US3819917A - Means and method for controlling the hydrocarbon content of recycle acid in an alkylation unit - Google Patents

Means and method for controlling the hydrocarbon content of recycle acid in an alkylation unit Download PDF

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US3819917A
US3819917A US00281063A US28106372A US3819917A US 3819917 A US3819917 A US 3819917A US 00281063 A US00281063 A US 00281063A US 28106372 A US28106372 A US 28106372A US 3819917 A US3819917 A US 3819917A
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acid
signal
delta
hydrocarbon
level
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English (en)
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D Sweeney
W Hopkins
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Texaco Inc
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Texaco Inc
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Priority to US00281063A priority Critical patent/US3819917A/en
Priority to DE19732325803 priority patent/DE2325803C3/de
Priority to JP48067874A priority patent/JPS4956902A/ja
Priority to CA175,371A priority patent/CA1005083A/en
Priority to GB3295273A priority patent/GB1415067A/en
Priority to AU58418/73A priority patent/AU473958B2/en
Priority to FR7328025A priority patent/FR2196304B1/fr
Priority to BE134247A priority patent/BE803226A/fr
Priority to NL7310976A priority patent/NL7310976A/xx
Priority to IT27847/73A priority patent/IT998360B/it
Priority to BR6237/73A priority patent/BR7306237D0/pt
Priority to SE7311140A priority patent/SE396943B/xx
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Publication of US3819917A publication Critical patent/US3819917A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
    • C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
    • C07C2/56—Addition to acyclic hydrocarbons
    • C07C2/58—Catalytic processes
    • C07C2/62—Catalytic processes with acids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S208/00—Mineral oils: processes and products
    • Y10S208/01—Automatic control

Definitions

  • ABSTRACT A control system and method controls the hydrocarbon of recycle acid in an alkylation unit to maintain a predetermined hydrocarbon content.
  • the hydrocarbon content is controlled by controlling the interface level-between the acid phase and the hydrocarbon phase in an acid settler in accordance with sensed densities of fresh acid entering the alkylation unit, crude alkylate provided by the acid settler in the alkylation unit and the recycle acid.
  • a network substantially determines the actual hydrocarbon content of hydrocarbon enriched acid leaving the acid settler a portion of which is provided as the recycle acid, along with the fresh acid, to a contactor.
  • an isoparaffin and an olefin are contacted with the acid to provide an acid-hydrocarbon mix to the acid settler.
  • the settler provides the crude alkylate for further processing.
  • level control systems for acid settlers controlled the interface level in an acid settler to a predetermined value.
  • the composition of the olefin and isoparaffin feed changed or the temperature changed, the hydrocarbon content of recycle acid from the settler changed accordingly and differed from that normally provided by the predetermined interface level.
  • the present invention controls the interface level in the acid settler as a function of the hydrocarbon 'content of the hydrocarbon enriched acid leaving the settler. In doing so, the system senses the densities of the hydrocarbon enriched acid, the crude'alkylate and the fresh acid which are used to determine the hydrocarbon content of the hydrocarbon enriched acid.
  • a system controls the interface level between the acid phase and the hydrocarbon phase in an acid settler in an alkylation unit.
  • the settler receives an acidhydrocarbon mix from a contactor which has reacted an olefin and an isoparaffin in the presence of an acid catalyst.
  • the settler provides crude alkylate and hydrocarbon enriched acid a portion of which is recycled to the contactor.
  • a portion of the hydrocarbon enriched acid from the settler is discharged and replaced by fresh acid entering the alkylation unit.
  • the control system includes sensors sensing conditions of the fresh acid. the crude alkylate and the recycle acid.
  • a network provides a signalcorresponding to the hydrocarbon content of the recycle acid in accordance with the sensed conditions.
  • a control signal is developed in accordance with the hydrocarbon content signal and a signal correspondng to a predetermined hydrocarbon content. The control signal is applied to control means which control the interface level in the settler so as to controlthe hydrocarbon content of the recycle acid.
