Membrane scraping device of molecular distiller

Abstract

The invention relates to the technical field of molecular distillation, in particular to a membrane scraping device of a molecular distiller. The membrane scraping device comprises a driving shaft, aconnecting rod and a membrane scraping mechanism, the membrane scraping device is arranged in a distillation cylinder, and the membrane scraping mechanism comprises a flow equalizing plate, an air bagstrip, a positioning plate, a rotating shaft and a bottom plate. One end of the flow equalizing plate is vertically and fixedly connected with one end, close to the inner wall of the distillation cylinder, of the connecting rod, the other end of the flow equalizing plate is vertically downward, and the flow equalizing plate is not in contact with the inner wall of the distillation cylinder, so that mechanical friction between the flow equalizing plate and the inner wall of the distillation cylinder is avoided; a liquid guide groove is formed in the surface, facing the inner wall of the distillation cylinder, of the flow equalizing plate, a certain inclination angle is formed between the liquid guide groove and the movement direction of the flow equalizing plate, and the liquid guide groove can enable a liquid material to forcibly move downwards along the track of the liquid guide groove. Therefore, mechanical friction between the flow equalizing plate and the inner wall of the distillation cylinder is avoided, certain abrasion is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of molecular distillation, in particular to a film wiper of a molecular distillation device. Background technique [0002] Molecular distillation, also known as short-path distillation, is a liquid-liquid separation technology under vacuum conditions. It has the characteristics of low distillation temperature, high vacuum degree, short thermal contact time, and high separation degree. It is especially suitable for high boiling point, heat sensitivity, Separation of easily decomposable substances. The basic principle of molecular distillation is to force the liquid material to form a film on the hot surface through a mechanical device, usually using a rotating scraper. The light components in the material are evaporated by heat, escape from the hot surface, and are captured by the cold surface; The membrane device and the distillate (heavy components) are quickly removed from the hot surface, thereby realizi...

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Problems solved by technology

[0005] Therefore, the present invention is made in view of the above problems. The purpose of the present invention is to solve the problems of uneven film thickness and inconvenient replacement of scrapers.

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