CN213060710U - Benzyl dichloride continuous hydrolysis system - Google Patents
Benzyl dichloride continuous hydrolysis system Download PDFInfo
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- CN213060710U CN213060710U CN202021627195.XU CN202021627195U CN213060710U CN 213060710 U CN213060710 U CN 213060710U CN 202021627195 U CN202021627195 U CN 202021627195U CN 213060710 U CN213060710 U CN 213060710U
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Abstract
The utility model discloses a continuous benzyl dichloride hydrolysis system, which comprises at least two stages of reaction kettles, wherein a phase splitting tank is arranged behind the last stage of reaction kettle, and a storage tank is arranged behind the phase splitting tank; each stage of reation kettle top be equipped with a condenser, reation kettle upper portion side is equipped with the overflow mouth, links to each other with next one-level reation kettle through online composition analysis appearance and pneumatic control valve, last one-level reation kettle links to each other with the jar of dividing the phase through online composition analysis appearance and pneumatic control valve, the jar lower part of dividing the phase sets up the storage tank, the storage tank is equipped with the ball-cock assembly, the storage tank passes through the circulating pump and links to each other with first order reation kettle. Each stage of reaction kettle is provided with a temperature indicator, a pressure indicator and a liquid level meter, the bottom of each stage of reaction kettle is provided with a feed liquid outlet and is connected with the next stage of reaction kettle through a centrifugal pump, and the last stage of reaction kettle is connected with the phase splitting tank through the centrifugal pump. The utility model discloses with two sets of linkage control each grade reation kettle raw materials ratio, make each grade reaction go on smoothly, accomplish the serialization of benzyl dichloride and hydrolyze.
Description
Technical Field
The utility model relates to a benzyl dichloride continuous hydrolysis system.
Background
Benzaldehyde is an important chemical intermediate and is widely applied to the industries of medicines, pesticides, dyes, spices and the like. At present, the industrial preparation method of benzaldehyde is mainly a benzyl dichloride hydrolysis method, adopts batch kettle type reaction, and has poor quality stability of products among batches; the enamel reaction kettle faces the problem of continuous repeated temperature rise and fall, the service life is greatly shortened, and the energy consumption is high. A reliable method for solving the problems is to adopt continuous reaction, thereby not only ensuring the stable quality of products, but also reducing the damage to equipment and reducing the energy consumption.
CN102875342B proposes a method for preparing benzaldehyde by taking benzyl dichloride as a raw material and carrying out catalytic hydrolysis on hydrochloric acid in a microchannel reactor, wherein the reaction time is shortened to several minutes from the traditional several hours, but the conversion rate of the benzyl dichloride is only 69.2%, and the product and the raw material need to be further separated subsequently, so that the operation is troublesome. From the embodiment, the method still stays in the bench test stage, and the industrialization still has uncertainty.
Disclosure of Invention
An object of the utility model is to provide a benzyl dichloride serialization hydrolysis system that can realize serialization production.
The technical solution of the utility model is that:
a benzyl dichloride continuous hydrolysis system is characterized in that: the device comprises at least two stages of reaction kettles, wherein a phase separation tank is arranged behind the last stage of reaction kettle, and a storage tank is arranged behind the phase separation tank; the top of each stage of reaction kettle is provided with an acid water solution or water inlet, and the side edge of the lower part of the reaction kettle is provided with a benzyl dichloride inlet; each stage of reaction kettle is equipped with a condenser above, the side of the upper part of the reaction kettle is provided with an overflow port, the reaction kettle is connected with the next stage of reaction kettle through an online component analyzer and a pneumatic regulating valve, and the last stage of reaction kettle is connected with a phase splitting tank through the online component analyzer and the pneumatic regulating valve.
Each stage of reaction kettle is provided with a temperature indicator, a pressure indicator and a liquid level meter, the bottom of the reaction kettle is provided with a feed liquid outlet and is connected with the next stage of reaction kettle through a centrifugal pump, and the last stage of reaction kettle is connected with a phase splitting tank through a centrifugal pump.
The lower part of the phase separation tank is provided with a storage tank. The storage tank is provided with a ball float valve and is connected with the first-stage reaction kettle through a circulating pump.
