Formaldehyde → Morwet D 425

HRID 572708Notes

Reaction equation

HRID 572708 reaction equation
[CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1.[S:11](=O)(=[O:14])([OH:13])[OH:12].[CH2:16]=[O:17].[OH-].[Ca+2].[OH-]>O>[C:9]1([S:11]([OH:14])(=[O:13])=[O:12])[C:10]2[C:5](=[CH:4][CH:3]=[CH:2][CH:1]=2)[CH:6]=[CH:7][CH:8]=1.[CH2:16]=[O:17]

Participants

6

Reactant 4

HCID 712Formaldehyde2×HCID 931NaphthaleneHCID 1118Sulfuric AcidHCID 6093208Calcium Hydroxide

Product 1

HCID 57351120Morwet D 425

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

1 mol of naphthalene (128.2 g) was reacted with 1.28 mol of sulfuric acid (125.5 g) for 3 hours at 150° C. to 160° C. To the product (sulfonate) were added 44 g of water, and formalin (37% formaldehyde in water) in such amount as equal to 0.98 mol of formaldehyde dropwise over 3 hours at 90° C. The mixture was reacted for condensation for 10 hours at 100±2° C. The mixture was cooled to room temperature, neutralized to pH 5 with calcium hydroxide, and filtrated to remove generated precipitates (gypsum), resulting in an aqueous solution of a naphthalenesulfonic acid-formaldehyde condensate (B-1). The polymer was dried for 24 hours at 105° C. The aqueous solution was adjusted to an intended concentration to be used according to need.

Workup

  1. customThe mixture was reacted for condensation for 10 hours at 100±2° C
  2. filtrationfiltrated
  3. customto remove
  4. customgenerated precipitates (gypsum)

Sources & evidence

ORD record
ord-13f4d1c91db44bb7ae9a087b382960c9
Source dataset
uspto-grants-2015_05
Patent number
US09029444B2

Reaction notes

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