High-efficiency falling film type rectifier

Abstract

The invention relates to a high-efficiency falling film type rectifier. According to the high-efficiency falling film type rectifier, the lower end of a barrel body is fixedly connected with a lower cover board; a lower separator is placed on the lower cover board; a plurality of falling film type graphite blocks are accumulated and arranged in the barrel body sequentially; a gas liquid mixing chamber is arranged above a gas liquid distribution disc; at least one distribution weir fixedly connected with the gas liquid distribution disc is communicated with the gas liquid mixing chamber; the top end of the gas liquid mixing chamber is fixedly connected with an upper cover board through a graphite cover board; a graphite connecting pipe is fixedly connected to the inside of the upper cover board; a mixed liquid material inlet is formed on the gas liquid mixing chamber; a steam inlet is formed on the upper part of the barrel body; a steam outlet is formed on the lower part of the barrel body; a purified material outlet is formed at the lower end of a lower connecting pipe; and a separated gas outlet is formed at the upper end of the graphite connecting pipe. The high-efficiency falling film type rectifier is characterized in that: at least one rectification weir is arranged on one falling film type graphite block on the middle section of the falling film type graphite blocks accumulated and arranged sequentially; and pipe hole type graphite regular fillers are arranged in vertical holes of the falling film type graphite blocks. The high-efficiency falling film type rectifier has the advantages of reasonable structure, good separation effect, high product purity and the like.

Description

technical field [0001] The invention relates to an alcohol and hydrogen chloride separation device in triethyl phosphate, which is a high-efficiency falling film rectifier. Background technique [0002] The dealcoholization and deacidification device in existing triethyl phosphate, conventional equipment adopts glass-lined reactor, graphite condenser, vacuum unit to complete dealcoholization and deacidification process, and it is different according to the boiling point of triethyl phosphate, ethanol and hydrogen chloride , heating the material in the reaction kettle, the alcohol is heated up and gasified, and hydrogen chloride is released at the same time, and enters the condenser to condense. The disadvantages are that the device has small capacity, high energy consumption, long time and high cost, and the material is in the high-temperature gasification zone for a long time. , The leaked gas is flammable and explosive, and the acid-containing gas stays in the high-tempera...

AI Technical Summary

Problems solved by technology

[0002] The dealcoholization and deacidification device in existing triethyl phosphate, conventional equipment adopts glass-lined reactor, graphite condenser, vacuum unit to complete dealcoholization and deacidification process, and it is different according to the boiling point of triethyl phosphate, ethanol and hydrogen chloride , heating the material in the reaction kettle, the alcohol is heated up and gasified, and hydrogen chloride is released at the same time, and enters the condenser to condense. The disadvantages are that the device has small capacity, high energy consumption, long time and high cost, and the material is in the high-temperature gasification zone for a long time. , the leaked gas is flammable and explosive, and the acid-containing gas stays in the high-temperature area for a long time, which has a high damage rate to the equipment and a low service life of the equipment, which poses a safety hazard

[0003] The other is the tower type evaporator that adopts the tower type dealcoholization and deacidification process and the tower type dealcoholization and deacidification process has a large area and high equipment height. It is necessary to build a 22-meter-high production plant, because the vertical feeding evaporator needs Increase the vapor pressure and increase the temperature, and the gasification temperature is low during negative pressure production. Once the power failure occurs, the material in the evaporation tower will form a normal pressure, the material will heat up rapidly, and the alcohol gas will form a positive pressure, which poses a safety hazard.

In the later stage, the height of the equipment is reduced, and only a 12-meter-high production plant is required. The tube-and-tube falling film evaporator is used instead of glass for reaction heating, which does not meet the high-purity dealcoholization and deacidification process requirements. The disadvantage is that the resin and graphite The volume expansion coefficient is inconsistent, so the bonding equipment cannot be too long at high temperature, and the process condition required in the production process is that the material must complete the dealcoholization and deacidification tasks in a certain process

Due to the design structure, the control conditions of the equipment are poor, and the efficiency of dealcoholization and deacidification is low. The distribution weir made of graphite is made of impregnated graphite straight pipes, and the straight pipes are connected with the distribution plate by screws. Film effect, its film formation rate is low, degassing is not ideal

The above two methods cannot completely remove ethanol and hydrogen chloride in triethyl phosphate

[0004] China Invention Patent Application No.: 201110191858.7 discloses the invention patent application for "A High Efficiency Falling Film Evaporation Reboiler" proposed by the inventor. This high efficiency falling film evaporation reboiler overcomes the shortcomings of the above two process devices and makes the equipment Low height, small footprint, low cost, high separation efficiency and good effect compared with existing process devices, energy saving and environmental protection, simple operation, low use pressure, high safety performance, etc., but due to the use of thin film evaporation absorption block The structure in which the body directly communicates with the porous evaporating reboiler block through the distribution cone, only the first-stage thin film evaporation is formed by setting the distribution weir on the thin film evaporation absorption block, and there is no rectification weir on the porous evaporating reboiler block The formed two-stage thin-film evaporation, and the rectification weir as the two-stage thin-film evaporation is the key performance part connecting the preceding and the following. Therefore, the lack of rectification process affects the separation efficiency, and the purity of the product is not yet ideal.

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