CN216458715U - Temperature control system of acetonitrile reactor - Google Patents

Abstract

The utility model belongs to the technical field of the acetonitrile is refined, concretely relates to acetonitrile reactor temperature control system, including the reactor, the upper portion of reactor is connected with formaldehyde line, sodium hydroxide line and feed line, the reactor is equipped with outward and presss from both sides the cover, and reactor outer wall and cover form the accuse temperature chamber, and steam temperature rising line and salt solution cooling line respectively with the entry linkage in accuse temperature chamber, the export in accuse temperature chamber is connected with steam condensate line and salt solution return water line respectively, is equipped with the agitator in the reactor, and the bottom of reactor is connected with the circulation line through the circulating pump, and the circulation line is connected with the upper portion feed inlet of reactor, is equipped with the circulating valve on the circulation line, is connected with out the material line on the circulation line. The utility model discloses an add cooling line and can effectively prevent the reactor overtemperature accident, adopt agitator and forced reflux technique simultaneously, can effectively improve the mobile state of medium in the reactor, simultaneously through replenishing the sodium hydroxide catalysis and replenishing the formaldehyde as the technique of reaction raw materials, can optimize acetonitrile product quality.

Description

Temperature control system of acetonitrile reactor

Technical Field

The utility model belongs to the technical field of the acetonitrile is refined, concretely relates to acetonitrile reactor temperature control system.

Background

The production process of acrylonitrile mostly adopts propylene, ammonia and air oxidation methods, and the raw materials of propylene, ammonia and air generate acrylonitrile, hydrocyanic acid, acetonitrile, acrolein, acetone, water and other products under the action of a molybdenum-bismuth catalyst. The purity of the generated byproduct acetonitrile is low, and the acetonitrile is required to pass through an acetonitrile refining unit to remove impurities such as acrylonitrile, hydrocyanic acid and the like in the acetonitrile, so that the standard of national high-grade products is reached.

At present, domestic acetonitrile refining plant all adds alkali messenger hydrocyanic acid and acrylonitrile copolymerization or auto-agglutination in the acetonitrile reactor, thereby desorption these two kinds of impurity, polymerization is exothermic reaction, the reaction process is producing a large amount of heats, however, the temperature control of acetonitrile reactor, only heat up heating system, do not have cooling system, the in-process of desorption impurity can't effectively be cooled down, cause high temperature to gather suddenly easily, especially the high condition of summer outdoor temperature, the temperature is difficult to control, not only can cause the decline of acetonitrile yield, still very big potential safety hazard, so develop an effective acetonitrile reactor temperature control system very necessary.

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 temperature control system of the acetonitrile reactor is provided, the reactor can be effectively prevented from being in an overtemperature or low-temperature state, the loss of acetonitrile products is avoided, and safety accidents are prevented.

The utility model discloses an adopt following technical scheme to realize:

acetonitrile reactor temperature control system, including the reactor, the upper portion of reactor is connected with formaldehyde line, sodium hydroxide line and feed line, the reactor is equipped with outward and presss from both sides the cover, reactor outer wall and cover formation accuse temperature chamber, steam temperature rising line and salt solution cooling line respectively with the entry linkage in accuse temperature chamber, the export in accuse temperature chamber is connected with steam condensate line and salt solution return water line respectively, be equipped with the agitator in the reactor, the bottom of reactor is connected with the circulation line through the circulating pump, the circulation line is connected with the upper portion feed inlet of reactor, be equipped with the circulating valve on the circulation line, be connected with out the stockline on the circulation line.

Preferably, a plurality of guide rings are uniformly arranged in the temperature control cavity, so that the heat medium or the refrigerant is transferred more uniformly, and the temperature is controlled more easily.

Preferably, be equipped with the intensification valve on the steam intensification line, be equipped with the cooling valve on the salt solution cooling line, install temperature sensor on the reactor, intensification valve and cooling valve all are connected with temperature sensor electricity.

Preferably, a condensate valve is arranged on the steam condensate line, and a water return valve is arranged on the brine return line.

Preferably, the stirrer comprises a stirring shaft, one end of the stirring shaft is in transmission connection with a motor at the top of the reactor, and the stirring shaft is sequentially provided with a plurality of layers of stirring paddles and anchor type stirring rods from top to bottom.

Preferably, a circulation subline is arranged on the circulation line, the circulation subline is connected with the circulation valve in parallel, a subline valve, a subline flowmeter and a heat exchanger are arranged on the circulation subline, and the temperature of the material in the reactor can be directly adjusted through the heat exchanger on the circulation subline, so that the temperature of the material in the reactor can be further adjusted and controlled more easily.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses an add the cooling line and can effectively prevent the reactor overtemperature accident, adopt agitator and forced reflux technique simultaneously, can effectively improve the mobile state of medium in the reactor.

