RU2532517C2 - Sorbent of hydrogen sulphide - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to sorbents of hydrogen sulphides, which can be used for dry purification of gases. A sorbent of hydrogen sulphide contains urotropine in an amount of 1-10% on a carrier - activated coal.

EFFECT: sorbent possesses an increased activity with respect 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 sulfide sorbent consisting of urotropin in an amount of 1-10% of the total mass of the sorbent on activated carbon as a carrier.

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 h, and then under isothermal conditions at 500-650 ° C for 60-90 minutes. This sorbent due to porosity has an increased activity, however, 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 from 02.27.1995, publ. 10.01.1997 g.) (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 to this problem is achieved by the fact that a layer of urotropin is applied to the surface of activated carbon 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. The 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 urotropin is applied to the surface of the active carbon, for which an impregnating aqueous solution is prepared with which urotropin is applied to the active carbon. Instead of water, you can use other solvents in which urotropine dissolves. The amount of water for the preparation of the impregnating solution is taken depending on the mass of the original activated carbon. Then, urotropin 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 3-5 wt.%. The prepared sorbent coated with urotropin is used to purify gases from hydrogen sulfide.

Example

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

Take 100 g of 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 urotropin in it. The prepared urotropine solution 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 3-5 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 rate of 0.6 cm ³ / 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 Adsorbent 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% urotropin on coal grade AG-3 135

Thus, it can be seen from table 1 that under the same experimental conditions, a sorbent consisting of urotropine on activated carbon is able to sorb hydrogen sulfide from gases longer, which indicates its higher activity and capacity in relation to hydrogen sulfide.

Claims (1)

Hydrogen sulfide sorbent, characterized in that it represents urotropin in an amount of 1-10% of the total mass of the sorbent on activated carbon as a carrier.