A purification device for carbon disulfide crude

Abstract

A kind of purification device of carbon disulfide crude product, including rectifying tower, primary, secondary, tertiary condenser, cyclone separator, hydrogen sulfide buffer tank, hydrogen sulfide compressor, the feed inlet of rectifying tower is used to be connected with the source of crude carbon disulfide, the exhaust port of rectifying tower is connected with cyclone separator via primary, second, tertiary condenser, the liquid outlet of primary, secondary, tertiary condenser is connected with carbon disulfide finished product tank respectively, the discharge port of cyclone separator top is connected with the upstream end of hydrogen sulfide compressor via hydrogen sulfide buffer tank, the discharge port of cyclone separator bottom is connected with carbon disulfide buffer tank via first pipeline, first valve is arranged on first pipeline, the carbon disulfide buffer tank is connected with nitrogen source, the bottom of carbon disulfide buffer tank is connected with carbon disulfide finished product tank by second pipeline, second valve is arranged on second pipeline.The present application has the advantages of simple structure, low maintenance cost, can efficiently purify carbon disulfide crude product, avoid waste carbon disulfide or environmental pollution.

Description

TECHNICAL FIELD

[0001] The present application relates to the chemical industry, in particular to a kind of carbon disulfide crude purification device. BACKGROUND

[0002] The carbon disulfide crude obtained by chemical enterprise production needs to be purified to obtain high-purity carbon disulfide product.

[0003] The carbon disulfide crude purification process is that the crude carbon disulfide (liquid) is heated into gaseous state by heater in the rectifying column, then the carbon disulfide product is obtained by condensation recovery, and the part of gaseous carbon disulfide which is not completely recovered and the by-product hydrogen sulfide enter the hydrogen sulfide buffer tank to form carbon disulfide accumulation liquid, which enters the hydrogen sulfide compressor with hydrogen sulfide gas, and easily gathers in the compressor oil pool, which causes the hydrogen sulfide compressor oil pressure to be unstable and unable to operate normally, and causes the waste of carbon disulfide product. SUMMARY

[0004] The present application aims at the deficiencies of the prior art, and provides a carbon disulfide crude purification device, which has simple structure, low maintenance cost, can efficiently purify carbon disulfide crude, and avoids waste of carbon disulfide or environmental pollution.

[0005] The technical scheme of the present application is a carbon disulfide crude purification device, which comprises a rectifying column, a first condenser, a second condenser, a third condenser, a cyclone separator, a hydrogen sulfide buffer tank, a hydrogen sulfide compressor, the feed inlet of the rectifying column is connected with a crude carbon disulfide source, the exhaust port of the rectifying column is connected with the feed inlet of the cyclone separator through the first condenser, the second condenser and the third condenser, the liquid outlets of the first condenser, the second condenser and the third condenser are respectively connected with carbon disulfide product tanks, the discharge port at the top of the cyclone separator is connected with the upstream end of the hydrogen sulfide compressor through the hydrogen sulfide buffer tank, the discharge port at the bottom of the cyclone separator is connected with a carbon disulfide buffer tank through a first pipeline, a first valve is arranged on the first pipeline, the carbon disulfide buffer tank is connected with a nitrogen source, the bottom of the carbon disulfide buffer tank is connected with the carbon disulfide product tank through a second pipeline, and a second valve is arranged on the second pipeline.

[0006] Further, the downstream end of the hydrogen sulfide compressor is connected with a Claus device.

[0007] Preferably, the condensation temperature of the third condenser is 4-6 ℃.

[0008] Preferably, steam is used as heat source at the bottom of the rectifying column.

[0009] Further, the bottom of the hydrogen sulfide buffer tank is connected with the carbon disulfide buffer tank through a third pipeline, and a third valve is arranged on the third pipeline.

[0010] Further, the cooling medium channels of the first condenser and the second condenser are connected with the crude carbon disulfide source through a first circulating pipeline and a second circulating pipeline respectively, and a first delivery pump is arranged on the first circulating pipeline, and a second delivery pump is arranged on the second circulating pipeline.

