Benzene → Phthalic Anhydride

HRID 444117Notes

Reaction equation

HRID 444117 reaction equation
[C:1]1(=[O:7])[O:6][C:4](=[O:5])[CH:3]=[CH:2]1.[CH:8]1[CH:13]=CC=[CH:10][CH:9]=1>CC1C=CC=CC=1C>[C:4]1(=[O:5])[O:6][C:1](=[O:7])[C:2]2=[CH:13][CH:8]=[CH:9][CH:10]=[C:3]12

Participants

4

Reactant 2

HCID 241BenzeneHCID 7923Maleic Anhydride3×

Product 1

HCID 6811Phthalic Anhydride

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

These objectives are realized in the present invention by employing compressed air as a propellant for the jet pumps maintaining the vacuum as hereinbefore described and by introducing this air, charged with sucked organic-containing vapors, into the gas scrubbing zone. The entire quantity of organic-containing vapors and gases withdrawn from the maleic anhydride processing stages is sucked into the vacuum lines by the jet pumps, after which a large portion of such vapors, primarily water vapor, is condensed in a surface condenser(s). The propellant air, which is admixed with the remaining sucked gases and vapors recovered from the maleic anhydride processing stages, is introduced into the gas scrubbing solution, along with those reaction gases which are being treated and which contain residual maleic anhydride. Such reaction gases can be formed, for example, in the production of maleic anhydride from benzene or C-4 hydrocarbons, preferably after partial condensation of the maleic anhydride from the gas. Such reaction gases can also be formed in the production of phthalic anhydride from o-xylene after separation of the phthalic anhydride therefrom.

Workup

  1. temperaturemaintaining the vacuum
  2. additionby introducing this air
  3. additioncharged
  4. additionwith sucked organic-containing vapors
  5. customThe entire quantity of organic-containing vapors and gases withdrawn from the maleic anhydride processing stages
  6. customcondensed in a surface condenser(s)
  7. customrecovered from the maleic anhydride processing stages
  8. additionis introduced into the gas
  9. customalong with those reaction gases which
  10. additionare being treated
  11. customSuch reaction gases
  12. customSuch reaction gases

Sources & evidence

ORD record
ord-6a8c3d254b774537830999408f3548b6
Source dataset
uspto-grants-1981_04
Patent number
US04263211

Reaction notes

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