Solvent compositions for removing petroleum residue from a substrate and methods of use thereof

Patent metadata

Field	Value
Publication number	US-2021261889-A1
Application number	US-202117316987-A
Country	US
Kind code	A1
Filing date	May 11, 2021
Priority date	Mar 2, 2004
Publication date	Aug 26, 2021
Grant date	—

Abstract

A method of cleaning highway and road construction equipment is disclosed.

First claim

What is claimed is:

1 . A method of cleaning highway and road construction equipment comprising:
placing equipment on a perforated grid; spraying a biodegradable solvent composition with a spray gun under pressure on a residue containing equipment thereby forming an aqueous sludge, wherein the solvent composition has a pH of about 7; filtering the aqueous sludge through the perforated grid and thus separating insoluble contaminates; subjecting the filtered aqueous sludge to a compressed gas and thereby separating the solvent composition from the residue; and preparing the solvent composition for recycling or disposal, wherein the solvent composition comprises about 30-60 weight % of a biodiesel.

2 . The method of claim 1 , wherein the solvent composition comprises from about 40% to about 60% by weight of an aromatic ester.

3 . The method of claim 1 , wherein the solvent composition further comprises 40-60 weight % of an aromatic ester selected from the group consisting of: methyl benzoic acid ester, ethyl benzoic acid ester, n-propyl benzoic acid ester, isobutyl benzoic acid ester, n-butyl benzoic acid ester, tert-butyl benzoic acid ester, isomers of pentyl benzoic acid ester, isopropyl benzoic acid ester, and combinations thereof;

4 . The method of claim 1 , wherein the solvent composition further comprises 40-60 weight % of an aromatic ester, wherein the aromatic ester is isopropyl benzoic acid ester present in an amount of about 50 weight %,

5 . The method of claim 1 , further comprising a nonionic surfactant in an amount of about 0-20 weight %.

6 . The method of claim 1 , wherein the solvent composition further comprises about 0-10 weight % of diethylene glycol ether.

7 . The method of claim 1 , wherein the solvent composition further comprises about 0-20 weight % of a cyclic terpene or terpenoid.

8 . The method of claim 1 , wherein the solvent composition further comprises a corrosion inhibitor.

9 . The method of claim 1 , wherein the biodiesel is present in an amount of about 40 weight %.

10 . The method of claim 6 , wherein the and wherein the diethylene glycol ether is diethylene glycol monobutyl ether present in an amount of about 10 weight %.

Assignees

• Troxler Electronic Lab Inc

Inventors

• Troxler Robert Ernest
• Zaki Nael Naguib

Classifications

• C11D3/2041

  Dihydric alcohols · CPC title

• B08B3/024

  Cleaning by means of spray elements moving over the surface to be cleaned · CPC title

• C11D1/62

  Quaternary ammonium compounds · CPC title

• C11D1/74

  Carboxylates or sulfonates {esters} of polyoxyalkylene glycols · CPC title

• C11D7/248

  Terpenes · CPC title