CN106365996B - Water washing process of isooctyl acrylate esterifying liquid - Google Patents
Water washing process of isooctyl acrylate esterifying liquid Download PDFInfo
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- CN106365996B CN106365996B CN201610641005.1A CN201610641005A CN106365996B CN 106365996 B CN106365996 B CN 106365996B CN 201610641005 A CN201610641005 A CN 201610641005A CN 106365996 B CN106365996 B CN 106365996B
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/58—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/60—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/62—Use of additives, e.g. for stabilisation
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Abstract
The invention provides a washing process of isooctyl acrylate esterification liquid, which is characterized in that acrylic acid is directly esterified by allyl alcohol in the presence of at least one acrylic acid stabilizer, the esterification is catalyzed by sulfuric acid, and the obtained crude reaction mixture B1 contains isooctyl acrylate, allyl alcohol, acrylic acid, isooctyl acid sulfate, trace sulfuric acid and common impurities. The washing process of the isooctyl acrylate esterification solution has the advantages that: the design is ingenious, the method is reasonable, the product quality is improved, and the consumption is reduced.
Description
Technical Field
The invention relates to the field of production of isooctyl acrylate, in particular to a washing process of isooctyl acrylate esterified liquid.
Background
In the prior isooctyl acrylate production process, neutralization reaction is carried out after esterification reaction, and a direct washing process after esterification is not adopted, so that the product quality is low, the consumption is high, and the production requirement can not be met. In the prior water washing tower, the raw materials are conveyed into the tower body, and the cleaning solution is conveyed into the tower body to carry out cleaning reaction and the like on the raw materials, so that the water washing effect is poor, the consumed time is long, and the working efficiency is low. The observation mirror is not designed on the tower body of the washing tower, the observation mirror with single design can not effectively observe the internal working condition of the tower body, the production requirement can not be met, and the observation mirror can be sealed by effectively ensuring, so that the safety is ensured. The distributor of the previous washing tower is fixedly arranged inside the washing tower, and the washing needs to be carried out through a manhole, so that the washing operation is very troublesome, the washing effect is not good, the distributor is difficult to clean, and the distributor is also inconvenient to maintain if damaged. The space at the top of the conventional water washing tower is small, gas and liquid are not easy to separate, and the gas discharged from the upper end of the water washing tower contains liquid, so that the production is not facilitated.
Disclosure of Invention
In order to solve the problems, the invention provides a washing process of isooctyl acrylate esterified liquid, which has the advantages of ingenious design, reasonable method, improved product quality and reduced consumption.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
a process for washing the esterified liquid of isooctyl acrylate with water includes such steps as esterifying acrylic acid directly by isooctyl alcohol in the presence of at least one acrylic acid stabilizer, catalyzing by sulfuric acid to obtain crude reaction mixture B1 containing isooctyl acrylate, isooctyl alcohol, acrylic acid, isooctyl acid sulfate, trace sulfuric acid and general impurities, loading the mixture B1 in washing tower, and washing with water at the flow ratio of mixture B1 to washing liquid of 1: controlling the flow rate at 0.1-1: 100, and after 20-40 min, discharging washed isooctyl acrylate from a discharge hole of a washing tower; this makes it possible to obtain an organic phase O2 at the top of the column, an aqueous phase A1 at the bottom,
the organic phase O2 is sent to a head-cut removal column C3, so that acrylic acid and isooctyl alcohol contained in the organic phase O2 are obtained at the top, which are recycled to the esterification reaction, and the isooctyl acrylate, from which the head is removed, is sent to a second distillation column C4, which purifies it from the heavy products, flowing out at the top; and
-the aqueous phase a1 is sent to the stage of hydrolysis of isooctyl acid sulfate present in said aqueous phase a1, to be hydrolyzed, in order to produce isooctyl alcohol and sulfuric acid in said phase, the acidic species resulting from said hydrolysis being neutralized in this medium by addition of a base, the resulting aqueous phase A3 is sent to the stage of recovery of isooctyl alcohol in the distillation column C1, said alcohol being taken off at the top of said column C1.
The water washing liquid is a mixed liquid of water and an organic solvent, and the mass ratio of the water to the organic solvent is 1: 0.1-1: 100; the organic solvent is one or more of methanol, ethanol, diethyl ether, toluene, cyclohexane, p-toluene, ethyl acetate and glycerol.
