Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3700587 A
Publication typeGrant
Publication dateOct 24, 1972
Filing dateMar 1, 1971
Priority dateMar 1, 1971
Publication numberUS 3700587 A, US 3700587A, US-A-3700587, US3700587 A, US3700587A
InventorsHyde James A
Original AssigneeNalco Chemical Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Silicone oil antifoam
US 3700587 A
Abstract  available in
Images(3)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Oct. 24, 1972 J. A. HYDE SILICONE OIL ANTIFOAM 3 Sheets-Sheet 1 Filed March 1, 1971 ANTIFOAM ACTIVITY OF DIFFERENT VISCOSITY SILICONES Silicone dose of .4ppm

60,000 cstk. Silicone x Silicone dilution of ltol [50,000 cstK. SaliconeA l o e od n .80 3

m w h Q 5 A 3 mfitu 2 Z- kt mt SE0.

o TIME IN SECONDS secono 00 SE OF $lLlCONE- Oct. 24, 1972 J. A. HYDE SILICONE OIL ANTIFOAM Filed March 1, 1971 3 Sheets-Sheet 2 ANTI FOAM ACTIVITY OF DIFFERENT VlSCOSITY SILICONES FIG I AS A FUNCTION OFTIME 150.000 csfk. snucone A SlLlCONE DOSE os=.24 PPm 400,000 cs'bK SlLlCONE 0 mucous DILUTIONOF.

l'l'o 250 MWtUrZ ktmzmrt ITO.

TIME IN SECONDS FIRST DOSE OF SILJCONE FIG.11A

o a r .m 0 Em Mn 8 v A n s n I e m I O. I J v w L 1 4 w O l I I I N S 2; A 2 E E I! s an m D O D E //,U,, M m 4 T a a o s A I. 7 6 5 A. 3 7- .wwtus lctmiwt $33k 3 Sheets-Sheet" 5 Filed March 1. 1971 ANTIFOAM ACTIVITY OF DIFFERENT VISCOSITY SILICONES A5 A FUNCTION OF TIME 5 I 0 mm a p m w n o d m w e e n n m 0 MM 0 1. I 5 $3 I I OX U O m w M 4 o O o c c c UH... 9 5 in w. kk k 3 C C C I an O O O r 1 M Q. m A w 1 I I m n o m Qui F. M6225 ZIIQEE v5.6a

TIME IN SECONDS FI RST DOSE OF SILICON o 5 .t onH 7e n VA s m m a q o J A s 1 0 n 4 N o Owm 3 I 4/ r wa 4 WW I \fi J o D J E A? mm I T- /r f 7 ...I 6 5 4 3 2 hmtvg 5 klmlwb Z101 United States Patent Int. Cl. Cg 9/14 US. Cl. 208-131 2 Claims ABSTRACT OF THE DISCLOSURE The foaming occasioned by the conversion of residual petroleum stocks into coke by delayed coking processes is controlled by treating such stocks with a polydimethyl siloxane which has a centistoke viscosity of at least 150,000.

In the processing of various residual petroleum stocks into coke, a commonly used technique is the well-known delayed coking process. In the delayed coking process heavy residual oils are heated to above 500 C. by pumping them at high velocity through a pipe furnace and then changing these oils to an insulated coking drum. This process is further described in the Encyclopedia of Chemical Technology, 2nd edition, volume IV.

The delayed coking process produces quantities of foam which is undesirable since it diminishes the eflicient operation of the process. To control foam in the delayed coking process it is customary to treat the stocks while being processed with polydimethyl siloxane polymers.

The polydimethyl siloxane polymers most commonly used as defoamers in this application are of relatively low molecular weight as evidence by their centistoke viscosities. Typical polydimethyl siloxanes have centistoke viscosities of about 12,500. In a few cases polydimethyl siloxanes have been used which have centistoke viscosities of about 60,000.

The present invention is directed to provide improved defoaming methods for the treatment of petroleum stocks which are subjected to delayed coking processes.

In accordance with the invention it has been found that the foaming of residual petroleum stocks subjected to delayed coking processes may be inhibited by treating said stocks with from 0.05 up to about 100 ppm. of a polydimethyl siloxane which has a centistoke viscosity of at least 150,000. In a preferred embodiment of the invention it is preferred to use polydimethylsiloxanes which have centistoke viscosities ranging between 400,000 to 3,000,000, which are applied in a preferred dosage range of from 0.1 to 10 p.p.m.

To use these viscous polydimethyl siloxanes it is de- 3,700,587 Patented Oct. 24, 1972 ice sirable that they be first dispersed in petroleum hydrocarbon solvents such as kerosenes, naphthas, aromatic oils and the like. In some cases it is desirable to blend oil soluble surfactants with the polydimethyl siloxanes and the petroleum hydrocarbon liquid.

To illustrate the advantages and merits of the invention reference may be had to the drawings, e.g. FIGS. I, II and III, which show the relative merits of the polydimethyl siloxanes used in this invention over other lower molecular weight materials.

The data shown in the FIGS. I, I I and III were based upon the following test procedure:

TEST PROCEDURE l) A test tube is charged with grams of coker feedstock. This sample is heated to 850 F. and maintained at that temperature for the evaluation in order to simulate the conditions of a coking drum.

(2) For the evaluation, different viscosity silicones were diluted with deordorized kerosene. This evaluation was made on a straight weight basis.

(3) The diluted silicone is added one drop at a time.

(4) The foam height is recorded before and immediately after the silicone is added and every 10 seconds thereafter.

(5) When the foam height has reached /2 inch below the initial height, the next drop of antifoam is added. This procedure is continued until 3 drops have been added.

I claim:

1. A method of inhibiting foaming of residual petroleum stocks during their conversion into coke by a delayed coking process which comprises treating said residual petroleum stocks with from 0.05 up to about ppm. of a polydimethyl siloxane which has a centistoke viscosity of at least 150,000.

2. The method of claim 1 where the polydimethyl siloxane has a centistoke viscosity of from 400,000 to 3,000,000 and it is used as a dosage ranging from 0.1 to 10 ppm.

References Cited UNITED STATES PATENTS 2,702,793 2/ 1955 Smith 25278 3,235,502 2/1966 Waldmann 25249.6 3,383,327 5/1968 Sullivan 252358 JAMES E. POER, Primary Examiner A. P. DEMERS, Assistant Examiner US. Cl. X.R.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4082690 *Feb 7, 1977Apr 4, 1978Dow Corning CorporationAntifoam process for non-aqueous systems
US4176047 *Apr 10, 1978Nov 27, 1979Continental Oil CompanyRemoval of organic compounds from coker gasoline
US4257778 *Aug 28, 1979Mar 24, 1981Nihon Kogyo Kabushiki KaishaProcess for producing synthetic coking coal of high volatile matter content
US4329528 *Dec 1, 1980May 11, 1982General Electric CompanyMethod of defoaming crude hydrocarbon stocks with fluorosilicone compounds
US4396495 *Jan 25, 1982Aug 2, 1983Uop Inc.Reduction of foaming in a slurry catalyst hydrocarbon conversion process
US4557737 *Sep 28, 1984Dec 10, 1985The British Petroleum Company P.L.COil gas separation
US4596653 *Oct 17, 1984Jun 24, 1986The British Petroleum Company P.L.C.Demulsifying process
US4612109 *May 16, 1985Sep 16, 1986Nl Industries, Inc.Method for controlling foaming in delayed coking processes
US4645587 *Dec 7, 1984Feb 24, 1987Union Oil Company Of CaliforniaProcess for removing silicon compounds from hydrocarbon streams
US4711714 *Jun 21, 1985Dec 8, 1987The British Petroleum Company P.L.C.Method for the separation of gas from oil
US4961840 *Apr 13, 1989Oct 9, 1990Amoco CorporationAntifoam process for delayed coking
US4969988 *Apr 17, 1989Nov 13, 1990Petro-Canada Inc.Antifoam to achieve high conversion in hydroconversion of heavy oils
US5667669 *Mar 22, 1996Sep 16, 1997Betzdearborn Inc.Methods for inhibiting foam
US6083998 *Apr 24, 1998Jul 4, 2000Betzdearborn Inc.Defoamer and methods of use thereof
US6448298May 15, 2000Sep 10, 2002Betzdearborn, Inc.Defoamer and methods of use thereof
US9045699 *Jun 6, 2011Jun 2, 2015The University Of Wyoming Research CorporationHydrocarbonaceous material upgrading method
US20050042166 *Feb 3, 2004Feb 24, 2005Kindig James KellyMethod for the production of hydrogen-containing gaseous mixtures
US20110284425 *Nov 24, 2011The University Of Wyoming Research Corporation D/B/A Western Research InstituteHydrocarbonaceous Material Upgrading Method
CN103768831A *Oct 24, 2012May 7, 2014中国石油化工股份有限公司High temperature stable defoaming agent and application thereof in delay coking
CN103768831B *Oct 24, 2012May 13, 2015中国石油化工股份有限公司High temperature stable defoaming agent and application thereof in delay coking
EP0916377A2 *Nov 13, 1998May 19, 1999Dow Corning S.A.Foam control compositions
WO2005051512A1Nov 22, 2004Jun 9, 2005Baker Hugues IncorporatedSilicone defoamer to better control hydrocarbon foam and reduce silicon content of liquid hydrocarbon products
Classifications
U.S. Classification208/131, 516/144, 203/20, 201/9, 516/123
International ClassificationC10B55/00, B01D19/02, B01D19/04
Cooperative ClassificationB01D19/0409, C10B57/06, C10B55/00
European ClassificationC10B57/06, B01D19/04D2, C10B55/00