Most micro–mesoporous adsorbents used in practical adsorptive fluid (gas and liquid) separation p... more Most micro–mesoporous adsorbents used in practical adsorptive fluid (gas and liquid) separation processes are energetically heterogeneous. The adsorbent heterogeneity plays a significant role in establishing the shapes of the equilibrium adsorption isotherms (pure component or mixture), the corresponding heats of adsorption, and the adsorbate mass-transfer rates, which in turn determine the overall separation performance by a process. The sources of the adsorbent heterogeneity are discussed, and the pros and cons of several analytical heterogeneous models describing pure and multicomponent adsorption isotherms, heats, and adsorbate mass-transfer coefficients are analyzed. Several critical effects of the adsorbent heterogeneity on the equilibrium isotherms are presented with examples to describe the complexity of the subject. The overall effect of adsorbent heterogeneity on an adsorptive process performance will, of course, depend on the specific adsorbate–adsorbent–process design combination. The results ...
Abstract Several thermal swing adsorption process configurations for removing trace impurities fr... more Abstract Several thermal swing adsorption process configurations for removing trace impurities from landfill gas are compared. It is shown that significant improvements in process performance can be realized by properly integrating the bulk fractionation and trace removal adsorption systems. Rules of thumb are outlined for designing efficient thermal swing adsorption processes to remove trace impurities from a multicomponent gas mixture.
As an integral part of the liquid-phase methanol (LPMEOH) process development program, the presen... more As an integral part of the liquid-phase methanol (LPMEOH) process development program, the present study evaluated adsorptive schemes to remove traces of catalyst poisons such as iron carbonyl, carbonyl sulfide, and hydrogen sulfide from coal gas on a pilot scale. Tests were conducted with coal gas from the Cool Water gasification plant at Daggett, California. Iron carbonyl, carbonyl sulfide, and hydrogen sulfide were effectively removed from the coal gas. The adsorption capacities of Linde H-Y zeolite and Calgon BPL carbon for Fe(CO)5 compared well with previous bench-scale results at similar CO2 partial pressure. Adsorption of COS by Calgon FCA carbon appeared to be chemical and nonregenerable by thermal treatment in nitrogen. A Cu/Zn catalyst removed H2S very effectively. With the adsorption system on-line, a methanol catalyst showed stable activity during 120 h of operation, demonstrating the feasibility of adsorptive removal of trace catalyst poisons from the synthesis gas. Mass transfer coefficients were estimated for Fe(CO)5 and COS removal which can be directly used for design and scale up.
... blower. This feed gas stream then enters an ad-sorptive pretreatment system where undesired i... more ... blower. This feed gas stream then enters an ad-sorptive pretreatment system where undesired impurities such as heavy hydrocarbons and acetylene are removed by a standard thermal swing adsorption (TSA) process. These ...
The invention provides vacuum swing adsorption processes that produce an essentially carbon monox... more The invention provides vacuum swing adsorption processes that produce an essentially carbon monoxide-free hydrogen or helium gas stream from, respectively, a high-purity (e.g., pipeline grade) hydrogen or helium gas stream using one or two adsorber beds. By using physical adsorbents with high heats of nitrogen adsorption, intermediate heats of carbon monoxide adsorption, and low heats of hydrogen and helium adsorption,
Most micro–mesoporous adsorbents used in practical adsorptive fluid (gas and liquid) separation p... more Most micro–mesoporous adsorbents used in practical adsorptive fluid (gas and liquid) separation processes are energetically heterogeneous. The adsorbent heterogeneity plays a significant role in establishing the shapes of the equilibrium adsorption isotherms (pure component or mixture), the corresponding heats of adsorption, and the adsorbate mass-transfer rates, which in turn determine the overall separation performance by a process. The sources of the adsorbent heterogeneity are discussed, and the pros and cons of several analytical heterogeneous models describing pure and multicomponent adsorption isotherms, heats, and adsorbate mass-transfer coefficients are analyzed. Several critical effects of the adsorbent heterogeneity on the equilibrium isotherms are presented with examples to describe the complexity of the subject. The overall effect of adsorbent heterogeneity on an adsorptive process performance will, of course, depend on the specific adsorbate–adsorbent–process design combination. The results ...
Abstract Several thermal swing adsorption process configurations for removing trace impurities fr... more Abstract Several thermal swing adsorption process configurations for removing trace impurities from landfill gas are compared. It is shown that significant improvements in process performance can be realized by properly integrating the bulk fractionation and trace removal adsorption systems. Rules of thumb are outlined for designing efficient thermal swing adsorption processes to remove trace impurities from a multicomponent gas mixture.
As an integral part of the liquid-phase methanol (LPMEOH) process development program, the presen... more As an integral part of the liquid-phase methanol (LPMEOH) process development program, the present study evaluated adsorptive schemes to remove traces of catalyst poisons such as iron carbonyl, carbonyl sulfide, and hydrogen sulfide from coal gas on a pilot scale. Tests were conducted with coal gas from the Cool Water gasification plant at Daggett, California. Iron carbonyl, carbonyl sulfide, and hydrogen sulfide were effectively removed from the coal gas. The adsorption capacities of Linde H-Y zeolite and Calgon BPL carbon for Fe(CO)5 compared well with previous bench-scale results at similar CO2 partial pressure. Adsorption of COS by Calgon FCA carbon appeared to be chemical and nonregenerable by thermal treatment in nitrogen. A Cu/Zn catalyst removed H2S very effectively. With the adsorption system on-line, a methanol catalyst showed stable activity during 120 h of operation, demonstrating the feasibility of adsorptive removal of trace catalyst poisons from the synthesis gas. Mass transfer coefficients were estimated for Fe(CO)5 and COS removal which can be directly used for design and scale up.
... blower. This feed gas stream then enters an ad-sorptive pretreatment system where undesired i... more ... blower. This feed gas stream then enters an ad-sorptive pretreatment system where undesired impurities such as heavy hydrocarbons and acetylene are removed by a standard thermal swing adsorption (TSA) process. These ...
The invention provides vacuum swing adsorption processes that produce an essentially carbon monox... more The invention provides vacuum swing adsorption processes that produce an essentially carbon monoxide-free hydrogen or helium gas stream from, respectively, a high-purity (e.g., pipeline grade) hydrogen or helium gas stream using one or two adsorber beds. By using physical adsorbents with high heats of nitrogen adsorption, intermediate heats of carbon monoxide adsorption, and low heats of hydrogen and helium adsorption,
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