The hydrolysis of benzyl dichloride is an oil-water two-phase reaction, during which a phase transfer catalyst is dissolved in water and continuously added into a first-stage reaction kettle together with the benzyl dichloride, the density of the oil-water two-phase changes along with the generation of benzaldehyde, and an oil layer gradually moves from a lower layer to an upper layer. The utility model introduces an on-line component analyzer-pneumatic regulating valve, the flow velocity of the oil phase overflowing into the next stage reaction kettle is controlled in a linkage way to be consistent with the flow velocity of the benzyl dichloride added into the first stage reaction kettle, and the oil phase is basically ensured to come out from an overflow port; introducing a liquid level meter-a centrifugal pump, pumping the water phase at the bottom of the reaction kettle into a next-stage reaction kettle or a phase separation tank by using the centrifugal pump when the liquid level is 15% higher than the overflow port until the liquid level reaches the overflow port of the reaction kettle. The raw material ratio in each stage of reaction kettle is controlled by the two sets of interlocking devices, so that each stage of reaction is smoothly carried out, and the continuous hydrolysis of the benzyl dichloride is completed.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The utility model provides a benzyl dichloride continuous hydrolysis system, including multistage reation kettle 9, condenser 1 is equipped with to each grade reation kettle top, noncondensable hydrogen chloride gas goes the tail gas and absorbs the workshop section, reation kettle upper portion side is equipped with the overflow mouth, the oil phase velocity of flow that goes into next-level reation kettle through online composition analysis appearance 3 and pneumatic control valve 4 interlocking control overflow between cauldron and the cauldron is unanimous with the benzyl dichloride velocity of flow that adds first reation kettle, the material gets into after last one-level reation kettle reaction reaches the technological index requirement, link to each other with phase separation jar 7 through online composition analysis appearance and pneumatic control valve, the export benzaldehyde product on the phase separation jar, export sour water to the storage tank 8 of lower part setting down, the storage tank passes through the automatic make-up water of ball float valve. And a liquid level meter 2 is arranged on each stage of reaction kettle, when the liquid level is 15% higher than the overflow port, the water phase in the reaction kettle is pumped into the next stage of reaction kettle or the phase separation tank by a centrifugal pump 5, and the process is finished when the liquid level reaches the overflow port of the reaction kettle.
The top of each stage of reaction kettle is provided with an acid water solution or water inlet, and the side edge of the lower part of the reaction kettle is provided with a benzyl dichloride inlet; continuously adding benzyl dichloride and water dissolved with a phase transfer catalyst into a first-stage reaction kettle, maintaining stirring and refluxing, starting two sets of interlocking devices when the liquid level is 15% higher than an overflow port, overflowing an oil phase to a second-stage reaction kettle, pumping a water phase into the second-stage reaction kettle through a centrifugal pump, and finishing when the liquid level of the first-stage reaction kettle reaches the overflow port; maintaining the reflux of the second-stage reaction kettle, maintaining stirring, starting two sets of interlocking devices when the liquid level of the second-stage reaction kettle is 15% higher than the overflow port, enabling the oil phase to overflow to the third-stage reaction kettle, and pumping the water phase into the third-stage reaction kettle through a centrifugal pump until the liquid level of the second-stage reaction kettle reaches the overflow port; according to the method, when the liquid level of the last stage reaction kettle is 15% higher than the overflow port, two sets of interlocking devices are started, the oil phase overflows to the phase separation tank 7, the water phase is pumped into the phase separation tank 7 through a centrifugal pump, and the process is finished when the liquid level of the last stage reaction kettle reaches the overflow port. Benzaldehyde is separated from an upper outlet of the phase separation tank, and a water phase enters a storage tank 8 from a lower outlet and returns to the first-stage reaction kettle through a circulating pump 6 to continue to react.
Claims (3)
1. A benzyl dichloride continuous hydrolysis system is characterized in that: the device comprises at least two stages of reaction kettles, wherein a phase separation tank is arranged behind the last stage of reaction kettle, and a storage tank is arranged behind the phase separation tank; the top of each stage of reaction kettle is provided with an acid water solution or water inlet, and the side edge of the lower part of the reaction kettle is provided with a benzyl dichloride inlet;
a condenser is arranged above each stage of reaction kettle, an overflow port is arranged on the side edge of the upper part of the reaction kettle and is connected with the next stage of reaction kettle through an online component analyzer and a pneumatic regulating valve, and the last stage of reaction kettle is connected with the phase splitting tank through the online component analyzer and the pneumatic regulating valve;
each stage of reaction kettle is provided with a temperature indicator, a pressure indicator and a liquid level meter, the bottom of the reaction kettle is provided with a feed liquid outlet and is connected with the next stage of reaction kettle through a centrifugal pump, and the last stage of reaction kettle is connected with a phase splitting tank through a centrifugal pump.
2. The continuous hydrolysis system of benzyl dichloride according to claim 1, wherein: the lower part of the phase separation tank is provided with a storage tank.
3. The continuous hydrolysis system of benzyl dichloride according to claim 2, wherein: the storage tank is provided with a ball float valve and is connected with the first-stage reaction kettle through a circulating pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021627195.XU CN213060710U (en) | 2020-08-07 | 2020-08-07 | Benzyl dichloride continuous hydrolysis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021627195.XU CN213060710U (en) | 2020-08-07 | 2020-08-07 | Benzyl dichloride continuous hydrolysis system |
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| Publication Number | Publication Date |
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| CN213060710U true CN213060710U (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021627195.XU Active CN213060710U (en) | 2020-08-07 | 2020-08-07 | Benzyl dichloride continuous hydrolysis system |
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| CN (1) | CN213060710U (en) |
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2020
- 2020-08-07 CN CN202021627195.XU patent/CN213060710U/en active Active
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