  • FIG. 1 there is shown a portion of an alkylation unit in which an olefin is reacted with an iso- 5 parafi'm in the presence of a catalyst, such as sulphuric or hydrofloric acid, and which is hereinafter referred to as acid, to fonn a higher molecular weight isoparaffin.
  • a catalyst such as sulphuric or hydrofloric acid
  • the acid in the following description shall be sulphuric acid.
  • the olefin may be butylenes, propylene, or a mixture of butylenes and propylene, while the isoparaffin may be isobutane.
  • the olefins and isoparaffin enter a contactor 4, by way of a line 6, where the olefin and isoparaffin are contacted with recycle acid entering byway of a line 7.
  • Contactor 4 provides an acid-hydrocarbon mix by way of a line 8 to an acid settler l2.
  • Settler l2 separates crude alkylate from the acid and the hydrocarbon product is provided through a line 14 while the acid is removed by way of a line 16.
  • the acid from settler 12 is an acid which is enriched with some hydrocarbon that has not been thoroughly separatedby the action of settler l2.
  • Acid settler 12 may be the only acid settler in the unit or it may be any acid settler in a group of acid settlers.
  • a hydrocarbon phase is separated from an acid phase by an interface level.
  • Fresh acid enters line 16 by way of a line 17 as needed to maintain a desired acid strength.
  • a pump 20 pumps the acid from line 16 into line 7.
  • a portion of the acid in line 7 is discharged by way of a line 21 leaving the recycle acid to be provided to contactor 4.
  • the discharged acid may be provided to another alkylation unit or disposed of.
  • the crude alkylate in line 14 can have its octane rating increased by increasing the amount of hydrocarbon in the acid leaving settler 12.
  • One variable is settler l2 interface level between the acid phase and the hydrocarbon phase.
  • Another variable is the temperature within settler 12.
  • the type and quantity of the olefins in line 6 will also affect the hydrocarbon content in the recycle acid in line 16.
  • control of the interface level in settler 12 at a constant value will not necessarily maintain the hydrocarbon content in the recycle acid in line I6 at a constant value. It is therefore desirable to control the interface level in acid settler 12 as a function of the hydrocarbon content of the recycle acid in line 16.
  • the hydrocarbon content of the recycle acid in line 16 can be related to the density of the recycle acid in line 16, the density of the acid portion of the recycle acid and the density of the hdyrocarbon portion of the recycle acid by the following equation 1.
  • fluid density is a function of temperature, it is necessary that all density values be adjusted to a common temperature base, such as 60 F, before determining existing recycle acid hydrocarbon content from equation 1.
  • the interface level in settler 12 is also affected by a valve 25 in line 21 cooperating with a flow rate sensor 26 and a flow recorder controller 27.
  • the set point of flow recorder controller 27 may be preset for a predetermined flow rate.
  • Sensor 26 provides a signal to controller 27 corresponding to the actual flow rate in line 21.
  • Flow rate recorder controller 27 then provides a signal to valve 25 to control the flow rate so that the flow rate in line 21 assumes the flow rate as indicated by the position of the set point of controller 27.
  • the discharge acid flow rate is maintained at a value so that the interface level may be controlled by controlling the fresh acid flow rate as hereinafter explained.
  • Density analyzers 30, 31 and 33 provide signals E E and E respectively, corresponding to the density of the recycle acid in line 7, to fresh acid in line 17 and the crude alkylate in line 14, respectively.
  • the fresh acid density is used as the density of the acid portion density D of the recycle acid
  • the crude alkylate density is used as the hydrocarbon portion density D
  • Density analyzers 30, 31, 33 may by way of example be devices manufactured by Automation Products Incorporated under the name Dynatrol Density-Specific Gravity Control Device. The devices are adjustable to control the range of operation.
