Processes for regenerating adsorbent in a nitrile removal zone. The regenerant comprises a stream of hot liquid that may comprise a portion of the oligomerized effluent or a portion of a hydrotreated effluent. A spent regenerant comprising the desorbed nitriles may be processed along with the oligomerized effluent with existing separation equipment.

A carbon dioxide removal device 100 that include an adsorbent 1 and a reaction vessel 10 that have the adsorbent 1 installed therein, and that brings a gas to be treated containing carbon dioxide into contact with the adsorbent 1 and thereby removes carbon dioxide from the gas, in which the carbon dioxide removal device 100 further includes a water adjustment unit 20 that supplies water to the reaction vessel 10 and discharges water from the reaction vessel 10.

In accordance with exemplary inventive practice, a catalytic system and a temperature swing adsorption system are thermally integrated. The temperature range of the adsorption system is lower than the catalyst operating temperature. Benefits of inventive practice include reduction of total energy consumption and of generated waste-heat. Total energy consumption is reduced by transferring some of the waste-heat generated by the catalytic system into the adsorption system during the sorbent heat-up portion of the sorbent regeneration cycle. The heat is transferred using a thermal reservoir, which accumulates heat from the catalytic apparatus and transfers it to the adsorption apparatus at a later time, and which is repeatedly cycled as the sorbent is cycled. The catalytic system and the adsorption system can be inventively integrated in various ways to reduce the total energy consumed, and/or to modify the sorbent regeneration temperature profile, and/or to obtain an optimum power load profile.

A honeycomb rotor recovering and concentrating apparatus recovers a gas such as carbon dioxide from flue gases and the like and may be capable of utilizing low-temperature waste heat 100 C. or less. The proposed method involves sorbing carbon dioxide while vaporizing and cooling by contacting a water-insoluble carbon dioxide sorbing material (solid amines, etc.) having an acidic gas sorptive capacity with a mixed gas containing carbon dioxide in a wet state. Warm water is brought into contact with the water-insoluble carbon dioxide sorbing material sorbed with carbon dioxide to desorb high concentration of carbon dioxide. The warm water is separated from the water-insoluble carbon dioxide sorbent material desorbed from carbon dioxide. Then the apparatus is returned from the separation step to the sorption step. Thereby, it is possible to drastically increase the recovery rate and recovery concentration of acidic gas (carbon dioxide) continuously.

A filter element (1) for use in a gas purification device (100) is disclosed. It comprises a substrate (10) and a filter layer (20) covering an exterior surface of the substrate (10). The substrate (10) comprises material for containing chemicals (30) effective to remove gas pollutants from a gas. The material of the filter layer (20) is hydrophilic to adsorb liquid solution adsorbents effective in removing gas pollutants from a gas, and the exterior surface of the substrate (10) covered by the filter layer (20) is hydrophobic.

A process is presented for the purification of an olefins feed stream to a benzene alkylation unit. The process removes heavy aromatics in an adsorbent system comprising at least two adsorbent units. The unit passes the olefins feed stream to a first adsorbent unit, while the second adsorbent unit is either in regeneration mode, or standby mode. The process switches the feed stream to the second adsorbent unit and displaces the fluid in the second adsorbent unit, while maintaining the flow of the purified feed stream to the benzene alkylation unit.

A vapor recovery system comprises an inlet located at a first end of a fluid path configured to receive a fluid vapor to the vapor recovery system. The vapor recovery system comprises a condenser located on the fluid path and a scrubber located on the fluid path. The vapor recovery system comprises a composition sensor located on the fluid path between the scrubber and a second end of the fluid path. The composition sensor is configured to measure a composition of the fluid vapor. The vapor recovery system comprises an exhaust located at the second end of the fluid path configured to exhaust at least a portion of the fluid vapor from the fluid path at a composition having an amount of a working fluid below a working fluid threshold.

An integrated adsorption cooling and vacuum dehumidification system (IAdCVD) is provided, including a vacuum section, an evaporator, an adsorption chamber, a condenser, a desorption chamber, and a MCV and an expansion valve. The vacuum section comprises a selective (say hydrophilic) membrane. The evaporator is connected to a low-pressure side to establish a water vapor pressure difference across the selective membrane. The adsorption chamber communicates with the evaporator. The desorption chamber communicates with the condenser. The condenser is configured to convert the water vapor migrated from the desorption chamber into a condensed water. The condensed water in the condenser is directed to the evaporator by passing through the MCV and the expansion valve in sequence, and the condensed water directed to the evaporator enters the evaporator via a first port different from a second port for connecting the evaporator to a chilled water supply.

A process is presented for the purification of an olefins feed stream to a benzene alkylation unit. The process removes heavy aromatics in an adsorbent system comprising at least two adsorbent units. The unit passes the olefins feed stream to a first adsorbent unit, while the second adsorbent unit is either in regeneration mode, or standby mode. The process switches the feed stream to the second adsorbent unit and displaces the fluid in the second adsorbent unit, while maintaining the flow of the purified feed stream to the benzene alkylation unit.

The present disclosure provides a single compression system and a process for capturing carbon dioxide (CO.sub.2) from a flue gas stream containing CO.sub.2. The disclosure also provides a process for regeneration of the carbon dioxide capture media.