Barium sulfate removal and anti-deposition compositions and process of use therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 24, 1987
Grant Date -
N/A
app pub date -
Nov 24, 1986
filing date -
Nov 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention provides a process for the sequestration of barium sulfate scale and barium sulfate sequestrant compositions therefor comprising an aqueous solution of citric acid (CA), a polycarbazic acid (PA), and an alklyenepolyaminopolycarboxylic acid (APAPCA), the weight ratio of CA to APAPCA being in the range from about 0.5 to 1 to about 11 to 1 and the weight ratio of PCA to APAPCA being in the range from about 0.002 to about 0.2, wherein the polycarbazic acid has the formula (R).sub.2 --N--[CH.sub.2 CH.sub.2 N(R)].sub.m --R where R is the group CH.sub.2 --CO--NH--NH--COOH and m is 0 or an integer from 1 to about 4, and wherein the APAPCA has the formula (HOOC--CH.sub.2).sub.2 --N--[CH.sub.2 --CH.sub.2 --N(CH.sub.2 --COOH)].sub.n --CH.sub.2 COOH where n is an integer from 1 to about 4. The preferred aqueous sequestering solution has a pH in the range from about 9.5 to about 14, said pH being provided by a base selected from the group consisting of potassium hydroxide, potassium carbonate, and mixtures thereof.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully