Elemental sulfur analysis in fluids

Patent metadata

Field	Value
Publication number	US-12326437-B2
Application number	US-202318335664-A
Country	US
Kind code	B2
Filing date	Jun 15, 2023
Priority date	Oct 4, 2019
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

Robust methods for quantitating the amount of elemental sulfur in a fluid whereby a caustic solution is mixed with the fluid, and the elemental sulfur present in the fluid reacts to form a colored solution that can be compared to a series of standards. The methods can be performed in a laboratory or the field and allow for real time feedback. Once the concentration of the elemental sulfur is known, appropriate methods of treatment can proceed. Test kits for performing the methods in the field are also described.

First claim

The invention claimed is:

1. An elemental sulfur test kit comprising a storage container comprising:
a) a first container containing a solution having a known amount of a caustic chemical comprising tetrabutylammonium hydroxide;
b) a second container containing a known amount of a hydrocarbon solvent;
c) a third container containing a known amount of an alcohol;
d) a fourth container containing a known concentration of elemental sulfur; and
e) a set of instructions for mixing said caustic chemical, said hydrocarbon solvent, said alcohol, and a fluid selected from the group consisting of gasoline, jet fuel, kerosene, condensates, black oils, solid hydrocarbons solubilized in liquid hydrocarbons, produced water, and combinations thereof, and using said known concentration of elemental sulfur to determine an amount of elemental sulfur in said fluid.

2. The test kit of claim 1 , said storage container further comprising a plurality of cuvettes and a plurality of pipettes for transferring solutions into the plurality of cuvettes, wherein each cuvette of said plurality of cuvettes has a cap such that it said cuvette can be used for mixing at least two of said caustic chemical, said hydrocarbon solvent, said alcohol, and said known concentration of elemental sulfur.

3. The test kit of claim 1 , wherein:
said hydrocarbon solvent is selected from a group consisting of gasoline, diesel, kerosene, hexane, benzene, toluene, xylene, heavy aromatic naphtha, mixtures of naphtha and naphthalene, and naphthalene, and
said alcohol is selected from a group consisting of methanol, ethanol, isopropyl alcohol, and butanol.

4. The test kit of claim 1 , wherein said alcohol is a C1-C4 alcohol.

5. The test kit of claim 1 , wherein said hydrocarbon solvent is toluene.

6. An elemental sulfur test kit comprising a storage container comprising:
a) a first container containing a caustic solution having a known amount of a caustic chemical comprising tetrabutylammonium hydroxide in a known amount of an alcohol;
b) a second container containing a known amount of a hydrocarbon solvent;
c) a third container containing a known amount of elemental sulfur; and
d) a set of instructions for using said caustic solution, said hydrocarbon solvent, and said known amount of elemental sulfur to determine an amount of elemental sulfur in a fluid, said fluid selected from the group consisting of gasoline, jet fuel, kerosene, condensates, black oils, solid hydrocarbons solubilized in liquid hydrocarbons, produced water, and combinations thereof.

7. The test kit of claim 6 , said caustic solution comprising tetrabutylammonium hydroxide and C1-C4 alcohol.

8. The test kit of claim 6 , said caustic solution being comprising tetrabutylammonium hydroxide and C1-C4 alcohol and said hydrocarbon solvent being toluene.

9. An elemental sulfur test kit comprising a storage container comprising:
a) a first container containing a caustic solution, said caustic solution comprising tetrabutylammonium hydroxide, a C1-C4 alcohol and a hydrocarbon solvent;
b) a second container containing a known amount of elemental sulfur; and
c) a set of instructions for using said caustic solution and said known amount of elemental sulfur to determine an amount of elemental sulfur in a fluid, said fluid selected from the group consisting of gasoline, jet fuel, kerosene, condensates, black oils, solid hydrocarbons solubilized in liquid hydrocarbons, produced water, and combinations thereof.

10. The test kit of claim 9 , said hydrocarbon solvent being toluene.

Assignees

• Conocophillips Co

Inventors

• Locklear Jay
• Crowe Clinton

Classifications

• Y10T436/109163

  Inorganic standards or controls · CPC title

• Y10T436/188

  Total or elemental sulfur · CPC title

• G01N21/75

  Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated (systems in which material is burnt in a flame or plasma G01N21/72, G01N21/73) · CPC title

• G01N31/22

  using chemical indicators (G01N31/02 takes precedence) · CPC title

• G01N21/78

  producing a change of colour · CPC title