N,N-Dimethylaniline → HCID 68131471, compound

HRID 1576366Notes

Reaction equation

HRID 1576366 reaction equation
[CH3:1][N:2]([CH3:9])[C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[S:10](=[O:13])([OH:12])[OH:11].S([O-])([O-])(=O)=O.[NH4+].[NH4+]>>[S:10]([OH:13])([OH:12])=[O:11].[CH3:1][N:2]([CH3:9])[C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

4

Reactant 3

HCID 949N,N-Dimethylaniline2×HCID 1100Sulfurous Acid2×HCID 6097028Ammonium Sulfate

Product 1

HCID 68131471HCID 68131471, compound

Procedure

The SO2 -lean and dimethyl aniline-enriched effluent gas from absorber section 5 of tower 6 which contains about 0.15% by volume SO2 and about 800-900 p.p.m. of gaseous dimethyl aniline, passes upwardly through sulfurous acid scrubbing section 9. A tail gas containing 0.05% by volume SO2 and substantially-free of gaseous dimethyl aniline is withdrawn from sulfurous acid scrubbing section 9 through line 15. Substantially pure SO2 gas bled off the upper SO2 gas-containing space in liquefied SO2 surge tank 69 and aqueous ammonium sulfate solution withdrawn from the lower portion of regenerator section 30 of tower 28 are separately supplied into scrubbing section 9 through lines 16 and 17 respectively. The SO2 gas is supplied into the lower portion of scrubber section 9 below the lowermost tray therein through line 16 at a flow rate of 30 SCFM (dry) and at a temperature of 80°F. The liquid aqueous ammonium sulfate solution is pumped into the upper portion of scrubbing section 9 above the uppermost tray therein through line 20 at a temperature of 78°F. and a flow rate of 30 g.p.m. and at flow rates of ammonium sulfate and water contained therein of about 14 lbs/minute and about 250 lbs/minute respectively. The uprising SO2 gas in scrubbing section 9 is dissolved in and reacts with the water of the downwardly flowing aqueous ammonium sulfate to form in scrubbing section 9 a dilute sulfurous acid-and ammonium sulfate-containing aqueous solution. Substantially all of the gaseous dimethyl aniline present in the gas is removed from the gas in scrubbing section 9 by reaction with the sulfurous acid in the presence of the ammonium sulfate to form dimethyl aniline sulfite. The aqueous sulfurous acid-and ammonium sulfate-containing scrubbing solution also containing the thus-formed dimethyl aniline sulfite is withdrawn from the lowermost tray in scrubber section 9 through line 19 at a temperature of 80°F. and passed at a flow rate of 34.5 g.p.m. and at flow rates of SO2, SO4 and dimethyl aniline contained therein of 6.8 lbs/minute, 11.0 lbs/minute and 10.5 lbs/minute respectively to collection tank 20.

Workup

  1. additionA tail gas containing 0.05% by volume SO2
  2. customsubstantially-free of gaseous dimethyl aniline is withdrawn from sulfurous acid scrubbing section 9 through line 15
  3. customwithdrawn from the lower portion of regenerator section 30 of tower 28
  4. dry with materialthrough line 16 at a flow rate of 30 SCFM (dry)
  5. customat a temperature of 80°F
  6. customat a temperature of 78°F.
  7. dissolutionThe uprising SO2 gas in scrubbing section 9 is dissolved in and
  8. customreacts with the water of the downwardly flowing aqueous ammonium sulfate
  9. customto form
  10. additioncontaining aqueous solution
  11. customSubstantially all of the gaseous dimethyl aniline present in the gas is removed from the gas in scrubbing section 9 by reaction with the sulfurous acid in the presence of the ammonium sulfate

Sources & evidence

ORD record
ord-a9d93aa8d1724ccd85434972ee6f0c2c
Source dataset
uspto-grants-1976_09
Patent number
US03980759

Reaction notes

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