CN217313345U

CN217313345U - Aliphatic nitrile production system

Info

Publication number: CN217313345U
Application number: CN202221245584.5U
Authority: CN
Inventors: 安福宇; 张鑫; 左磊
Original assignee: Zibo Tenghui Oil Chemical Co ltd
Current assignee: Zibo Tenghui Oil Chemical Co ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-08-30
Anticipated expiration: 2032-05-20

Abstract

The utility model discloses a fat nitrile production system belongs to fat nitrile production technical field. The technical scheme is as follows: comprises a reaction kettle, the top of the reaction kettle is connected with a stearic acid feeder and a catalyst feeder, and a pipeline at the bottom of the catalyst feeder extends into the bottom of the reaction kettle; the lower part of the reaction kettle is connected with an ammonia pipeline; the top of the reaction kettle is also connected with a first condenser, and a reflux pipeline of the first condenser is connected with a reflux port of the reaction kettle; a discharge pipeline at the bottom of the reaction kettle is connected with a first distiller, a circulating pipeline at the lower part of the first distiller is connected with a reboiler, and a discharge pipeline of the reboiler is connected with a circulating port of the first distiller; the top of the first distiller is sequentially connected with a second condenser, and a discharge pipeline of the second condenser is connected with a fatty nitrile storage tank. The utility model discloses prolonged the life of valve, can also in time discharge the residue when guaranteeing that production goes on smoothly, guaranteed distillation yield and product quality.

Description

Aliphatic nitrile production system

Technical Field

The utility model relates to a fat nitrile production technical field, concretely relates to fat nitrile production system.

Background

The fatty nitrile is a basic fatty acid nitrogenous derivative generated by fatty acid and ammonia, and the reaction principle is that the first water molecule is removed to generate fatty phthalein amine, and the second water molecule is removed to generate fatty nitrile, and the reaction is carried out at the temperature of 280-360 ℃ under the action of a metal oxide catalyst. Aliphatic nitriles are starting materials for the preparation of primary and secondary aliphatic amines, and can also be used in one-step processes for the preparation of tertiary amines.

The existing device for synthesizing the aliphatic nitrile has the following two problems: 1) because the zinc oxide catalyst powder has viscosity, the zinc oxide catalyst powder is easy to hang on a wall on a valve and a reaction kettle, the service life of the valve is influenced, and the production efficiency is influenced in severe cases; 2) in the distillation step, the residue in the distiller is not removed and continues to participate in the next reaction, thereby lowering the distillation yield and the product quality.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, the fatty nitrile production system is provided, the service life of the valve is prolonged, the smooth production is ensured, meanwhile, the residues can be discharged in time, and the distillation yield and the product quality are ensured.

The technical scheme of the utility model is that:

a fatty nitrile production system comprises a reaction kettle, wherein the top of the reaction kettle is connected with a stearic acid feeder and a catalyst feeder, and a pipeline at the bottom of the catalyst feeder extends into the bottom of the reaction kettle; the lower part of the reaction kettle is connected with an ammonia pipeline; the top of the reaction kettle is also connected with a first condenser, and a reflux pipeline of the first condenser is connected with a reflux port of the reaction kettle; a discharge pipeline at the bottom of the reaction kettle is connected with a first distiller, a circulating pipeline at the lower part of the first distiller is connected with a reboiler, and a discharge pipeline of the reboiler is connected with a circulating port of the first distiller; the top of the first distiller is sequentially connected with a second condenser, and a discharge pipeline of the second condenser is connected with a fatty nitrile storage tank; the discharge pipeline at the bottom of the first distiller is connected with a second distiller, the top of the second distiller is connected with a third condenser, and the discharge pipeline of the third condenser is connected with the first distiller.

Preferably, the gas outlet pipeline of the second condenser is connected with a fourth condenser, and the discharge pipeline of the fourth condenser is connected with the aliphatic nitrile storage tank.

Preferably, the air outlets of the first condenser, the third condenser and the fourth condenser are respectively connected with a vacuum-pumping pipeline.

Preferably, the bottom of the second still is provided with a residue line.

Preferably, a pump is arranged on a discharge pipeline between the first distiller and the second distiller.

Preferably, a flow meter is arranged on a pipeline between the stearic acid feeder and the reaction kettle, so that the adding rate of stearic acid can be conveniently controlled.

Compared with the prior art, the utility model, following beneficial effect has:

the utility model discloses a stretch into the reation kettle bottom with the pipeline of catalyst charging means bottom for can directly fall in the reation kettle bottom when the catalyst is reinforced, can not hang the wall on valve and reation kettle, prolonged the life of valve, guaranteed going on smoothly of production. And simultaneously, the utility model discloses a further retrieve aliphatic nitrile wherein in sending the residue pump sending of first distiller bottom to the second distiller, not only avoided the waste of material, can also in time discharge the residue, guaranteed distillation yield and product quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

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

In the figure, 1-reaction kettle, 2-stearic acid feeder, 3-catalyst feeder, 4-ammonia pipeline, 5-first condenser, 6-first distiller, 7-reboiler, 8-second condenser, 9-aliphatic nitrile storage tank, 10-second distiller, 11-third condenser, 12-fourth condenser, 13-vacuum-pumping pipeline, 14-residue pipeline and 15-pump.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Example 1

