RU2533144C1 - Hydrogen sulphide sorbent - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: sorbent of hydrogen sulphide contains paraphenylenediamine in a quantity of 1-10% from the general weight of the sorbent and a solid porous carrier.

EFFECT: sorbent possesses an increased activity relative to hydrogen sulphide.

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Description

The invention relates to the production of a sorbent for the absorption of hydrogen sulfide during dry gas cleaning, in particular a hydrogen sulphide sorbent consisting of paraphenylenediamine in an amount of 1-10% of the total mass of the sorbent on any solid porous carrier (substrate).

Known porous sorbent of hydrogen sulfide obtained by co-grinding solid iron oxides with an activator-pore former, for example ammonium chloride, in the amount of 5-15% by weight of the main component and a binder - sodium lingosulfate in the amount of 15-30% by weight of the main component. Tablets or granules are made from the mixture, which are subjected to heat treatment in a hydrogen atmosphere, first under polythermal conditions up to 500-650 ° C for 1 hour, and then under isothermal conditions at 500-650 ° C for 60-90 minutes. Due to porosity, this sorbent has an increased activity, but insufficient for the manufacture of compact filters for the purification of gases from hydrogen sulfide. (Bosnyatsky G.P. and others. A method of producing a sorbent for hydrogen sulfide. Application No. 95102800 of 02.27.1995, publ. 10.01.1997) (analog).

Closest to the proposed invention is a sorbent for the absorption of ammonia and hydrogen sulfide obtained by impregnation of activated carbon with copper sulfate and heat treatment of granules. Heat treatment of the sorbent is carried out at 100-170 ° C in a fluidized bed furnace after impregnation, and the coal is impregnated with a solution of concentration of 15-25 wt.% At a temperature of 80-95 ° C and a volume ratio of sorbent and solution of 1: 0.25 ÷ 0, 45. Due to the high porosity of activated carbon, the sorbent has an increased activity, however, the activity and sulfur intensity of the sorbent are not enough to produce compact filters for cleaning gases from hydrogen sulfide (Vnuchkova V.A. et al. Method for producing sorbent. Application No. 96118528/25 of 09.17.1996, ) (prototype).

The task of the invention is to obtain a sorbent for the absorption of hydrogen sulfide. The solution of this problem is achieved by the fact that on the surface of solid carriers (for example, silica gel, activated carbon, zeolites, etc.) a layer of paraphenylenediamine is applied in an amount of 1-10% of the total mass of the sorbent. The process is conducted as follows. In a typical experiment, a batch of initial activated carbon is taken from a batch. Pre-activated carbon is dried in convection dryers at a temperature of 105-150 ° C to remove moisture from its pores and left to cool to room temperature. Then, a layer of paraphenylenediamine is applied to the surface of the active carbon, for which purpose an impregnating aqueous solution is prepared with which paraphenylenediamine is applied to the activated carbon. Instead of water, you can use other solvents in which paraphenylenediamine is dissolved. The amount of water for the preparation of the impregnating solution is taken depending on the mass of the original activated carbon. Then, paraphenylenediamine is dissolved in water in an amount of 1-10 wt.% By weight of the initial active carbon. Activated charcoal is wetted with the prepared solution while stirring until the entire solution is absorbed in charcoal, this takes no more than 30 minutes. After that, activated carbon is dried in convection dryers to a residual moisture content of 0-5 wt.%. The prepared sorbent coated with paraphenylenediamine is used to purify gases from hydrogen sulfide.

Example.

Sorbent is prepared on the basis of activated carbon of the industrial grade AG-3 (manufacturer of OJSC "Sorbent", Perm).

Take 100 g of the source of active carbon, dried at 110 ° C to constant weight. After this, an impregnating aqueous solution is prepared. To do this, take 75 g of water and dissolve 3 g of paraphenylenediamine in it. The prepared solution of paraphenylenediamine is wetted with a sample of AG-3 coal weighing 97 g for 30 minutes with stirring. Then the activated carbon is dried at a temperature of 75 ° C in an oven to a residual moisture content of 0-5 wt.%.

The sorbent obtained in this way is subjected to a hydrogen sulfide capacity test before breakthrough. The hydrogen sulfide capacity was studied before breakthrough in a glass tube with a diameter of 7.5 mm and a length of 14 cm. Various samples of sorbents were placed in a glass tube. A gas mixture consisting of 5% hydrogen sulfide and 95% nitrogen at atmospheric pressure at a speed of 0.6 cm / s was passed through a glass tube. At the outlet, a gas sample was taken to analyze the concentration of hydrogen sulfide according to GOST 11382-76. A breakdown of hydrogen sulfide was considered to be the concentration of hydrogen sulfide at the output above 0.01% by volume.

Table 1 shows the data on the study of various sorbents

Table 1 Reagent Samples Operating time before a breakthrough, min one 2 DIAS-25 (fraction 1.0-1.6 mm) 53 Absorbent AGS-60 (fraction 1.0-1.6 mm) 31 CATALYST - APS-T (fraction 1.0-1.6 mm) 19 Adsorbent KAS-50 (fraction 1.0-1.6 mm) 17 Sorbent, consisting of 3% paraphenylenediamine on coal grade AG-3 140

Thus, it can be seen from Table 1 that, under the same experimental conditions, a sorbent consisting of paraphenylenediamine on a solid support is capable of longer adsorbing hydrogen sulfide from gases, which indicates its higher activity and capacity with respect to hydrogen sulfide.

Claims (1)

Hydrogen sulfide sorbent, characterized in that it is paraphenylenediamine in an amount of 1-10% of the total mass of the sorbent on a solid porous carrier.