CN214763389U - Rectification energy-saving device in cyclohexanone oxime production process by cyclohexanone ammoximation method - Google Patents
Rectification energy-saving device in cyclohexanone oxime production process by cyclohexanone ammoximation method Download PDFInfo
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- CN214763389U CN214763389U CN202121283950.1U CN202121283950U CN214763389U CN 214763389 U CN214763389 U CN 214763389U CN 202121283950 U CN202121283950 U CN 202121283950U CN 214763389 U CN214763389 U CN 214763389U
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Abstract
The utility model relates to a cyclohexanone ammoximation method production cyclohexanone oxime in-process rectification economizer comprises toluene rectifying column, toluene condenser, toluene postcondenser, oxime rectifying column, toluene oxime condenser, toluene oxime postcondenser, mechanical type vacuum pump. The mechanical vacuum pump is adopted to replace the steam jet pump in the prior art, no steam is consumed, no waste water is generated, and organic materials in the non-condensable gas can be conveniently recycled. The utility model discloses can reduce cyclohexanone ammoximation device's energy consumption and material consumption, reduce the sewage volume, from energy-conserving and environmental protection convenience all having great meaning.
Description
Technical Field
The utility model belongs to the technical field of petrochemical, a cyclohexanone ammoximation method production cyclohexanone oxime in-process rectification economizer is related to.
Background
Cyclohexanone oxime is an important intermediate product in the existing caprolactam production process, and a cyclohexanone ammoximation method is generally adopted at present: in a solvent of tert-butyl alcohol, under the action of a catalyst, carrying out an ammoximation reaction on raw materials of cyclohexanone, ammonia and hydrogen peroxide to generate cyclohexanone oxime; separating the catalyst by a membrane filter, and sending the reaction clear liquid to a solvent recovery process; after distillation, the tert-butyl alcohol returns to the reaction system, and the oxime aqueous solution is sent to the extraction process; toluene is used as an extracting agent, after an oxime aqueous solution is extracted, an oil phase toluene oxime solution is washed by water and then sent to an oxime refining process.
The oxime refining procedure consists of a toluene rectification system and an oxime rectification system. Adding the toluene oxime solution into a toluene rectifying tower, rectifying under vacuum condition, evaporating toluene gas without oxime from the tower top, condensing and cooling, pumping part of materials back to the tower top for reflux, and returning the rest materials to the toluene extraction process; sending oxime solution containing a small amount of water in the tower bottom into an oxime rectifying tower, rectifying under vacuum, condensing and cooling toluene containing oxime obtained at the tower top, and sending the cooled toluene into a toluene regeneration process; feeding cyclohexanone oxime produced in the tower bottom into a cyclohexanone oxime rearrangement process.
Because cyclohexanone-oxime is a heat-sensitive substance, the toluene rectifying tower and the oxime rectifying tower both adopt vacuum operation to reduce the operating temperature of materials. In the prior art, after a gas phase at the top of a toluene rectifying tower is condensed and cooled by a toluene condenser and a toluene post-condenser, noncondensable gas is vacuumized by a two-stage steam jet pump, so that the operation pressure at the top of the toluene rectifying tower is ensured to be 15-35kPa (different for different production enterprises); and after the gas phase at the top of the oxime rectifying tower is condensed and cooled by a toluene oxime condenser and a toluene oxime postcondenser, the non-condensable gas is vacuumized by a two-stage steam jet pump, and the operation pressure at the top of the oxime rectifying tower is ensured to be 10-15 kPa. And (4) the condensate after condensation and cooling enters a reflux tank, and the wastewater after oil-water separation is sent to a wastewater stripping tower to recover toluene and then sent to a sewage treatment plant.
In the existing process, a toluene rectifying tower and an oxime rectifying tower adopt a steam jet pump to obtain vacuum, so that steam is consumed, waste water is generated, and the energy consumption of a waste water stripping tower is increased. Therefore, the research on the vacuum system process of the two towers and the development of a new vacuum device have great significance for reducing steam consumption, sewage discharge and the like.
