US2365543A - Method for preventing reboiler scaling - Google Patents

Method for preventing reboiler scaling Download PDF

Info

Publication number
US2365543A
US2365543A US465700A US46570042A US2365543A US 2365543 A US2365543 A US 2365543A US 465700 A US465700 A US 465700A US 46570042 A US46570042 A US 46570042A US 2365543 A US2365543 A US 2365543A
Authority
US
United States
Prior art keywords
reboiler
aluminum chloride
scaling
preventing
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US465700A
Inventor
Clarence G Gerhold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universal Oil Products Co
Original Assignee
Universal Oil Products Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universal Oil Products Co filed Critical Universal Oil Products Co
Priority to US465700A priority Critical patent/US2365543A/en
Application granted granted Critical
Publication of US2365543A publication Critical patent/US2365543A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/06—Halogens; Compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/06—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by pressure distillation
    • 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
    • Y10S585/00—Chemistry of hydrocarbon compounds
    • Y10S585/949—Miscellaneous considerations
    • Y10S585/95—Prevention or removal of corrosion or solid deposits

Definitions

  • This invention relates to a method for preventing reboiler scaling and more particularly to a method of operating reboilers which are employed for heating relatively narrow low boiling range hydrocarbons containing dissolved solids.
  • the features of my invention make it particularly applicable to isomerization plants in which low boiling hydrocarbons containing dissolved aluminum chloride are heated in reboilers. Difficulty has been experienced in these installations due to the deposition of small quantities of aluminum chloride on the reboiler tubes. This is due to localized total vaporization of the liquid surrounding the tubes because it is necessary that the tube surfaces in order to supply sufiicient heat for the process be at temperatures higher than the boiling points of the various components of the liquid. This local vaporization will, of course, cause a deposit of dissolved solids when the liquid evaporates.
  • numeral I denotes a fractionating column which may be any of the conventiona1 types provided with packing or bubble trays and connected to a suitable reboiler 2 by means of conduits 3 and 4 respectively.
  • Reboiler 2 may be any suitable reboiler in which the heating medium such as steam or hot oil is passed in indirect contact and heat exchange relation with liquid from the bottom of fractionating column I.
  • the particular reboiler illustrated is provided with a plurality of tubular members 5 through which the heating medium introduced through line 6 and removed through line 1 is passed but any other type of heat exchange equipment may be employed, for instance, the heating medium may surround the tubes and the liquid to be heated pass therethrough.
  • the bottoms product withdrawn through line 8 from the fractionating column which in the case wherein this column is used in an isomerization unit for the conversion of normal butane and isobutane, comprises substantially all materials containing four carbon atoms. This material,
  • the overhead fraction from the column is withdrawn through line 9 and cooled in condenser ID by means of a cooling medium supplied thereto by means of lines II and I2.
  • the cooled and condensed material is conducted by means of line l3 to receiver 14.
  • the uncondensed gases are separated from the condensate and removed from the system through valve I5 and line IS.
  • the condensate is withdrawn from the receiver by means of line I! and pump [8 and all or a portion thereof, returned to the top of the column by means of valve l9 and line 20 to act as reflux. A portion of this condensate may be removed from the system by means of valve 2
  • a higher boiling material which is substantially inert with respect to the aluminum chloride, at the conditions of operation is introduced through line 24 and directed either into the feed to the column by means of line 25 and valve 26 or it may be directed into the feed to the reboiler by means of line 21 and valve 28.
  • fractionating column I is the hydrogen chloride column of an isomerization plant
  • the feed through line 23 will contain a substantial portion of C4 hydrocarbons together with lighter hydrocarbons and hydrogen chloride plus a small portion of dissolved aluminum chloride.
  • the aluminum chloride will normally remain dissolved at the temperature and pressure conditions of the column, but when this solution comes in contact with tubes 5 in reboiler 2 due to the temperature of the tubes and the relatively narrowlow boiling range of the hydrocarbon material, this aluminum chloride would be deposited out as the hydrocarbon vaporizes.
  • a method of preventing scaling on tubes in reboilers during the heating of volatile hydrocarhon liquids containing dissolved aluminum chloride which comprises introducing intosaid reboiler a higher boiling hydrocarbon liquid which will retain said aluminum chloride in solution and which is inert with respect thereto, and maintaining the last-named liquid at a temperature below the vaporizing point of aluminum chloride.
  • a method of preventing scaling on tubeslin reboilers during the heating of low. boilinghydrocarbons containing dissolved aluminum chloride which comprises introducing into said ,reb oiler a boiled a higher boiling hydrocarbon liquid which is relatively inert with respect to and is adapted to retain said aluminum chloride in solution during the reboiling, and maintaining the last-named liquid at a temperature below the vaporizing .pointof aluminum chloride.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Description

