Chloropicrin

CAS RN:76-06-2

Disposal Methods

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

The following scheme is proposed for treating effluents from the production of chloropicrin. These wastewaters contain Ca(ClO)2 approx 2000 mg/l, chloropicrin approx 80 mg/L, and picric acid approx 80 mg/L. The Ca(ClO)2 is first removed by reduction with FeSO4 at 90-95 deg, and pH of 11-11.5. Complete removal is achieved in 3 hours. The nitro compounds are then reduced to MeNH2 and triaminophenol by heating the effluent from the first stage with FeSO4 and Fe turnings at 90-95 deg. Reduction of the nitro compounds is approx 81% complete, the residue containing compounds are not readily reduced. The MeNH2 vapor is oxidized to MeOH in a reactor containing a soln of NaNO2 and HCl at 5-6 deg. The reaction time is 2-2.5 hours. The MeOH and triaminophenol are then oxidized with Ca(ClO)2, and the final treated effluent is clearified before discharge.

Chloropicrin reacts readily with alcoholic sodium sulfite soln to produce methanetrisulfonic acid (which is relatively non volatile and less harmful). This reaction has been recommended for treating spills and cleaning equipment. Although not specifically suggested as a decontamination procedure, the rapid reaction of chloropicrin with ammonia to produce guanidine (LD50= 500) could be used for detoxication. The Manufacturing Chemists Association suggest two procedures for disposal of chloropicrin: 1) Pour or sift over soda ash. Mix and wash slowly into large tank. 2) Adsorb on vermiculite. Mix and shovel into paper boxes. Drop into incinerator with afterburner and scrubber. Recommendable methods: Neutralization, & incineration.

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