Deacidification and Fraction Recovery System of High Acid Value Vegetable Oil

Abstract

The invention relates to a deacidification and distillate recycling system for vegetable oil with high acid value. The deacidification and distillate recycling system is characterized in that a raw material tank vacuum pumping opening in the top of a vacuum raw material tank is connected with a vacuum pumping system, a raw material oil pipe is connected with a raw material tank spray pipe, a raw material tank oil outlet in the bottom of the vacuum raw material tank is connected with an inlet of a distillation tower oil inlet pipe of a secondary distillation tower by a raw oil pump and a vegetable oil heat exchanger, and a distillation tower oil outlet is connected with a deacidification oil storage tank by a deacidification oil pump and the vegetable oil heat exchanger; a top distillate steam outlet of the secondary distillation tower is connected with a low-boiling-point distillate steam inlet of a condensation recycling machine, a middle distillate steam outlet of the secondary distillation tower is connected with a high-boiling-point distillate steam inlet of the condensation recycling machine, and a recycling machine steam outlet of the condensation recycling machine is connected with the vacuum pumping system. The deacidification and distillate recycling system has the advantages that requirements on acid value of the finished product of the vegetable oil with the high acid value can be met, the system is low in neutral oil loss in deacidification procedures, low-boiling-point distillate and high-boiling-point distillate can be recycled in a classified manner, and investment in follow-up purification can be reduced.

Description

technical field [0001] The invention relates to a high acid value vegetable oil deacidification and fraction recovery system, which belongs to the technical field of vegetable oil processing. Background technique [0002] Deacidification is a very important link in the vegetable oil refining process, and the quality of the deacidification device determines the success or failure of the deacidification process. The method of physical deacidification of high-acid value vegetable oil by means of high-temperature and high-vacuum steam distillation principle does not require chemical deacidification by adding alkali, does not generate waste water, is conducive to protecting the environment, and greatly improves the yield of products (oils), and High value-added by-product fatty acids can be obtained. [0003] In recent years, structured packing has been rapidly popularized due to its simple structure, high steam utilization efficiency, and large gas-liquid specific area. At pres...

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Problems solved by technology

[0003] In recent years, structured packing has been rapidly popularized due to its simple structure, high steam utilization efficiency, and large gas-liquid specific area. At present, most production lines use packed deacidification towers. For oils with high acid value, It is necessary to obtain a very high oil temperature at the inlet of the tower top oil to provide the heat required for the evaporation of all fatty acids. Excessively high oil temperature will lead to the polymerization and decomposition of oil and the increase of trans fatty acids. If the oil inlet temperature is lowered, the packed tower In the lower part, the deacidification effect is reduced due to the decrease of oil temperature, and the deacidification is not complete

Secondly, the oil with high acid value is easy to flash when the oil temperature is too high at the top of the tower. A large amount of fatty acid vapor will lead to the entrainment of neutral oil and product loss, and the by-product fatty acid is not high in purity. In addition, the oil with high acid value is deacidified. The required height of the packing layer is higher than that of general oil deacidification and deodorization. The pressure drop caused by the excessively high packing layer will reduce the vacuum degree at the bottom of the tower, reduce the deacidification capacity, and reduce the acid value of the deacidification and deacidification oil at the bottom of the tower. Difficult to meet process requirements

[0004] For the recovery of distilled fatty acids, single-stage packing traps are generally used to capture the distilled fatty acid vapors by spraying low-temperature fatty acid liquids to obtain mixed fatty acids, which increases the investment in the separation and purification of subsequent by-product fatty acids

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