ECS-KM Double-Jacket Low-Temperature Batch Reactor (-80~150℃, 0.6 MPa, 20 L), EKMDJLTBR

A low-temperature double-jacketed batch reactor (also known as a triple-walled reactor) is designed specifically for cryogenic chemical syntheses, organometallic reactions (such as Grignard formation or lithiation), bio-extractions, and low-temperature crystallizations down to -80℃ or lower. The key feature is the dual-concentric wall architecture: the inner jacket circulates the low-temperature heat-transfer fluid (HTF), while the sealed outer jacket is pulled under high vacuum to act as a thermal insulation barrier.

Double jacket is essential for low-temperature processing due to the following reasons: (1) Elimination of Frost & Condensation: In a standard single-jacketed vessel operating at sub-zero temperatures (e.g., -40 to -80℃), ambient humidity rapidly freezes on the outer glass wall. Heavy frost buildup completely obscures the view inside and creates messy water runoff when thawing. The outer vacuum layer prevents external surface cooling below the ambient dew point. (2) Thermal Efficiency & Temperature Stability: Uninsulated single jacket walls lose significant cooling capacity to the surrounding room air. A vacuum-jacketed outer layer drastically reduces convective and conductive heat gain, keeping thermal stress low and allowing dynamic circulators (chillers) to reach and hold target cryogenic setpoints faster. (3) Operator Safety: The outer wall stays near room temperature even when the inner chamber is at -80℃, preventing cold-contact burns (frostbite) during active sampling or material addition.

References:

1. C. Li, et al., Simultaneous nitrification, denitrification and phosphorus removal in a sequencing batch reactor (SBR) under low temperature, Chemosphere, 2019, 229, 132-141
2. B. Kayranli, et al., Effects of temperature and biomass concentration on the performance of anaerobic sequencing batch reactor treating low strength wastewater, Desalination, 2011, 278, 77-83