The utility model discloses vacuum system to toluene rectifying column and oxime rectifying column adopts mechanical type vacuum pump device, has effectively reduced energy consumption and waste water treatment volume etc. in the cyclohexanone oxime production process, all has very meaningful in energy-concerving and environment-protective and economy.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a cyclohexanone ammoximation method production cyclohexanone oxime in-process rectification economizer reduces energy consumption and waste water treatment volume etc. and reduction device running cost.
The technical scheme of the utility model
One embodiment is as follows: a rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method comprises a toluene rectifying tower, a toluene condenser, a toluene post-condenser and a toluene rectifying tower mechanical vacuum pump; the system comprises an oxime rectifying tower, a toluene oxime condenser, a toluene oxime post-condenser and an oxime rectifying tower mechanical vacuum pump;
a gas phase outlet from the toluene rectifying tower is connected with a hot side inlet of a toluene condenser, the gas phase outlet at the hot side of the toluene condenser is connected with a hot side inlet of a toluene post-condenser, a noncondensable gas outlet at the hot side of the toluene post-condenser is connected with an inlet of a mechanical vacuum pump of the toluene rectifying tower, and a liquid phase outlet at the hot side of the toluene condenser, a liquid phase outlet at the hot side of the toluene post-condenser and a liquid phase outlet of the mechanical vacuum pump of the toluene rectifying tower are connected with a condensate reflux tank together;
the gas phase outlet of the oxime rectification tower is connected with the hot side inlet of a toluene oxime condenser, the gas phase outlet of the hot side of the toluene oxime condenser is connected with the hot side inlet of a toluene oxime post-condenser, the non-condensable gas outlet of the hot side of the toluene oxime post-condenser is connected with the inlet of a mechanical vacuum pump of the oxime rectification tower, and the liquid phase outlet of the hot side of the toluene oxime condenser, the liquid phase outlet of the hot side of the benzene oxime post-condenser and the liquid phase outlet of the mechanical vacuum pump of the oxime rectification tower are respectively connected with a condensate reflux tank;
the non-condensable gas outlet of the mechanical vacuum pump of the toluene rectifying tower and the non-condensable gas outlet of the mechanical vacuum pump of the oxime rectifying tower are connected with a subsequent treatment system together.
In another embodiment: a rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method comprises a toluene rectifying tower, a toluene condenser, a toluene post-condenser, an oxime rectifying tower, a toluene oxime condenser, a toluene oxime post-condenser and a mechanical vacuum pump;
a gas phase outlet from the toluene rectifying tower is connected with a hot side inlet of a toluene condenser, the gas phase outlet at the hot side of the toluene condenser is connected with a hot side inlet of a toluene post-condenser, and a liquid phase outlet at the hot side of the toluene condenser and a liquid phase outlet at the hot side of the toluene post-condenser are connected with a condensate reflux tank together;
the gas phase outlet at the hot side of the toluene oxime condenser is connected with the inlet at the hot side of the toluene oxime condenser, the gas phase outlet at the hot side of the toluene oxime condenser is connected with the inlet at the hot side of the toluene oxime post-condenser, the gas phase outlet at the hot side of the toluene oxime post-condenser is connected with the inlet of a mechanical vacuum pump of the oxime rectification tower, and the liquid phase outlet at the hot side of the toluene oxime condenser and the liquid phase outlet at the hot side of the benzene oxime post-condenser are connected with a condensate reflux tank together;
the non-condensable gas outlet at the hot side of the toluene post-condenser and the non-condensable gas outlet at the hot side of the benzoxime post-condenser are connected with the inlet of a mechanical vacuum pump together, the gas-phase outlet of the mechanical vacuum pump is connected with a subsequent treatment system, and the liquid-phase outlet of the mechanical vacuum pump is connected with a condensate reflux tank.
In the above embodiment:
the mechanical vacuum pump is a dry vacuum pump, a roots vacuum pump, a screw vacuum pump, and the dry vacuum pump is combined with the roots vacuum pump and the screw vacuum pump.
