INTERNATIONAL CLEANER PRODUCTION INFORMATION CLEARINGHOUSE

Case Study #256

1. Headline: Internal recycling at a French resin and

terpine manufacturer

2. Background: Les DÆrivÆs RÆsiniques et TerpÆniques (DRT)

carried out an environment audit on their production and

pollution removal units in 1992. The inventory and

characterization of the effluents led to the

implementation of a programme to decrease the COD

polluting flow by 30 %, within the framework of an

agreement with the River Agency, concerning the decrease

in effluents. This case study was carried out in 1992.

3. Cleaner Production Principle: Internal recycling

4. Description of Cleaner Production Application:

Information about the process and wastes

In the polyterpenes workshop a polymerization of alpha

pinene is carried out by means of aluminum chloride in

solvent phase. The process consists of washing with acid,

and discharging effluent, loaded with aluminum chloride,

oil, and hydrochloric acid, (about 2m3/h) into the sewer.

The company put in place :

--recycling waters so that they can be reused as a

flocculating agent in the treatment plant, and

--recycling the organic solution.

The decrease in discharges reaches 50 m3/d ; 28 tons of

oil are recovered a year and the COD load is decreased by

20 %.

The chlorinated water coming from the settling processes

can carry away an emulsified phase of resins and

chlorinated water. The settling tank breaks this emulsion

and enables the oily organic phase to be recovered.

Level of marketing

Material / energy balance and substitution

Recovery of 28 t/year of terpenic oil.

5. Economics:

Cost of direct investment

Settling tank 175 000

Equipment 237 000

Total 412 000 FF (1992)

6. Advantages: Besides the decrease in the pollution sent to

the treatment plant, this technology avoids a phenomenon

of anarchic flocculation in the collectors due to the

discharge of aluminum chloride. The organic phase is

recycled in the process.

7. Constraints: The chlorinated waters are acid and warm.

The equipment must be made of PVDF or PVC to prevent

corrosion.

8. Contacts:

Agence de l'Eau Adour-Garonne

M. GARIADOR

TEL: 33 61.36.37.38

M. LAGUIAN

In Charge of the Environment - DRT

Les DÆrivÆs RÆsiniques et TerpÆniques

40560 VIEILLE-SAINT-GIRONS - France

TEL: 33 58.47.95.95

FAX: 33 58.47.95.50

M. Maton

M. Chatenet

Office International de l'Eau

Direction de la Formation et des Etudes

rue Edouard Chamberland

87065 Limoges Cedex, France

TEL: 33 55114770

FAX: 33 55777115

9. Keywords: France, aluminium chloride, oil, hydrochloric,

ISIC 3515, chemical, terpene, recycling, COD, chlorine,

acid

10. This case study was submitted to UNEP IE in 1994 by the

French Office International de l'Eau. It has not undergone

a formal technical review.