SU955991A1 - Method of cleaning gas from hydrogen sulfide - Google Patents

Description

The invention relates to methods for the purification of gases from hydrogen sulfide and may find application in the petrochemical and petroleum refining industries.

A known method of purification of gas from hydrogen sulfide by contacting the raw material with solid adsorbentlagli 1.

As solid adsorbents, activated carbons, silica gels and others are used.

The closest in technical essence to the invention is a method for purifying gas from hydrogen sulphide by contacting it with a liquid adsorbent 2. Absorption is carried out in packed or dish-shaped columns. The saturated solution of the absorbent is sent for regeneration to a stripping column or a tray type stripper.

However, since the speed of movement in such devices is low, the containers in which the adsorbent reacts with hydrogen sulfide and the separation of the absorbent from the gas takes place are distinguished by large geometrical sizes and metal consumption.

The aim of the invention is to simplify the process.

The goal is achieved by an described method of purifying gas from hydrogen sulphide by contacting it with a liquid adsorbent by spraying the absorbent into the gas stream moving through the pipeline at a rate sufficient to maintain the sprayed absorbent in a suspended state, followed by separation

10 of hydrogen sulfide absorbent from the purified gas stream in the vortex chamber.

The essence of the method is as follows.

15

In the pipeline transporting gas containing hydrogen sulfide, a liquid solution of the absorbent is injected in a spray state. The amount of absorbent introduced is determined by the concentration of hydrogen sulfide in the gas. The absorbent introduced into the pipeline moves BNsecTe with gas in a turbulent flow at a gas transport rate.

Abso mixing efficiency ;;

25 gas bent is provided by flow turbulence.

Claims (2)

The time required for the absorption of P e by the hydrogen sulfide absorbent is ensured by the choice of the pipeline length in which the absorption process takes place. At the end of the pipe, the gas mixture with the absorbent saturated with hydrogen sulfide is sent to the vortex chamber in which l 75% of the gas free from hydrogen sulfide is separated from - 25% gas free from hydrogen sulfide but containing hydrogen sulfide. The gas taken from well 1 (Fig. 1) is passed through tube 2 with a diameter of 12.4 mm. The nozzle 3 is cut on the tube 2., providing a controlled supply of mbnoethanolamine to the Ehaea stream. It ethanolamine is directed to the nozzle from the tank 4 under the pressure of gas from well 1. The gas pressure in tube 2 is measured with a pressure gauge 5, temperature-thermometer 6. At a distance of 4 m from the nozzle at the exit of tube 2 a vortex chamber 7 is mounted, in which the flow Jasa is divided into a cold stream, measured by a diaphragm meter 8, and a hot stream, directed to the separator 9 with a measuring glass. From the separator, the volume of the outgoing gas Zs1 is measured with a diaphragm meter 10. Diaphragm meters 8 and 10 have gauges 11 and 12, thermometers 13 and 14, and nozzles for sampling gas for gas analyzers 15 and 16, respectively. The test is carried out as follows. Raw gas, consisting mainly of methane (97.5 wt.%), Containing hydrogen sulfide in an amount of 0.19 5 vol. % Gas consumption 160 MV. The pressure to the vortex chamber is 5 MPa. the flow velocity in the tube is 2-72 m / s. temperature 10 ° C. After the vortex chamber, the gas is divided into a cold stream with a flow rate of 140 and with a temperature of (-) 16 ° C and a hot stream with a flow rate of 20 MV with a temperature of (+) 17 ° C. Monoethanolamine concentrations of 40 are used. When the solution is fed to monoethanol in an amount of 50 cm by 1 m of gas, complete purification of the gas from hydrogen sulfide is achieved. By reducing the supply of monoethanolamine to zero, an increase in the concentration of hydrogen sulfide from zero to 0.07 was recorded; 0.093; 0.195%. The difference in gas cleaning in hot and cold streams was not observed. The reduction in the consumption of absorbent is achieved by selecting the length of the pipeline and the degree of dispersion of the absorbent. The method makes it possible to carry out a desulfurization process at high gas flow rates, the latter leading to a significant reduction in the metal intensity of the structures. In addition, the introduction of the sprayed absorbent at the beginning of the pipeline allows a drastic decrease in the concentration of active hydrogen sulfide and thereby reduce the intensity of corrosion of the pipeline. Claims A method for purifying gas from hydrogen sulphide by contacting it with liquid a6cop6eHf followed by regeneration of a liquid absorbent, characterized in that, in order to simplify the process, the contacting is carried out by pushing the absorbent into the gas stream moving through the pipeline with a SPEED sufficient to maintain the sprayed absorbent in a pulverized state, followed by the separation of the absorbent saturated with hydrogen sulfide from the purified gas stream in the vortex chamber. Information sources, . taken into account during the examination 1. Thematic reviews. Industrial sanitary cleaning of refined gas from hydrogen sulfide. M., 1970, p. four. 2. Thematic reviews. Industrial sanitary cleaning of refined gas from hydrogen sulfide. M., 1970, p. 4-24 (prototype). fff