Organic Chemicals

Numerous hazardous wastes occur in organic chemical production facilities. In the production of acetaldehyde from ethylene, distillation bottoms (K009) and distillation side cuts (K010) are hazardous wastes. In acrylonitrile production, the bottom streams from the wastewater stripper (K011), the acetonitrile column (K013), and the acetonitrile purification column (K014) are hazardous wastes. In 1,1,1-trichlorethane production, hazardous wastes include spent catalyst from the hydrochlorinator reactor (K028), waste from the product steam stripper (K029), distillation bottoms (K095), and heavy ends from the heavy end column (K096).

In the production of toluenediamine via hydrogenation of dinitrotoluene, hazardous wastes are generated in reaction by-product water from the drying column (K112) and condensed liquid light ends (K113), vicinals (K114), and heavy ends (K115) from the purification of toluenediamine.

In the production of ethylene dibromide via bromina-tion of ethylene, hazardous wastes result from reactor vent gas scrubber wastewater (K117), spent adsorbent solids (K118), and still bottoms (K136) from purification.

Hazardous wastes are found in heavy ends or still bottoms from benzyl chloride distillation (K015), ethylene dichloride in ethylene dichloride production (K019), and vinyl chloride in vinyl chloride monomer production (K020). Heavy ends or distillation residues from carbon tetrachloride production (K016); the purification column in the production of epichlorohydrin (K017); the fractionation column in ethyl chloride production (K018); the production of phenol/acetone from cumene (K022); the production of phthalic anhydride from naphthalene (K024); the production of phthalic anhydride from ortho-xylene (K094); the production of nitro-benzene by the nitration of benzene (K025); the combined production of trichloroethylene and perchloroethylene (K030); the production of aniline (K083); and the production of chloroben-zenes (K085) are also hazardous wastes.

Other sources of hazardous wastes include distillation light ends from the production of phthalic anhydride from ortho-xylene (K093) or naphthalene (K024); aqueous spent antimony catalyst waste from fluoromethanes production (K021); stripping still tails from the production of methyl ethyl pyridines (K026); centrifuge and distillation residues from toluene diisocyanate production (K027); process residues from aniline extraction in aniline production (K103); combined wastewater streams generated from nitrobenzene/aniline production (K104); the separated aqueous stream from the reactor product washing step in the production of chlorobenzenes (K105); and the organic condensate from the solvent recovery column in the production of toluene diisocyanate via phosgenation of toluenediamine.

Was this article helpful?

0 0

Post a comment