Branched/cross-linked cationic phenol-formaldehyde polymers useful in wastewater treatment
AssigneeNalco Chemical Company
InventorR. Selvarajan
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Abstract
Oily waste emulsions which cause low turbidity in industrial waste water effluents are successfully treated with cross-linked cationic polymeric compounds synthesized by reacting phenol, substituted phenol, formaldehyde and various low molecular weight polyamines having a preferred molecular weight of at least 1500 and not exceeding a molecular weight of about 30,000. The polyamines are derived from a base catalyzed polymerization of ammonia and ethylene dichloride or by the oligomerization of ethyleneimine.
Claims6
A process for removing turbidity from low turbidity industrial wastewaters which comprises treating said wastewaters by adding an effective turbidity removing amount of a water-soluble polymer to said wastewaters, admixing to flocculate the turbidity and then removing the flocculated turbidity, said water-soluble polymer consisting essentially of a reaction product of a phenol, formaldehyde, and a low molecular weight polyamine derived solely from reacting ammonia and ethylene dichloride to obtain a polyamine having a molecular weight between 500 and 500,000, said reaction product being obtained by reacting the phenol, formaldehyde, and polyamine in the following manner:
- A. Reacting the polyamine with formaldehyde to form methylolated polyamine;
- B. Reacting the thus formed methylolated polyamine with a phenol, in aqueous solution and under acidic conditions below a pH of 4.0 at an effective temperature and for a sufficient time to form said polymer;
- and
- C. Adding sufficient acid to render the polymer, in aqueous solution, fluid and homogeneous;
- said reaction being carried out at molar ratios of the phenol, formaldehyde, and polyamine of between 1:2:1.5 and 1:2:2.
A process for removing turbidity from low turbidity industrial wastewaters which comprises treating said wastewaters by adding an effective turbidity removing amount of water-soluble polymer to said wastewaters, admixing to flocculate the turbidity and then removing the flocculated turbidity, said water-soluble polymer consisting essentially of a reaction product of a phenol, formaldehyde, and tetraethylene pentamine, said reaction product being obtained solely by reacting the phenol, formaldehyde, and tetraethylene pentamine in the following manner:
- A. Reacting the tetraethylene pentamine with formaldehyde to form methylolated tetraethylene pentamine;
- B. Reacting the thus formed methylolated polyamine with a phenol, in aqueous solution, under acidic conditions below a pH of 4.0 at an effective temperature and for a sufficient time to form said polymer;
- and
- C. Adding sufficient acid to render the polymer in aqueous solution, fluid and homogeneous;
- said reaction being carried out at molar ratios of the phenol, formaldehyde, and polyamine between 2:1:4 and 2:1:5.
Dependencies are inferred from the claim text.