  • analyzer 31 might include a range andspan of 1.5 to 2.0 specific gravity units at an operating temperature range of 45 to 70 F.
  • density analyzer 30 may have a specified range and span of I34 to 1.84 specific gravity units
  • density analyzer 33 may have a specified range and span of 0.5 to L specific gravity units.
  • a conventional type level sensor 40 provides a signal E corresponding to the interface level to a level recorder controller 41, which may be of a conventional type, and a set point signal means 45 which also receives signals E,, E and E Set point signal means 45 provides a control signal E to level recorder controller 41 to adjust its set point, accordingly.
  • Level recorder controller 41 controls the interface level in settler 12 as follows: When the interface level in settler 12 is greater than the level determined by the position of the set point in controller 41, controller 41 provides a signal to a valve 49 in line 17 reducing the flow rate of the fresh acid in line 17. Since the discharge acid flow rate is at a constant rate, the acid provided to contactor 4 is reduced and hence the acid to settler 12 is thereby reduced until such time as the interface level in settler 12 is substantially equal to the level determined by the position of the set point in controller 41.
  • controller 41 When the interface level in settler 12 is less than the level as determined by the position of the set point in controller 4], controller 41 provides a signal to valve 49 increasing the flow rate of the fresh acid in line 17 thereby increasing the acid entering contactor 4 and acid settler 12 which results in the interface level in settler 12 increasing until such time it is substantially equal to the level as determined by the position of the set point in controller 41.
  • set point signal means 45 is placed in operation by the closure of a conventional type on-off toggle switch 55.
  • switch 55 passes a direct current voltage V, from a source 56 of direct current voltages to clock means 58 thereby energizing clock means 58 causing it to provide sampling pulses E on a periodic basis.
  • Source 56 also provides direct current voltages V through V Sampling pulses E, are applied to sample and hold circuits 60, 60A and 60B causing them to sample and hold signals E through E respectively.
  • Elements having a suffix are connected and operate in a similar manner as elements having the same number without a suffix.
  • Subtracting means 63 subtracts the output from sample and hold circuit 60 from the output from sample and hold circuit 60A to provide a signal corresponding to the term (D,,-- D,,) in equation 1.
  • subtracting means 63A subtracts the output provided by sample and hold circuit 608 from the output provided from sample and hold circuit 60A to provide a signal corresponding to the term (D D
  • a divider 65 divides the signal from subtracting means 63 with the signal from subtracting means 63A to provide an output which is multiplied with voltage V by a multiplier 68. Voltage V corresponds to the term 100 in equation 1.
  • Multiplier 68 provides a signal E corresponding to the determined hydrocarbon content H,, of the recycle acid in line 16 and 7.
  • a required change AL in the interface level so that the hydrocarbon content of the recycle acid is substantially equal to a target hydrocarbon content is determined from equation 2:
  • Voltage V;,, corresponding to a target hydrocarbon content of the recycle a'cid H is subtracted from signal E,, by subtracting means to provide a signal corresponding to the term (H H in equation 2.
  • a multiplier 77 multiplies voltage V, with the signal from subtracting means 75 to provide a signal E corresponding to the term AL in equation,2.
  • the change in the interface level required to achieve the desired level may in itself have some limitations placed on it.
  • a limitation is placed on the amount which the settler level can be changed at one time.
  • voltage V which is positive, and voltage V which is negative correspond to the largest increase in settler level AL which will be permitted and to the largest decrease in settler level AL which will be permitted, respectively.
  • Comparator 80, 80A compare signal E with voltages V and V respectively.
  • comparators 80, 80A provide high level direct current outputs which cause an AND gate 81 to provide a high level direct current output to anelectronic switch 83.
  • Switch 83 is rendered conductive by the high level output from AND gate 8 and passes signal E from multiplier 77 as a change signal E
  • the high level outputs from comparators 80, 80A are inverted to low levels by inverters 85 and 85A, respectively, to render electronic switches 83A and 833, respectively, nonconductive. While non-conductive switches 83A, 83B block voltages V and V respectively.
