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Apparatus for quantitative determination of total base or acid number of oil

  • US 5,800,782 A
  • Filed: 09/12/1996
  • Issued: 09/01/1998
  • Est. Priority Date: 11/18/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining the quantity of acidic or basic resident species present in an oil sample, the apparatus comprising:

  • (a) sampling means for drawing a predetermined quantity of oil as a sample and introducing the sample into a reaction container;

    (b) a container system comprising;

    (i) a reactant container containing a predetermined quantity of a reactant species comprising one of an acidic species and a basic species, for reacting with a basic or acidic resident species in the sample, if any;

    (ii) an extractant container containing a predetermined quantity of an extractant in which the reactant species is soluble but which is immiscible with the sample, for extracting unreacted reactant species from the sample; and

    (iii) at least one reaction container dimensioned for receiving the sample from the sampling means and for receiving the predetermined quantity of the reactant species, to allow the reactant species to be mixed with the sample, and for receiving the extractant to allow the extractant to be mixed with, and to separate from, the sample to extract the unreacted reactant species from the sample;

    (c) pH measuring means for determining the pH of the extractant;

    wherein the pH measuring means comprises;

    (d) a titration syringe containing a titrant for the reactant species, for titrating a predetermined quantity of the extractant having unreacted reactant species therein; and

    (e) an indicator container containing a titration end point indicator for indicating the end point of the titration of the extractant with the titrant;

    wherein the at least one reaction container is dimensioned for further receiving the titrant and the end point indicator; and

    wherein the titration syringe bears graduations that are scaled and labeled to indicate one of the total base number and total acid number of the sample at the end point of the titration of reactant species in such predetermined quantity of extractant after reaction of said predetermined quantity of the reactant species with a sample drawn with the sampling means and extraction of remaining reactant therefrom by the extractant.

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