Method for recycling rubber-containing wastes

Abstract

The inventive method includes thermal liquefaction of wastes in an organic solvent at a temperature above 270° C. and a pressure up to 6 MPa. The liquid fraction is separated from the undissolved product. The liquid fraction is distilled into the fraction with the boiling temperature below 220° C. and the fraction with the boiling temperature above 220° C. Alkyl benzene or the gasoline fraction with a boiling temperature below 220° C. is used as an organic solvent at the start-up of the process. Thermal liquefaction of a batch of wastes is carried out in an organic solvent at a temperature from 280° C. to 435° C. and a pressure at least 2.9 MPa, the organic solvent-waste weight ratio being more than 1.0. The liquid fraction with the boiling temperature below 220° C. is subjected to catalytic reforming. A part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as the target product, and the remaining part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as a solvent and returned for thermal liquefaction of a new batch of wastes at a temperature from 280° C. to 435° C. and a pressure at least 2.9 MPa, the solvent-waste weight ratio being more than 1.0. The process of thermal liquefaction is continued in the said conditions of thermal liquefaction and catalytic reforming for the next and subsequent batches of wastes, while a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. being returned for thermal liquefaction.

1 . A method for recycling rubber-containing wastes, including thermal liquefaction of wastes fed into a reactor containing an organic solvent at a temperature above 270° C. and a pressure up to 6 MPa, separation the liquid fraction from the undissolved product, distillation of the liquid fraction into the fraction with the boiling temperature below 220° C. and the fraction with the boiling temperature above 220° C., characterized in that after feeding in a reactor a batch of wastes and an organic solvent thermal liquefaction is carried out at a temperature from 280° C. to 435° C. and a pressure at least 2.9 MPa, the organic solvent-waste weight ratio being more than 1.0, the liquid fraction with the boiling temperature below 220° C. is subjected to catalytic reforming, a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as the target product, and the remaining part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as a solvent and returned for thermal liquefaction of a new batch of wastes at a temperature of from 280° C. to 435° C. and a pressure at least 2.9 MPa, the solvent-waste weight ratio being more than 1.0, the liquid fraction, as obtained from the new batch of wastes, with the boiling temperature below 220° C. is subjected to catalytic reforming, a part of the liquid fraction from the new batch of wastes, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as the target product, and the remaining part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is used as a solvent and once again returned for thermal liquefaction of a new batch of wastes, the process is continued in the said conditions of thermal liquefaction and catalytic reforming for the next and subsequent batches of wastes, while a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. being once again returned for thermal liquefaction of subsequent batches of wastes.  
   
   
       2 . The method according to  claim 1 , characterized in that at the start-up alkyl benzene and/or the gasoline fraction having a boiling temperature below 220° C. is used as an organic solvent.  
   
   
       3 . The method according to  claim 1 , characterized in that a part of the liquid fraction, as subjected to catalytic reforming, with the boiling temperature below 220° C. is returned for thermal liquefaction of a new batch of wastes at a pressure in the range from at least 2.9 MPa to not more than 5 MPa, the solvent-waste weight ratio being in the range from more than 1.0 to not more than 3.0.