2. The utility model discloses a supplement the technique of sodium hydroxide catalysis and supplement formaldehyde as reaction raw materials, can optimize acetonitrile product quality.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure: 1. a reactor; 2. formaldehyde line; 3. a sodium hydroxide wire; 4. a motor; 5. a feed line; 6. a stirring shaft; 7. a stirring paddle; 8. an anchor type stirring rod; 9. a jacket; 10. a temperature control cavity; 11. a flow guide ring; 12. a circulation pump; 13. a circulating line; 14. discharging the material line; 15. circulating the secondary line; 16. a secondary line valve; 17. a secondary line flow meter; 18. a heat exchanger; 19. a circulation valve; 20. a steam temperature rise line; 21. a saline cooling line; 22. a temperature rising valve; 23. a temperature reducing valve; 24. a temperature sensor; 25. a vapor condensate line; 26. a brine return line; 27. a condensate valve; 28. a water return valve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, the temperature control system of the acetonitrile reactor comprises a reactor 1, wherein the upper part of the reactor 1 is connected with a formaldehyde line 2, a sodium hydroxide line 3 and a feeding line 5, a jacket 9 is arranged outside the reactor 1, a temperature control cavity 10 is formed by the outer wall of the reactor 1 and the jacket 9, a steam temperature rising line 20 and a brine temperature lowering line 21 are respectively connected with an inlet of the temperature control cavity 10, an outlet of the temperature control cavity 10 is respectively connected with a steam condensate line 25 and a brine return line 26, a stirrer is arranged in the reactor 1, the bottom of the reactor 1 is connected with a circulation line 13 through a circulation pump 12, the circulation line 13 is connected with an upper feeding port of the reactor 1, a circulation valve 19 is arranged on the circulation line 13, and a discharging line 14 is connected on the circulation line 13.

A plurality of guide rings 11 are uniformly arranged in the temperature control cavity 10.

The steam temperature rising line 20 is provided with a temperature rising valve 22, the brine temperature lowering line 21 is provided with a temperature lowering valve 23, the reactor 1 is provided with a temperature sensor 24, and the temperature rising valve 22 and the temperature lowering valve 23 are both electrically connected with the temperature sensor 24. A condensate valve 27 is arranged on the steam condensate line 25, and a return valve 28 is arranged on the brine return line 26.

The agitator includes (mixing) shaft 6, and the one end of (mixing) shaft 6 is connected with the motor 4 transmission at 1 top of reactor, the (mixing) shaft 6 is equipped with two-layer six oblique leaf from last to opening turbine stirring rake 7 and anchor formula puddler 8 down in proper order.

A circulation subline 15 is arranged on the circulation line 13, the circulation subline 15 is arranged in parallel with a circulation valve 19, and a subline valve 16, a subline flowmeter 17 and a heat exchanger 18 are arranged on the circulation subline 15.

The method comprises the steps of introducing a glycol aqueous solution with the temperature of-5 ℃ into a saline cooling line 21 as a cold source of an acetonitrile reactor 1, introducing steam with the pressure of 0.3MPa into a steam heating line 20 as a heat source of the acetonitrile reactor 1, pumping raw materials into the reactor 1 from a feed line 5, adding formaldehyde and sodium hydroxide, introducing steam with the pressure of 0.3MPa into a temperature control cavity 10 to heat up for reaction, closing a heating valve 22 when the temperature of the reactor 1 rises to a set value, opening a cooling valve 23 to introduce a glycol aqueous solution with the temperature of-5 ℃ to cool, performing circulating reflux on the reactor 1 under the action of a circulating pump 12 during reaction, and opening an auxiliary line valve 16 on a circulating auxiliary line 15 when the temperature of reaction liquid in the reactor 1 needs to be regulated and controlled to regulate and control the temperature of the reaction liquid through a heat exchanger 18 so as to achieve the purpose of regulating and controlling the temperature of the reactor 1.

Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.

Claims (7)

1. The utility model provides an acetonitrile reactor temperature control system which characterized in that: the device comprises a reactor (1), wherein the upper part of the reactor (1) is connected with a formaldehyde line (2), a sodium hydroxide line (3) and a feeding line (5), a jacket (9) is arranged outside the reactor (1), the outer wall of the reactor (1) and the jacket (9) form a temperature control cavity (10), a steam heating line (20) and a brine cooling line (21) are respectively connected with an inlet of the temperature control cavity (10), an outlet of the temperature control cavity (10) is respectively connected with a steam condensate line (25) and a brine return line (26), a stirrer is arranged in the reactor (1), the bottom of the reactor (1) is connected with a circulating line (13) through a circulating pump (12), the circulating line (13) is connected with an upper feeding port of the reactor (1), a circulating valve (19) is arranged on the circulating line (13), and a discharging line (14) is connected onto the circulating line (13).

2. The acetonitrile reactor temperature control system of claim 1, wherein: a plurality of flow guide rings (11) are uniformly arranged in the temperature control cavity (10).

3. The acetonitrile reactor temperature control system of claim 1, wherein: a temperature rising valve (22) is arranged on the steam temperature rising line (20), a temperature reducing valve (23) is arranged on the brine temperature reducing line (21), and a temperature sensor (24) is arranged on the reactor (1).

4. The acetonitrile reactor temperature control system of claim 3, wherein: the temperature rising valve (22) and the temperature reducing valve (23) are both electrically connected with the temperature sensor (24).

5. Acetonitrile reactor temperature control system according to claim 1 or 3, wherein: a condensate valve (27) is arranged on the steam condensate line (25), and a return valve (28) is arranged on the brine return line (26).

6. The acetonitrile reactor temperature control system of claim 1, wherein: the agitator includes (mixing) shaft (6), and the one end of (mixing) shaft (6) is connected with motor (4) transmission at reactor (1) top, (mixing) shaft (6) are from last to being equipped with multilayer stirring rake (7) and anchor formula puddler (8) down in proper order.

7. The acetonitrile reactor temperature control system of claim 1, wherein: a circulating secondary line (15) is arranged on the circulating line (13), the circulating secondary line (15) and the circulating valve (19) are arranged in parallel, and a secondary line valve (16), a secondary line flowmeter (17) and a heat exchanger (18) are arranged on the circulating secondary line (15).

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