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Title: Water treatment cuts deposition at oil and solvent recovery plant

Abstract

To accommodate its process water needs, the Oil and Solvent Process Company (OSCO) of Azusa, CA uses city water containing over 69 ppm calcium (as CaCO/sub 3/) and over 15 ppm silica. The company requires a flow rate of 1800 gpm to cool its evaporative condensers. The previous water treatment program was unsatisfactory and, because of this, many of the cooling water condensers at the plant would regularly clog due to deposition. Of specific concern are the water chemistry limits (and corresponding deposition) of: calcium carbonate, calcium sulfate, calcium phosphate, and silica. The chemical treatment program prescribed and initiated at OSCO includes: a molybdate-based mild steel corrosion inhibitor; a tolytrizole-based copper corrosion inhibitor, acid for pH control, chlorine and 1.5% chloromethylisothiazolin for bacterial control, and phosphonate and polyacrylate for inorganic antifouling. After over a year of operation under the prescribed chemical treatment program, OSCO has found that deposits have not occurred - even under operating conditions with calcium levels as high as 1850 ppm (as CaCO/sub 3/), a calcium sulfate multiplier exceeding 3.6 million, orthophosphate levels of 5 ppm (as PO/sub 4//sup =/), and silica levels as high as 315 ppm. There has been evidence that previous deposits have beenmore » removed. Condenser vacuums have subsequently risen from around 12'' to about 25'', effectively doubling production in the distillation condensers. Corrosion rates for mild steel, copper, and admiralty have been measured at below 2.1, 0.1, and 0.1 mpy, respectively with no signs of pitting. No observable chloride stress corrosion was noted in stainless steel.« less

Authors:
; ;
Publication Date:
Research Org.:
Oil and Solvent Process Co., Azusa, CA
OSTI Identifier:
5509555
Resource Type:
Journal Article
Journal Name:
Chem. Process. (Chicago); (United States)
Additional Journal Information:
Journal Volume: 48:12
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 36 MATERIALS SCIENCE; CALCIUM CARBONATES; DEPOSITION; CALCIUM PHOSPHATES; CALCIUM SULFATES; CORROSION INHIBITORS; PERFORMANCE; USES; SILICA; VAPOR CONDENSERS; CORROSION PROTECTION; FOULING; SCALING; COOLANTS; PH VALUE; WATER; WATER POLLUTION ABATEMENT; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATES; CHALCOGENIDES; CONDENSERS; HYDROGEN COMPOUNDS; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PHOSPHATES; PHOSPHORUS COMPOUNDS; POLLUTION ABATEMENT; SILICON COMPOUNDS; SILICON OXIDES; SULFATES; SULFUR COMPOUNDS; 520200* - Environment, Aquatic- Chemicals Monitoring & Transport- (-1989); 360105 - Metals & Alloys- Corrosion & Erosion

Citation Formats

Guevara, N Jr, Weir, G, and Toy, D A. Water treatment cuts deposition at oil and solvent recovery plant. United States: N. p., 1985. Web.
Guevara, N Jr, Weir, G, & Toy, D A. Water treatment cuts deposition at oil and solvent recovery plant. United States.
Guevara, N Jr, Weir, G, and Toy, D A. Tue . "Water treatment cuts deposition at oil and solvent recovery plant". United States.
@article{osti_5509555,
title = {Water treatment cuts deposition at oil and solvent recovery plant},
author = {Guevara, N Jr and Weir, G and Toy, D A},
abstractNote = {To accommodate its process water needs, the Oil and Solvent Process Company (OSCO) of Azusa, CA uses city water containing over 69 ppm calcium (as CaCO/sub 3/) and over 15 ppm silica. The company requires a flow rate of 1800 gpm to cool its evaporative condensers. The previous water treatment program was unsatisfactory and, because of this, many of the cooling water condensers at the plant would regularly clog due to deposition. Of specific concern are the water chemistry limits (and corresponding deposition) of: calcium carbonate, calcium sulfate, calcium phosphate, and silica. The chemical treatment program prescribed and initiated at OSCO includes: a molybdate-based mild steel corrosion inhibitor; a tolytrizole-based copper corrosion inhibitor, acid for pH control, chlorine and 1.5% chloromethylisothiazolin for bacterial control, and phosphonate and polyacrylate for inorganic antifouling. After over a year of operation under the prescribed chemical treatment program, OSCO has found that deposits have not occurred - even under operating conditions with calcium levels as high as 1850 ppm (as CaCO/sub 3/), a calcium sulfate multiplier exceeding 3.6 million, orthophosphate levels of 5 ppm (as PO/sub 4//sup =/), and silica levels as high as 315 ppm. There has been evidence that previous deposits have been removed. Condenser vacuums have subsequently risen from around 12'' to about 25'', effectively doubling production in the distillation condensers. Corrosion rates for mild steel, copper, and admiralty have been measured at below 2.1, 0.1, and 0.1 mpy, respectively with no signs of pitting. No observable chloride stress corrosion was noted in stainless steel.},
doi = {},
journal = {Chem. Process. (Chicago); (United States)},
number = ,
volume = 48:12,
place = {United States},
year = {1985},
month = {10}
}