The mechanical vacuum pump is a two-stage or more multi-stage mechanical vacuum pump.
The mechanical vacuum pump is provided with a condenser at the back, a liquid phase outlet of the condenser is connected with a condensate reflux tank, and a non-condensable gas outlet is connected with an aftertreatment system.
An interstage condenser is arranged between the multistage mechanical vacuum pumps.
The characteristics and effects of the utility model
The utility model adopts a mechanical vacuum pump device for a toluene rectifying tower and an oxime rectifying tower vacuum system in a cyclohexanone oxime production device, and can save steam consumption by about 1.3t/h for a 10 ten thousand ton/year-scale cyclohexanone oxime device; the sewage discharge is reduced by about 1.3 t/h. Effectively reduces the energy consumption, the wastewater treatment capacity and the like in the production process of the cyclohexanone-oxime, and has significance in energy conservation, environmental protection and economy.
Drawings
FIG. 1 shows a rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method
In the figure:
1-toluene condenser, 2-toluene postcondenser, 3-toluene oxime condenser, 4-toluene oxime postcondenser, 5-toluene rectifying tower mechanical vacuum pump and 6-oxime rectifying tower mechanical vacuum pump; CW-circulating cooling water, RW-chilled water.
FIG. 2 shows a rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method
In the figure:
1-toluene condenser, 2-toluene postcondenser, 3-toluene oxime condenser, 4-toluene oxime postcondenser and 7-mechanical vacuum pump; CW-circulating cooling water, RW-chilled water.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the present invention.
Example 1:
a rectification energy-saving device of a cyclohexanone-oxime device producing 10 ten thousand tons of cyclohexanone-oxime annually, as shown in a process flow shown in figure 1.
After the gas phase at the top of the toluene rectifying tower is condensed and cooled by a toluene condenser (1) and a toluene post-condenser (2), the non-condensable gas of the system is connected with a mechanical vacuum pump (5) of the toluene rectifying tower, the gas phase of the mechanical vacuum pump (5) of the toluene rectifying tower is connected with a subsequent treatment system, and the condensate is discharged to a reflux tank; and after the gas phase at the top of the oxime rectifying tower is condensed and cooled by a toluene oxime condenser (3) and a toluene oxime postcondenser (4), the non-condensable gas is connected with an oxime rectifying tower mechanical vacuum pump (6), the oxime rectifying tower mechanical vacuum pump (6) is in gas phase connection with a subsequent treatment system, and the condensate is discharged to a reflux tank.
The utility model discloses can reduce about low pressure steam 1.3 tons per hour than current device, reduce about 1.3 tons per hour of waste water volume, can retrieve organic matters such as a small amount of toluene in the noncondensable gas.
Example 2:
a rectification energy-saving device of a cyclohexanone-oxime device producing 10 ten thousand tons of cyclohexanone-oxime annually, as shown in a process flow of figure 2.
The gas phase at the top of the toluene rectifying tower is condensed and cooled by a toluene condenser (1) and a toluene postcondenser (2), and the non-condensable gas of the system is connected with a mechanical vacuum pump (5); and after the gas phase at the top of the oxime rectifying tower is condensed and cooled by a toluene oxime condenser (3) and a toluene oxime postcondenser (4), noncondensable gas is also connected with a mechanical vacuum pump (7), the mechanical vacuum pump (7) is in gas phase connection with a subsequent treatment system, and condensate is discharged to a reflux tank.
The utility model discloses can reduce about low pressure steam 1.3 tons per hour than current device, reduce about 1.3 tons per hour of waste water volume, can retrieve organic matters such as a small amount of toluene in the noncondensable gas.