The acrylic stabilizer is selected from the group consisting of Fe, Mn and Cu metal salts, 2, 2, 6, 6-tetramethyl-1-piperidinyloxy (TEMPO), 4-hydroxy-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-hydroxy-TEMPO), 4-methoxy-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-methoxy-TEMPO) and 4-oxo-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-oxo-TEMPO).
The washing tower comprises a tower body, a distributor and a standing device, wherein the distributor is respectively arranged at the upper part, the middle part and the lower part of the tower body, the lower end of the tower body is connected with the distributor at the lower part through a pipeline A, a conveying pump is arranged on the pipeline A between the conveying pump and the distributor at the lower part, the distributor at the upper part and the distributor at the lower part are respectively connected with a water inlet main pipeline through pipelines, the outlet end of the conveying pump is also connected with a pipeline between the middle distributor and the water inlet main pipeline through a pipeline B, a second valve is designed on the pipeline B at the outlet end of the conveying pump, and a check valve is arranged on a connecting pipeline between the pipeline B and the water inlet main pipeline; a pipeline mixer is arranged on a pipeline between the one-way valve and the tower body, the outlet of the pipeline mixer is connected to the tower body, a first inlet pipe of the pipeline mixer is connected with the one-way valve, and a second inlet pipe of the pipeline mixer is connected with a pipeline B; the middle position of the tower body is connected with a feed pipe, and the bottom of the tower body is provided with a discharge pipe; a discharge pipe at the lower end of the tower body and a pipeline between the delivery pump and the tower body share a section of pipeline C, and the section of pipeline C is provided with an online pH value measuring mechanism; the standing device is designed and installed at the upper end of the tower body and comprises a transition cone and a cylindrical barrel body, the thin opening end of the transition cone is connected with the upper end of the tower body through a flange, the thick opening end of the transition cone is connected with the lower end of the cylindrical barrel body, one side of the upper end of the cylindrical barrel body is connected with a gas outlet pipe, and the diameter of the cylindrical barrel body is 1.2-3 times of that of the tower body; the outer side of the cylindrical barrel body is provided with a sight glass, the sight glass comprises an upper sight glass, a middle sight glass and a lower sight glass, the lower end of the upper sight glass is overlapped with the upper end of the middle sight glass, and the upper end of the lower sight glass is overlapped with the lower end of the middle sight glass; the upper part and the lower part of the tower body are respectively provided with a sight glass, the sight glass comprises an upper sight glass and a lower sight glass, and the lower end of the upper sight glass and the upper end of the lower sight glass are superposed;
the pipeline mixer comprises a mixing main body, a first inlet pipe, a second inlet pipe, a mixture outlet pipe and a washing tower, wherein one end of the mixing main body is connected with the first inlet pipe, the other end of the mixing main body is connected with the mixture outlet pipe, one side of the mixing main body is connected with the second inlet pipe, the second inlet pipe extends into the mixing main body, the end part of the second inlet pipe is vertically connected with a flow dividing pipe, the port part of the flow dividing pipe is in a sealing design, a plurality of fine holes are designed around the pipe wall of the flow dividing pipe, and the outlet end of the mixture outlet pipe;
the distributor comprises a liquid inlet pipe, a transverse pipe, transition pipes, distribution pipes, sleeve joints and a washing tower, wherein one end of the liquid inlet pipe is connected with the middle of one end of the transverse pipe through the flange joints, the other end of the transverse pipe is connected with one end of one transition pipe through a plurality of flange joints, the other end of each transition pipe is connected with one end of the corresponding transition pipe, the sleeve joints are provided with a plurality of distribution pipes and are arranged on the outer side of the washing tower, the distribution pipes extend into the washing tower from the sleeve joints, the other ends of the transition pipes are connected with the sleeve joints through the flange joints, the port parts of the distribution pipes are sealed, and a plurality of fine holes;
the sight glass include lens, bolt, nut, gland, base, the lens is designed into the strip lens, gland and base design rectangle form and centre all open and have rectangular form window, open in the middle of the base window outside has the step, open in the middle of the gland window inboard has the step, the lens dress is equipped with sealed the pad between the step of base and the step of gland and between lens and base and the gland, the gland both sides are passed through the bolt and the nut and are fixed on the base, the base welds all around on the tower body or on the cylinder staving.