  • comparator 80 provides a low level output which is inverted to a high level by an inverter 85 to render switch 83A conductive.
  • electronic switch 83A passes positive voltage V, as change signal E
  • Comparator 80A provides a high level output, which is inverted to a low level by inverter 85A thereby rendering switch 833 nonconductive to block voltage V,
  • AND gate 81 provides a low level output in response to the output from comparator 80 causing switch 83 to block signal E
  • the required change is a reduction in level equal to or greater than lower change limit AL the lower change limit is used as the change to the interface level.
  • comparators 80, 80A provide a high level output and a low level output, respectively.
  • lnverters 85 and 85A provide a low level output and a high level output, respectively, thereby rendering switch 83A non-conductive and switch 838 conductive, respectively.
  • Switch 838 when rendered conductive passes negative voltage V as signal E AND gate 81 provides a low level output in response to the output from-comparator 80A causing switch 83 to block signal E,,,.
  • the inverted output from comparator 80 causes switch 83A to block voltage V
  • a desired interface level is determined by algebraically summing change level signal E with the sensed interface level signal E, which is accomplished by summing means 90.
  • Summing means 90 provides a signal E corresponding to the desired interface level to comparators 93, 93A.
  • Comparators 93, 93A also receive voltages V, and V,,, respectively, corresponding to an upper limit L,- and a lower limit L,,, respectively, for the interface level in settler 12. Voltage V, is more positive than voltage V,,.
  • comparators 93, 93A provide high level direct current outputs to an AND gate 97 and to inverters 98, 98A. The high level outputs cause AND gate 97 to provide a high level direct current output to an electronic switch 100 rendering it conductive.
  • Switch 100 when rendered conductive passes signal E as a new set point signal E Inverters 98, 98A invert the high level outputs from comparators 93, 93A, respectively, to a low level rendering electronic switches 100A and 1008 non-conductive. When rendered non-conductive switches 100A and 100B block voltages V V,,, respectively.
  • comparator 93 and 93A provide a low level output and a high level output, respectively.
  • the output from comparator 93 causes AND gate 97 to provide a low level output to switch 100 rendering it non-conductive.
  • Switch 100 when non-conductive blocks signal E lnverter 98 inverts the low level output from comparator 93 to a high level to render switch 100A conductive thereby providing voltage V, as signal E
  • the high level output from comparator 93A is inverted to a low level by inverter 98A causing it to render switch B non-conductive to block voltage V,,.
  • comparators 93, 93A provide a high level output and a low level output, respectively.
  • AND gate 97 in response to the low level output from comparator 93A, provides a low level output to switch 100 rendering it non-conductive to block signal E
  • the high level output from comparator 93 is inverted to a low level to render switch 100A non-conductive thereby blocking voltage V
  • the low level output from comparator 93A is inverted to a high level by inverter 98A rendering switch 100B conductive to pass voltage V3 as Signal E14.
  • Signal E is applied to a sample and hold circuit 110.
  • Sample and hold circuit is controlled so that it will sample and hold signal E at a predetermined time after the sampling and holding of signals E,, E and E, by circuits 60, 60A and 608, respectively, to allow for the aforementioned computations to be made.
  • Clock means 58 provides a pulse E to a one-shot multivibrator 1 l2.
  • Multivibrator l 12 acts as a time delay, the time delay being the width of the pulse provided by multivibrator 112.
  • the trailing edge of the pulse from multivibrator 112 is triggered to another one-shot multivibrator 114.
  • Multivibrator 114 when triggered provides a sampling pulse to sample and hold circuit 110 causing it to sample and hold signal E
  • Sample and hold circuit 110 provides signal E to level recorder controller 41 to adjust the set point in controller 41.