[0011] The above technical scheme has the following beneficial effects:

[0012] 1. A purification device for carbon disulfide crude product, comprising a rectifying tower, a first-stage condenser, a second-stage condenser, a third-stage condenser, a cyclone separator, a hydrogen sulfide buffer tank, and a hydrogen sulfide compressor, wherein the rectifying tower is used for rectifying carbon disulfide crude product, the first-stage condenser, the second-stage condenser, and the third-stage condenser are used for condensing and separating the gas phase discharged from the rectifying tower, and the cyclone separator is used for separating the gas phase preliminarily separated by the condenser. The feed inlet of the rectifying tower is connected with a carbon disulfide crude product source, the exhaust outlet of the rectifying tower is connected with the feed inlet of the cyclone separator through the first-stage condenser, the second-stage condenser, and the third-stage condenser, the main component in the gas phase discharged from the rectifying tower is gaseous carbon disulfide, and a small amount of gaseous hydrogen sulfide, the gaseous carbon disulfide and the gaseous hydrogen sulfide are cooled in the first-stage condenser, the second-stage condenser, and the third-stage condenser, and the temperature is reduced, since the boiling point of carbon disulfide is 46.5℃ and the boiling point of hydrogen sulfide is -60.4℃, most of the gaseous carbon disulfide in the gas phase is condensed into liquid, and the hydrogen sulfide in the gas phase remains gaseous, thus completing preliminary separation, the liquid outlets of the first-stage condenser, the second-stage condenser, and the third-stage condenser are respectively connected with carbon disulfide product tanks, and the carbon disulfide preliminarily separated in the condenser flows to the carbon disulfide product tanks under the action of gravity and is stored. The exhaust outlet at the top of the cyclone separator is connected with the upstream end of the hydrogen sulfide compressor through the hydrogen sulfide buffer tank, and the exhaust outlet at the bottom of the cyclone separator is connected with a carbon disulfide buffer tank through a first pipeline, a first valve is arranged on the first pipeline, the carbon disulfide buffer tank is connected with a nitrogen source, the main component in the gas phase discharged from the third-stage condenser is gaseous hydrogen sulfide, and a small amount of misty (small-particle liquid beads) carbon disulfide, after the gas phase enters the cyclone separator, it spirally moves around the cyclone separator, the misty (small-particle liquid beads) carbon disulfide therein continuously collides and coalesces into large liquid beads, adheres to the inner wall of the cyclone separator, and moves downward under the action of gravity to flow into the carbon disulfide buffer tank through the first pipeline, and the gaseous hydrogen sulfide therein is directly discharged from the top, slows down in the hydrogen sulfide buffer tank, enters the hydrogen sulfide compressor for compression, and is then concentrated and treated again, thus completing secondary separation, effectively recovering carbon disulfide in the carbon disulfide crude product, and effectively reducing the content of carbon disulfide entering the hydrogen sulfide compressor. The bottom of the carbon disulfide buffer tank is connected with the carbon disulfide product tank through a second pipeline, a second valve is arranged on the second pipeline, by closing the first valve, opening the second valve, and pressurizing the carbon disulfide buffer tank with the nitrogen source, the carbon disulfide liquid separated again is squeezed into the carbon disulfide product tank, and is combined with the carbon disulfide liquid preliminarily separated, thus obtaining carbon disulfide product with a purity of up to 99.9% or above.

[0013] 2. The bottom of the hydrogen sulfide buffer tank is connected with the carbon disulfide buffer tank through a third pipeline, a third valve is arranged on the third pipeline, and the gas phase discharged from the rectifying tower is subjected to preliminary separation and secondary separation, and most of the gas phase in the hydrogen sulfide buffer tank is hydrogen sulfide gas and a small amount of misty carbon disulfide, the misty carbon disulfide is gradually coalesced after deceleration, and is collected to the bottom of the hydrogen sulfide buffer tank under the action of gravity, and the collected carbon disulfide liquid is collected into the carbon disulfide buffer tank by opening the third valve, so that the carbon disulfide in the gas phase discharged from the rectifying tower can be fully recycled, the content of carbon disulfide entering the hydrogen sulfide compressor is further reduced, and the normal operation of the hydrogen sulfide compressor is effectively ensured.

[0014] 3. Cooling medium channels of the primary condenser and the secondary condenser are connected with the crude carbon disulfide source through first and second circulating pipelines, respectively, a first conveying pump is arranged on the first circulating pipeline, and a second conveying pump is arranged on the second circulating pipeline, the first and second conveying pumps are opened, the crude carbon disulfide with a lower temperature is used as a cooling medium, heat exchange is performed in the first and second condensers, respectively, the crude carbon disulfide is returned to the crude carbon disulfide source after being heated, and then enters the rectifying tower for rectification, so that the gas phase passing through the primary and secondary condensers is cooled, the temperature of the raw material entering the rectifying tower is effectively increased, and the energy consumption of the rectifying tower is effectively reduced.

[0015] Further description will be made in combination with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a connection diagram of the present application.

[0017] In the drawings, 1 is a rectifying tower, 2 is a primary condenser, 3 is a secondary condenser, 4 is a tertiary condenser, 5 is a cyclone separator, 6 is a hydrogen sulfide buffer tank, 7 is a hydrogen sulfide compressor, 8 is a crude carbon disulfide source, 9 is a carbon disulfide product tank, 10 is a carbon disulfide buffer tank, 11 is a nitrogen source, 12 is a Claus device, a is a first pipeline, a1 is a first valve, b is a second pipeline, b1 is a second valve, c is a third pipeline, c1 is a third valve, d is a first circulating pipeline, d1 is a first conveying pump, e is a second circulating pipeline, and e1 is a second conveying pump. DETAILED DESCRIPTION

[0018] In the present application, the devices without specific connection modes are usually operated according to conventional conditions or conditions recommended by manufacturers, and the devices without specific models are usually conventional devices in the chemical field.

[0019] Reference Figure 1The application discloses a carbon disulfide crude product purification device, which comprises a rectifying tower 1, a first-stage condenser 2, a second-stage condenser 3, a third-stage condenser 4, a cyclone separator 5, a hydrogen sulfide buffer tank 6, a hydrogen sulfide compressor 7, wherein the rectifying tower 1 is provided with a steam as a heat source at a tower bottom, and the first-stage condenser, the second-stage condenser and the third-stage condenser are all provided with plate heat exchangers.

[0020] The first-stage condenser 2, the second-stage condenser 3 and the third-stage condenser 4 are connected with the cyclone separator 5 through the first-stage condenser 2, the second-stage condenser 3 and the third-stage condenser 4 respectively, and the first-stage condenser 2, the second-stage condenser 3 and the third-stage condenser 4 are connected with a carbon disulfide product tank 9 through liquid outlets of the first-stage condenser 2, the second-stage condenser 3 and the third-stage condenser 4 respectively.

[0021] The working principle of the present application is that steam is used to provide heat for the rectifying tower, the first delivery pump and the second delivery pump are opened, the crude carbon disulfide in the crude carbon disulfide source is circulated between the first condenser, the crude carbon disulfide source and the second condenser, the crude carbon disulfide source and the third condenser is connected with a cooling medium, so that the condensing temperature of the third condenser is 4-6℃. The crude carbon disulfide in the crude carbon disulfide source enters the rectifying tower, after rectification, the main component of the gas phase discharged is gaseous carbon disulfide, and a small amount of gaseous hydrogen sulfide. The gaseous carbon disulfide and hydrogen sulfide are cooled in the first condenser, the second condenser and the third condenser, and the vast majority of gaseous carbon disulfide in the gas phase is condensed into liquid, and the hydrogen sulfide in the gas phase remains gaseous, so that the preliminary separation is completed. The carbon disulfide product obtained by preliminary separation in each condenser flows to the carbon disulfide product tank under the action of gravity and is stored. The main component of the gas phase discharged from the third condenser is gaseous hydrogen sulfide, and a small amount of misty (small particle liquid beads) carbon disulfide. The gas phase enters the cyclone separator and spirals around the cyclone separator, and the misty (small particle liquid beads) carbon disulfide in the gas phase collides and coalesces into large liquid beads, adheres to the inner wall of the cyclone separator, and moves downward under the action of gravity to collect, flows into the carbon disulfide buffer tank through the first pipeline, and effectively recovers the carbon disulfide in the carbon disulfide crude product and effectively reduces the content of carbon disulfide entering the hydrogen sulfide compressor. The gaseous hydrogen sulfide is directly discharged from the top, slows down in the hydrogen sulfide buffer tank, enters the hydrogen sulfide compressor for compression, and then is discharged to the Claus device to recover elemental sulfur. By closing the first valve, opening the second valve, and using the nitrogen source to pressurize the carbon disulfide buffer tank, the liquid carbon disulfide obtained by secondary separation is squeezed into the carbon disulfide product tank, and the liquid carbon disulfide obtained by preliminary separation is collected to obtain carbon disulfide product with a purity of more than 99.9%. Opening the third valve can transfer a small amount of liquid carbon disulfide generated when the hydrogen sulfide buffer tank is stopped to the carbon disulfide buffer tank for collection with the carbon disulfide product tank.

