DE724911C - Process for removing sulfur compounds, especially organic ones, from gases and / or vapors - Google Patents

Description

Process for removing sulfur compounds, especially organic ones; from gases and / or vapors It is well known that many reactions such as B. the catalytic hydrogenation of carbon dioxide, required in the Sulfur compounds contained in the starting gases, especially the organic ones, to be completely eliminated. Just the removal of the organic sulfur compounds (Carbon disulfide, 1Vccaptans, carbon oxysulfide, thiopnene, thiotols, etc.) runs into great difficulties.

It has already been proposed that these substances be catalytically decomposed o. The like. To be destroyed at a relatively high temperature (25o to 300 °) .. Apart of the fact that this experience does not necessarily work reliably, gives dag @ work at such high temperatures, especially in the presence of CO-containing gases, easy to undesirable side reactions cause and is also because of the necessary gas heating relatively expensive.

It has now been found that oxidizable sulfur compounds especially the organic, by treatment with salts, which are easily oxygen release and are applied to large-surface carrier bodies, even when relatively Can be removed easily and completely at only slightly elevated temperature. As oxidizing Salts are especially suitable nitrates, then chlorates, permanganates, chromates, bichromates etc. As carriers, those with a large internal surface are particularly effective. For example, active charcoal, silica gel and the like are more effective than lawn iron ore, Coke and the like, 1, which, however, can also be used.

When using sodium nitrite as an oxidizing salt on activated carbon Temperatures in the vicinity of 80 ° have proven to be advantageous as a carrier. It is useful, in addition to the oxidizing salt, alkaline reactants such as Soda and the like to be used. If the gas to be cleaned is significant Contains quantities of hydrogen sulphide, it is expedient before the oxidative treatment freed from this in the usual way.

The. used masses can be easily removed by leaching with water, Soaking with a solution of the oxidizing salt and, if necessary, the alkaline one reacting) and subsequent drying prepare for reuse; these Process steps can be carried out in the reaction vessel itself without difficulty «Earth, leaving the drying of the mass to the gas stream to be cleaned can.

Example 1.61: g of activated charcoal were soaked with a solution of 16 g sodium nitrite and soda ash in 2 l of water and dried by the gas stream to be cleaned. 2.5 to 31 synthesis gas per minute (H.: CO = z -1; with 5 to 6 g of organically bound sulfur per ioom- were passed over this mass at So. Sulfur / ioom2 # found. The effectiveness of the mass remains unchanged until 50 and more percent of the nitrite has been consumed If lawn iron ore is used as the carrier for the sodium nitrite, the sulfur content of the same starting gas is removed at So 'and the flow velocity mentioned up to oz to 0.3 g sulfur / 100.

It has already been suggested to contain malodorous sheep Stolte to remove it from exhaust gases by bringing it into contact with small wood treated with solutions of oxidizing substances. from this information it was not possible to infer that there were also solid, undissolved substances, call them finely divided Form can be applied to large-surface carrier materials, in the case of relatively low temperature has an oxidizing effect on organic sulfur compounds would exercise as it is known that the reactivity of most substances in the solid state aul:) is considerably less than in the dissolved state. Also from Literature information, according to which in some cases individual substances, both in solid and catalytic effectiveness even in the dissolved state, albeit on a completely different basis Ways to unfold. could not be foreseen that non-catalytic Oxidations with solid salts would succeed, if and only if they are applied in finely divided form on large, upper-level bodies. That The present process has nothing to do with the known removal of hydrogen sulfide either to do by atmospheric oxygen using activated carbon as a catalyst, because in this case the organic sulfur compounds remain essentially unaffected. From the fact that gaseous oxygen is activated so far by activated carbon «Can ground that it can easily attack the otydai) leii hydrogen sulfide, one cannot deduce that by applying solid salts to large surfaces Carriers activate the chemically bound oxygen of these salts would, and to a certain extent, then also oxidation of the organic ones, which are very difficult to attack Sulfur compounds takes place because one is probably the activation of a gas through an adsorbent can be imagined, but not that of a chemical one bound constituent of a substance with a large surface area, also of another Kind of test substance located as activated carbon.

It has also already been proposed to purify fuel gases by dab it via a mixture of chlorides and hydrochloric acid applied to small pieces of wood be directed. As an antiseptic, the small wood is a very small amount of - Potassium permanganate added, but this has no cleaning effect on the gas exercise kaim. Likewise, the well-known suggestions. organic sulfur compounds to adsorb on active charcoal without oxidation or to adsorb carbon dioxide on alkalized charcoal To osvdate active coal with gaseous oxygen, nothing to do with the process to do according to the invention.

The elder's procedure. However, patent 701 7 55 which was not previously published, which protects the removal of organically bound sulfur from water gas by allowing activated carbon soaked with oxidizing agents produced according to patent .163 772 to act, is not claimed here.

Claims (2)

PATENT CLAIMS: i. Process for removing otdable sulfur compounds, in particular organic ones, such as carbon disulfide. Mercaptans etc., from gases, gas mixtures and / or vapors. like synthesis gas. for the catalytic hydrogenation of carbon monoxide, characterized in that the gases and / or diimetics to be purified, optionally after removal of hydrogen sulfide, in a manner known to me with solid, finely divided salts. which easily give off oxygen and are applied to large-surface carrier bodies such as active hollow, silica gels, lawn iron ore, coal or lignite coke or the like, are treated at only slightly elevated temperature, preferably at about 80 ', with the exception of the method of patent 701 758 is. 2. The method according to claim i, characterized in that the treatment of the Gases with oxygen-releasing salts in the presence of an alkaline reacting salt, such as soda or the like, the amount of which is about 1 /; to 11, that of the oxidizing, takes place.