IP Library Granted Patent US 12692457
Granted Patent B2
US 12692457 · App. 18/662,825 · Granted Jul 28, 2026

Solar panel cleaning formulation

Inventors: Palanisamy Ravichandiran (Bengaluru, IN); Pankaj Patel (Bengaluru, IN); Siva Kesava Raju Chinthalapati (Bengaluru, IN); Sheshachala Srinivasa Narasimha (Bengaluru, IN)
Assignee: HINDUSTAN PETROLEUM CORPORATION LIMITED
C11D1/29C11D3/042C11D3/2082C11D3/24C11D3/323C11D3/349C11D3/43C11D3/48C11D17/0008C11D2111/22
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Quick Facts
Patent No.
US 12692457
App. No.
18/662,825
Granted
Jul 28, 2026
Kind
B2
Abstract

Solar panel cleaning formulations are disclosed herein. In accordance with some aspects, provides is a solar panel cleaning formulation that comprises a surfactant, urea, a mild acid, an antimicrobial agent and water. In some cases, the solar panel cleaning formulation comprises an antimicrobial agent comprising a novel antibacterial compound disclosed herein.

Claims (22)

1 . A solar panel cleaning formulation, comprising: a surfactant, urea, a mild acid, an antimicrobial agent, and water, wherein the surfactant is in a range of 0.6-0.8 wt. %, the urea is in a range of 0.2-0.3 wt. %, the mild acid is in a range of 0.6-0.7 wt. %, the antimicrobial agent is in a range of 0.1-0.2 wt. %, and water is 98 wt. %, wherein all weight percentages are based on a total weight of the solar panel cleaning formulation.

2 . The solar panel cleaning formulation as claimed in claim 1 , wherein the surfactant includes one or more cationic surfactants or anionic surfactants selected from the group consisting of behentrimonium chloride, benzalkonium chloride, benzethonium chloride, benzododecinium bromide, carbethopendecinium bromide, cetalkonium chloride, cetrimide, cetrimonium bromide, cetrimonium chloride, cetylpyridinium chloride, didecyldimethylammonium chloride, dimethyldioctadecylammonium bromide, dimethyldioctadecylammonium chloride, dioleoyl-3-trimethylammonium propane, domiphen bromide, ethyl lauroyl arginate, lauryl methyl gluceth-10 hydroxypropyl dimonium chloride, octenidine dihydrochloride, olaflur, n-oleyl-1,3-propanediamine, pahutoxin, stearalkonium chloride, tetramethylammonium hydroxide, thonzonium bromide, 2-acrylamido-2-methylpropane sulfonic acid, alkylbenzene sulfonate, ammonium lauryl sulfate, ammonium perfluorononanoate, chlorosulfolipid, disodium cocoamphodiacetate, docusate, magnesium laureth sulfate, α-olefin sulfonate, perfluorobutanesulfonic acid, perfluorodecanoic acid, perfluorohexanesulfonic acid, perfluorononanoic acid, perfluorooctanesulfonic acid, perfluorooctanoic acid, perfluoropropanesulfonic acid, phospholipid, potassium lauryl sulfate, sodium dodecyl sulfate, sodium laurate, sodium lauryl ether sulfate, sodium lauroyl sarcosinate, sodium myreth sulfate, sodium nonanoyloxybenzenesulfonate, sodium pareth sulfate, sodium stearate, sodium sulfosuccinate esters, sodium tetradecyl sulfate, sulfolipid, cetyltrimethyl ammonium bromide, and a combination thereof.

3 . The solar panel cleaning formulation as claimed in claim 1 , wherein the mild acid includes one or more selected from the group consisting of acetic acid, citric acid, formic acid, o-phosphoric acid, acetylsalicylic acid, carbonic acid, phosphorous acid, and a combination thereof.

4 . The solar panel cleaning formulation as claimed in claim 1 , wherein the antimicrobial agent is selected from the group consisting of chloramphenicol, macrolides, tetracycline, aminglycoside, beta-lactam derivatives, ketoconazole, miconazole, penicillin, sulphonamides, vancomycin, phenothiazines, phenoxazines, carbazole, and a combination thereof.

5 . The solar panel cleaning formulation as claimed in claim 1 , wherein the formulation comprises cetyl pyridinium chloride, sodium lauryl ether sulfate, urea, citric acid, phosphoric acid, phenothiazine based antimicrobial agent, and water.

6 . The solar panel cleaning formulation as claimed in claim 1 , wherein the formulation comprises cetyltrimethyl ammonium bromide, sodium lauryl ether sulfate, urea, citric acid, phosphoric acid, phenothiazine based antimicrobial agent, and water.

