IP Library › Granted Patent US 7,396,474
Granted Patent B2
US 7,396,474 · App. 11/269,357 · Granted Jul 8, 2008

Dual injection of two polymeric filtration aids for gypsum removal from phosphoric acid/gypsum slurry

Assignee: Arr-Maz Products, LP
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Quick Facts
Patent No.
US 7,396,474
App. No.
11/269,357
Granted
Jul 8, 2008
Kind
B2
Abstract

A process to improve the polymeric filtration aid performance used in removal of gypsum from phosphoric acid/gypsum slurry. A synergistic effect has been observed by using a Dual Injection method. This method more specifically involves using two polymers (A & B) of different chemistry and injecting into slurry at a different time. The polymer chemistry of filtration aid A is selected from the group consisting of non-ionic, anionic, and cationic polymers and the polymer chemistry of filtration aid B is selected from the group consisting of sulfonated polymers. The polymer (A & B) usage is reduced by around 50% and performance improved.

Claims (7)

1. A polymeric filtration aid method for gypsum removal from phosphoric acid/gypsum slurry, the method comprising:

a dual injection process where two different polymers are separately injected into a phosphoric acid/gypsum slurry at a different time, followed by filtration of gypsum solids from a liquid phosphoric acid,

wherein said phosphoric acid/gypsum slurry is produced from western phosphate ore obtained from mines in Idaho, and wherein the two different polymers are respectively comprised of different polymer chemistries of filtration aid A and B respectively, the polymer chemistry of filtration aid A being selected from the group consisting of non-ionic and anionic polymers produced from acrylamide and acrylic acid monomers, and the polymer chemistry of filtration aid B being selected from the group consisting of sulfonated polymers, wherein the sulfonated polymers comprise acrylamide tertialy-butyl (ATBS) and acrylamide or acrylic acid copolymers.

2. The method according to claim 1 , wherein polymer usage is reduced by about 50 percent from a single injection of a single polymer.

3. The method according to claim 1 , wherein the sulfonated polymer B is injected first and the polymer chemistry of filtration aid A is subsequently injected.

4. The method according to claim 3 , wherein a time interval between the injection of the polymer chemistry of filtration aids A and B is about 5-15 seconds.

5. The method according to claim 3 , wherein the sulfonated polymer B comprises an acrylamide tertialy-butyl sulfonic (ATBS) and acrylamide co-polymer.

Assignments (13)
CHANGE OF NAME Recorded Dec 14, 2022
From: ARR-MAZ PRODUCTS LP
To: ARRMAZ PRODUCTS INC.
Reel/Frame 062082/0725 →
RELEASE OF SECURITY INTEREST UNDER REEL/FRAME NO. 029529/0862 Recorded Jul 1, 2019
From: ANTARES CAPITAL LP
To: ARR-MAZ PRODUCTS, L.P.
Reel/Frame 049646/0588 →
ASSIGNMENT OF INTELLECTUAL PROPERTY SECURITY AGREEMENTS Recorded Jun 29, 2017
From: GENERAL ELECTRIC COMPANY, AS SUCCESSOR IN INTEREST BY MERGER TO GNEERAL ELECTRIC CAPITAL CORPORATION
To: ANTARES CAPITAL LP, AS ADMINISTRATIVE AGENT
Reel/Frame 043061/0511 →
RELEASE OF SECURITY INTEREST IN INTELLECTUAL PROPERTY AT REEL/FRAME NO. 027161/0320 Recorded Dec 24, 2012
From: GENERAL ELECTRIC CAPITAL CORPORATION
To: ARR-MAZ PRODUCTS, L.P.; ARR-MAZ CUSTOM CHEMICALS, INC.
Reel/Frame 029538/0945 →
RELEASE OF SECURITY INTEREST IN INTELLECTUAL PROPERTY COLLATERAL AT REEL/FRAME NO. 022659/0118 Recorded Dec 24, 2012
From: GENERAL ELECTRIC CAPITAL CORPORATION
To: ARR-MAZ PRODUCTS, L.P.; ARR-MAZ CUSTOM CHEMICALS, INC.; ARRMAZ SPECIALTY CHEMICALS, INC.
Reel/Frame 029539/0281 →
PATENT SECURITY AGREEMENT Recorded Dec 24, 2012
From: ARR-MAZ PRODUCTS, L.P.
To: GENERAL ELECTRIC CAPITAL CORPORATION
Reel/Frame 029529/0862 →
SECURITY AGREEMENT Recorded Nov 2, 2011
From: ARR-MAZ CUSTOM CHEMICALS, INC.; ARR-MAZ PRODUCTS, L.P.
To: GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT
Reel/Frame 027161/0320 →
CORRECTIVE ASSIGNMENT TO CORRECT THE CONVEYING PARTY DATA BY ADDING ARR-MAZ PRODUCTS, L.P., AS AN ASSIGNOR PREVIOUSLY RECORDED ON REEL 021354 FRAME 0202. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY INTEREST. Recorded May 8, 2009
From: ARR-MAZ PRODUCTS, L.P.
To: GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT
Reel/Frame 022659/0118 →
RELEASE OF SECURITY INTEREST Recorded Aug 7, 2008
From: UBS AG, STAMFORD BRANCH
To: CUSTOM CHEMICALS CORPORATION; ARR-MAZ PRODUCTS, L.P.; ARRMAZ SPECIALTY CHEMICALS, INC.
Reel/Frame 021354/0137 →
SECURITY AGREEMENT Recorded Aug 7, 2008
From: ARR-MAZ CUSTOM CHEMICALS, INC.; CUSTOM CHEMICALS CORPORATION; ARRMAZ SPECIALTY CHEMICALS, INC.
To: GENERAL ELECTRIC CAPITAL CORPORATION
Reel/Frame 021354/0202 →
CORRECTIVE ASSIGNMENT TO CORRECT THE SIGNATURE PAGES OF THE FIRST LIEN PATENT SECURITY AGREEMENT. PREVIOUSLY RECORDED ON REEL 018398 FRAME 0392. ASSIGNOR(S) HEREBY CONFIRMS THE ATTACHED DOCUMENTS ARE CORRECTED SIGNATURE PAGES.. Recorded Nov 21, 2006
From: CUSTOM CHEMICALS CORPORATION; ARR-MAZ PRODUCTS, L.P.; ARRMAZ SPECIALTY CHEMICALS, INC.
To: UBS AG, STAMFORD BRANCH, AS COLLATERAL AGENT
Reel/Frame 018535/0659 →
FIRST LIEN PATENT SECURITY AGREEMENT Recorded Oct 17, 2006
From: CUSTOM CHEMICALS CORPORATION; ARR-MAZ PRODUCTS, L.P.; ARRMAZ SPECIALTY CHEMICALS, INC.
To: UBS AG, STAMFORD BRANCH, AS COLLATERAL AGENT
Reel/Frame 018398/0392 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 21, 2005
From: IRWIN, LOUIS
To: ARR-MAZ PRODUCTS, L.P.
Reel/Frame 016803/0504 →
Continuity (1)
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