The invention has the advantages of ingenious design, reasonable method, improved product quality and reduced consumption; the middle circulating system and the bottom circulating system are added in the washing tower, so that the washing effect is improved, and the product quality is improved; the structure design of the sight glass is reasonable, the use safety and reliability of the equipment are ensured, and the arrangement structure design of the sight glass can effectively observe the internal condition of the equipment; the distribution pipe can be drawn out from the washing tower, so that the washing is convenient, and the disassembly, assembly and maintenance are convenient; the design of the standing device solves the problem that gas and liquid are not easy to separate, and the gas-liquid separation effect is improved; the structural design of the pipeline mixer ensures that two different raw materials are mixed and reacted in advance, saves mixing time and improves working efficiency.
Drawings
FIG. 1 is a schematic diagram of a water wash column of the present invention.
FIG. 2 is a schematic diagram of a distributor of the water wash column of the present invention.
FIG. 3 is a schematic view of a line mixer of the water wash column of the present invention.
FIG. 4 is a schematic view of a sight glass of the water washing tower of the present invention.
Detailed Description
Referring to the drawings, the process for washing the isooctyl acrylate esterification liquid, which is the direct esterification of acrylic acid with isooctyl alcohol in the presence of at least one acrylic acid stabilizer, the esterification being catalyzed by sulfuric acid, gives a crude reaction mixture B1 containing isooctyl acrylate, isooctyl alcohol, acrylic acid, isooctyl acid sulfate, traces of sulfuric acid and general impurities, and gives a mixture B1 which is placed in a washing column at a flow ratio of mixture B1 to washing liquid of 1: controlling the flow rate at 0.1-1: 100, and after 20-40 min, discharging washed isooctyl acrylate from a discharge hole of a washing tower; this makes it possible to obtain an organic phase O2 at the top of the column, an aqueous phase A1 at the bottom,
the organic phase O2 is sent to a head-cut removal column C3, so that acrylic acid and isooctyl alcohol contained in the organic phase O2 are obtained at the top, which are recycled to the esterification reaction, and the isooctyl acrylate, from which the head is removed, is sent to a second distillation column C4, which purifies it from the heavy products, flowing out at the top; and
-the aqueous phase a1 is sent to the stage of hydrolysis of isooctyl acid sulfate present in said aqueous phase a1, to be hydrolyzed, in order to produce isooctyl alcohol and sulfuric acid in said phase, the acidic species resulting from said hydrolysis being neutralized in this medium by addition of a base, the resulting aqueous phase A3 is sent to the stage of recovery of isooctyl alcohol in the distillation column C1, said alcohol being taken off at the top of said column C1.
The water washing liquid is a mixed liquid of water and an organic solvent, and the mass ratio of the water to the organic solvent is 1: 0.1-1: 100; the organic solvent is one or more of methanol, ethanol, diethyl ether, toluene, cyclohexane, p-toluene, ethyl acetate and glycerol.
The acrylic stabilizer is selected from the group consisting of Fe, Mn and Cu metal salts, 2, 2, 6, 6-tetramethyl-1-piperidinyloxy (TEMPO), 4-hydroxy-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-hydroxy-TEMPO), 4-methoxy-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-methoxy-TEMPO) and 4-oxo-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-oxo-TEMPO).