  • interface level in settler 12 has been heretofore described by controlling the flow rate of the fresh acid. It would be obvious to one skilled in the art, that the interface level may also be controlled by controlling the flow rate of the discharge acid while maintaining a constant flow rate for the fresh acid.
  • a digital computer may be used in lieu of set point signal means 45. It is necessary that signals E, through E, be converted to digital signals, which may be done by a conventional type analog-to-digital converters.
  • the digital signals are applied to a general purpose digital computer, which may be of a conventional type.
  • the digital computer is programmed to solve equations 1, 2 and to carry out the selective functions with respect to the interface level change and the interface level, (i.e., AL, AL or AL and L, L or L
  • the digital output from the digital computer corresponding to the desired interface level is converted by a conventional digital-to-analog converter.
  • the digital-to-analog converter provides signal E to flow recorder controller 41 to control the interface level in acid settler 12 as heretofore explained.
  • the system of the present invention maintains the hydrocarbon content of recycle acid in an alkylation unit, by controlling the interface level between the acid phase and hydrocarbon phase in an acid settler in the alkylation unit.
  • the level in the settler is controlled as a function of the determined hydrocarbon content of the recycled acid.
  • the hydrocarbon content of the recycled acid is determined from the density of fresh acid entering the alkylation unit of the recycle acid and of crude alkylate provided by the settler.
  • a system for controlling an alkylation unit to maintain the hydrocarbon content of recycle acid in the alkylation unit and said alkylation unit includes a contactor wherein an olefin-isoparafi'm mixture is contacted with acid and the contactor provides an acidhydrocarbon mixture to an acid settler which separates a hydrocarbon phase from an acid phase to provide hydrocarbon enriched acid and provide crude alkylate, a portion of the hydrocarbon enriched acid is discharged while a portion of the hydrocarbon enriched acid is recycled back to the contactor as the recycle acid along with fresh acid entering the alkylation unit, comprising means for sensing conditions of the fresh acid, the crude alkylate and the recycle acid and providing a signal corresponding to the hydrocarbon content of the recycle acid'in accordance with the sensed conditions, means for providing a signal corresponding to a predetermined hydrocarbon content for the recycle acid, means connected to the sensing means and to the predetermined hydrocarbon content signalmeans for providing a control signal corresponding to a desired interface level between the acid phase and the hydro
  • the crude alkylate andthe recycle acid means for sensing an interface level between the acid phase and the hydrocarbon phase in the settler, means for providing a signal corresponding to a predetermined target hydrocarbon content for the recycle acid.
  • condition sensing means senses the densities of the fresh acid, the crude alkylate and the recycle acid and pro- H 10mm in/D4 D) where H is the hydrocarbon content of the recycle acid and D D and D are the densities of the fresh AL e( H]; HT)
  • e is a constant and H is the target hydrocarbon content; and means connected to the change signal means, to the level sensing means and to thecontrol means for summing the change signal and the sensed level signal to provide a signal corresponding to a desired interface level in the settler as the control signal.