Claims

1. A method for purifying crude carbon disulfide, characterized in that: Purification is carried out using a purification device. The purification device includes a distillation column (1), a primary condenser (2), a secondary condenser (3), a tertiary condenser (4), a cyclone separator (5), a hydrogen sulfide buffer tank (6), and a hydrogen sulfide compressor (7). The feed inlet of the distillation column (1) is connected to the crude carbon disulfide source (8), and the exhaust port of the distillation column (1) is connected to the feed inlet of the cyclone separator (5) via a first-stage condenser (2), a second-stage condenser (3), and a third-stage condenser (4). The drain ports of the primary condenser (2), secondary condenser (3), and tertiary condenser (4) are respectively connected to the carbon disulfide finished product tank (9). The discharge port at the top of the cyclone separator (5) is connected to the upstream end of the hydrogen sulfide compressor (7) via a hydrogen sulfide buffer tank (6). The discharge port at the bottom of the cyclone separator (5) is connected to the carbon disulfide buffer tank (10) via a first pipe (a). A first valve (a1) is provided on the first pipe (a). The carbon disulfide buffer tank (10) is connected to a nitrogen source (11). The bottom of the carbon disulfide buffer tank (10) is connected to the carbon disulfide finished product tank (9) via a second pipe (b), and a second valve (b1) is provided on the second pipe (b). The cooling medium channels of the primary condenser (2) and the secondary condenser (3) are respectively connected to the crude carbon disulfide source (8) through the first circulation pipe (d) and the second circulation pipe (e). The first circulation pipe (d) is equipped with a first delivery pump (d1), and the second circulation pipe (e) is equipped with a second delivery pump (e1). Purification includes the following steps: 1) Use steam to provide heat to the distillation column, start the first and second transfer pumps to make the crude carbon disulfide in the crude carbon disulfide source circulate between the first-stage condenser and the crude carbon disulfide source, and circulate between the second ... 2) The crude carbon disulfide in the crude carbon disulfide source enters the distillation column. After distillation, the gaseous carbon disulfide and hydrogen sulfide are cooled down as they pass through the first-stage condenser, the second-stage condenser and the third-stage condenser, thus completing the initial separation. 3) The carbon disulfide products initially separated in each condenser are collected by gravity and stored in the carbon disulfide product tank; 4) After the gas phase enters the cyclone separator, it moves in a spiral motion around the cyclone separator. The mist-like carbon disulfide in it continuously collides and agglomerates into large liquid droplets, which adhere to the inner wall of the cyclone separator and move downward under the action of gravity, and flow into the carbon disulfide buffer tank through the first pipe. 5) Gaseous hydrogen sulfide is discharged directly from the top, slowed down in the hydrogen sulfide buffer tank, and then compressed in the hydrogen sulfide compressor before being discharged to the Claus unit to recover elemental sulfur. 6) By closing the first valve and opening the second valve, and by using a nitrogen source to pressurize the carbon disulfide buffer tank, the carbon disulfide liquid obtained after the second separation is squeezed into the carbon disulfide finished product tank, and then combined with the carbon disulfide liquid obtained in the initial separation to obtain the carbon disulfide finished product. 7) Opening the third valve can transfer a small amount of liquid carbon disulfide generated while it is in the hydrogen sulfide buffer tank to the carbon disulfide buffer tank for collection with the finished carbon disulfide tank.

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