FIG. 1 shows a water washing tower, which comprises a tower body 1, a viewing mirror 4, a standing device 2 and a distributor 5, wherein the standing device 2 is designed and installed at the upper end of the tower body 1, the standing device 2 comprises a transition cone 21 and a cylindrical barrel body 22, the thin end of the transition cone 21 is connected with the upper end of the tower body 1 through a flange, the thick end of the transition cone 21 is connected with the lower end of the cylindrical barrel body 22, one side of the upper end of the cylindrical barrel body 22 is connected with a gas outlet pipe 3, and the diameter of the cylindrical barrel body 22 is 1.2-3 times of that of the tower body; the outside of the cylindrical barrel body 22 is provided with a viewing mirror 4, the viewing mirror 4 comprises an upper viewing mirror, a middle viewing mirror and a lower viewing mirror, the lower end of the upper viewing mirror is overlapped with the upper end of the middle viewing mirror, and the upper end of the lower viewing mirror is overlapped with the lower end of the middle viewing mirror; the upper part and the lower part of the tower body 1 are respectively provided with a sight glass 4, the sight glass 4 comprises an upper sight glass and a lower sight glass, and the lower end of the upper sight glass is superposed with the upper end of the lower sight glass; the distributor 5 is respectively arranged at the upper part, the middle part and the lower part of the tower body 1, the lower end of the tower body 1 is connected with the distributor 5 at the lower part through a pipeline A6, a delivery pump 7 is arranged on a pipeline A6 between the delivery pump 7 and the distributor 5 at the lower part, the upper distributor and the lower distributor are respectively connected with a water inlet main pipeline 8 through pipelines, the outlet end of the delivery pump 7 is also connected with the pipeline between the middle distributor and the water inlet main pipeline 8 through a pipeline B9, a second valve is designed on a pipeline B9 at the outlet end of the delivery pump 7, and a check valve 10 is arranged on a connecting pipeline between a pipeline B9 and the water inlet main pipeline 8; a pipeline mixer 11 is arranged on a pipeline between the check valve 10 and the tower body 1, the outlet of the pipeline mixer 11 is connected to the tower body 1, a first inlet pipe 112 of the pipeline mixer 11 is connected with the check valve 10, and a second inlet pipe 113 of the pipeline mixer 11 is connected with a pipeline B9. The middle position of the tower body 1 is connected with a feed pipe 13, and the bottom of the tower body is provided with a discharge pipe 12; a discharge pipe 12 at the lower end of the tower body 1 and a pipeline between the delivery pump 7 and the tower body 1 share a section of pipeline C, and an online pH value measuring mechanism 14 is arranged on the section of pipeline C.
Fig. 3, the pipe mixer 11 includes a mixing main body 111, a first inlet pipe 112, a second inlet pipe 113, and a mixture outlet pipe 114, one end of the mixing main body 111 is connected to the first inlet pipe 112, the other end of the mixing main body 111 is connected to the mixture outlet pipe 114, one side of the mixing main body 111 is connected to the second inlet pipe 113, the second inlet pipe 113 extends into the mixing main body 1, the end of the second inlet pipe 112 is vertically connected to a diversion pipe 116, the end of the diversion pipe 116 is of a sealed design, a plurality of pores 117 are designed around the wall of the diversion pipe 116, and the outlet end of the mixture outlet pipe 114 is connected to the washing tower 1.
Fig. 2, distributor 5 includes feed liquor pipe 51, violently pipe 52, transition pipe 53, distribution pipe 54, casing joint 55 and rinsing tower 56, feed liquor pipe 51 one end is passed through flange joint and is connected in the middle of violently pipe 52 one end, violently pipe 52 other end is through the one end of a transition pipe 53 of a plurality of flange joint and each flange joint connection, distribution pipe 54 is connected to the transition pipe 53 other end, casing joint 55 design has a plurality of and installs in the rinsing tower 56 outside, distribution pipe 54 stretches into in rinsing tower 56 and the other end of transition pipe 53 passes through flange joint adapter sleeve 55 from casing joint 55, distribution pipe 54's port portion is sealed, distribution pipe 54 pipe wall all around design has a plurality of pore 57.
Fig. 4, the viewing mirror 4 includes a lens 41, a bolt 42, a nut 43, a pressing cover 44, and a base 45, the lens 41 is designed as a strip lens, the pressing cover 44 and the base 45 are designed as a rectangular shape, and a strip window is opened in the middle of the rectangular shape, a step is opened outside the window in the middle of the base 45, a step is opened inside the window in the middle of the pressing cover 44, the lens 41 is installed between the step of the base 45 and the step of the pressing cover 44, and a sealing pad 46 is installed between the lens 41 and the base 45 and the pressing cover 44, two sides of the pressing cover 44 are fixed on the base 45 through the bolt 42 and the nut 43, and the base 45 is.
