Dispersant material for mitigating crude oil fouling of process equipment and method for using same

a technology of dispersant material and process equipment, which is applied in the direction of liquid carbonaceous fuels, fuel additives, fuels, etc., can solve the problems of increasing pressure drop characteristics, reducing heat transfer efficiency, and affecting so as to inhibit and/or mitigate the fouling of process equipment, improve the quality of pibsa-pam materials, and facilitate the incorporation

Inactive Publication Date: 2005-11-24
TPC GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] A principal object of the invention is to provide an improved dispersant material for inhibiting and/or mitigating crude oil fouling of process equipment. In particular it is an object of the invention to provide an improved dispersant having a chemical makeup which facilitates the incorporation therein of an increased number of polar sites capable of chelating with undesirable carbonaceous materials

Problems solved by technology

However, when crude oils, and particularly those that are deficient in aromatics and/or resins, are subjected to the high temperatures needed for processing, the asphaltenes and other undesirable carbonaceous materials become incompatible with the liquid phase and tend to flocculate and/or precipitate so as to deposit and accumulate on hot metal internal surfaces of processing equipment.
This accumulation of undesirable carbonaceous materials on the internal surfaces of process equipment is often referred to as “fouling.” And fouling often causes serious operational problems such as reduced heat transfer efficiency and increased pressure drop characteristics.
In fact, in some cases fouling is of sufficient magnitude to totally block flow through the equipment.
Moreover, fouling often may be the cause of increased

Method used

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  • Dispersant material for mitigating crude oil fouling of process equipment and method for using same
  • Dispersant material for mitigating crude oil fouling of process equipment and method for using same
  • Dispersant material for mitigating crude oil fouling of process equipment and method for using same

Examples

Experimental program
Comparison scheme
Effect test

example i

[0030] A preferred embodiment of an improved, high quality PIBSA-PAM material produced from a clean, high quality PIBSA made using a PIB having a significant concentration of vinylidene double bonds is prepared in the following manner: [0031] 1. 433 g of an HR-PIB product having an MN of 950 and an alpha vinylidene content of 83.6% is charged into glass reactor and the reactor is heated to 300° F. for 1 hour while a vacuum and N2 sweep are applied thereto. [0032] 2. 67.04 g of Maleic Anhydride at 300° F. is added to the HR-PIB in the reactor and the reaction mixture is heated to 450° F. [0033] 3. The reaction mixture is maintained at a reaction temperature of 450° F. for 4.5 hours and thereafter a vacuum and N2 sweep are applied to the reactor for 1 hour to strip away any unreacted Maleic Anhydride. [0034] 4. The product is a Polyisobutylene Succinic Anhydride (PIBSA). [0035] 5. 309.3 g of the PIBSA thus prepared is transferred to another glass reactor and heated to 250° F. [0036] 6...

example ii

Thermal Fouling Testing of Untreated Crude Oil

[0044] The thermal fouling characteristics of untreated crude oil is determined using the TFTM described above. The thermal fouling test results show that the crude oil used in connection with these tests is a relatively high fouling crude oil. Test conditions and test fouling results are presented below.

Exchanger heater metal temperature700° F.Liquid outlet temperature510° F.Unit operating pressure800 psigExchanger heater metal typeC / S 1018Oil flow3.0 cc / minTest time180 minutesMeasured fouling 70° F.

example iii

Thermal Fouling Testing of Crude Oil Containing Conventional PIBSA-PAM Antifouling Agent

[0045] A crude oil identical to the crude oil tested in Example I was blended with 100 ppm (wt) of the acquired PIBSA-PAM that was made with conventional PIB. This conventional commercially available PIBSA-PAM had the following characteristics:

Average molecular weight (MN)1300Carbon content82.87 wt %Hydrogen content12.89 wt %Oxygen content 0.90 wt %Nitrogen content 4.8 wt %Carbon / Hydrogen atomic ratio  0.53Total base number114 mg / gm

[0046] The TFTM was used to determine the thermal fouling of the treated crude oil using exactly the same operating conditions as used in Example II. Test results show that the crude oil treated with conventional PIBSA-PAM has reduced fouling characteristics as compared with the untreated crude oil. Test operating conditions and results are presented below.

Exchanger heater metal temperature700° F.Liquid outlet temperature514° F.Unit operating pressure800 psigExcha...

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Abstract

An improved dispersant material for mitigating crude oil fouling comprises a reaction product of a polyamine and a polyisobutylene succinyl anhydride made with a polyisobutylene having a vinylidene double bond content of at least 50%. The reaction product has an active nitrogen atom content of at least about 2% by weight. The reaction product is prepared by thermally reacting the polyisobutylene with maleic anhydride to produce said polyisobutylene succinyl anhydride and thereafter reacting the polyisobutylene succinyl anhydride with a polyamine having 5 to 7 active nitrogen atoms.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] None BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to dispersant materials useful for mitigating and / or inhibiting fouling of equipment used for handling and / or treating liquid hydrocarbons such as crude oil and the like, and particularly to improved antifoulant materials based on a reaction product of a hydrocarbon long chain such as polyisobutylene (PIB), a bridging agent such as maleic anhydride and a substance having a polar group such as a polyamine (PAM). Such products are sometimes referred to generically as PIBSA-PAMs. The invention also relates to methodology useful for mitigating the fouling tendencies of crude oils and the like which includes the addition of an improved fouling mitigating and / or inhibiting dispersant material thereto. Furthermore, the invention relates to improved crude oil compositions wherein fouling tendencies have been mitigated by the presence therein o...

Claims

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Application Information

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IPC IPC(8): C08F8/32C08F10/00
CPCC08F8/32C10L1/221C10L1/2383C10L10/00C08F10/10C10L10/04C10L10/06
Inventor DICKAKIAN, GHAZI B.BAXTER, C. EDWARD JR.TRUONG, JEFFREY QUOC
Owner TPC GROUP
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