4-, c. G. GERHOLD 2,365, 3
METHOD FOR PREVENTING REBOILER SCALING Filed Nov. 16. 1942 zzcezlrx r I Patented Dec. 19, 1944..
METHOD FOR PREVENTING REBOILER SCALING Clarence G. Gerhold, Chicago, Ill assignor to Universal Oil Products Company, Ch cago, 111., a corporation of Delaware Application November 16, 1942, Serial No. 465,700
3 Claims.
This invention relates to a method for preventing reboiler scaling and more particularly to a method of operating reboilers which are employed for heating relatively narrow low boiling range hydrocarbons containing dissolved solids.
The features of my invention make it particularly applicable to isomerization plants in which low boiling hydrocarbons containing dissolved aluminum chloride are heated in reboilers. Difficulty has been experienced in these installations due to the deposition of small quantities of aluminum chloride on the reboiler tubes. This is due to localized total vaporization of the liquid surrounding the tubes because it is necessary that the tube surfaces in order to supply sufiicient heat for the process be at temperatures higher than the boiling points of the various components of the liquid. This local vaporization will, of course, cause a deposit of dissolved solids when the liquid evaporates.
In a short time, the deposition of solids on the reboiler tubes will affect the heat transfer coefficient and consequntly the efficiency of the system. Aluminum chloride besides decreasing the heat efliciency of the reboiler also has a corrosive effect on many materials especially if any 'water is present.
By employing my invention, the above mentioned difficulties due to the deposition of aluminum chloride on the reboiler tubes can be eliminated because according to my invention I introduce a higher boiling hydrocarbon, which is substantially inert with respect to the aluminum chloride at the conditions of operation, into the reboiler to retain the aluminum chloride always in solution even in the space adjacent the reboiler tubes.
In order to make the features and advantages of my invention more apparent, reference is made to the accompanying diagrammatic drawing showing one operation to which it may be advantageously applied.
In the drawing, numeral I denotes a fractionating column which may be any of the conventiona1 types provided with packing or bubble trays and connected to a suitable reboiler 2 by means of conduits 3 and 4 respectively. Reboiler 2 may be any suitable reboiler in which the heating medium such as steam or hot oil is passed in indirect contact and heat exchange relation with liquid from the bottom of fractionating column I. The particular reboiler illustrated is provided with a plurality of tubular members 5 through which the heating medium introduced through line 6 and removed through line 1 is passed but any other type of heat exchange equipment may be employed, for instance, the heating medium may surround the tubes and the liquid to be heated pass therethrough.
The bottoms product withdrawn through line 8 from the fractionating column, which in the case wherein this column is used in an isomerization unit for the conversion of normal butane and isobutane, comprises substantially all materials containing four carbon atoms. This material,
therefore, will have a relatively narrow boiling range which at atmospheric pressure is in the range of about 9 to 32 F.
The overhead fraction from the column is withdrawn through line 9 and cooled in condenser ID by means of a cooling medium supplied thereto by means of lines II and I2. The cooled and condensed material is conducted by means of line l3 to receiver 14. In receiver H, the uncondensed gases are separated from the condensate and removed from the system through valve I5 and line IS. The condensate is withdrawn from the receiver by means of line I! and pump [8 and all or a portion thereof, returned to the top of the column by means of valve l9 and line 20 to act as reflux. A portion of this condensate may be removed from the system by means of valve 2| and line 22. Feed to the column is supplied by means of line 23.
In order to retain the dissolved solids always in solution, a higher boiling material which is substantially inert with respect to the aluminum chloride, at the conditions of operation is introduced through line 24 and directed either into the feed to the column by means of line 25 and valve 26 or it may be directed into the feed to the reboiler by means of line 21 and valve 28.
When, for example, fractionating column I is the hydrogen chloride column of an isomerization plant, the feed through line 23 will contain a substantial portion of C4 hydrocarbons together with lighter hydrocarbons and hydrogen chloride plus a small portion of dissolved aluminum chloride. The aluminum chloride will normally remain dissolved at the temperature and pressure conditions of the column, but when this solution comes in contact with tubes 5 in reboiler 2 due to the temperature of the tubes and the relatively narrowlow boiling range of the hydrocarbon material, this aluminum chloride would be deposited out as the hydrocarbon vaporizes. When employing my invention, however, that is, introducing a heavier hydrocarbon material such as alkylate or alkylate bottoms from an alkylation plant, the aluminum chloride will always be maintained in solution and the difliculties due to scaling on the reboiler tubes will be eliminated.
I claim as my invention:
1. A method of preventing scaling on tubes in reboilers during the heating of volatile hydrocarhon liquids containing dissolved aluminum chloride which comprises introducing intosaid reboiler a higher boiling hydrocarbon liquid which will retain said aluminum chloride in solution and which is inert with respect thereto, and maintaining the last-named liquid at a temperature below the vaporizing point of aluminum chloride.
2. A method of preventing scaling on tubeslin reboilers during the heating of low. boilinghydrocarbons containing dissolved aluminum chloride, which comprises introducing into said ,reb oiler a boiled a higher boiling hydrocarbon liquid which is relatively inert with respect to and is adapted to retain said aluminum chloride in solution during the reboiling, and maintaining the last-named liquid at a temperature below the vaporizing .pointof aluminum chloride.
I CLARENCE G. GERHOID.
US465700A 1942-11-16 1942-11-16 Method for preventing reboiler scaling Expired - Lifetime US2365543A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US465700A US2365543A (en) 1942-11-16 1942-11-16 Method for preventing reboiler scaling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US465700A US2365543A (en) 1942-11-16 1942-11-16 Method for preventing reboiler scaling

