency.  

-Outer jacket layer: connected to the circulating bath pump, the heat transfer medium flows in reverse or parallel to achieve efficient heating or cooling of the reaction solution.  

-Two end sealed interface: optional standard GL14/GL25 thread, KF flange, NPT external thread or customized quick connector, convenient for connecting pipelines and detection components.

Product advantages and user value

Heat transfer: With a thermal conductivity three times higher than ordinary glass, the gap between the jacket can be customized (2-5mm), and the heating and cooling rate can be increased by more than 50%, greatly reducing the experimental period

Optical transparency: UV visible full band transmittance>90%, suitable for photochemical reactions such as photocatalysis and photopolymerization, and can be directly monitored online

Chemical resistance: resistant to almost all media except hydrofluoric acid and hot concentrated phosphoric acid, suitable for strong acids, strong bases, organic solvents, and chlorinated compounds

Customization flexibility: inner diameter of 2mm-50mm, length of 10cm-200cm, jacket single in single out or double in double out, perfectly matching continuous flow processes from micro upgrades to upgrades

Scalability: Multiple sections can be connected in series, or integrated with mirrors and temperature measuring sleeves, making it easy to construct complex reaction sequences with multiple temperature zones and multi-stage feeding

Optional customization options (almost unlimited combinations)

-Geometric shapes: U-shaped, W-shaped, coil shaped, coaxial double tube shaped

-Internal plugins: static mixing element, temperature protection tube, sampling port

-Form of jacket: full jacket, half jacket (only locally temperature controlled), three-way jacket (multiple in and multiple out)

-Surface treatment: inner and outer wall polishing, hydrophobic coating, UV barrier coating

Which applications can solve problems for users?

1. Photocatalytic continuous flow reaction: Ordinary PFA tubes are not resistant to high temperatures and have poor transparency. Quartz jacket tube can withstand high-power LED irradiation and circulate cooling liquid to remove heat effects, preventing catalyst deactivation.  

2. Dangerous exothermic reactions (such as nitrification and chlorination): The jacket quickly removes the heat of reaction to avoid overheating and ensure intrinsic safety.  

3. Low temperature organic metal reaction (below -30 ℃): The outer layer is coated with ethylene glycol/dry ice bath, and the inner layer maintains low viscosity flow to avoid product decomposition.  

4. Biological enzyme catalysis: Precisely control the temperature within ± 0.2 ℃ to maintain enzyme activity and improve conversion rate.  

Customer Application Case (Anonymous)

Case 1: A European pharmaceutical company - Continuous flow amplification of low-temperature lithiation reaction

-Requirement: A quartz jacketed reaction tube with an inner diameter of 6mm and a total length of 1.2m is needed, with a temperature resistance of -40 ° C to 50 ° C, 1/4 inch NPT threads on both ends, and a 10mm hose barb for the jacket interface.  

-Difficulty: The original kettle process involves dropwise addition of butyl lithium at -30 ℃, resulting in intense heat release and a batch yield of only 62%.  

-Our solution: Customize a spiral core quartz jacket tube, which is filled with low-temperature thermal oil (-35 ℃) and has a reaction residence time of 3 minutes.  

-Effect: The yield remained stable at 89% -91%, and the same selectivity was maintained even when enlarged to an inner diameter of 12mm and a length of 1.8m. At present, the customer has purchased 6 sets for different exothermic reactions.  

Case 2: A certain photocatalytic research group - visible light induced ATRP polymerization

-Requirement: A U-shaped quartz jacket tube that is fully transparent to UV visible light and can withstand 80 ℃ and toluene solvent is needed. The jacket tube is used for water cooling and temperature control, and both ends are connected to peristaltic pump tubes (inner diameter 3.2mm).  

-Problem: Local overheating of ordinary glass tubes under blue light irradiation leads to a widening of polymerization dispersion.  

-Our solution: Customize a U-shaped jacket with a gap of 3mm between the jackets, and achieve reverse flow cooling with the inlet at the bottom and the outlet at the top.  

-Effect: The reaction temperature remained stable at 25 ± 0.5 ℃, the polymer molecular weight distribution decreased from 1.8 to 1.2, and the transmittance of the quartz tube decreased by<2% after continuous use for 1000 hours.  

Case 3: A Fine Chemical Enterprise - High Concentration Nitric Acid Oxidation Reaction

-Requirement: Resistant to 98% nitric acid, 80 ℃, inner diameter 10mm, jacket with circulating water to remove reaction heat, requiring easy disassembly and cleaning.  

-Problem: Stainless steel coils are corroded and perforated, while glass coils are not pressure resistant and cannot be temperature controlled.  

-Our solution: Full quartz jacket with PTFE sealing gasket and KF25 quick installation flange.  

-Effect: Running continuously for 6 months without any corrosion marks, and there is no yellow brown scaling on the inner wall (scaling appears on ordinary glass after 2 weeks). The company will replace all four production lines with quartz jacketed pipes in the future.  

Whether you need an experimental grade microtube for validating a new route or a pilot grade jacket for kilogram level production, we can deliver it within a week. We provide drawings or indicate usage scenarios, and we offer free solutions and quotations.  

Luverre Quartz manufactures and sells a wide range of high quality quartz glass, including quartz tubes, quartz plates, quartz rods, quartz windows, quartz crucibles, quartz boats, quartz flanges, quartz beakers, quartz glass instruments, and more. We can meet all kinds of customized requirements for quartz glass products.