Claims
- 1. A process for treating an aqueous drilling mud effluent, containing minerals and lignosulfonates, to remove the lignosulfonates, comprising the steps of:
- (a) adding sulfuric acid to said aqueous effluent to cause coagulation,
- (b) mixing the sulfuric acid with said effluent while controlling the mean pH of the effluent/sulfuric acid mixture to a pH between 5-6,
- (c) flocculating the aqueous effluent containing sulfuric acid at said pH by adding thereto a cationic polyelectrolyte water soluble polymer comprised of at least 40% of monomer units containing at least on quaternary ammonium group wherein said monomer unit has the formula: ##STR5## wherein X i O or N, R is H or CH.sub.3, M is a quaternary ammonium group of the formula:
- --CH.sub.2 --CH.sub.2 --N.sup.30 R.sub.1 R.sub.2 R.sub.3 A.sup.-
- wherein A is an anion compatible with said quaternary ammonium group, and R.sub.1, R.sub.2 and R.sub.3 are C.sub.1-4 hydrocarbon groups, to form a liquid phase and a solid phase, and
- (d) mechanically separating the liquid phase and solid phase.
- 2. The process of claim 1, wherein said polymer further comprises monomers of the formula: ##STR6##
- 3. The process of claim 1, wherein said anion is selected from the group consisting of Cl.sup.-, Br.sup.- and CH.sub.3 SO.sub.4.sup.-.
- 4. The process of claim 1, wherein R.sub.1, R.sub.2 and R.sub.3 are C.sub.1-4 alkyl groups.
- 5. The process of claim 1, wherein M is the group CH.sub.2 CH.sub.2 N(CH.sub.3).sub.3.sup.+ Cl.sup.-.
Priority Claims (1)
Number |
Date |
Country |
Kind |
87 04271 |
Mar 1987 |
FRX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/294,691, filed as PCT/FR88/00154, Mar. 24, 1988, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
1012265 |
Jun 1977 |
CAX |
54-113954 |
Feb 1978 |
JPX |
63-267408 |
Apr 1987 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
294691 |
Nov 1988 |
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