Disclosed are methods and compositions for coagulating and clarifying produced waters for use as boiler feed waters, for example for the generation of steam. The methods and compositions are especially useful for treatment of produced waters from steam-injection methods of tertiary oil recovery such as steam-assisted gravitational drainage. Disclosed are compositions comprising a first copolymer having a high molecular weight and bearing a low molar cationic charge and a second copolymer having a lower molecular weight and bearing a high molar cationic charge. The compositions are suitable for addition as coagulants to produced waters that have been treated by warm lime softening. Also disclosed are methods of treating produced waters from steam-injection oil recovery for use as boiler feed waters to generate steam in such steam injection methods.

Provided herein are polymers obtainable by a process including the steps a) and b) described below. In Step a) at least one component a1) is condensed to obtain a polyether having remaining hydroxyl groups. Component a1) is at least one component selected from N-(hydroxyalkyl) amins according to formula (Ia) and/or (Ib) as defined below. Besides component a1), further components can be present in the condensation step a). In step b) a part of the remaining hydroxyl groups are reacted with at least one alkylene oxide. The alkoxylation according to step b) is carried out in a substoichiometric way. The ratio of i) the alkylene oxide versus ii) the sum of the amount of the remaining hydroxyl groups is >0:1 to <1:1 [mol/mol]. Further provided herein is a process for preparing such polymers and derivatives of the polymers by quaternization, protonation, sulphation and/or phosphation.

The invention concerns novel polyamines with formula (I), obtained by the reaction between piperazine and an epihalohydrin or a 1,3-dihalo-2-propanol,

##STR00001##

n being in the range 2 to 100, R.sub.1 being equally either an H or an alkyl radical containing between 1 and 8 carbon atoms or a hydroxyalkyl radical having the following general formula (II):

##STR00002##

R.sub.2 being equally either an H or an alkyl radical containing between 1 and 6 carbon atoms; two R.sub.2 may be connected together via a covalent bond in order to form a cycle if they are alkyl radicals.

The invention also concerns their preparation method and their use in an absorbing solution based on amines in order to selectively eliminate H.sub.2S from a gaseous effluent containing H.sub.2S and CO.sub.2.

Ligand functionalized substrates, methods of making ligand functionalized substrates, and methods of using functionalized substrates are disclosed.

The present invention provides a method for treating clay-bearing aggregates, particularly those used for construction purposes, which involve introducing to clay-bearing aggregates an ion-exchanged polycondensate of dialkylamine and epichlorohydrin having anionic groups comprising both acetate and chloride ionic groups, wherein the acetate is present in an amount of 51-99 percent, and more preferably in the amount of 60-95 percent, based on molar concentration of the anionic groups, whereby chloride ionic groups are minimally present.

An oligomer-polymer is provided. The oligomer-polymer is obtained by the polymerization reaction of a compound containing an ethylenically unsaturated group and a nucleophile compound, wherein the nucleophile compound includes the compound shown in formula 1: ##STR00001##
A lithium battery including an anode, a cathode, an isolation film, an electrolyte solution, and a package structure is also provided, wherein the cathode includes the oligomer-polymer.

Ligand functionalized substrates, methods of making ligand functionalized substrates, and methods of using functionalized substrates are disclosed.

An oligomer-polymer is provided. The oligomer-polymer is obtained by the polymerization reaction of a compound containing an ethylenically unsaturated group and a nucleophile compound, wherein the nucleophile compound includes the compound shown in formula 1:

##STR00001##

A lithium battery including an anode, a cathode, an isolation film, an electrolyte solution, and a package structure is also provided, wherein the cathode includes the oligomer-polymer.

The present invention relates to a process for the preparation of Sevelamer carbonate from polyallylamine hydrochloride.

Guanidinyl ligand-functionalized polymers, methods of making the same, and substrates bearing a grafted coating of the ligand-functional polymers are described. The grafted polymer has the requisite affinity for binding neutral or negatively charged biomaterials, such as cells, cell debris, bacteria, spores, viruses, nucleic acids, endotoxins and proteins, at pH's near or below the pI's of the biomaterials.