Daniel Glen Vaughan

US Patent:

51183994, Jun 2, 1992

Filed:

Aug 29, 1989

Appl. No.:

7/399936

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

B01D 6144
C02F 1469
C25B 700

US Classification:

2041824

Abstract:

A multivalent metal hydroxide is separated as a solid from an alkali hydroxide or from another multivalent metal hydroxide in an electrodialytic cell. The separation process is regulated by varying the pH or concentration of alkali hydroxide in a feed compartment electrolyte by matching the rate alkali cations are fed and removed from the electrolyte. As a result, one multivalent metal cation separates as a solid in the feed electrolyte or one multivalent cation separates as a solid and one multivalent cation is ionically mobile and electrotransportable from the electrolyte. This electrodialytic method can be used to continuously regenerate sodium hydroxide etchants containing dissolved aluminum, when the dissolved aluminum is removed from the etchant as a solid and the sodium hydroxide is returned as a solution for etching.

US Patent:

47505257, Jun 14, 1988

Filed:

Apr 15, 1985

Appl. No.:

6/722948

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

B65D 4532
F16L 2108

US Classification:

138 89

Abstract:

The ends of flexible plastic tubes, particularly of relatively thin thickness, are closed with a cylindrical header or end plug over which an end of the plastic tube is fitted. A fluids connection between the wall of the plastic tube and the cylindrical header or plug is made by press fitting over the connection area a plastic ring smaller in diameter than the outside diameter of the plastic tube within the elastic limit of the plastic ring. Preferably the header and/or end plug have circumferential grooves or depressions into which groove or depression the wall of the tube is fitted or depressed, preferably by multi-turns of plastic threads. For corrosive and oxidizing environments the header, plug, plastic tube, sealing rings and depressing thread are composed of perfluorocarbon polymers.

US Patent:

46844538, Aug 4, 1987

Filed:

Jan 21, 1986

Appl. No.:

6/819931

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

B01D 5702
C23C 2286
C09B 6754

US Classification:

2041824

Abstract:

An electrolytic purification process useful for contaminated solutions of oxygen-sensitive organic dyes and other such sensitive organic materials and metal chelates and complexes of organic materials involves applying an electrical potential to said solutions in an intermediate or feed compartment separated by cation permeable membranes from an anolyte compartment having an anode and an acidic aqueous anolyte and from a catholyte compartment having a cathode and an aqueous catholyte whereby the impressed electrical current causes metal cations to be electrotransported through the cation permeable membrane into the catholyte and the solution of oxygen- or hydrogen-sensitive organic material is purified without exposure to the anode or oxygen formed at the anode or to the cathode or hydrogen formed in the catholyte compartment. A special embodiment comprises treating solutions of oxygen- or hydrogen-sensitive organic materials first with a salt of a multivalent metal cation to insolubilize such organic materials, separating the insolubilized organic material from unwanted substances such as large volumes of water found in dilute solutions of the desired organic material or other substances encountered in the solutions, dissolving the separated insolubilized organic material in an acidic aqueous solution and removing the multivalent metal cations by electrotransport thereof through a cation permeable membrane into a catholyte as described in the above described electrolytic purification process.

US Patent:

52581098, Nov 2, 1993

Filed:

Mar 29, 1991

Appl. No.:

7/677524

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

C25C 100

US Classification:

204151

Abstract:

Complexes and salts of metal cations and acid anions are electrodialytically converted into insoluble hydroxides of the metal cations and acids of the anions. The conversion is effected without the electrotransport of metal cations by insolubilizing the metal cations with hydroxyl ions formed in a catholyte separated by a cation permeable membrane from an anolyte and converting anions of alkali salts formed in the catholyte to acids in the anolyte. The process comprises (a) feeding a solution of a metal complex or salt to a catholyte containing alkali cations; (b) forming hydroxyl ions in the catholyte to form insoluble metal hydroxides and alkali salts of acid anions; (c) separating the insoluble hydroxide from the catholyte; (d) feeding the separated catholyte to the anolyte whereby alkali cations are electrotransported from the anolyte to the catholyte.

US Patent:

51416107, Aug 25, 1992

Filed:

May 11, 1990

Appl. No.:

7/522083

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

B01D 6144
C02F 1469
C25B 700

US Classification:

2041824

Abstract:

A solution, sol or colloidal dispersion of a substantially water insoluble metal hydroxide or acid and an alkali metal hydroxide are electrodialytically converted to a solid substantially water insoluble metal hydroxide or acid and a solution of the alkali metal hydroxide substantially free of the water insoluble metal hydroxide or acid. The conversion is effected by electrodialysis and electrotransport of an alkali metal cation from the solution, sol or dispersion through a cation permeable membrane into an aqueous alkali hydroxide solution and by using a water soluble anion of an acid to vary pH of the solution sol or dispersion to insolubilize the water insoluble metal hydroxide or acid. Sodium hydroxide etchants of aluminum are continously converted to solid aluminum hydroxide and aqueous sodium hydroxide free of aluminum hydroxide.

US Patent:

54198216, May 30, 1995

Filed:

Jun 4, 1993

Appl. No.:

8/070965

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

B01D 6144

US Classification:

2041824

Abstract:

Process and equipment for reforming and maintaining the chemistry of an electroless metal bath, particularly an electroless nickel bath is disclosed.

US Patent:

46362886, Jan 13, 1987

Filed:

Oct 26, 1984

Appl. No.:

6/665052

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

B01D 1302

US Classification:

2041824

Abstract:

Salts of multivalent cations in aqueous solution, with or without admixture with salts of monovalent cations, are converted into the respective acids or halogens of the anions of the salts and into water insoluble salts or ionically immobile compounds of the multivalent cations. The conversion is effected by electrodialysis and electrotransport of the multivalent cations through a cation permeable membrane into aqueous solutions containing both agents that insolubilize or ionically immobilize the multivalent cations and a soluble salt of an acid, which acid in a one normal solution would have a pH no greater than three and forms water soluble salt with the multivalent cation. The use of the added salt in the solution into which the multivalent cations are electrotransported minimizes fouling of the membrane and makes the electrodialytic conversion efficient and with high capacity.

US Patent:

52640973, Nov 23, 1993

Filed:

Mar 29, 1991

Appl. No.:

7/677525

Inventors:

Daniel J. Vaughan - Wilmington DE

International Classification:

B01D 6100

US Classification:

2041824

Abstract:

Complexes and salts of metal cations in aqueous solutions are electrodialytically converted into a solution of acids substantially free of metal cations and insoluble metal hydroxides. Metal cations are insolubilized by hydroxyl ions formed in a catholyte while anions are electrotransported from the catholyte and converted into a solution of acids by hydrogen ions formed in an anolyte of an electrodialytic process. The conversion process is carried out electrically without the electrotransport of metal cations and is especially useful for reforming solutions of acids that form complexes when etching and finishing metal surfaces.