Abstract: The present disclosure provides an apparatus and method for producing a policosanol having a specific chromatographic fingerprint. The apparatus of the present disclosure has a feed tank and receiving tanks which are connected to a vacuum system. The method of the present disclosure is carried out by a high vacuum rectification process and includes: firstly, feeding a saponified crude alkanol into a melting tank in which the material is melted and then flows into the feed tank, and then injecting the material into a rectifying still using a delivery pump, followed by first rectification under vacuum condition and sequential collection of fractions at different phases from the tower top and stillage residue from the tower bottom; and after the completion of the rectification of the first batch crude product, carrying out second feeding on the basis of consistent vacuum in the feed tank and the rectifying tower.

Abstract: An interference lens and a projection ambient lamp are provided. The interference lens includes: an interference sheet with a first surface and a second surface opposite to the first surface, the first surface being a rough surface; and a reflective film provided at the interference sheet; wherein light is reflected by the reflective film to form an interference pattern. The projection ambient lamp includes the foregoing interference lens, a light source and a focusing lens; light emitted from the light source passes through the interference lens and is reflected by the reflective film to form an interference pattern, which is focused by the focusing lens and projected on a medium. The present disclosure realizes simplification of the structure by providing a reflective film at the interference lens, hence utilization of light energy is higher, power consumption is lower, manufacturing cost is lower, and projection effect is better.

Abstract: An interference lens and a projection ambient lamp are provided. The interference lens includes: an interference sheet with a first surface and a second surface opposite to the first surface, the first surface being a rough surface; and a reflective film provided at the interference sheet; wherein light is reflected by the reflective film to form an interference pattern. The projection ambient lamp includes the foregoing interference lens, a light source and a focusing lens; light emitted from the light source passes through the interference lens and is reflected by the reflective film to form an interference pattern, which is focused by the focusing lens and projected on a medium. The present disclosure realizes simplification of the structure by providing a reflective film at the interference lens, hence utilization of light energy is higher, power consumption is lower, manufacturing cost is lower, and projection effect is better.