CN218077214U

CN218077214U - Phosphine gas purification system

Info

Publication number: CN218077214U
Application number: CN202221799378.9U
Authority: CN
Inventors: 张保义; 王东; 周勇; 张志祥; 黄权; 张清华; 吕杨
Original assignee: Hubei Jixing Chemical Industry Group Corp ltd
Current assignee: Hubei Jixing Chemical Industry Group Corp ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-12-20
Anticipated expiration: 2032-07-13

Abstract

The utility model discloses a phosphine gas purification and purification system, including water seal tank and the phosphine pipeline that admits air with the water seal tank intercommunication, phosphine pipeline end that admits air stretches into below the water seal tank internal liquid level, water seal tank top gas outlet is through first pipeline and alkaline washing tower inside wall inlet end intercommunication, is equipped with the fan leaf above the alkaline washing tower inside wall inlet end, the fan leaf is installed in the pivot surface, the pivot bottom is connected with the scraper blade, is equipped with a plurality of shower heads above the fan leaf, the shower head passes through liquid caustic soda circulation pipeline and communicates with alkaline washing tower bottom, and alkaline washing tower top is connected with phosphine cabinet inlet end through the second pipeline that admits air, and phosphine cabinet outlet end passes through the pipeline and is connected with fire retardant device import; a large amount of elemental phosphorus in phosphine gas reacts with a sodium hydroxide solution through tower type forced circulation alkali washing, so that the purposes of removing impurities and stabilizing the quality of a flame retardant product are achieved, and the produced product is ensured to meet the requirements of customer standards.

Description

Phosphine gas purification system

Technical Field

The utility model relates to a sodium hypophosphite accessory substance hydrogen phosphide gas technical field specifically indicates a hydrogen phosphide gas body purifies purification system.

Background

In the production process of the existing flame retardant product, a glass lining reaction kettle (hereinafter referred to as a circulating kettle) is used for circulating absorption. The materials are led into a circulating kettle to be reversely synthesized and absorbed by phosphine to generate a tetrakis hydroxymethyl phosphonium sulfate (hereinafter referred to as a flame retardant) product. And (4) filling the product after evaporating and repeatedly and continuously filtering the fire retardant. However, phosphine is also a byproduct after the reaction process, and the content of elemental phosphorus contained in phosphine in different periods is uncertain, so that partial products have a yellow condition, and common filtering equipment cannot completely filter and remove phosphine, so that the product quality is unstable. Through long-term experimental analysis, the phosphine gas contains a certain amount of simple substance phosphorus, and the simple substance phosphorus reacts with other raw materials to generate yellow compounds, so that the color of the product is changed. Therefore, it is necessary to design a phosphine gas purification system to solve the above problems.

Disclosure of Invention

An object of the utility model is to overcome the aforesaid not enough, provide a phosphine gas purification system, wash with alkaline through tower forced circulation, make a large amount of simple substance phosphorus in the phosphine gas and sodium hydroxide solution take place to react, reach and get rid of impurity, stabilize fire retardant product quality's purpose, ensure that the production product satisfies customer standard requirement.

The utility model discloses a solve above-mentioned technical problem, the technical scheme who adopts is: the utility model provides a hydrogen phosphide gas purifies purification system, includes water seal tank and the hydrogen phosphide pipeline of admitting air that communicates with water seal tank, hydrogen phosphide pipeline end of admitting air stretches into water seal tank internal liquid level below, water seal tank top gas outlet is through first pipeline and alkaline tower inside wall inlet end intercommunication, and alkaline tower inside wall inlet end top is equipped with the fan leaf, the fan leaf is installed in the pivot surface, the pivot bottom is connected with the scraper blade, and fan leaf top is equipped with a plurality of showerheads, the shower head passes through liquid caustic soda circulation pipeline and alkaline tower bottom intercommunication, and alkaline tower top is connected with hydrogen phosphide cabinet inlet end through the second pipeline that admits air, and hydrogen phosphide cabinet gives vent to anger the end and passes through pipeline and flame retardant device access connection.

Preferably, the first air inlet pipeline is communicated with the outer side of an annular pipe arranged on the inner side wall of the alkaline tower, the inner side of the annular pipe is communicated with one ends of a plurality of dispersion pipes, a plurality of air nozzles are arranged at the upper ends of the dispersion pipes, and fan blades are arranged above the air nozzles.

Preferably, the top of the rotating shaft is rotatably connected with the middle of the connecting rod through a bearing, and two ends of the connecting rod are fixedly connected with the inner side wall of the alkaline washing tower.

Preferably, the bottom of the scraper is also provided with bristles.

Preferably, a liquid caustic soda replenishing pipeline and a circulating pump are arranged on the liquid caustic soda circulating pipeline, and a valve is arranged on the liquid caustic soda replenishing pipeline.

Preferably, a sewage discharge pipeline is arranged at the bottom of the alkaline washing tower, and a valve is arranged on the sewage discharge pipeline.

The utility model has the advantages that:

1) The utility model discloses an alkaline washing tower adopts tower equipment, combines the fan leaf can effectively reduce the velocity of flow of hydrogen phosphide gas, makes the abundant sodium hydroxide emergence reaction of phosphorus in the hydrogen phosphide gas.

2) The utility model discloses a tower forced circulation alkali wash makes a large amount of simple substance phosphorus and sodium hydroxide solution in the phosphine gas react, reaches and gets rid of impurity, stabilizes fire retardant product quality's purpose, ensures that the production product satisfies customer standard requirement.

3) The utility model discloses a process route realizes twice edulcoration purification process, once realizes washing through the water-sealed tank, and another time carries out the alkali wash through the caustic wash tower, realizes phosphine's purification and purification, as the raw materials production fire retardant of low reaches product.

4) The utility model discloses a fan leaf can effectively utilize the impetus of admitting air to realize rotating the process to make the scraper blade of bottom rotate thereupon, can effectively prevent like this that the crystallization of alkali wash tower bottom from adhering to, be favorable to the blowdown process in later stage.

Drawings

FIG. 1 is a schematic view showing the construction of a phosphine gas purification system;

fig. 2 is an enlarged schematic structural view of the region where the fan blades are located in fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the drawings and specific embodiments.

As shown in fig. 1 and 2, a phosphine gas purification system comprises a water-sealed tank 1 and a phosphine gas inlet pipeline 2 communicated with the water-sealed tank 1, wherein the tail end of the phosphine gas inlet pipeline 2 extends to the lower part of the liquid level in the water-sealed tank 1, a gas outlet at the top of the water-sealed tank 1 is communicated with a gas inlet end on the inner side wall of an alkaline tower 4 through a first gas inlet pipeline 3, a fan blade 8 is arranged above the gas inlet end on the inner side wall of the alkaline tower 4, the fan blade 8 is arranged on the surface of a rotating shaft 9, the bottom of the rotating shaft 9 is connected with a scraper 10, a plurality of spray heads 13 are arranged above the fan blade 8, the spray heads 13 are communicated with the bottom of the alkaline tower 4 through a liquid caustic soda circulating pipeline 14, the top of the alkaline tower 4 is connected with a gas inlet end of a phosphine gas cabinet 16 through a second gas inlet pipeline 15, and the gas cabinet 16 gas outlet end of the phosphine gas cabinet is connected with an inlet of a flame retardant device through a pipeline.

Preferably, the first air inlet pipeline 3 is communicated with the outer side of an annular pipe 5 arranged on the inner side wall of the alkaline washing tower 4, the inner side of the annular pipe 5 is communicated with one end of a plurality of dispersion pipes 6, a plurality of air nozzles 7 are arranged at the upper ends of the dispersion pipes 6, and fan blades 8 are arranged above the air nozzles 7. After the design, the gas entering through the first gas inlet pipeline 3 firstly enters the annular pipe 5 and then is upwards sprayed out from the gas nozzles 7 of the plurality of dispersion pipes 6, the airflow can push the fan blades 8 to rotate in the ascending process, so that the rotating shaft 9 is driven to rotate, and finally the scraping plate 10 at the bottom can rotate along with the rotation of the fan blades, so that the crystal adhesion at the bottom of the alkaline tower 4 can be effectively prevented, and the later-stage pollution discharge process is facilitated; meanwhile, in the process of rising the airflow, a large amount of elemental phosphorus in the phosphine gas is mixed with the liquid alkali sprayed by the spray header 13 to react, so that the effects of impurity removal and purification are achieved; in addition, when the gas passes through the fan blades 8, the gas flow velocity is slowed down and reduced, so that the reaction between the elemental phosphorus in the phosphine gas and the sodium hydroxide solution is facilitated, and the purification efficiency is improved.

Preferably, the top of the rotating shaft 9 is rotatably connected with the middle of a connecting rod 12 through a bearing 11, and two ends of the connecting rod 12 are fixedly connected with the inner side wall of the alkaline tower 4. The rotation process of the rotating shaft 9 is more smooth by installing the bearing 11.

Preferably, the bottom of the scraper 10 is also provided with bristles 17. By arranging the brush bristles 17, fine crystals adhered to the bottom of the alkaline washing tower 4 can be scraped more easily, and the scraping efficiency of the scraper 10 is improved.

Preferably, a liquid caustic soda make-up pipeline 18 and a circulating pump 20 are arranged on the liquid caustic soda circulating pipeline 14, and a valve is arranged on the liquid caustic soda make-up pipeline 18. The liquid caustic soda is pumped into the shower head 13 through the circulating pump 20, and when phosphorus impurities in the gas are circularly absorbed, a certain loss exists, so that the liquid caustic soda can be supplemented into the gas caustic soda through the liquid caustic soda supplementing pipeline 18.

