GB1281631A - Improved phthalic anhydride process control method - Google Patents

Improved phthalic anhydride process control method

Info

Publication number
GB1281631A
GB1281631A GB5201/70A GB520170A GB1281631A GB 1281631 A GB1281631 A GB 1281631A GB 5201/70 A GB5201/70 A GB 5201/70A GB 520170 A GB520170 A GB 520170A GB 1281631 A GB1281631 A GB 1281631A
Authority
GB
United Kingdom
Prior art keywords
phthalic anhydride
temperature
product stream
heat exchange
exchange fluid
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
Application number
GB5201/70A
Inventor
Mack F Hughes
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.)
Chevron USA Inc
Original Assignee
Chevron Research and Technology Co
Chevron Research 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 Chevron Research and Technology Co, Chevron Research Co filed Critical Chevron Research and Technology Co
Publication of GB1281631A publication Critical patent/GB1281631A/en
Expired legal-status Critical Current

Links

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
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/001—Controlling catalytic processes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
    • C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/584—Recycling of catalysts

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Furan Compounds (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)

Abstract

1281631 Phthalic anhydride CHEVRON RESEARCH CO 3 Feb 1970 [3 Feb 1969 13 Nov 1969] 5201/70 Heading C2C In a process for the production of phthalic anhydride from an aromatic hydrocarbon feed and an oxygen-containing gas in a vapour phase oxidation reactor utilizing a metal oxide oxidation catalyst in a fixed bed having a hotspot zone and an indirect heat exchanger with associated circulating heat exchange fluid as the temperature control means, there is fed to a control system capable of receiving, storing and comparing information relating to parameters affecting the process conditions in the reactor, information relating to (a) the composition of the vaporized effluent product stream issuing from the reactor, and (b) the temperature of the heat exchange fluid; and responsive to a comparison of the stored information the control system causes the required circulation of the heat exchange fluid to be effected, the mode of operation being such that initially the temperature of the heat exchange fluid is adjusted to and maintained at a value in the range from 20‹ to 50‹ F. below the optimum temperature until the composition of the effluent product stream becomes stabilized, and thereafter the temperature of the heat exchange fluid is increased stepwise by from 5‹ to 15‹ F. until the stabilized product stream contains less than 0À5 weight per cent of tolualdehyde-type compounds based on the weight of phthalic anhydride in the product stream, less than 2 parts but greater than zero part of phthalide and/or quinone-type compounds and less than 1 part of unoxidized hydrocarbon feed per 100 parts of phthalic anhydride, thereafter maintaining the thus established operating temperature so long as the product stream composition falls within the aforeprescribed ranges, otherwise resuming the upward incremental adjustment of the heat exchanger fluid as before, said information relating to the product stream composition being determined by means of a vapour phase chromatograph unit. Information on the location of the hot-spot zone may also be fed into the control system. When the hot-spot is within the 60-80 percentile portion of the bed or the phthalide content is not decreased below 2% based on the phthalic anhydride (whichever occurs first), the catalyst may be regenerated by discontinuing the flow of the hydrocarbon feed into the reactor while continuing the flow of oxygen-containing gas for a period in the range of from “ to 1 hour, during which time the bed is maintained at a temperature in the range of from 650‹ to 1000‹ F. The control system may be a digital or analogue device.
GB5201/70A 1969-02-03 1970-02-03 Improved phthalic anhydride process control method Expired GB1281631A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US79623569A 1969-02-03 1969-02-03
US87643169A 1969-11-13 1969-11-13

Publications (1)

Publication Number Publication Date
GB1281631A true GB1281631A (en) 1972-07-12

Family

ID=27121712

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5201/70A Expired GB1281631A (en) 1969-02-03 1970-02-03 Improved phthalic anhydride process control method

Country Status (2)

Country Link
FR (1) FR2033280A1 (en)
GB (1) GB1281631A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105339337A (en) * 2013-06-26 2016-02-17 巴斯夫欧洲公司 Process for preparing phthalic anhydride

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105339337A (en) * 2013-06-26 2016-02-17 巴斯夫欧洲公司 Process for preparing phthalic anhydride
EP3013783A4 (en) * 2013-06-26 2017-03-15 Basf Se Process for preparing phthalic anhydride
US9765046B2 (en) 2013-06-26 2017-09-19 Basf Se Process for preparing phthalic anhydride
EP3013783B1 (en) 2013-06-26 2018-10-17 Basf Se Process for preparing phthalic anhydride

Also Published As

Publication number Publication date
DE2004435A1 (en) 1970-09-03
DE2004435B2 (en) 1976-04-08
FR2033280A1 (en) 1970-12-04

Similar Documents

Publication Publication Date Title
US3450788A (en) Dehydrogenation process
Hermes et al. Variation of transition-state structure as a function of the nucleotide in reactions catalyzed by dehydrogenases. 2. Formate dehydrogenase
US3850840A (en) Water gas shift process
GB1373230A (en) Process for producing terephthalic acid
GB1454236A (en) Process for continuous preparation of terephthalic acid
US3850841A (en) Shift process for new catalyst
GB1420662A (en) Process for the splitting by oxidation of unsaturated hydro carbons
GB1351242A (en) Preparing vicinal glycol esters
GB1281631A (en) Improved phthalic anhydride process control method
ES233937A1 (en) Control of catalytic processes
GB1449092A (en) Apparatus for partially oxidising organic compounds
GB1398530A (en) Production of carboxylic acids and anhydrides
GB1353482A (en) Catalytic oxidation process for producing trimellitic acid
GB1238224A (en)
US2691660A (en) Preparation of maleic anhydride
US3925463A (en) Process for the production of methyl acrylate
US2117359A (en) Phthalic anhydride production
US3117990A (en) Process of producing vinyl compounds
US4211881A (en) Preparation of phthalic acid by single step continuous air oxidation of liquid ortho-xylene
GB1384432A (en) Method of preparing maleic anhydride
GB955421A (en) Improvements in and relating to the oxidation of aldehydes
GB1429471A (en) Process for the production of phthalic acids
EP0361798A2 (en) Oxidation of polyalkylaromatics
FR2034019A5 (en) Cooling fluidised-bed catalytic reactors
US2801260A (en) Process for partial oxidation of hydrocarbons

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee