Agitating – Having specified feed means – Responsive to condition sensor
Patent
1997-09-10
1999-11-30
Cooley, Charles E.
Agitating
Having specified feed means
Responsive to condition sensor
3661602, B01F 1504
Patent
active
059930543
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a system and to a method for blending additives with a main stream of a liquid, particularly but not exclusively where the liquid is an oleaginous liquid.
BACKGROUND OF THE INVENTION
Oleaginous materials such as crude oils, lubricating oils, heating oils and other distillate petroleum fuels, for example diesel fuels, contain alkanes that at low temperature tend to precipitate as large crystals of wax forming a gel structure so that the fuel or oil loses its ability to flow. The lowest temperature at which the crude oil, lubricating oil or fuel oil will still flow is known as the pour point. In the case of fuels as the temperature of the fuel falls and approaches the pour point, difficulties arise in transporting the fuel through lines and pumps. Further, the wax crystals tend to plug fuel lines, screens and filters at temperatures above the pour point. These problems are well recognized in the art, and various additives have been proposed, many of which are in commercial use, for depressing the pour point of fuel oils. Similarly, other additives have been proposed and are in commercial use, for reducing the size and changing the shape of the wax crystals that do form. Other additives may also retain wax crystals in suspension, and may be referred to as anti-settling aids. Additives may also be added to improve other properties of the fuel oil, for example to act as corrosion inhibitors, or detergents or to inhibit sediment formation.
The invention is relevant but not restricted to fuel oils, including those boiling in the gasoline range, but is particularly relevant to those liquids referred to as middle distillate fuel oils. These fuel oils typically boil in the range of about 120.degree. C. to about 500.degree. C., and may comprise atmospheric distillate or vacuum distillate, or cracked gas oil, or a mixture of straight-run and cracked distillates. The most common petroleum distillate fuel oils are kerosene, jet fuels, diesel fuels, and heating oils. In any event it is almost always necessary to add a small proportion, for example between 10 and 2,000 ppm by weight, of additives to the liquid as produced by a refinery, in order to produce a fuel or oil which is suitable for sale and meets desired specifications. Typically a refiner would use one additive composition for all fuels or might, in some cases, use one additive composition (A) if producing diesel fuel, or a different additive composition (B) if producing heating oil; each additive composition (A or B) comprising a mixture of the chemically-different types of additive discussed above, chosen to ensure the desired specification is met. Where the characteristics of the untreated fuel oil vary (due for example to changes in refinery operation or changes in crude oil), the refiner ensures that the desired specification continues to be met by adjusting the proportion of the additive composition (say A) which is added. In the same way the refiner can produce fuel oils which meet different specifications, for example for use in different climates, by adjusting the proportion of the additive composition (say A) which is added.
SUMMARY OF THE INVENTION
According to the present invention there is provided a system for blending additives with a main stream of liquid, the system comprising a plurality of containers for different additive compositions, means to inject into the main stream of liquid at least two additive compositions from the containers, and means to adjust, during operation, the rates of injection and the relative proportions of the different additive compositions which are injected.
Each additive composition may comprise one or more chemically-different additives as discussed above, for example a selection of pour-point depressants, wax anti-settling agents, wax crystallization modifiers, corrosion inhibitors etc. and may contain co-additives which improve the effectiveness of one or other of the additives. These components may be in admixture with a carrier liquid, e.g. dissolv
REFERENCES:
patent: 2917465 (1959-12-01), Begley
patent: 3608869 (1971-09-01), Woodle
patent: 3702619 (1972-11-01), Son
patent: 4403866 (1983-09-01), Falcoff et al.
patent: 4427298 (1984-01-01), Fahy et al.
patent: 4475821 (1984-10-01), Koch et al.
patent: 4621927 (1986-11-01), Hiroi
patent: 4684488 (1987-08-01), Rudolph
patent: 4706892 (1987-11-01), Klose
patent: 4964732 (1990-10-01), Cadeo et al.
patent: 5295505 (1994-03-01), Polaschegg et al.
patent: 5312595 (1994-05-01), Moffett et al.
patent: 5332311 (1994-07-01), Volk, Jr. et al.
Baracchini Francesco L
Davies Brian William
Tan Gerard BH
Cooley Charles E.
Exxon Chemical Patents Inc.
LandOfFree
System and method for continuously and simultaneously injecting does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for continuously and simultaneously injecting , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for continuously and simultaneously injecting will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1663874