Method and apparatus for determining the presence or absence of a pour point depressant additive in hydrocarbon liquids
A method is described of determining the presence or absence of a pour point depressant additive in a hydrocarbon liquid derived from petroleum, the liquid containing paraffin wax, comprising the steps of: (a) cooling a sample of the liquid at a predetermined cooling rate from a temperature substantially above the cloud point temperature to a temperature substantially below the cloud point temperature; (b) monitoring the slope of the cooling rate curve and noting the points at which a deflection in the curve begins and ends; (c) determining the time interval between the beginning and ending points of the deflection of the curve, and (d) comparing the determined time interval to a reference time interval, associated with the predetermined cooling rate, so as to establish whether the determined time interval is less than or greater than the reference time interval thereby establishing the presence or absence, respectively, of a pour point depressant additive.
- Assignee:
- Citgo Petroleum Corp., Tulsa, OK
- Patent Number(s):
- US 4602870
- OSTI ID:
- 5351492
- Resource Relation:
- Patent File Date: Filed date 20 Sep 1984
- Country of Publication:
- United States
- Language:
- English
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