When the device is used, raw materials enter from the middle of the tower body, cleaning solution is input from the water inlet main pipe, the circulating pump circulates the solution at the bottom of the tower, one path of the circulating pump is circularly conveyed to the lower distributor, the other path of the circulating pump is circularly conveyed to the middle distributor, good reaction of the raw materials and the cleaning solution is facilitated, generated gas and oil phase rise and enter the standing device, the sudden space of the standing device is enlarged to play a role in buffering, the flow rate of the gas and the oil phase is reduced, and oil phase and gas separation is facilitated; a worker can observe the internal working condition of the washing tower through a strip interface sight glass, in order to prevent the strength of the tower body from being reduced due to the opening on the surface of the tower body, the sight glass is designed to be sectional, the connecting part is designed to be overlapped, the situation that the inside of the tower cannot be observed is avoided, the sight glass is easy to damage due to overlong sight glass, and the sight glass designed by the method is safe and reliable; the transition pipe and the distribution pipe are designed into a whole, the distribution pipe extends into the washing tower from the interior of the sleeve joint, one end of the transition pipe is hermetically connected with the sleeve joint, the other end of the transition pipe is hermetically connected with the transverse pipe, the other end of the transverse pipe is hermetically connected with the liquid inlet pipe, the solution is conveyed into the transverse pipe from the liquid inlet pipe, the transverse pipe is redistributed into each distribution pipe, the solution is sprayed out to the periphery by the pores in the distribution pipes to be uniformly distributed, when the washing or maintenance is needed, the transverse pipe is only required to be detached, the transition pipe is connected with the sleeve joint and detached, and the distribution pipe can be drawn out from the sleeve joint to be washed or maintained; raw materials enter the tower body from the middle of the tower body, cleaning solution is input from a water inlet main pipe, a conveying pump circulates solution at the bottom of the tower body, good reaction of the raw materials and the cleaning solution is facilitated, generated gas and oil phase rise to enter a standing device, the sudden space of the standing device is enlarged to play a role in buffering, the flow rate of the gas and the oil phase is reduced, and oil phase and gas separation is facilitated; first import pipe carries in acid material expects the main part of mixing, and the second import pipe carries alkaline material to the shunt tubes, and in the shunt tubes passed through a plurality of pore dispersions main part of mixing again alkaline material, two kinds of materials carried out the mixing reaction, and the reaction is carried in the washing tower while mixing, has just so saved the time of mixing reaction for reaction efficiency improves work efficiency.
Claims (2)
1. A process for washing the esterified liquid of isooctyl acrylate with water, which comprises esterifying acrylic acid directly with isooctyl alcohol in the presence of at least one acrylic acid stabilizer, the esterification being catalyzed by sulfuric acid, to obtain a crude reaction mixture B1 containing isooctyl acrylate, isooctyl alcohol, acrylic acid, isooctyl acid sulfate, trace amounts of sulfuric acid and general impurities, characterized in that the obtained mixture B1 is placed in a washing column, and the ratio of the flow rate of mixture B1 to the washing liquid is 1: controlling the flow rate at 0.1-1: 100, and after 20-40 min, discharging washed isooctyl acrylate from a discharge hole of a washing tower; this makes it possible to obtain an organic phase O2 at the top of the column, an aqueous phase A1 at the bottom,
the organic phase O2 is sent to a head-cut removal column C3, so that acrylic acid and isooctyl alcohol contained in the organic phase O2 are obtained at the top, which are recycled to the esterification reaction, and the isooctyl acrylate, from which the head is removed, is sent to a second distillation column C4, which purifies it from the heavy products, flowing out at the top; and
-the aqueous phase a1 is sent to the hydrolysis step of isooctyl acid sulfate present in said aqueous phase a1, to be hydrolyzed, in order to generate isooctanol and sulfuric acid in said aqueous phase a1, the acidic species obtained from said hydrolysis are neutralized by addition of a base, the aqueous phase A3 obtained is sent to the isooctanol recovery step in a distillation column C1, said isooctanol being taken off at the top of said column C1;
the water washing liquid is a mixed liquid of water and an organic solvent, and the mass ratio of the water to the organic solvent is 1: 0.1-1: 100; the organic solvent is one or more of methanol, ethanol, diethyl ether, toluene, cyclohexane, ethyl acetate and glycerol;
the washing tower comprises a tower body, a distributor and a standing device, wherein the distributor is respectively arranged at the upper part, the middle part and the lower part of the tower body, the lower end of the tower body is connected with the distributor at the lower part through a pipeline A, a conveying pump is arranged on the pipeline A between the conveying pump and the distributor at the lower part, the distributor at the upper part and the distributor at the lower part are respectively connected with a water inlet main pipeline through pipelines, the outlet end of the conveying pump is also connected with a pipeline between the middle distributor and the water inlet main pipeline through a pipeline B, a second valve is designed on the pipeline B at the outlet end of the conveying pump, and a check valve is arranged on a connecting pipeline between the pipeline B and the water inlet main pipeline; a pipeline mixer is arranged on a pipeline between the one-way valve and the tower body, the outlet of the pipeline mixer is connected to the tower body, a first inlet pipe of the pipeline mixer is connected with the one-way valve, and a second inlet pipe of the pipeline mixer is connected with a pipeline B; the middle position of the tower body is connected with a feed pipe, and the bottom of the tower body is provided with a discharge pipe; a discharge pipe at the lower end of the tower body and a pipeline between the delivery pump and the tower body share a section of pipeline C, and the section of pipeline C is provided with an online pH value measuring mechanism; the standing device is designed and installed at the upper end of the tower body and comprises a transition cone and a cylindrical barrel body, the thin opening end of the transition cone is connected with the upper end of the tower body through a flange, the thick opening end of the transition cone is connected with the lower end of the cylindrical barrel body, one side of the upper end of the cylindrical barrel body is connected with a gas outlet pipe, and the diameter of the cylindrical barrel body is 1.2-3 times of that of the tower body; the outer side of the cylindrical barrel body is provided with a sight glass, the sight glass comprises an upper sight glass, a middle sight glass and a lower sight glass, the lower end of the upper sight glass is overlapped with the upper end of the middle sight glass, and the upper end of the lower sight glass is overlapped with the lower end of the middle sight glass; the upper part and the lower part of the tower body are respectively provided with a sight glass, the sight glass comprises an upper sight glass and a lower sight glass, and the lower end of the upper sight glass and the upper end of the lower sight glass are superposed;
the pipeline mixer comprises a mixing main body, a first inlet pipe, a second inlet pipe, a mixture outlet pipe and a washing tower, wherein one end of the mixing main body is connected with the first inlet pipe, the other end of the mixing main body is connected with the mixture outlet pipe, one side of the mixing main body is connected with the second inlet pipe, the second inlet pipe extends into the mixing main body, the end part of the second inlet pipe is vertically connected with a flow dividing pipe, the port part of the flow dividing pipe is in a sealing design, a plurality of fine holes are designed around the pipe wall of the flow dividing pipe, and the outlet end of the mixture outlet pipe;
the distributor comprises a liquid inlet pipe, a transverse pipe, transition pipes, distribution pipes, sleeve joints and a washing tower, wherein one end of the liquid inlet pipe is connected with the middle of one end of the transverse pipe through the flange joints, the other end of the transverse pipe is connected with one end of one transition pipe through a plurality of flange joints, the other end of each transition pipe is connected with one end of the corresponding transition pipe, the sleeve joints are provided with a plurality of distribution pipes and are arranged on the outer side of the washing tower, the distribution pipes extend into the washing tower from the sleeve joints, the other ends of the transition pipes are connected with the sleeve joints through the flange joints, the port parts of the distribution pipes are sealed, and a plurality of fine holes;
the sight glass include lens, bolt, nut, gland, base, the lens is designed into the strip lens, gland and base design rectangle form and centre all open and have rectangular form window, open in the middle of the base window outside has the step, open in the middle of the gland window inboard has the step, the lens dress is equipped with sealed the pad between the step of base and the step of gland and between lens and base and the gland, the gland both sides are passed through the bolt and the nut and are fixed on the base, the base welds all around on the tower body or on the cylinder staving.
2. The process of claim 1, wherein the acrylic acid stabilizer is selected from the group consisting of Fe, Mn and Cu metal salts, 2, 2, 6, 6-tetramethyl-1-piperidinyloxy (TEMPO), 4-hydroxy-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-hydroxy-TEMPO), 4-methoxy-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-methoxy-TEMPO) and 4-oxo-2, 2, 6, 6-tetramethyl-1-piperidinyloxy (4-oxo-TEMPO).
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| CN201610641005.1A CN106365996B (en) | 2016-08-08 | 2016-08-08 | Water washing process of isooctyl acrylate esterifying liquid |
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| FR2822825B1 (en) * | 2001-04-02 | 2003-05-16 | Atofina | PROCESS FOR THE MANUFACTURE OF 2-ETHYLHEXYL ACRYLATE COMPRISING THE WASHING OF RAW WATER |
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Address after: The Yangtze River town of Rugao city of Jiangsu province in 226500 in Nantong city (Rugao port) Yuejiang road Fine Chemical Industrial Park No. 1 Applicant after: Jiangsu Guojiao New Materials Co., Ltd. Address before: The Yangtze River town of Rugao city of Jiangsu province in 226500 in Nantong city (Rugao port) Yuejiang road Fine Chemical Industrial Park No. 1 Applicant before: JIANGSU GUOJIAO CHEMICAL TECHNOLOGY CO., LTD. |
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