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Hydrogen sulfide acidic water purification method based on side line and tower kettle reflux ratio control

A hydrogen sulfide and acidic water technology, applied in chemical instruments and methods, separation methods, distillation adjustment/control, etc., can solve the problem of increasing the load of the condenser at the top of the tower and the reboiler at the bottom of the tower, and less consideration of the high-temperature water purification energy The impact of energy consumption, the increase of heating steam, etc., to achieve the effect of reducing operating costs of stripping, low load, and reducing equipment costs

Active Publication Date: 2020-04-17
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the sour water stripping process used in industry usually adopts the method of steam heating, in which the operating pressure at the top of the tower is about 1 atm, and the overhead distillate is discharged in the form of high-temperature steam, so when cooling to the target temperature, the required tower The load of the top condenser has increased, and the amount of heated water vapor required to achieve the same separation requirements has also increased, thereby increasing the operating cost; and the existing sour water stripping process rarely considers the direct discharge of high-temperature purified water The impact on the energy consumption of the stripping tower. The high-temperature purified water in the bottom of the tower itself contains extremely high-purity water and a certain amount of heat. If it is discharged directly, it will cause heat loss in the stripping tower, which will further increase the load on the top condenser and the tower. Kettle reboiler duty increased

Method used

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  • Hydrogen sulfide acidic water purification method based on side line and tower kettle reflux ratio control
  • Hydrogen sulfide acidic water purification method based on side line and tower kettle reflux ratio control
  • Hydrogen sulfide acidic water purification method based on side line and tower kettle reflux ratio control

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Embodiment 1

[0032] like figure 2 As shown, a hydrogen sulfide acidic water purification method based on the control of the reflux ratio of the side line and the tower bottom, the mass concentration is 1% hydrogen sulfide-containing acidic water according to the flow rate L f 4200kg / h is passed into the rectifying tower 1, specifically acidic water containing hydrogen sulfide (the temperature is 90°C, the pressure is 0.12Mpa, the feed heat condition parameter q is 1.01, and the enthalpy of vaporization r is 2240.9kJ / kg) from the refined Distillation column No. 6 # Tray plate is passed into, water vapor (temperature is 120 ℃, pressure is 0.11MPa) from the 20th rectification column through inlet pipeline 5 # The tray (the number of trays in the separation process of the rectification tower is 20) is introduced; the water vapor flow rate entering the tower kettle is 4076kg / h; The operating pressure of the still is 0.11MPa; the product flow L after being condensed by the total condenser 2 o...

Embodiment 2

[0037] like figure 2 Shown, a kind of hydrogen sulfide acidic water purification method based on side line and tower bottom reflux ratio control, mass concentration is 5% hydrogen sulfide acidic water (containing hydrogen sulfide acidic water hydrogen sulfide mass concentration is 5%) according to flow L f 4500kg / h is passed into rectification tower 1, specifically, acidic water containing hydrogen sulfide (temperature is 90°C, pressure is 0.12Mpa, feed thermal condition parameter q is 1.27, enthalpy of vaporization r is 2257.1kJ / kg) Distillation Column No. 9 # Tray, water vapor (temperature is 120 ℃, pressure is 0.11MPa) into the 23rd rectification column # Tray (the number of trays in the separation process of the rectification tower is 23); during the rectification extraction process, the operating pressure at the top of the tower is 0.11MPa, and the operating pressure at the bottom of the tower is 0.15MPa; L d It is 196kg / h, and the water vapor flow rate that enters to...

Embodiment 3

[0042] like figure 2 Shown, a kind of hydrogen sulfide acidic water purification method based on side line and tower still reflux ratio control, mass concentration is 10% hydrogen sulfide-containing acidic water (hydrogen sulfide mass concentration in acidic water containing hydrogen sulfide is 10%) according to flow L f 5600kg / h is passed into rectification tower 1, specifically, acidic water containing hydrogen sulfide (temperature is 90°C, pressure is 0.12Mpa, feed thermal condition parameter q is 0.93, enthalpy of vaporization r is 2186.3kJ / kg) Distillation Column No. 12 # Tray, water vapor (temperature is 120 ℃, pressure is 0.11MPa) into the 30th rectification column # Plates (the number of plates in the separation process of the rectification tower is 30); during the rectification extraction process, the operating pressure at the top of the tower is 0.13MPa, and the operating pressure at the bottom of the tower is 0.17MPa; L d It is 325kg / h, and the water vapor flow ...

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Abstract

The invention discloses a hydrogen sulfide acidic water purification method based on side line and tower kettle reflux ratio control. The method comprises the following steps: introducing hydrogen sulfide-containing acidic water into a rectifying tower through a first mixer, and introducing water vapor into the rectifying tower from a gas inlet pipeline; connecting a side line discharge port to the other feed port of a second mixer through a pipeline, wherein the reflux flow percentage of the discharge of the side line discharge port and the tower kettle passing through the second mixer is 36%-42%; conveying a mixture flow flowing through the second mixer by a centrifugal pump into the first mixer, and introducing the mixture flow and the hydrogen sulfide-containing acidic water to the rectifying tower through the first mixer to realize continuous purification of the hydrogen sulfide-containing acidic water. According to the invention, the purified water recovery quality can be improved, the problem of large reboiler load in the purified water recovery process can be solved, zero discharge of acidic water is realized, the energy consumption is reduced, the cost is saved, the environmental pollution is reduced, and the method has the characteristics of high accuracy, rapidness, sensitivity, convenience and the like, and is easy for industrial implementation.

Description

[0001] field of invention [0002] The invention relates to the field of hydrogen sulfide acidic water purification technology, in particular to a method for purifying hydrogen sulfide acidic water based on the control of the reflux ratio of side line and tower kettle. Background technique [0003] Hydrogen sulfide is an important chemical raw material, mainly used in the manufacture of synthetic phosphors, photoconductors, and photoelectric exposure meters, and can also be used in metal refining, pesticides, medicine, and catalyst regeneration. In addition, hydrogen sulfide is also used in chemical analysis such as identification of metal ions. In the process of crude oil processing, some acidic water will be produced, such as acidic water in hydrocracking unit, acidic water in fractionating tower of reforming hydrogenation unit, condensate water in fractionating tower of heavy oil catalytic cracking unit, rich gas scrubbing in coking unit Water, acidic water at the top of t...

Claims

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Application Information

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IPC IPC(8): C02F1/04B01D3/42C02F101/10
CPCB01D3/42B01D3/4205C02F1/04C02F2101/101C02F2303/10
Inventor 江燕斌叶志光彭威建杨守红谭泽
Owner SOUTH CHINA UNIV OF TECH