As shown in fig. 1, the embodiment provides a fatty nitrile production system, which includes a reaction kettle 1, a stearic acid feeder 2 and a catalyst feeder 3 are connected to the top of the reaction kettle 1, a flow meter is arranged on a pipeline between the stearic acid feeder 2 and the reaction kettle 1, and a pipeline at the bottom of the catalyst feeder 3 extends to the bottom of the reaction kettle 1; the lower part of the reaction kettle 1 is connected with an ammonia pipeline 4; the top of the reaction kettle 1 is also connected with a first condenser 5, and a reflux pipeline of the first condenser 5 is connected with a reflux port of the reaction kettle 1; a discharge pipeline at the bottom of the reaction kettle 1 is connected with a first distiller 6, a circulating pipeline at the lower part of the first distiller 6 is connected with a reboiler 7, and a discharge pipeline of the reboiler 7 is connected with a circulating port of the first distiller 6; the top of the first distiller 6 is sequentially connected with a second condenser 8, and a discharge pipeline of the second condenser 8 is connected with an aliphatic nitrile storage tank 9; a discharge pipeline at the bottom of the first distiller 6 is connected with a second distiller 10, and a pump 15 is arranged on the discharge pipeline; the top of the second distiller 10 is connected with a third condenser 11, the discharge pipeline of the third condenser 11 is connected with the first distiller 6, and the bottom of the second distiller 10 is provided with a residue pipeline 14.

The working principle is as follows:

when producing the aliphatic nitrile, stearic acid is added into the reaction kettle 1, and then the zinc oxide catalyst is added while stirring. Because the pipeline at the bottom of the catalyst feeder 3 stretches into the bottom of the reaction kettle 1, the catalyst can directly fall to the bottom of the reaction kettle 1, the adhesion of the catalyst on the valve and the inner wall of the reaction kettle 1 is avoided, and the service life of the valve is prolonged. The ammonia gas in the reaction kettle 1 can be concentrated at the top of the reaction kettle 1 in the reaction, and at the moment, the ammonia gas is condensed by the first condenser 5 and then returns to the reaction kettle 1 to continue to participate in the reaction, so that the utilization rate of the ammonia gas is improved. The crude aliphatic nitrile produced at the bottom of the reaction vessel 1 is fed to a first distillation vessel 6 to be subjected to a distillation process. In the distillation process, the fatty nitrile in the crude fatty nitrile is gaseous, enters a second condenser 8 from the top of a first distiller 6 and is condensed into a refined fatty nitrile product, and then enters a fatty nitrile storage tank 9, and the liquid fatty nitrile is heated by a reboiler 7 to circulate the materials; the residue that is not vaporized in the first distiller 6 is pumped to the second distiller 10 to distill the residue. During the distillation process, the residue entering the second distiller 10 enters the third condenser 11 from the top of the second distiller 10 after the fatty nitrile in the residue is gasified, is condensed into a liquid state, then returns to the first distiller 6 as a reflux liquid to participate in the distillation of the crude fatty nitrile again, and can remove entrainment in the gaseous fatty nitrile while the reflux liquid exchanges heat with the gaseous fatty nitrile in the first distiller 6. Finally, the residue that is not vaporized in the second still 10 is discharged through the residue line 14.

Example 2

On the basis of the embodiment 1, the gas outlet pipeline of the second condenser 8 is connected with a fourth condenser 12, and the discharge pipeline of the fourth condenser 12 is connected with the aliphatic nitrile storage tank 8. The fourth condenser 12 may further condense the gas not condensed in the second condenser 8 into a liquid.

Example 3

In addition to embodiment 2, the gas outlets of the first condenser 5, the third condenser 11 and the fourth condenser 12 are respectively connected to a vacuum-pumping pipeline 13, so that uncondensed gas can be pumped out and then centrally treated and discharged.

Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An aliphatic nitrile production system, characterized in that: comprises a reaction kettle (1), wherein the top of the reaction kettle (1) is connected with a stearic acid feeder (2) and a catalyst feeder (3), and a pipeline at the bottom of the catalyst feeder (3) extends into the bottom of the reaction kettle (1); the lower part of the reaction kettle (1) is connected with an ammonia pipeline (4); the top of the reaction kettle (1) is also connected with a first condenser (5), and a reflux pipeline of the first condenser (5) is connected with a reflux port of the reaction kettle (1); a discharge pipeline at the bottom of the reaction kettle (1) is connected with a first distiller (6), a circulating pipeline at the lower part of the first distiller (6) is connected with a reboiler (7), and a discharge pipeline of the reboiler (7) is connected with a circulating port of the first distiller (6); the top of the first distiller (6) is sequentially connected with a second condenser (8), and a discharge pipeline of the second condenser (8) is connected with an aliphatic nitrile storage tank (9); the discharge pipeline at the bottom of the first distiller (6) is connected with a second distiller (10), the top of the second distiller (10) is connected with a third condenser (11), and the discharge pipeline of the third condenser (11) is connected with the first distiller (6).

2. The aliphatic nitrile production system according to claim 1, wherein: the gas outlet pipeline of the second condenser (8) is connected with a fourth condenser (12), and the discharge pipeline of the fourth condenser (12) is connected with the aliphatic nitrile storage tank (9).

3. The aliphatic nitrile production system according to claim 2, wherein: and air outlets of the first condenser (5), the third condenser (11) and the fourth condenser (12) are respectively connected with a vacuum-pumping pipeline (13).

4. The aliphatic nitrile production system according to claim 1, wherein: the bottom of the second still (10) is provided with a residue line (14).

5. The aliphatic nitrile production system according to claim 1, wherein: a pump (15) is arranged on a discharge pipe line between the first distiller (6) and the second distiller (10).

6. The aliphatic nitrile production system according to claim 1, wherein: a flow meter is arranged on a pipeline between the stearic acid feeder (2) and the reaction kettle (1).