CN-121971871-A - Decoloring and purifying device for caproic acid

CN121971871ACN 121971871 ACN121971871 ACN 121971871ACN-121971871-A

Abstract

The invention relates to the technical field of caproic acid purification, in particular to decoloring and purifying equipment for caproic acid. Including the decoloration cauldron, one side of decoloration cauldron is equipped with circulation heater, and the top intercommunication of decoloration cauldron is equipped with the distillation column, and there is one-level condenser on the top of distillation column, and one-level condenser's shell side goes out the liquid end and is connected with vapour and liquid separator, and vapour and liquid separator's play liquid end is connected back flow and discharging pipe respectively through the tee bend, and the upper end intercommunication of decoloration cauldron is equipped with the evaporimeter, and circulation heater's discharge gate communicates to the top of distributing device, and the discharge gate at evaporimeter top communicates with bottom one side of distillation column. The top end of the distillation tower extends upwards out of the first-stage condenser, and a reducing steady flow pipe is communicated between the distillation tower and the first-stage condenser. Compared with the existing caproic acid decoloring and purifying equipment, the invention realizes breakthrough promotion in aspects of mist removal, vacuum stability, material recovery, equipment protection and the like, solves the pain point of the prior art at the core, and remarkably promotes the high efficiency, stability and economy of decoloring and purifying.

Inventors

ZHANG ZHIJUN
ZHANG YONG
ZHAO HONGWU
Zhu Jingtai
CHEN YANYONG
ZHANG MINCHANG
CHEN HAIJIANG
ZHANG JINGYU
WU KUNLING

Assignees

开封市百川汇宝香料有限公司

Dates

Publication Date: 20260505
Application Date: 20260310

Claims (8)

1. The utility model provides a decoloration purification equipment for hexanoic acid, includes decoloration cauldron (1), one side intercommunication of decoloration cauldron (1) is equipped with circulation heater (2), the top intercommunication of decoloration cauldron (1) is equipped with distillation column (3), the top intercommunication of distillation column (3) has one-level condenser (4), the shell side play liquid end of one-level condenser (4) is connected with vapour and liquid separator (5), the play liquid end of vapour and liquid separator (5) is through tee bend connection back flow (51) and discharging pipe (52) respectively, a serial communication port, the upper end intercommunication of decoloration cauldron (1) is equipped with evaporimeter (6), the lower part is equipped with stainless steel ripple silk screen packing in evaporimeter (6), the upper end of stainless steel ripple silk screen packing is equipped with the distributing device, the discharge gate intercommunication of circulation heater (2) is to the top of distributing device, the discharge gate at evaporimeter (6) top and one side intercommunication of the bottom of distillation column (3). The top of the distillation tower (3) stretches out of the first-stage condenser (4) upwards, a variable-diameter flow stabilizing pipe (7) is communicated between the distillation tower (3) and the first-stage condenser (4), the inner diameter of the variable-diameter flow stabilizing pipe (7) is gradually increased from one end close to the distillation tower (3) to the other end, the variable-diameter flow stabilizing pipe (7) gradually inclines downwards from one end close to the distillation tower (3) to the other end, an annular flow stabilizing cavity (71) is arranged in the variable-diameter flow stabilizing pipe (7), a spiral flow blocking passage (72) is arranged on one side, close to the distillation tower (3), of the annular flow stabilizing cavity (71) and is arranged on the inner wall of the variable-diameter flow stabilizing pipe (7) in an integrated structure, one end, close to the first-stage condenser (4), of the variable-diameter flow stabilizing pipe (7) is provided with an arch cover (73), one end, close to the first-stage condenser (4), of the variable-diameter flow stabilizing pipe (7) is provided with a connecting pipe (74), and one side, far from the first-stage condenser (4), of the connecting pipe (74) is provided with a drainage pipe (76). The gas-liquid separator (5) is communicated with the buffer tank (8) through a vacuum tube, and one side of the buffer tank (8) is connected with a vacuum pump (81).
2. The decoloring and purifying device for caproic acid according to claim 1, wherein the bottom surface of the reducing steady flow tube (7) is provided with collecting guide grooves (75) distributed along the axial direction thereof, the tail end of the collecting guide groove (75) is communicated with a drainage tube (76), and the other end of the drainage tube (76) is communicated with the top end side of the distillation column (3).
3. The decoloring and purifying device for caproic acid according to claim 1, wherein the axis of the reducing steady flow tube (7) is inclined downward by 5-15 degrees from the horizontal direction.
4. The decoloring and purifying device for caproic acid according to claim 1, wherein the tail end of the discharging pipe is provided with a receiving tank (9), a deep condenser (91) is communicated between the vapor-liquid separator (5) and the receiving tank (9), a flow control valve and a liquid level meter are arranged between the deep condenser (91) and the vapor-liquid separator (5), and a flowmeter is arranged between the deep condenser (91) and the receiving tank (9).
5. The decolorizing and purifying apparatus for caproic acid according to claim 4, wherein the receiving tank (9) is connected to a vacuum pipe through a pipe, and a valve is provided on the pipe connecting the receiving tank (9) to the vacuum pipe.
6. The decoloring and purifying device for caproic acid according to claim 5, wherein the vapor-liquid separator (5) is connected to a vacuum pipe connected to the buffer tank (8) and a secondary condenser (10) is connected to the vacuum pipe.
7. The decoloring and purifying device for caproic acid according to claim 1, wherein a circulating pump (21) is communicated between the circulating heater (2) and the decoloring kettle (1), and a flow control valve is arranged between the circulating pump (21) and the circulating heater (2).
8. The decolorizing and purifying apparatus for caproic acid according to claim 1, wherein the return pipe (51) is connected to the top side of the distillation column (3), and the return pipe (51) comprises a U-shaped section (511) concavely provided.