  • a system as'described in claim 4 further comprising means for providing reference signals corresponding to upper AL and lower AL limits on the amount of change in the interface level in the settler and upper L and lower L limits on the interface level in the settler;
  • the change signal means further comprises first switching means connected to the summing means and receiving the change AL signal and the AL and AL reference signals for providing the AL signal as the change signal to the summing means when the change AL is less than the upper AL limit but greater than the lower AL limit, providing the AL reference signal as the change signal to the summing means when the change AL is not less than the upper AL limit, and providing the AL reference signal as the change signal to the summing means when the change AL is not greater than the lower AL limit; and the summing means further comprises second switching means connected to the control means and receiving the desired level signal from the summing means and the L and L reference signals from the reference signal means for providing the desired level signal to the control means at the con-- trol signal when the desired level is less than the upper level limit L and greater than the lower level
  • a method for controlling an alkylation unit to control the hydrocarbon content of recycle acid in the al kylation unit and said alkylation unit includes a contactor wherein an olefin-isoparaffin mixture is contacted with acid and the contactor provides an acidhydrocarbon mixture to an acid settler which separates a hydrocarbon phase and an acid phase to provide hydrocarbon enriched acid and crude alkylate, a portion of the hydrocarbon enriched acid is discharged while a portion of the hydrocarbon enriched acid is recycled back to the contactor as the recycle acid along with fresh acid entering the alkylation unit, which comprises the following steps of sensing conditions of the fresh acid, the crude alkylate and the recycle acid, sensing an interface level between the acid phase and the hydrocarbon phase in the acid settler, providing a signal corresponding to a predetermined hydrocarbon content for the recycle acid. controlling the interface level in the acid settler in accordance with a control signal, providing the control signal in accordance with the condition signals. the level signal and the target hydrocarbon contents signal for acid control the hydrocarbon con- H
  • H is the hydrocarbon content of the recycle acid and D D and D are the densities of the fresh acid, the recycle acid and the crude alkylate; providing a signal corresponding to a change AL in the interface level in the acid settler in accordance with the hydrocarbon content signal and the target signal and the following equation:
  • a method as described in claim 8 which further comprises the following steps, providing reference signals corresponding to upper AL and lower AL limits on the amount of interface level change and upper L and lower L limits on the interface level in the acid settler; and the change signal step further comprises providing the AL signal as the change signal when the change AL is less than the upper AL limit but greater than the lower AL limit, providing the AL reference signal as the change signal when the change AL is not less than the upper AL limit and providing the AL reference signal as the change signal when the change AL is not greater than the lower AL limit; and the summing step further comprises comparing the sum signal with the L and L reference signals, providing the sum signal as the control signal when the sum signal is less than the upper level limit L and greater than the lower level limit L providing the L reference signal as the control signal when the sum signal is not less than the upper level limit L and providing the L reference signal as the control signal when the sum signal is not greater than the lower level limit L

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Feedback Control In General (AREA)
US00281063A 1972-08-16 1972-08-16 Means and method for controlling the hydrocarbon content of recycle acid in an alkylation unit Expired - Lifetime US3819917A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US00281063A US3819917A (en) 1972-08-16 1972-08-16 Means and method for controlling the hydrocarbon content of recycle acid in an alkylation unit
DE19732325803 DE2325803C3 (de) 1972-08-16 1973-05-22 Anordnung zum Steuern des Kohlenwasserstoffgehaltes der Umlaufsäure bei der Alkylierung von Isoparaffinen mit Olefinen
