288 results about "Co2 removal" patented technology

A process and method for separating CO₂ from a gaseous stream such as natural gas. An ionic liquid comprising an anion having a carboxylate function is used as an adsorbent to selectively complex the CO₂ yielding a gaseous stream with a greatly reduced CO₂ content. The ionic liquid can then be readily be regenerated and recycled.

Ultra cleaning of combustion gas to near zero concentration of residual contaminants followed by the capture of CO₂ is provided. The high removal efficiency of residual contaminants is accomplished by direct contact cooling and scrubbing of the gas with cold water. The temperature of the combustion gas is reduced to 0-20 degrees Celsius to achieve maximum condensation and gas cleaning effect. The CO₂ is captured from the cooled and clean flue gas in a CO₂ absorber (134) utilizing an ammoniated solution or slurry in the NH₃—CO₂H₂O system. The absorber operates at 0-20 degrees Celsius. Regeneration is accomplished by elevating the pressure and temperature of the CO₂-rich solution from the absorber. The CO₂ vapor pressure is high and a pressurized CO₂ stream, with low concentration of NH₃ and water vapor is generated. The high pressure CO₂ stream is cooled and washed to recover the ammonia and moisture from the gas.

A system (10) for removing carbon dioxide from a process gas generated during the combustion of a fuel comprises at least one absorption vessel (12, 14) through which the process gas may be forwarded. The absorption vessel (12, 14) is provided with a sorbent material (50) which is operative for reversibly collecting carbon dioxide from the process gas being forwarded through the sorbent material (50). The sorbent material (50) comprises at least one amine, at least one carbon dioxide activating catalyst, and at least one porous material supporting the at least one catalyst and the at least one amine.

An improved pressure swing adsorption process is provided for removing or separating a gas from a mixture of gases. The PSA process comprises selectively adsorbing a gas from the mixture to form a product gas having a reduced concentration of the selectively adsorbed gas and a low pressure purge stream containing a higher level of the selectively adsorbed gas than contained in the mixture. During regeneration of the adsorbent a co-current recycle stream is provided which has a pressure less than the product stream, but greater than the purge stream for recycle to feed so as to minimize loss of the product gas to purge. The PSA process is particularly useful for removing carbon dioxide from coal bed methane.

A method of processing carbon dioxide adsorbent for use in a CO2 removal system. The method includes combining a polymer, lithium hydroxide (LiOH), and lubricant that dissolves the polymer to form a first LiOH adsorbent. A structure may be formed using the first LiOH adsorbent. The lubricant may be extracted from the structured LiOH adsorbent using a solvent to form a second LiOH adsorbent. The solvent may be removed from the second LiOH adsorbent to form a third LiOH adsorbent. The third LiOH adsorbent may be hydrated to form a fourth LiOH adsorbent having a water content above an anhydrous level.

Described is an apparatus for oxygenation and/or CO2 clearance of a patient, comprising: a flow source or a connection for a flow source for providing a gas flow, a gas flow modulator, a controller to control the gas flow, wherein the controller is operable to: receive input relating to heart activity and/or trachea gas flow of the patient, and control the gas flow modulator to provide a varying gas flow with one or more oscillating components with a frequency or frequencies based on the heart activity and/or trachea flow of the patient.

The invention discloses a method for preparing a vehicle urea solution. The method comprises the following steps: treating industrial desalted water by a reverse osmosis device, a microporous filter and an EDI electric deionizing device and then sterilizing to obtain high purity water, wherein the resistivity of the high purity water is equal to or greater than 16 Momega.cm at 25 DEG C; mixing the high purity water with a high temperature urea solution which is subjected to ammonia and CO2 removal by virtue of flash evaporation during production of urea to prepare a urea aqueous solution with the concentration of 48-55wt% and the temperature of 68-72 DEG C; then cooling to 18-25 DEG C, filtering to obtain crystallized urea, mixing the crystallized urea and the high purity water to prepare another urea aqueous solution with the concentration of 31.8-33.2wt%; finally filtering by a filter film with the aperture of 0.2-0.5 micron to obtain the final vehicle urea solution. According to the method, the vehicle urea solution is directly produced without an external heating source, the contents of biuret, metal ions, insoluble substances and the like are relatively low, the method is especially suitable for directly producing vehicle urea in a urea production factory, and the cost during production is reduced.

The invention relates to a catalytic ozonation treating apparatus and process for refractory organic wastewater. The apparatus comprises a catalytic oxidation tower, an ozone generator connected with the bottom inlet of the catalytic oxidation tower and a tail gas treating and recycling system connected with the top outlet of the catalytic oxidation tower, wherein the outlet of the tail gas treating and recycling system is connected with the inlet of the ozone generator, and the tail gas treating and recycling system comprises a carbon dioxide absorbing tower, a drying unit and an oxygen storage tank which are successively connected. According to the invention, high-concentration ozone is generated from pure oxygen via the ozone generator, macro-molecular refractory organic pollutants in the organic wastewater is subjected to catalytic ozonation in the catalytic oxidation tower, and tail gas is treated by the tail gas treating and recycling system and then cyclically used as a gas source for the ozone generator; carbon dioxide and steam are removed through the tail gas treating and recycling system, so tail gas is purified, secondary pollution is avoided, the utilization rate of oxygen is improved, and treating cost is reduced.

A plant includes a pretreatment unit for H2S removal and air dehydration, and at least two absorbers that receive a feed gas at a pressure of at least 300 psig with variable CO2 content (e.g., between 5 to 60 mol %), wherein the feed gas is scrubbed in the absorbers with an ultralean and a semi-lean physical solvent, respectively, at low temperatures to at least partially remove the CO2 from the feed gas. Such configurations produces a low CO2 dry treated gas and a H2S-free CO2 for sequestration while advantageously providing cooling by expansion of the rich solvent that cools the semi-lean solvent and the feed gas, wherein an ultralean solvent is produced by stripping using dry air.

The invention discloses a purification process for removing sulphur and carbon dioxide in gas by using a two-step method. The purification method comprises six steps as follows: the crude desulphurization of low-pressure high-sulphur gas, desulphurization of high-pressure gas, CO2 removal, the regeneration of decarburization solution, the regeneration of desulfurization solution and H2S concentration, and heat regenerating system. The purification process has the advantages of low energy consumption, low operation strength, simple process and high purification.

A process for removing carbon dioxide from a carbon dioxide containing gas stream is obtained through de-sublimation, vaporization, and liquefaction of various carbon dioxide-containing streams with little or no external refrigeration.