Distiller and process of using same to extract fatty acids from vegetable pitch

Abstract

The invention relates to a distiller, which comprises a closed casing, and a heater is arranged in the casing, and the heater includes a plurality of heating pipes, and a water vapor pipe is arranged at the lower end of the heating pipe, and a plurality of nozzles are arranged on the water vapor pipe, each The nozzle extends into the lower opening of a heating tube. The invention also relates to a process for extracting fatty acid from plant asphalt by using the distiller. By setting the water steam pipe, setting the nozzle on the water steam pipe, and inserting the nozzle directly into the heating pipe to inject steam, on the one hand, the water vapor enters the high-temperature asphalt and expands rapidly, pushing the asphalt to rise rapidly in the heating pipe, which improves the The heat exchange rate between the bitumen inside the tube and the heat transfer oil outside the tube reduces the viscosity of the bitumen, which facilitates the escape of fatty acid vapor from the bitumen; The asphalt on the pipe wall is washed down to keep the pipe wall clean, which is good for heat transfer and improves heater efficiency.

Description

Technical field [0001] The invention belongs to the technical field of chemical industry, and particularly relates to a distiller and a process for extracting fatty acids from vegetable pitch by using the distiller. Background technique [0002] Vegetable asphalt is the distillation residue from the production of mixed fatty acids and oleic acid from vegetable oils (including the by-products produced during the refining of edible oils and fats). It is called vegetable asphalt or black foot in the industry. This material is a very viscous black jelly. Mixed fatty acids containing multiple carbon chains, such as palmitic acid, oleic acid, linoleic acid, stearic acid, etc. The content is about 40%. In order to improve the yield of the product, the fatty acid content in the asphalt must be reduced to less than 20% At present, falling film heaters are generally used in the industry to heat asphalt to extract mixed fatty acids. The distillation temperature is about 250°C, but above 240...

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Problems solved by technology

[0002] Vegetable asphalt is the distillation residue of mixed fatty acid and oleic acid produced from vegetable oil (including the by-products of edible oil refining). It is called vegetable asphalt or black foot in the industry. The material is a very viscous black jelly. Mixed fatty acids containing multiple carbon chains, such as palmitic acid, oleic acid, linoleic acid, stearic acid, etc., the content is about 40%. In order to improve the yield of the product, the fatty acid content in the asphalt must be reduced to less than 20%. At present, falling film heaters are generally used in the industry to heat asphalt to extract mixed fatty acids. The distillation temperature is around 250°C, but above 240°C, the linoleic acid in the asphalt is very easy to polymerize into viscose, so reducing the distillation temperature is the first priority However, due to the viscosity of vegetable asphalt and the high boiling point of linoleic acid (including oleic acid, stearic acid, etc.), even if the vacuum residual pressure is less than 2 mm Hg, there are still more mixed fatty acids ( Including linoleic acid, etc.) remain in the viscous asphalt and cannot be evaporated, and the linoleic acid in the asphalt further polymerizes and cokes, making the asphalt unable to flow, thus blocking the heating pipe, making the heater gradually invalid

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