Systems and methods used to control tangential flow filtration are provided, including control systems and methods for use with connected systems with upstream processing units, such as chromatography processing units, in fluid communication with a tangential flow filtration processing unit. Also included are control systems and methods for performing continuous concentration using single-pass tangential flow filtration with permeate flow control.

Systems and methods used to control tangential flow filtration are provided, including control systems and methods for use with connected systems with upstream processing units, such as chromatography processing units, in fluid communication with a tangential flow filtration processing unit. Also included are control systems and methods for performing continuous concentration using single-pass tangential flow filtration with permeate flow control.

The present invention refers to a filtering device for filtering a fluid containing dissolved solutions and optionally colloidal substances, including solvents and solutes, comprising a first filter unit (12) serving to remove substances in a first filtering step by way of a membrane filtration, said removed substances having a molecular weight above a defined limit value, a second filter unit (19), disposed downstream of the first filter unit (12), for the treatment of the permeate of the first filter unit (12), wherein the second filter unit (19) comprises a filter bed comprising at least one filter material of the group comprising graphene, modified graphene, graphite, activated carbon and a zeolite compound, and a third filter unit (20), disposed downstream of the second filter unit (19), for the treatment of the permeate of the second filter unit (19), wherein the third filter unit (20) comprises a porous membrane, through which the liquid to be filtered flows in a cross-flow. The present invention provides a device with the possibility of filtration with high working pressure, avoiding possible clogging inside the adsorbing material and easy regeneration and reactivation of the adsorbing material.

The present invention refers to a filtering device for filtering a fluid containing dissolved solutions and optionally colloidal substances, including solvents and solutes, comprising a first filter unit (12) serving to remove substances in a first filtering step by way of a membrane filtration, said removed substances having a molecular weight above a defined limit value, a second filter unit (19), disposed downstream of the first filter unit (12), for the treatment of the permeate of the first filter unit (12), wherein the second filter unit (19) comprises a filter bed comprising at least one filter material of the group comprising graphene, modified graphene, graphite, activated carbon and a zeolite compound, and a third filter unit (20), disposed downstream of the second filter unit (19), for the treatment of the permeate of the second filter unit (19), wherein the third filter unit (20) comprises a porous membrane, through which the liquid to be filtered flows in a cross-flow. The present invention provides a device with the possibility of filtration with high working pressure, avoiding possible clogging inside the adsorbing material and easy regeneration and reactivation of the adsorbing material.

A method for separating and recovering carbon dioxide from ambient air includes continuously bringing ambient air into contact with a basic aqueous solution; electrodialysis of the solution using bipolar and anion-selective ion exchange membranes as well as recycling the depleted solution; separating CO.sub.2 from the enriched solution and recycling the solution depleted of CO.sub.2. The absorption is performed in an absorber, open basin, or a combination thereof. Separation is achieved by thermal desorption of CO.sub.2 by steam stripping to obtain a carbon dioxide/steam mixture; and/or by chemical reaction of the (hydrogen-) carbonate ions, in which the CO.sub.2 contained is converted into a water-insoluble salt or a gas and simultaneously removed from the solution. The pH of either obtained solution is measured before the recycling or before the separation, and is adjusted to a predetermined value. pH is measured and adjusted based on how absorption and separation are performed.

A filtering device is for obtaining a chemical liquid by purifying a liquid to be purified and has an inlet portion, an outlet portion, a filter A, a filter B different from the filter A, and a flow path extending from the inlet portion to the outlet portion, in which the filter A and the filter B are arranged in series between the inlet portion and the outlet portion and have, and the filter A is selected from the group consisting of predetermined filters A1, A2, and A3.

An integrated, membrane-based process to produce purified water and conversion of salt to high value chemicals from oil and gas well produced water is described. A liquid stream including water and dissolved salt is flowed through pretreatment units and one or more desalination and concentration units which remove at least a portion of the water to form a brine enriched in dissolved salt. The purified high-density brine may be subjected to electrically-enforced salt dissociation techniques to produce chemicals from oil and gas produced water.

The present disclosure relates to a water purification apparatus that comprises a reverse osmosis device, RO-device, producing a purified water flow and to a corresponding method. The proposed method comprises detecting at least one fluid property of purified water in the purified water path and regulating a flow rate of water in the recirculation path to fulfil one or more predetermined criteria of the purified water in the purified water path, based on the at least one detected fluid property. The present disclosure also relates to a computer program and a computer program product implementing the method.

A filtering device is for obtaining a chemical liquid by purifying a liquid to be purified and has an inlet portion, an outlet portion, a filter A, a filter B different from the filter A, and a flow path extending from the inlet portion to the outlet portion, in which the filter A and the filter B are arranged in series between the inlet portion and the outlet portion and have, and the filter A is selected from the group consisting of predetermined filters A1, A2, and A3.

Disclosed is a continuous process for the purification of steviol glycosides such as Rebaudioside D and/or Rebaudioside M extracted from the dried stevia leaves or extracted from a fermentation broth using continuous simulated moving bed processes and nanofiltration without the addition of organic solvents to obtain a purified steviol product comprising sweet steviol glycosides. The sweet steviol glycosides can be used as substitutes for caloric sweeteners in beverages and in other food items.