CN2701527Y

CN2701527Y - Jetting downwards type reactor

Info

Publication number: CN2701527Y
Application number: CN 200420010851
Authority: CN
Inventors: 高飞; 张萌; 徐小琳
Original assignee: Henan University
Current assignee: Henan University
Priority date: 2004-05-21
Filing date: 2004-05-21
Publication date: 2005-05-25
Anticipated expiration: 2014-05-21

Abstract

Disclosed is a jetting downwards type reactor, belonging to the plant technical field of chemical reaction. It comprises autoclaves for bring in and discharge door. The middle of the upper part of the autoclave is connected to the liquid outlet of a liquid jetting vacuum pump, the liquid outlet pipe of the liquid jetting pump extends into the bottom of the autoclave, the liquid inlet of the liquid jet vacuum pump is connected with the lower part of the autoclave through a connection pipe in connection in series with a non-leakage pump. The pump-out slot of the liquid jet vacuum pump is connected to the reaction liquid inlet, the upper side of the autoclave and the atmosphere. A heat exchanger is arranged on the pipelines between the liquid inlet of the liquid jet vacuum pump and the non-leakage pump, and a liquid pipe line passes through the middle of the heat exchanger. The pump-out slot of the liquid jet vacuum pump is connected to the reaction liquid inlet pipe through the horizontal tube of a forked tube, and the drive-pipe is connected to the upper side surface of the autoclave, the drive-pipe is equipped with an air inlet switch. The upper part of the autoclave is equipped with an exhaust gas exit. The preparation for positive hexanoic acid making use of the utility model reacts sufficiently and can avoid pollution effectively.

Description

Downward injection type reactor

Technical Field

The utility model belongs to the technical field of chemical reaction device, in particular to downward injection formula reactor that can be used to nitric acid oxidation sec-octanol preparation n hexanoic acid.

Background

The reaction formula for preparing the n-hexanoic acid by oxidizing the sec-octanol with the nitric acid is as follows:

the reaction is carried out in the presence of a catalyst (ammonium vanadate, vanadium pentoxide, a composite catalyst composed of elements such as vanadium, molybdenum, phosphorus and the like) and under the heating condition. The equipment used for the reaction is a common reaction kettle. The process comprises the following steps: adding secondary octanol, a catalyst and the like into a reaction kettle in sequence, and dripping nitric acid with certain concentration for oxidation under stirring (mechanical stirring or compressed air stirring). And separating out the waste acid liquid after the reaction is finished, wherein the waste acid liquid is used for diluting the nitric acid. Washing the crude oxidation solution after acid separation with (equal volume of) water for more than two times to wash out the nitrogen oxide acidic substances dissolved in the crude oxidation solution (simultaneously washing away most of acetic acid which is easily dissolved in water in the oxidation solution). Rectifyingthe purified crude oxidation liquid to obtain a main product of n-hexanoic acid, a byproduct of valeric acid, heptanoic acid and the like. The main polluting wastes formed in the production are: large amount of NO and NO released from oxidation process₂The mixed gas is diluted acid waste liquid containing acetic acid, nitric acid, nitrous acid and the like generated in the water washing process. NO₂The gas has good solubility, and can be dissolved and absorbed by octanol and then used for oxidation, or completely absorbed and eliminated by dilute alkaline water. However, NO gas has poor solubility, and can be completely absorbed only by using extremely concentrated excessive strong alkali aqueous solution (such as NaOH aqueous solution with the pH of above 12), so that qualified sodium nitrite products cannot be obtained except for consuming a large amount of alkali. From the economic perspective, most caproic acid manufacturers can not treat tail gas thoroughly, and a large amount of NO is discharged. NO oxidized into yellow NO in the presence of air_xCausing serious air pollution.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a downward injection formula reactor utilizes this reactor to prepare n hexanoic acid with the sec octanol of nitric acid oxidation, and the reaction is complete, can effectively avoid polluting.

In order to achieve the purpose, the utility model adopts the following technical scheme: a downward injection type reactor comprises a reaction kettle with a feeding port and a discharging port, wherein the middle of the upper part of the reaction kettle is connected with a liquid outlet of a liquid injection vacuum pump, a liquid outlet pipe of the liquid injection vacuum pump extends into the bottom of the reaction kettle, a liquid inlet of the liquid injection vacuum pump is connected with the lower end of the reaction kettle through a connecting pipe which is connected with a non-leakage pump in series, and a suction port of the liquid injection vacuum pump is communicated with a reaction liquid inlet pipe, the side surface of the upper part of the.

A heat exchanger is arranged on a pipeline between the liquid inlet of the liquid jet vacuum pump and the non-leakage pump, and a liquid pipeline penetrates through the middle of the heat exchanger.

The suction port of the liquid jet vacuum pump is communicated with the reaction liquid inlet pipe through the transverse pipe of the three-way pipe, and is communicated with the side surface of the upper part of the reaction kettle through the vertical pipe of the three-way pipe, and the vertical pipe is provided with an air inlet switch.

The upper part of the reaction kettle is provided with a waste gas outlet.

The utility model discloses when using, in adding reation kettle to second octanol and catalyst in advance, open the no leakage pump and inhale nitric acid and air through liquid jet vacuum pump suction mouth, still inhale the nitrogen oxide class gas that emits in the reaction simultaneously. The oxidation of low-valent NO into high-valent NO by the oxidation of air_xCan directly participate in the reaction, thereby effectively reducing the NO content in the tail gas, reducing the workload of tail gas treatment (only by using dilute alkaline water with the pH of less than 9), and lightening the air pollution. Nitric acid, air, secondary octanol, catalyst, nitrogen oxide gas and the like are uniformly mixed in the jet pump, and jetted liquid is sent to the bottom of the reactor through the liquid inlet pipe, so that the liquid phase is fully stirred, the reaction is facilitated, and the reaction is complete. The whole reactor forms a complete circulation loop, no dynamicsealing part exists in the circulation system, no abrasion exists, and leakage is effectively treated.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

Embodiment 1, downward injection formula reactor, including reation kettle 1, the middle 6 liquid outlet of liquid jet vacuum pump of reation kettle 1 upper portion is connected, and 2 is reation kettle center feed liquor hole. The liquid outlet pipe 8 of the liquid jet vacuum pump 6 extends into the bottom of the reaction kettle 1, the liquid inlet 7 of the liquid jet vacuum pump 6 is connected with the lower outlet 3 of the reaction kettle 1 through a connecting pipe which is connected with a non-leakage pump 13 in series, the suction port 9 of the liquid jet vacuum pump 6 is communicated with a nitric acid inlet pipe 12 through the transverse pipe of a three-way pipe and communicated with the side outlet 5 on the upper part of the reaction kettle 1 through a vertical pipe 10 of the three-way pipe, and the vertical pipe 10 is provided with an air inlet 11. A condenser 14 is arranged on a pipeline between the liquid inlet 7 of the liquid jet vacuum pump 6 and the non-leakage pump 13, and a liquid pipeline passes through the middle of the condenser 14. The upper part of the reaction kettle 1 is provided with a waste gas outlet 4. The upper part of the reaction kettle is additionally provided with a solid material and liquid material charging port.

Claims

1. The downward jet reactor comprises a reaction kettle with a feed port and a discharge port, and is characterized in that the middle of the upper partof the reaction kettle is connected with a liquid outlet of a liquid jet vacuum pump, a liquid outlet pipe of the liquid jet vacuum pump extends into the bottom of the reaction kettle, a liquid inlet of the liquid jet vacuum pump is connected with the lower end of the reaction kettle through a connecting pipe which is connected with a leakage-free pump in series, and a suction port of the liquid jet vacuum pump is communicated with a reaction liquid inlet pipe, the side surface of the upper part of the reaction.

2. The reactor as claimed in claim 1, wherein a heat exchanger is installed on a pipeline between the liquid inlet of the liquid jet vacuum pump and the non-leakage pump, and the liquid pipeline passes through the heat exchanger.

3. The reactor as claimed in claim 1 or 2, wherein the suction port of the liquid jet vacuum pump is communicated with the reaction liquid inlet pipe through the transverse pipe of the three-way pipe, and is communicated with the side surface of the upper part of the reaction kettle through the vertical pipe of the three-way pipe, and the vertical pipe is provided with an air inlet switch.

4. The reactor of claim 3 wherein the reactor vessel has an exhaust gas outlet at the upper portion.