Preferably, a drain line 19 is arranged at the bottom of the alkaline tower 4, and a valve is arranged on the drain line 19. By opening a valve on the blowdown line 19, the soil at the bottom of the caustic tower 4 can be drained.

The working principle of the embodiment is as follows:

in the embodiment, phosphine gas is firstly introduced into the water-sealed tank 1, is purified by washing once to remove impurities, then enters the first air inlet pipeline 3 from an air outlet at the top of the water-sealed tank 1, the gas entering the first air inlet pipeline 3 firstly enters the annular pipe 5, and then is upwards sprayed out from the air nozzles 7 of the plurality of dispersion pipes 6, and the air flow of the gas can push the fan blades 8 to rotate in the ascending process, so that the rotating shaft 9 is driven to rotate, and finally the scraper plate 10 at the bottom can rotate along with the rotating shaft, so that the crystal adhesion at the bottom of the alkaline washing tower 4 can be effectively prevented, and the later-stage pollution discharge process is facilitated; meanwhile, in the process of rising the airflow, a large amount of elemental phosphorus in the phosphine gas is mixed with the liquid alkali sprayed by the spray header 13 to react, so that the effects of impurity removal and purification are achieved; in addition, when the gas passes through the fan blades 8, the gas flow speed is slowed down and reduced, so that the reaction of elemental phosphorus in the phosphine gas and the sodium hydroxide solution is facilitated, and the purification efficiency is improved; the purified phosphine gas comes out from the top of the alkaline washing tower 4 and enters a phosphine gas cabinet 16 through a second gas inlet pipeline 15 to be stored, and the phosphine gas cabinet can be used as a raw material of downstream products to produce a flame retardant. In addition, after a period of time, impurities or crystals accumulated at the bottom of the alkaline tower 4 need to be cleaned, at the moment, a valve on the sewage discharge pipeline 19 can be opened, dirt at the bottom of the alkaline tower 4 is directly discharged, and due to the rotation process of the scraper 10, the dirt is not attached to the bottom and is easily and directly discharged from the sewage discharge pipeline 19.

The above embodiments are merely preferred technical solutions of the present invention, and should not be considered as limitations of the present invention, and the features in the embodiments and the examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be defined by the claims and the equivalents of the technical features in the claims. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.

Claims

1. The utility model provides a hydrogen phosphide gas purifies purification system, includes water-sealed tank (1) and phosphine intake line (2) with water-sealed tank (1) intercommunication, phosphine intake line (2) end stretches into liquid level below in water-sealed tank (1), its characterized in that: the air outlet at the top of the water seal tank (1) is communicated with the air inlet end of the inner side wall of an alkaline washing tower (4) through a first air inlet pipeline (3), a fan blade (8) is arranged above the air inlet end of the inner side wall of the alkaline washing tower (4), the fan blade (8) is arranged on the surface of a rotating shaft (9), the bottom of the rotating shaft (9) is connected with a scraper (10), a plurality of spray heads (13) are arranged above the fan blade (8), the spray heads (13) are communicated with the bottom of the alkaline washing tower (4) through a liquid alkali circulating pipeline (14), the top of the alkaline washing tower (4) is connected with the air inlet end of a phosphine gas cabinet (16) through a second air inlet pipeline (15), and the air outlet end of the phosphine gas cabinet (16) is connected with the inlet of a flame retardant device through a pipeline.

2. The phosphine gas purification system according to claim 1, wherein: annular pipe (5) outside intercommunication of first pipeline (3) and alkaline tower (4) inside wall installation that admits air, annular pipe (5) inboard and a plurality of dispersion pipes (6) one end intercommunication, dispersion pipe (6) upper end is equipped with a plurality of air jets (7), and air jet (7) top sets up fan leaf (8).

3. The phosphine gas purification system according to claim 1 or 2, wherein: the top of the rotating shaft (9) is rotatably connected with the middle of a connecting rod (12) through a bearing (11), and two ends of the connecting rod (12) are fixedly connected with the inner side wall of the alkaline washing tower (4).

4. The phosphine gas purification system according to claim 1, wherein: the bottom of the scraper (10) is also provided with bristles (17).

5. The phosphine gas purification system according to claim 1, wherein: the liquid caustic soda circulating pipeline (14) is provided with a liquid caustic soda replenishing pipeline (18) and a circulating pump (20), and the liquid caustic soda replenishing pipeline (18) is provided with a valve.

6. The phosphine gas purification system according to claim 1, wherein: and a sewage discharge pipeline (19) is arranged at the bottom of the alkaline washing tower (4), and a valve is arranged on the sewage discharge pipeline (19).