JP48067874A JPS4956902A (fr) 1972-08-16 1973-06-18
CA175,371A CA1005083A (en) 1972-08-16 1973-06-29 Means and method for controlling the hydrocarbon content of recycle acid in an alkylation unit
GB3295273A GB1415067A (en) 1972-08-16 1973-07-11 Apparatus for and a method of controlling the hydrocarbon content of recycle acid in an alkylation unit
AU58418/73A AU473958B2 (en) 1972-08-16 1973-07-24 Means and method for controlling the hydrocarbon content of recycle acid inan alkylation unit
FR7328025A FR2196304B1 (fr) 1972-08-16 1973-07-31
BE134247A BE803226A (fr) 1972-08-16 1973-08-03 Dispositif et procede pour regler la teneur en hydrocarbures dans une unite d'alcoylation
NL7310976A NL7310976A (fr) 1972-08-16 1973-08-09
IT27847/73A IT998360B (it) 1972-08-16 1973-08-13 Apparecchio e procedimento per regolare il contenuto di idrocar buri in acidi di riciclo
BR6237/73A BR7306237D0 (pt) 1972-08-16 1973-08-14 Processo e dispositivo para controlar o teor de hidrocarboneto no acido de recido em uma unidade de alquilacao
SE7311140A SE396943B (sv) 1972-08-16 1973-08-15 Sett och anordning for att styra en alkyleringsenhet for reglering av retursyrans kolvetehalt, varvid densiteterna hos den ferska syran, det raa alkylatet och retursyran avkennes

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US00281063A US3819917A (en) 1972-08-16 1972-08-16 Means and method for controlling the hydrocarbon content of recycle acid in an alkylation unit

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US (1) US3819917A (fr)
JP (1) JPS4956902A (fr)
AU (1) AU473958B2 (fr)
BE (1) BE803226A (fr)
BR (1) BR7306237D0 (fr)
CA (1) CA1005083A (fr)
FR (1) FR2196304B1 (fr)
GB (1) GB1415067A (fr)
IT (1) IT998360B (fr)
NL (1) NL7310976A (fr)
SE (1) SE396943B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276257A (en) * 1979-04-05 1981-06-30 Phillips Petroleum Company Catalytic alkylation of hydrocarbons
US4664783A (en) * 1984-03-13 1987-05-12 Krupp-Koppers Gmbh Method for the separation of aromates from hydrocarbon mixtures containing aromatics
US4677244A (en) * 1985-11-29 1987-06-30 Phillips Petroleum Company Catalytic alkylation process and apparatus
US5707923A (en) * 1995-05-01 1998-01-13 Stratco, Inc. Method of and apparatus for controlling an alkylation process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293320A (en) * 1963-08-15 1966-12-20 Exxon Research Engineering Co Specific gravity analyzer and control in an alkylation process
US3625655A (en) * 1969-12-02 1971-12-07 Texaco Inc Acid analyzer
US3728527A (en) * 1972-02-24 1973-04-17 Texaco Inc Means and method for achieving an optimum acid strength for an alkylation unit
US3729624A (en) * 1971-08-05 1973-04-24 Texaco Inc Means and method for controlling the strength of acid in an alkylation unit
US3733473A (en) * 1971-08-05 1973-05-15 Texaco Inc Means and method for controlling the strength of acid in an alkylation unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293320A (en) * 1963-08-15 1966-12-20 Exxon Research Engineering Co Specific gravity analyzer and control in an alkylation process
US3625655A (en) * 1969-12-02 1971-12-07 Texaco Inc Acid analyzer
US3729624A (en) * 1971-08-05 1973-04-24 Texaco Inc Means and method for controlling the strength of acid in an alkylation unit
US3733473A (en) * 1971-08-05 1973-05-15 Texaco Inc Means and method for controlling the strength of acid in an alkylation unit
US3728527A (en) * 1972-02-24 1973-04-17 Texaco Inc Means and method for achieving an optimum acid strength for an alkylation unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276257A (en) * 1979-04-05 1981-06-30 Phillips Petroleum Company Catalytic alkylation of hydrocarbons
US4664783A (en) * 1984-03-13 1987-05-12 Krupp-Koppers Gmbh Method for the separation of aromates from hydrocarbon mixtures containing aromatics
US4677244A (en) * 1985-11-29 1987-06-30 Phillips Petroleum Company Catalytic alkylation process and apparatus
US5707923A (en) * 1995-05-01 1998-01-13 Stratco, Inc. Method of and apparatus for controlling an alkylation process

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AU5841873A (en) 1975-01-30
BR7306237D0 (pt) 1974-07-11
FR2196304A1 (fr) 1974-03-15
SE396943B (sv) 1977-10-10
DE2325803B2 (de) 1976-01-22
BE803226A (fr) 1974-02-04
JPS4956902A (fr) 1974-06-03
GB1415067A (en) 1975-11-26
DE2325803A1 (de) 1974-03-07
IT998360B (it) 1976-01-20
FR2196304B1 (fr) 1978-01-27
CA1005083A (en) 1977-02-08
AU473958B2 (en) 1976-07-08
NL7310976A (fr) 1974-02-19

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