US4089703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot detergent process
Assignee: White Chemical Corp
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Filing: 1976-12-23
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Granted: 1978-05-16
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Expires: 1996-12-23
Abstract
Abstract Solid paraffin-containing material deposited on oil well surfaces are removed by contacting the deposited paraffin with an aqueous solution A composed of alkali metal metasilicate, tri(alkali metal) phosphate, tetrapotassium pyrophosphate, alkali metal hexametaphosphate, alkylphenol/ethylene oxide adduct, ethylene glycol monobutylether and methyl cellulose ether stabilizer and then adding to solution A, a solution B comprising concentrated sulfuric acid and a foam stabilizer.
Inventors
- 👤 Nelson Stanley White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:41
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0052; C11D3/02; C11D3/04; C11D3/042; C11D3/044; C11D3/06; C11D3/08; C23; C23G; C23G1/00; C23G1/14; C11D2111/00; C11D2111/10; C11D2111/14; C11D2111/20; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/929; Y10S507/931
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A hot detergent process for removing solid paraffin-containing material from surfaces which comprises contacting said paraffin-containing material with an aqueous solution (A) comprising, alkali metal metasilicate -- about 11-42% by weight tri(alkali metal) phosphate -- about 1-12% by weight tetrasodium pyrophosphate -- about 1-12% by weight alkali metal hydroxide -- about 2-22% by weight tetrapotassium pyrophosphate -- about 1-12% by weight alkali metal hexametaphosphate -- about 1-14% by weight alkylphenol-ethylene oxide condensation product -- about 7-34% by weight ethylene glycol monobutyl ether -- about 14-65% by weight methyl cellulose ether stabilizer -- about 1-67% by weight and then adding to solution (A) a solution (B) comprising concentrated sulfuric acid and a foam stabilizer, said solution (B) being added in amounts sufficient to initiate an exothermic reaction and to disperse said paraffin-containing material.
Claim 2
Dependent Claim
132 words
A hot detergent process for removing solid paraffin-containing material from surfaces which comprises contacting said paraffin-containing material with an aqueous solution (A) comprising, alkali metal metasilicate -- about 11-42% by weight tri(alkali metal) phosphate -- about 1-12% by weight tetrasodium pyrophosphate -- about 1-12% by weight alkali metal hydroxide -- about 2-22% by weight tetrapotassium pyrophosphate -- about 1-12% by weight alkali metal hexametaphosphate -- about 1-14% by weight alkylphenol-ethylene oxide condensation product -- about 7-34% by weight ethylene glycol monobutyl ether -- about 14-65% by weight methyl cellulose ether stabilizer -- about 1-67% by weight and then adding to solution (A) a solution (B) comprising concentrated sulfuric acid and a foam stabilizer, said solution (B) being added in amounts sufficient to initiate an exothermic reaction and to disperse said paraffin-containing material.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the alkali metal metasilicate is sodium metasilicate .5H 2 O.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the alkali metal hydroxide is solid sodium hydroxide.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the concentrated sulfuric acid is a sulfuric acid of 95-97% strength.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the solution (B) includes dibutylthiourea as a descaling additive.
Claim 7
Independent Claim
149 words
A method for treating a conduit for the transmission of a paraffinic petroliferous fluid in order to remove normally solid paraffin-containing materials deposited in said conduit which comprises contacting said deposited paraffin-containing material with an aqueous solution (A) comprising, alkali metal metasilicate -- about 25-35% by weight tri(alkali metal) phosphate -- about 5-10% by weight tetrasodium pyrophosphate -- about 5-10% by weight alkali metal hydroxide -- about 8-14% by weight tetrapotassium pyrophosphate -- about 5-10% by weight alkali metal hexametaphosphate -- about 7-12% by weight alkylphenol-ethylene oxide condensation Product -- about 15-25% by weight ethylene glycol monobutyl ether -- about 25-45% by weight methyl cellulose ether stabilizer -- about 2-4% by weight and then adding to solution (A) a solution (B) comprising concentrated sulfuric acid and a foam stabilizer, said solution B being added in amounts sufficient to initiate an exothermic reaction and to disperse said deposited paraffin-containing material.
Claim 8
Independent Claim
149 words
A method for treating a conduit for the transmission of a paraffinic petroliferous fluid in order to remove normally solid paraffin-containing materials deposited in said conduit which comprises contacting said deposited paraffin-containing material with an aqueous solution (A) comprising, alkali metal metasilicate -- about 25-35% by weight tri(alkali metal) phosphate -- about 5-10% by weight tetrasodium pyrophosphate -- about 5-10% by weight alkali metal hydroxide -- about 8-14% by weight tetrapotassium pyrophosphate -- about 5-10% by weight alkali metal hexametaphosphate -- about 7-12% by weight alkylphenol-ethylene oxide condensation Product -- about 15-25% by weight ethylene glycol monobutyl ether -- about 25-45% by weight methyl cellulose ether stabilizer -- about 2-4% by weight and then adding to solution (A) a solution (B) comprising concentrated sulfuric acid and a foam stabilizer, said solution B being added in amounts sufficient to initiate an exothermic reaction and to disperse said deposited paraffin-containing material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |