IP Library › Granted Patent US 8,182,698
Granted Patent B2
US 8,182,698 · App. 12/828,061 · Granted May 22, 2012

Method for improving gypsum/phosphoric acid slurry filtration using carboxymethyl cellulose

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Quick Facts
Patent No.
US 8,182,698
App. No.
12/828,061
Granted
May 22, 2012
Kind
B2
Abstract

A chemical process to improve the filtration performance for the removal of gypsum from phosphoric acid/gypsum slurry using a filtration aid that is selected from a class of polymers, lower molecular weight anionic polyelectrolytes, which previously have not been used for this application. The polymer is CMC or Carboxymethyl Cellulose, which is a polymerized cellulose ether. CMC is found to be extremely effective for phosphoric acid/gypsum slurry that was produced from igneous phosphate rock. CMC is also available in food grade, which is novel for filtration aids for the production of phosphoric acid which may be used for human or animal feed.

Claims (12)

1. A method for increasing phosphoric acid production obtained from a phosphoric acid slurry derived from igneous rock, the method comprising:

injecting a CMC polymer solution into a 25-45% phosphoric acid slurry derived from igneous rock, the CMC polymer usage being 5-40 ppm,

wherein the CMC polymer is carboxymethylcellulose comprising a polymerized cellulose ether,

wherein the production rate of phosphoric acid derived from the slurry is increased.

2. The method according to claim 1 , wherein said CMC polymer at 99.5% dry basis active is a food grade polymer filtration aid.

3. The method according to claim 1 , wherein said CMC polymer is an anionic polyelectrolyte with a low polymer molecular weight of 600,000-900,000.

4. The method according to claim 1 , wherein said CMC polymer at 60-99.4% dry basis active is a technical grade polymer.

5. The method according to claim 1 , wherein the CMC polymer improves filtration rate performance over standard 10-20 million high molecular weight PAM polymers.

6. A method for increasing phosphoric acid production obtained from a phosphoric acid slurry derived from sedimentary rock, the method comprising:

injecting a standard high molecular weight polymer (A) and a CMC polymer (B) into a 25-45% phosphoric acid slurry derived from sedimentary rock,

wherein the CMC polymer is carboxymethylcellulose comprising a polymerized cellulose ether,

wherein the production rate of phosphoric acid derived from the slurry is increased.

Assignments (8)
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. 029538/0691 Recorded Jul 1, 2019
From: ANTARES CAPITAL LP
To: ARR-MAZ CUSTOM CHEMICALS, INC.
Reel/Frame 049645/0931 →
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 →
PATENT SECURITY AGREEMENT Recorded Dec 24, 2012
From: ARR-MAZ CUSTOM CHEMICALS, INC.
To: GENERAL ELECTRIC CAPITAL CORPORATION
Reel/Frame 029538/0691 →
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 →
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 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 30, 2010
From: IRWIN, LOUIS
To: ARR-MAZ CUSTOM CHEMICALS, INC.
Reel/Frame 024620/0531 →