Hot reflux tower for producing carbon-13

Abstract

A hot reflux tower for producing carbon-13 belongs to a chemical reaction device art. The invention discloses a hot reflux tower for producing carbon-13, which mainly comprises the following five parts from above to below: a tower top cover with a calandria liquid distributors, a direct heat exchange-cold liquid leaching tower section filling with structured packing, a decoposing tower section, a cellpacking standing heater tower pot and a tower bottom cap, wherein the heat travels regularly in a shell pass, and the working material runs along a pipe pass. Decomposition products of the hot reflux are carbon dioxide and solution of di-n-butylamine/octane which flows out from the bottom of the tower pot, and the carbon dioxide flows out from the top of the tower top cover. The invention replaces an expensive cellpacking standing gas cooler of the existing technology by the direct heat exchange-cold liquid leaching tower section filling with structured packing, and is provided with a temperature control component for controlling decomposition temperature at 60 +/-5 DEG C., which precision of the control temperature is not +/- 1 DEG C. but +/- 5 DEG C. Accordingly, energy consumption is saved about 20%, in addition to saving the investment cost, and crystallization accident is avoided.

Description

technical field [0001] The invention relates to a hot reflux tower used in the technology of cold and hot reflux carbon dioxide / di-n-butylamine / octane isotope exchange to produce high-concentration carbon-13, and belongs to the field of chemical reaction equipment. Background technique [0002] In the cold and hot reflux carbon dioxide / di-n-butylamine / octane isotope exchange method to produce high-concentration carbon-13, the hot reflux reaction is one of the key technologies. The heat reflux reaction is a process of thermally decomposing the carbamate / octane solution flowing out of the isotope exchange tower in the cascade production system into carbon dioxide and di-n-butylamine / octane solution. The heat reflux tower of prior art is to set up a packed tower section above the shell-and-tube vertical heating kettle, claims the decomposition tower section, and a thermometer is placed on the top of the section, and a shell-and-tube vertical cooler is placed above the decomposi...

AI Technical Summary

Problems solved by technology

The heat reflux tower of prior art is to set up a packed tower section above the shell-and-tube vertical heating kettle, claims the decomposition tower section, and a thermometer is placed on the top of the section, and a shell-and-tube vertical cooler is placed above the decomposition tower section, and the decomposition temperature It needs to be controlled at 70±1°C. Since the temperature control accuracy of ±1°C is not easy to grasp, in the case of the structure of the heat reflux tower, when the operating temperature is slightly higher than the upper limit of the temperature control by 1-2°C, the White crystals appear on the inner wall of the cooler tubes in the decomposition tower section, and in severe cases, the air flow channel is blocked, causing a parking accident

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