A device for removing volatile components

Abstract

The invention relates to a device for removing volatile components, comprising a cylindrical tank body, an upper head and a lower head are respectively arranged above and below the tank body; a feed pipe is arranged at the center of the upper head , the inner side of the feed pipe is sleeved with the main air outlet pipe, and one end of the main air outlet pipe extending into the tank is connected to the first evaporation unit, and a second evaporation unit is arranged below the first evaporation unit, so that from top to bottom The angle between the film cloth surface and the horizontal plane on each stage of the evaporation unit gradually increases to maintain the surface renewal speed of the liquid on the film cloth surface, and the temperature of the heating elements below the film cloth surfaces from top to bottom is controlled by the temperature control device The gradual increase is conducive to the discharge of volatile substances, and the full sawtooth weir film distribution system is set to obtain a better film distribution effect.

Description

technical field [0001] The invention relates to a device for removing volatile substances, in particular to a device for removing volatile components in biodiesel. Background technique [0002] As a substitute for traditional petrochemical diesel, biodiesel is a fatty acid ester produced by reacting renewable biomass resource animal and vegetable oil with monohydric alcohol, mainly methanol or ethanol. On the one hand, since the raw material of biodiesel comes from renewable resources, biodiesel itself is renewable, which is of great significance for coping with the crisis of oil resource shortage in the future. On the other hand, almost no Sulfur is present, so the use of bio-tea diesel helps reduce harmful gas emissions. [0003] At present, the main biodiesel preparation process is the transesterification method. During the reaction, in order to promote the reaction of animal and vegetable oils, the amount of monohydric alcohol is excessive. According to the different ca...

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Problems solved by technology

However, in the process of use, it has the following disadvantages: when the liquid to be evaporated enters the tank body and baffles and evaporates from top to bottom, due to the low boiling point substances are gradually removed, the overall viscosity of the material is increased. Therefore, for tanks As for the evaporation surface of the lower part of the tank body, the thickness of the thin layer gradually increases as time goes by, which is unfavorable for the devolatilization. On the other hand, for the material on the evaporation surface of the lower part of the tank body, due to The proportion of volatile substances contained in it is reduced, and it is more difficult to remove volatile substances, which is also unfavorable for volatile substances; in addition, for the entire tank, the vacuum degree of the tank from top to bottom It is declining, which is unfavorable for the devolatilization of the material located on the evaporation cone surface at the bottom of the tank

In addition, since the lower cone surface of the device is connected with the inner wall of the cylinder, it is necessary to set up a corresponding riser pipe on the evaporation surface to realize the removal of gas. A long path can remove the tank body, which reduces the vacuum degree of the tank body. On the other hand, the air riser set on the evaporation surface hinders the flow of liquid on the evaporation surface, which increases the thickness of the liquid on the evaporation surface, resulting in the underside of the evaporation surface. The heat transfer efficiency of the heating element is reduced, which is not conducive to the evaporation of low boiling point substances in the liquid

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