SETR tail gas treating process refers to an innovative process consist of the adsorbent and regeneration reactors. The SETR reactor stands for Super Enhanced Tail gas Recovery switching between adsorption and regeneration mode and the STER reactors are located after the tail gas incineration before the stack replacing any type of the caustic scrubber system. The SETR innovative process is not a sub dew point process where the bed become saturated with sulfur, instead, the SETR process are fixed bed reactors that requires heat up and cool down for the SO2 adsorption-based Claus tail gas process. The adsorption mode operates at cold temperature to adsorb the SO2. The regenerator mode operates at hot temperature to regenerate the SO2 by adding a slip stream of the H2S and air from the SRU to the SETR reactor that contains adsorbed SO2 to promote the Claus reaction. In the SETR reactors H2S to react with the adsorbed SO2 in the bed with oxygen the outlet of the hot reactor is recycled to the SRU thermal or catalytic section. The gas stream from the adsorbed cold reactor flows to the stack and it is SO2 free and zero emission is achieved.

An air dryer includes a supporting base, a drying agent container, and an outer cover. The supporting base includes an inlet for receiving compressed air to be subject to a drying process and an outlet for delivering the processed compressed air that has undergone the drying process. The drying agent container is a container supported on the supporting base, contains a drying agent in the interior, and enables the drying process to be performed by passing the compressed air from the inlet through the drying agent. The outer cover surrounds the outer side of the drying agent container on the supporting base and defines a chamber for storing the compressed air between itself and the drying agent container. The supporting base includes first and second mounting surfaces, which are oriented in different directions, and a plurality of inlets, which are oriented in different directions and receive the compressed air.

A CO.sub.2 adsorption and recovery system including an intake unit, a first purification/adsorption/regeneration unit, a second purification/adsorption/regeneration unit, a three-way valve switching unit, a vacuum drawing unit and an exhaust unit is provided. The first and second purification/adsorption/regeneration units have a hollow fiber bundle impurity adsorption column, a hollow fiber bundle CO.sub.2 adsorption column and two heating devices. One set of adsorption columns performs purification and adsorption procedures to the inlet gas in a normal or high pressure condition, and the other set of adsorption columns performs desorption and regeneration procedures in a high temperature condition when the adsorption columns are heated by the heating devices. The three-way valve switching unit exchanges the purification and adsorption procedures with the regeneration procedure to the first and second units. The vacuum drawing unit draws CO.sub.2 desorbed from the CO.sub.2 adsorption columns alternatively. The exhaust unit drains a purified product gas out.

An air dryer having a heater element associated with its valves to prevent freezing at cold temperatures. The air dryer includes a temperature sensor and an electronic controller that reads the temperature sensor during normal operations and selectively opens and closes certain of the valves when the temperature falls below a predetermined threshold to enter a safe mode that avoids freezing of the valves during operation. If an exhaust valve is open when safe mode is entered, the corresponding inlet valve is closed, both of the exhaust valves are closed, and the other inlet valve if opened. If an exhaust valve is not open, both inlet valves are opened and both exhaust valves are closed.

Apparatus for conducting research on adsorption properties of particulate solid adsorption materials for an adsorbate in at least two parallel adsorption beds, and method of using such. The apparatus contains multiple parallel beds of adsorbent, of a comparatively small volume between 0.1 to 10 ml, which are connected to two feeds via a splitter for each feed and capillaries downstream of the splitter and upstream of the adsorption bed. The invention further relates to a method using such apparatus.

Drying device for drying compressed gas which includes at least two vessels with regenerable desiccant and an adjustable valve system which is such that a vessel can dry compressed gas, while the other vessel is being regenerated, whereby by regulating the valve system, the vessels can each in turn dry gas. The drying device includes a regeneration pipe for supplying a regeneration gas which runs from an outlet for dried gas to the valve system, and in which heating means are provided, whereby the drying device is provided with a return pipe for returning the regeneration gas to an inlet, running from the valve system to an inlet pipe which connects to said inlet and in which a venturi ejector is mounted, to which said return pipe is connected, and that regulating means are provided for regulating the flow of gas going through the venturi ejector.

An air dryer having a heater element associated with its valves to prevent freezing at cold temperatures. The air dryer includes a temperature sensor and an electronic controller that reads the temperature sensor and inhibits actuation of the valves whenever the temperature of valves is below freezing or a predetermined temperature that indicates a risk for freezing until the valves have been sufficiently warmed by the heater to avoid freezing during operation.

An air dryer having a heater element associated with its valves to prevent freezing at cold temperatures. The air dryer includes a temperature sensor and an electronic controller that reads the temperature sensor and inhibits actuation of the valves whenever the temperature of valves is below freezing or a predetermined temperature that indicates a risk for freezing until the valves have been sufficiently warmed by the heater to avoid freezing during operation.

A gas laser apparatus may include: a laser chamber connected through a first control valve to a first laser gas supply source that supplies a first laser gas containing a halogen gas and connected through a second control valve to a second laser gas supply source that supplies a second laser gas having a lower halogen gas concentration than the first laser gas; a purification column that removes at least a part of the halogen gas and a halogen compound from at least a part of a gas exhausted from the laser chamber; a booster pump, connected through a third control valve to the laser chamber, which raises a pressure of a gas having passed through the purification column to a gas pressure that is higher than an operating gas pressure of the laser chamber; and a controller that calculates, on a basis of a first amount of a gas supplied from the booster pump through the third control valve to the laser chamber, a second amount of the first laser gas that is to be supplied to the laser chamber and controls the first control valve on a basis of a result of the calculation of the second amount.

An object of the present invention is to provide a pressure swing adsorption gas separation apparatus that can separate strong adsorbate components with high purity without allowing weak adsorbate components to contaminate the strong adsorbate component-storage tank. The present invention provides a pressure swing adsorption gas separation apparatus (100) including a raw material gas-storage tank (1) that stores a mixed gas of a target component and at least one component other than the target component as a raw material gas; a strong adsorbate component-storage tank (2) that stores strong adsorbate components; a weak adsorbate component-storage tank (3) that stores strong adsorbate components; a compressor (4) that compresses a gas of the raw material gas-storage tank (1) or the strong adsorbate component-storage tank (2); a compressor (5) that compresses a gas of the strong adsorbate component-storage tank (3); and four adsorption columns of a lower column (10B), lower column (11B), upper column (10U), and upper column (11U).