Provided is a renewable wet desulfurization process using a suspension bed, comprising mixing the desulfurization slurry with a hydrogen sulfide containing gas to obtain a first mixture, and passing the first mixture into a suspension bed reactor from bottom to top, with controlling the first mixture to have a dwell time of 5-60 minutes in the suspension bed reactor to allow they contact and react sufficiently with each other; and subjecting a second mixture obtained from the reaction to gas liquid separation to produce a rich solution and a purified gas, subjecting the resulting rich solution to flash evaporation and then reacting with an oxygen-containing gas for carrying out regeneration. The process of the present invention may reduce the hydrogen sulfide content in the hydrogen sulfide containing gas from 2.4-140 g/Nm.sup.3 to 50 ppm or less, so that the desulfurization efficiency is 98% or more. The present invention can achieve regeneration of a spent desulfurizer with a regeneration efficiency as high as 65%-83%, and the barren solution obtained by the regeneration may be recycled for being used as the desulfurization slurry, without generating secondary pollution, which is very suitable for industrial promotion.

Disclosed is a CO.sub.2 concentration reducing device for separating and removing CO.sub.2 from a gas containing CO.sub.2 with a CO.sub.2 adsorbent, the CO.sub.2 concentration reducing device including: an adsorbent container which contains the CO.sub.2 adsorbent; and a heating unit which heats the CO.sub.2 adsorbent by an induction heating or a dielectric heating. Thus, a ventilation quantity can be reduced when CO.sub.2 accumulated in a room is removed, and an electric power required for the ventilation and the electric power required for air conditioning can be reduced.

Disclosed is a CO.sub.2 concentration reducing device for separating and removing CO.sub.2 from a gas containing CO.sub.2 with a CO.sub.2 adsorbent, the CO.sub.2 concentration reducing device including: an adsorbent container which contains the CO.sub.2 adsorbent; and a heating unit which heats the CO.sub.2 adsorbent by an induction heating or a dielectric heating. Thus, a ventilation quantity can be reduced when CO.sub.2 accumulated in a room is removed, and an electric power required for the ventilation and the electric power required for air conditioning can be reduced.

A method for producing an aroma composition from roasted coffee beans, including grinding roasted coffee beans to give a crude ground powder of roasted coffee beans that contains a fine powder and thin flakes, removing the fine powder and thin flakes from a gas that contains aroma compounds emitted from the roasted coffee beans in grinding the roasted coffee beans and the fine powder and thin flakes, introducing the gas from which the fine powder and thin flakes have been removed into an adsorbent to thereby make the aroma compounds adsorbed by the adsorbent, and collecting the aroma compounds from the adsorbent to prepare an aroma composition containing the aroma compounds. The adsorbent is held in an adsorbent holder in an aroma compound adsorbing device, and the adsorbent holder has a mesh lid at both ends thereof in the gas flowing direction therethrough.

A method for producing an aroma composition from roasted coffee beans, including grinding roasted coffee beans to give a crude ground powder of roasted coffee beans that contains a fine powder and thin flakes, removing the fine powder and thin flakes from a gas that contains aroma compounds emitted from the roasted coffee beans in grinding the roasted coffee beans and the fine powder and thin flakes, introducing the gas from which the fine powder and thin flakes have been removed into an adsorbent to thereby make the aroma compounds adsorbed by the adsorbent, and collecting the aroma compounds from the adsorbent to prepare an aroma composition containing the aroma compounds. The adsorbent is held in an adsorbent holder in an aroma compound adsorbing device, and the adsorbent holder has a mesh lid at both ends thereof in the gas flowing direction therethrough.

A process for removing hydrogen sulfide (H.sub.2S) from a H.sub.2S-containing gas composition includes charging a liquid to a reactor under continuous agitation and dispersing particles of a zinc-based zeolitic imidazolate framework-8 (ZIF-8) in the liquid to form a ZIF-8 mixture. The method further includes introducing the H.sub.2S-containing gas composition to the reactor containing the ZIF-8 mixture under continuous agitation and passing the H.sub.2S-containing gas composition through the ZIF-8 mixture. In addition, the method includes adsorbing the H.sub.2S from the H.sub.2S-containing gas composition onto the ZIF-8 to remove the H.sub.2S from the H.sub.2S-containing gas composition and form a purified gas composition.

A process for removing hydrogen sulfide (H.sub.2S) from a H.sub.2S-containing gas composition includes charging a liquid to a reactor under continuous agitation and dispersing particles of a zinc-based zeolitic imidazolate framework-8 (ZIF-8) in the liquid to form a ZIF-8 mixture. The method further includes introducing the H.sub.2S-containing gas composition to the reactor containing the ZIF-8 mixture under continuous agitation and passing the H.sub.2S-containing gas composition through the ZIF-8 mixture. In addition, the method includes adsorbing the H.sub.2S from the H.sub.2S-containing gas composition onto the ZIF-8 to remove the H.sub.2S from the H.sub.2S-containing gas composition and form a purified gas composition.

An air treatment article is provided, comprising: a semipermeable barrier and a plurality of multi-staged non-film forming polymer abatement particles having a core polymer and at least one shell polymer; wherein the core polymer accounts for 1 to 25 wt % of the weight of the non-film forming polymer abatement particles; wherein the semipermeable barrier is disposed between an air atmosphere and the non-film forming polymer abatement particles; wherein the semipermeable barrier impedes passage therethrough by the non-film forming polymer abatement particles; wherein the semipermeable barrier permits passage therethrough by a for-treatment air containing a contaminant such that the for-treatment air can make contact with the non-film forming polymer abatement particles; wherein the non-film forming polymer abatement particles have an affinity for the contaminant.

An air treatment article is provided, comprising: a semipermeable barrier and a plurality of multi-staged non-film forming polymer abatement particles having a core polymer and at least one shell polymer; wherein the core polymer accounts for 1 to 25 wt % of the weight of the non-film forming polymer abatement particles; wherein the semipermeable barrier is disposed between an air atmosphere and the non-film forming polymer abatement particles; wherein the semipermeable barrier impedes passage therethrough by the non-film forming polymer abatement particles; wherein the semipermeable barrier permits passage therethrough by a for-treatment air containing a contaminant such that the for-treatment air can make contact with the non-film forming polymer abatement particles; wherein the non-film forming polymer abatement particles have an affinity for the contaminant.

The present disclosure relates to a process for capturing carbon-dioxide from a gas stream. In order to capture the carbon-dioxide, a support is provided and potassium carbonate (K.sub.2CO.sub.3) is impregnated thereon to form an adsorbent comprising potassium carbonate (K.sub.2CO.sub.3) impregnated support. The adsorbent is activated to form an activated adsorbent. The gas stream is passed through the adsorber to enable adsorption of the carbon-dioxide on the activated adsorbent to form a carbon-dioxide laden adsorbent. The carbon-dioxide laden adsorbent is transferred to a desorber for at least partially desorbing the carbon-dioxide from the carbon-dioxide laden adsorbent by passing a carbon-dioxide deficient stream through the desorber. The partially regenerated adsorbent is returned to the adsorber for adsorbing the carbon-dioxide from the carbon-dioxide. The process of the present disclosure reduces the overall energy demand by partially regenerating the adsorbent.