7 . The solar panel cleaning formulation as claimed in claim 1 , wherein the antimicrobial agent is 4-(tert-butyl)-N-(4-(4-(5-oxo-5H-benzo[a]phenothiazin-6-ylamino)phenylsulfonyl)phenyl) benzamide.

8 . A compound of formula (5);

9 . A process for preparing a compound as claimed in claim 8 , the process comprising;

a) adding 2,3-dichloro-1,4-naphthoquinone, 4-aminophenyl sulfone, and 900 mL double distilled deionized water to obtain a first reaction mixture;

b) refluxing the first reaction mixture for 3 hours to obtain a 2-((4-((4-aminophenyl) sulfonyl)phenyl)amino)-3-chloronaphthalene-1,4-dione compound;

c) dissolving the 2-((4-((4-aminophenyl) sulfonyl)phenyl)amino)-3-chloronaphthalene-1,4-dione compound compound and 2-aminothiophenol in 500 mL of acetonitrile to obtain a second reaction mixture;

d) refluxing the second reaction mixture with potassium carbonate for 2 hours to obtain a 6-(4-(4-aminophenylsulfonyl)phenylamino)-5H-benzo[a]phenothiazin-5-one compound;

e) dissolving the 6-(4-(4-aminophenylsulfonyl)phenylamino)-5H-benzo[a]phenothiazin-5-one compound and 4-tert-butylbenzoyl chloride in 250 ml of dried acetone to obtain a third reaction mixture;

f) refluxing the third reaction mixture for 30 minutes by constant stirring to obtain the compound of Formula (5).

10 . A solar panel cleaning formulation, comprising: a surfactant, urea, a mild acid, an antimicrobial agent, and water, wherein the antimicrobial agent is 4-(tert-butyl)-N-(4-(4-(5-oxo-5H-benzo[a]phenothiazin-6-ylamino)phenylsulfonyl)phenyl) benzamide.

11 . The solar panel cleaning formulation as claimed in claim 10 , wherein the antimicrobial agent is present in a range of 0.1-0.2 wt. %, based on a total weight of the solar panel cleaning formulation.

12 . The solar panel cleaning formulation as claimed in claim 10 , wherein the antimicrobial agent is present in a range of 0.1-0.2 wt. %, based on a total weight of the solar panel cleaning formulation.

13 . The solar panel cleaning formulation as claimed in claim 10 , wherein the surfactant is present in a range of 0.6-0.8 wt. %, based on a total weight of the solar panel cleaning formulation.

14 . The solar panel cleaning formulation as claimed in claim 10 , wherein the urea is present in a range of 0.2-0.3 wt. %, based on a total weight of the solar panel cleaning formulation.

15 . The solar panel cleaning formulation as claimed in claim 10 , wherein the mild acid is present in a range of 0.6-0.7 wt. %, based on a total weight of the solar panel cleaning formulation.

16 . The solar panel cleaning formulation as claimed in claim 10 , wherein the surfactant includes one or more cationic surfactants or anionic surfactants selected from the group consisting of behentrimonium chloride, benzalkonium chloride, benzethonium chloride, benzododecinium bromide, carbethopendecinium bromide, cetalkonium chloride, cetrimide, cetrimonium bromide, cetrimonium chloride, cetylpyridinium chloride, didecyldimethylammonium chloride, dimethyldioctadecylammonium bromide, dimethyldioctadecylammonium chloride, dioleoyl-3-trimethylammonium propane, domiphen bromide, ethyl lauroyl arginate, lauryl methyl gluceth-10 hydroxypropyl dimonium chloride, octenidine dihydrochloride, olaflur, n-oleyl-1,3-propanediamine, pahutoxin, stearalkonium chloride, tetramethylammonium hydroxide, thonzonium bromide, 2-acrylamido-2-methylpropane sulfonic acid, alkylbenzene sulfonate, ammonium lauryl sulfate, ammonium perfluorononanoate, chlorosulfolipid, disodium cocoamphodiacetate, docusate, magnesium laureth sulfate, α-olefin sulfonate, perfluorobutanesulfonic acid, perfluorodecanoic acid, perfluorohexanesulfonic acid, perfluorononanoic acid, perfluorooctanesulfonic acid, perfluorooctanoic acid, perfluoropropanesulfonic acid, phospholipid, potassium lauryl sulfate, sodium dodecyl sulfate, sodium laurate, sodium lauryl ether sulfate, sodium lauroyl sarcosinate, sodium myreth sulfate, sodium nonanoyloxybenzenesulfonate, sodium pareth sulfate, sodium stearate, sodium sulfosuccinate esters, sodium tetradecyl sulfate, sulfolipid, cetyltrimethyl ammonium bromide, and a combination thereof.