Claims (6)
1. A rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method comprises a toluene rectifying tower, a toluene condenser, a toluene post-condenser and a toluene rectifying tower mechanical vacuum pump; the system comprises an oxime rectifying tower, a toluene oxime condenser, a toluene oxime post-condenser and an oxime rectifying tower mechanical vacuum pump; the method is characterized in that:
a gas phase outlet from the toluene rectifying tower is connected with a hot side inlet of a toluene condenser, the gas phase outlet at the hot side of the toluene condenser is connected with a hot side inlet of a toluene post-condenser, a noncondensable gas outlet at the hot side of the toluene post-condenser is connected with an inlet of a mechanical vacuum pump of the toluene rectifying tower, and a liquid phase outlet at the hot side of the toluene condenser, a liquid phase outlet at the hot side of the toluene post-condenser and a liquid phase outlet of the mechanical vacuum pump of the toluene rectifying tower are connected with a condensate reflux tank together;
the gas phase outlet of the oxime rectification tower is connected with the hot side inlet of a toluene oxime condenser, the gas phase outlet of the hot side of the toluene oxime condenser is connected with the hot side inlet of a toluene oxime post-condenser, the non-condensable gas outlet of the hot side of the toluene oxime post-condenser is connected with the inlet of a mechanical vacuum pump of the oxime rectification tower, and the liquid phase outlet of the hot side of the toluene oxime condenser, the liquid phase outlet of the hot side of the benzene oxime post-condenser and the liquid phase outlet of the mechanical vacuum pump of the oxime rectification tower are respectively connected with a condensate reflux tank;
the non-condensable gas outlet of the mechanical vacuum pump of the toluene rectifying tower and the non-condensable gas outlet of the mechanical vacuum pump of the oxime rectifying tower are connected with a subsequent treatment system together.
2. A rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method comprises a toluene rectifying tower, a toluene condenser, a toluene post-condenser, an oxime rectifying tower, a toluene oxime condenser, a toluene oxime post-condenser and a mechanical vacuum pump; the method is characterized in that:
a gas phase outlet from the toluene rectifying tower is connected with a hot side inlet of a toluene condenser, the gas phase outlet at the hot side of the toluene condenser is connected with a hot side inlet of a toluene post-condenser, and a liquid phase outlet at the hot side of the toluene condenser and a liquid phase outlet at the hot side of the toluene post-condenser are connected with a condensate reflux tank together;
the gas phase outlet at the hot side of the toluene oxime condenser is connected with the inlet at the hot side of the toluene oxime condenser, the gas phase outlet at the hot side of the toluene oxime condenser is connected with the inlet at the hot side of the toluene oxime post-condenser, the gas phase outlet at the hot side of the toluene oxime post-condenser is connected with the inlet of a mechanical vacuum pump of the oxime rectification tower, and the liquid phase outlet at the hot side of the toluene oxime condenser and the liquid phase outlet at the hot side of the benzene oxime post-condenser are connected with a condensate reflux tank together;
the non-condensable gas outlet at the hot side of the toluene post-condenser and the non-condensable gas outlet at the hot side of the benzoxime post-condenser are connected with the inlet of a mechanical vacuum pump together, the gas-phase outlet of the mechanical vacuum pump is connected with a subsequent treatment system, and the liquid-phase outlet of the mechanical vacuum pump is connected with a condensate reflux tank.
3. The rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method according to claim 1 or 2, characterized in that the mechanical vacuum pump is a dry vacuum pump, a roots vacuum pump, a screw vacuum pump, and the combination of the dry vacuum pump, the roots vacuum pump and the screw vacuum pump.
4. The rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method according to claim 1 or 2, characterized in that the mechanical vacuum pump is a two-stage or multi-stage mechanical vacuum pump.
5. The rectification energy-saving device in the process of producing cyclohexanone oxime by the cyclohexanone ammoximation method according to claim 1 or 2, which is characterized in that a condenser is arranged behind the mechanical vacuum pump, a liquid phase outlet of the condenser is connected with a condensate reflux tank, and a noncondensable gas outlet is connected with an aftertreatment system.
6. The rectification energy-saving device in the process of producing cyclohexanone oxime by a cyclohexanone ammoximation method according to claim 4, which is characterized in that an interstage condenser is arranged between the multistage mechanical vacuum pumps.
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