The present disclosure relates to a method of separating a compound of interest, particularly unsaturated compound(s) of interest, from a mixture. The compound is separated using a column having a chromatographic stationary phase material for various different modes of chromatography containing a first substituent and a second substituent. The first substituent minimizes compound retention variation over time under chromatographic conditions. The second substituent chromatographically and selectively retains the compound by incorporating one or more aromatic, polyaromatic, heterocyclic aromatic, or polyheterocyclic aromatic hydrocarbon groups, each group being optionally substituted with an aliphatic group. In some examples, the present disclosure can include a chromatographic system having a chromatographic column having a stationary phase with a chromatographic substrate containing silica, metal oxide, an inorganic-organic hybrid material, a group of block copolymers, or a combination thereof.

An object of the present invention is to provide a separation medium and a separation method, ensuring high selectivity and good separation efficiency for specific steviol glycosides. The present invention is related to a separation medium in which polyethyleneimine is immobilized to porous particles of a (meth)acrylic polymer having a crosslinked structure and a hydroxyl group.

A method for removing a fluorine-containing compound from discharge water, which includes bringing discharge water containing two or more fluorine-containing compounds represented by the following general formula (1) or (2) into contact with an adsorbent so as to adsorb the two or more fluorine-containing compounds:

(H(CF.sub.2).sub.mCOO).sub.pM.sup.1General Formula (1):

wherein m is 3 to 19, M.sup.1 is H, a metal atom, NR.sup.b.sub.4, where R.sup.b is the same or different and is H or an organic group having 1 to 10 carbon atoms, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and p is 1 or 2;

(H(CF.sub.2).sub.nSO.sub.3).sub.qM.sup.2General Formula (2):

wherein n is 4 to 20; M.sup.2 is H, a metal atom, NR.sup.b.sub.4, where R.sup.b is the same as above, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and q is 1 or 2.

In one aspect, the present invention provides a chromatographic stationary phase material for various different modes of chromatography represented by Formula 1: [X](W).sub.a(Q).sub.b(T).sub.c (Formula 1). X can be a high purity chromatographic core composition having a surface comprising a silica core material, metal oxide core material, an inorganic-organic hybrid material or a group of block copolymers thereof. W can be absent and/or can include hydrogen and/or can include a hydroxyl on the surface of X. Q can be a functional group that minimizes retention variation over time (drift) under chromatographic conditions utilizing low water concentrations. T can include one or more hydrophilic, polar, ionizable, and/or charged functional groups that chromatographically interact with the analyte. Additionally, b and c can be positive numbers, with the ratio 0.05?(b/c)?100, and a?0.

A filter aid composition may include an acid-treated composite silicate. The composite silicate comprises a silicate substrate and a precipitated silica. A method for making a filter aid composition may include providing a silicate substrate, precipitating a silica onto the silicate substrate to form a composite silicate, and treating the composite silicate with an acid to form an acid-treated composite silicate. A method for filtering a non-aqueous liquid may include providing a non-aqueous liquid for filtering and filtering the non-aqueous liquid through an acid-treated composite silicate. The composite silicate may include a silicate substrate and a precipitated silica. A filter aid may include an acid-treated composite diatomite. The acid-treated composite diatomite may include a diatomite substrate and a precipitated silica gel coating. The precipitated silica may be a precipitated ilica gel.

Disclosed in certain embodiments are sorbents for capturing heavy hydrocarbons via thermal swing adsorption processes.

The present disclosure describes a particulate adsorbent material that includes: an adsorbent having microscopic pores with a diameter of <100 nm, macroscopic pores having a diameter of ?100 nm, and a ratio of a volume of the macroscopic pores to a volume of the microscopic pores greater than about 150%, wherein the particulate adsorbent material has a retentivity of about ?1.0 g/dL. A method of making the same includes: admixing an adsorbent with microscopic pores having a diameter <100 nm and a processing-aid that sublimates, vaporizes, chemically decomposes, solubilizes, or melts when heated to a temperature of ?100? C.; and heating the mixture to about 100-1200? C. for about 0.25-24 hours forming macroscopic pores having a diameter of ?100 nm when the processing-aid is sublimated, vaporized, chemically decomposed, solubilized, or melted, wherein a ratio of a volume of the macroscopic pores to a volume of the microscopic pores is >150%.

Highly spherical sorbents of porous hydroxyapatite materials and methods of producing these sorbents are disclosed. The sorbents of the present invention have good mechanical stability and are useful as chromatography media for the separation of biomolecules, such as proteins and nucleic acids.

A porous material including alumina, the alumina including alpha-alumina, the porous material including one or more metals selected from Co, Mo, Ni, W and combinations thereof, and the porous material having a BET-surface area of 1-110 m.sup.2/g, a total pore volume of 0.50-0.80 ml/g, as measured by mercury intrusion porosimetry, and a pore size distribution (PSD) with at least 30 vol % of the total pore volume being in pores with a radius 400 , suitably pores with a radius 500 . A process for removing impurities such as phosphorous (P) from a feedstock, by contacting the feedstock with a guard bed including the above porous material. A guard bed for a hydrotreatment system including the porous material, a hydrotreatment system including a guard bed which includes the porous material and a downstream hydrotreatment section including at least one hydrotreatment catalyst.

The present invention relates to a porous nano structure and a method of manufacturing same. The porous nano structure exhibits excellent mechanical strength and has a wide specific surface area and is therefore useful as an absorbent, a vibration absorber, a sound absorber, a shock absorber, a catalyst support, a membrane for separation, etc., and can be applied to various technical fields such as electronics, composite materials, sensors, catalysts, energy storage materials, and ultra-high capacity storage batteries. In particular, the porous nano structure exhibits excellent hydrogen storage capability and is thus very useful as a hydrogen storage material.