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Title: Acoustic-wave sensor apparatus for analyzing a petroleum-based composition and sensing solidification of constituents therein

An acoustic-wave sensor apparatus and method. The apparatus for analyzing a normally liquid petroleum-based composition includes at least one acoustic-wave device in contact with the petroleum-based composition for sensing or detecting the presence of constituents (e.g. paraffins or petroleum waxes) therein which solidify upon cooling of the petroleum-based composition below a cloud-point temperature. The acoustic-wave device can be a thickness-shear-mode device (also termed a quartz crystal mircrobalance), a surface-acoustic-wave device, an acoustic-plate-mode device or a flexural plate-wave device. Embodiments of the present invention can be used for measuring a cloud point, a pour point and/or a freeze point of the petroleum-based composition, and for determining a temperature characteristic of each point. Furthermore, measurements with the acoustic-wave sensor apparatus can be made off-line by using a sample having a particular petroleum-based composition; or in-situ with the petroleum-based composition contained within a pipeline or storage tank. The acoustic-wave sensor apparatus has uses in many different petroleum technology areas, including the recover transport, storage, refining and use of petroleum and petroleum-based products.
 [1];  [1];  [1]
  1. (Albuquerque, NM)
Issue Date:
OSTI Identifier:
Sandia Corporation (Albuquerque, NM) SNL
Patent Number(s):
US 5661233
Contract Number:
Research Org:
Country of Publication:
United States
acoustic-wave; sensor; apparatus; analyzing; petroleum-based; composition; sensing; solidification; constituents; therein; method; normally; liquid; device; contact; detecting; presence; paraffins; petroleum; waxes; solidify; cooling; below; cloud-point; temperature; thickness-shear-mode; termed; quartz; crystal; mircrobalance; surface-acoustic-wave; acoustic-plate-mode; flexural; plate-wave; embodiments; measuring; cloud; pour; freeze; determining; characteristic; furthermore; measurements; off-line; sample; particular; in-situ; contained; pipeline; storage; tank; technology; including; recover; transport; refining; products; flexural plate; acoustic-wave device; storage tank; sensor apparatus; quartz crystal; acoustic-wave sensor; petroleum-based composition; normally liquid; wave device; wave sensor; temperature characteristic; liquid petroleum-based; /73/166/356/374/