Publications (1)

Publication Number Publication Date
US2365543A true US2365543A (en) 1944-12-19

Family

ID=23848822

Family Applications (1)

Application Number Title Priority Date Filing Date
US465700A Expired - Lifetime US2365543A (en) 1942-11-16 1942-11-16 Method for preventing reboiler scaling

Country Status (1)

Country Link
US (1) US2365543A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430979A (en) * 1944-12-29 1947-11-18 Standard Oil Dev Co Catalytic isomerization of paraffinic hydrocarbons
US2766190A (en) * 1949-05-14 1956-10-09 Ruetgerswerke Ag Continuous distillation of lignite and coal tars

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430979A (en) * 1944-12-29 1947-11-18 Standard Oil Dev Co Catalytic isomerization of paraffinic hydrocarbons
US2766190A (en) * 1949-05-14 1956-10-09 Ruetgerswerke Ag Continuous distillation of lignite and coal tars

Similar Documents

Publication Publication Date Title
EP0080808B1 (en) Distillation apparatus
US4428201A (en) Power generation with fractionator overhead vapor stream
US3763022A (en) Condensing fractionator sidestream vapor as reboiler heat source
US2377736A (en) Fractionation of hydrocarbons
US3425935A (en) Distillation in the presence of water
US20120298560A1 (en) Process for providing one or more streams
US3109782A (en) Vapor compression distillation process
US2365543A (en) Method for preventing reboiler scaling
US2426110A (en) Distillation of crude petroleum
US2218495A (en) Production of ethylene, etc.
US2064757A (en) Process for the treatment of hydrocarbon oil
US2582920A (en) High purity dicyclopentadiene
US2175590A (en) Method of fractionation
US2831904A (en) Depolymerization of dicyclopentadiene
US2310837A (en) Petroleum distillation
US2343870A (en) Manufacture of alkylated benzene hydrocarbons
US2355589A (en) Method of recovery of light hydrocarbons
US1701988A (en) Art of separating liquids having different boiling points
US2374984A (en) Process for separation of vapors
US4428202A (en) Electrical power generation by fractionation column reboiler
CN111225726A (en) Method and apparatus for desorbent recovery
US2432405A (en) Separation of hydrogen fluoride from hydrocarbons by distillation and partial condensation
US4428203A (en) Power generation using fractionation column reboiler systems
US2378728A (en) Isomerization of hydrocarbons
US3367846A (en) Utilization of recovered steam heat for heating the distillation zone