Continuous vacuum dynamic sublimating and condensing machine

Abstract

The invention relates to a continuous vacuum dynamic sublimating and condensing machine, which belongs to the technical field of heat exchange and is suitable for sublimating and refining chemical products with sublimation properties. The continuous vacuum dynamic sublimating and condensing machine is formed by a sublimation gas outlet of a cone on the lower part of a sublimating machine and a horizontal condensing machine together, wherein the sublimating machine is formed by a hot oil heating outer jack and a plurality of hot oil heating flat plates; the outside of the horizontal condensing machine is provided with a semicircular cooling water coil; the inside of the horizontal condensing machine is provided with a plurality of rotary material stirring grooves; a central scraping rotating shaft of the sublimating machine drives a scraping rake to rotate so as to scrape a crude product layer by layer; the crude product is heated to sublimate in vacuum; a sublimation hot gas enters the condensing machine to contact cooled qualified product powder removed by the rotary material stirring grooves; the hot sublimation gas is condensed on the cooled powder; and residues raked layer by layer fall to the bottom of the sublimating machine. A sublimation material is heated uniformly, has short retention time, few side reactions and high yield; the product is condensed on the powder without knocking by a shovel and has good quality; and the heat efficiency of the overall machine and the equipment efficiency are much higher than those of batch-type sublimating and condensing equipment.

Description

Technical field [0001] The invention relates to a continuous vacuum dynamic sublimation and desublimation machine, which belongs to the technical field of heat exchange and is suitable for the sublimation and refining of chemical products with sublimation characteristics. Background technique [0002] At present, the sublimation and desublimation equipment of many industrial products is still quite primitive and backward, and still stays in the state of intermittent sublimation and desublimation. It is a one-time addition of more crude products in the sublimator. The residual layer of non-sublimed impurities in the crude product will accumulate and thicken at the heating bottom of the sublimator, and the thermal resistance will increase with the thickening of the residual layer, so the heating temperature has to be continuously increased as the sublimation proceeds. Some sublimation heat sources have a temperature difference of more than 50 degrees (°C) from the beginning of...

AI Technical Summary

Problems solved by technology

When the crude product contains a lot of impurities, even if the temperature of the heat source is raised very high, it still cannot make up for the increase in thermal resistance, which greatly affects the speed of sublimation

Excessive heating temperature will also increase side reactions and side reaction products, affecting product quality and yield

Sublimation is mostly carried out at higher temperatures, and intermittent operation not only affects equipment efficiency but also reduces thermal efficiency

Because the batch desublimator is a simple partition condenser, the sublimation gas desublimates on the inner wall of the condenser, and the operating conditions of knocking and shoveling the desublimation on the lower wall after parking are very harsh and difficult

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