Description

Decoloring and purifying device for caproic acid Technical Field The invention relates to the technical field of caproic acid purification, in particular to decoloring and purifying equipment for caproic acid. Background Caproic acid is used as an important organic acid and is widely applied to the fields of food, medicine, chemical industry and the like, and the quality core requirement of the product is that the purity meets the standard and the color number meets the standard. At present, industrial hexanoic acid decolorization and purification mainly adopts a process route of distillation-condensation-separation, and the core depends on the cooperation of a distillation tower and a condenser to realize the separation of pigment and hexanoic acid, but the prior art still has a plurality of difficult-to-solve pain points, and the improvement of product quality and production efficiency is restricted. In the existing caproic acid decoloring and purifying equipment, a distillation tower and a condenser are connected by adopting equal-diameter straight pipelines, a single defoaming structure (such as a common silk screen foam remover) is simply arranged, deep removal of entrainment is difficult to realize, tiny liquid drops containing pigment easily enter the condenser along with steam, and the color number of a finished product exceeds standard and the purity is insufficient. The reflux pipe adopts the straight-through design mostly, can not form effective liquid seal, easily appears system vacuum leakage, pressure fluctuation, destroys the gas-liquid balance in the distillation column, influences rectification stability. In the specific use process, the distillation tower is subjected to severe vaporization, bubble cracking and high-speed air flow wrapping action in the vacuum boiling rectification process, so that a large number of tiny liquid drops containing pigment and heavy impurities, namely entrainment, are generated. The top of the tower is the key part which is most easy to concentrate and difficult to remove because of the highest steam flow rate and the smallest gas-liquid separation space. If effective separation is not carried out, mist can directly enter a condenser and a finished product system, so that the purity of the caproic acid is reduced, the chromaticity exceeds the standard, and the decoloring and purifying effects are seriously affected. If the entrainment rate of the distillation column top is too high, a large number of liquid drops containing pigment and heavy impurities directly enter the primary condenser, so that the chromaticity of the finished caproic acid product exceeds the standard, the decoloring and purifying effects are invalid, an uneven liquid film and a scaling layer are formed on the wall of a heat exchange tube of the condenser, the heat exchange efficiency is reduced, the problems of insufficient gas-liquid separation, out-of-control reflux ratio and the like are caused, and the gas-liquid balance and the operation stability of the rectifying column are destroyed. Under long-term operation, the deposition of impurities can also cause equipment blockage and corrosion aggravation, and seriously affect continuous and stable production of the device. In the prior art, patent with the publication number of CN104941232B discloses a tongue-shaped floating valve tray, entrainment is reduced by a mode that gas horizontally enters a liquid layer, gas-liquid contact time is prolonged, tray efficiency is improved, and the tray can be applied to organic acid distillation and purification scenes. The method belongs to single-dimension defoaming, cannot realize grading defoaming, has poor separation effect on tiny pigment-containing liquid drops with the diameter of 1-10 mu m, is easy to cause entrainment of mist into a condenser, and is difficult to reduce the color number of a finished product to below 20. Disclosure of Invention The invention provides decoloring and purifying equipment for caproic acid, which is used for solving the technical problems that a distillation tower cannot realize grading defoaming in the prior art, tiny pigment-containing liquid drops easily enter a condenser along with steam, so that the color number of a finished product exceeds standard and the purity is insufficient. In order to solve the problems, the decoloring and purifying device for caproic acid provided by the invention adopts the following technical scheme: Including the decoloration cauldron, one side intercommunication of decoloration cauldron is equipped with circulation heater, the top intercommunication of decoloration cauldron is equipped with the distillation column, the top intercommunication of distillation column has one-level condenser, the shell side liquid outlet end of one-level condenser is connected with vapour liquid separator, vapour liquid separator's liquid outlet end is connected back flow and discharging pipe respectively through the tee bend, the upper end inter